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Search found 654 matches

by AbandonedBronco
Thu Feb 13, 2020 6:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Preventing detonation and selecting spark plugs
Replies: 5
Views: 731

Re: Preventing detonation and selecting spark plugs

Any further developments? On this engine?. I'm deeply intrigued by this, and look forward to whenu finally nail down a cause . It's a most peculiar circumstance I really don't think I'll ever know what happened. And honestly, at this point, I sincerely don't want to find out, because the only way f...
by AbandonedBronco
Tue Feb 11, 2020 12:12 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Preventing detonation and selecting spark plugs
Replies: 5
Views: 731

Re: Preventing detonation and selecting spark plugs

On a stock build I start with 1 range colder and on a mild build up with 2 ranges colder plugs and work from there. This is based on the engines use of mostly higher speed operation on the freeway / hyway etc. How much timing were you runing for base, and total timing? Good luck :thumbup: :nod: Tha...
by AbandonedBronco
Mon Feb 10, 2020 5:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Preventing detonation and selecting spark plugs
Replies: 5
Views: 731

Preventing detonation and selecting spark plugs

Hi all, I posted this over on FTE but thought I would here, as this site is a bit more performance oriented. As the title says, I'm trying to figure out spark plugs for my engine, as well as other ideas for preventing detonation. As some of you know, my engine got ruined. It somehow experienced deto...
by AbandonedBronco
Wed Dec 18, 2019 2:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 1 piece oil pan gasket always leaks
Replies: 8
Views: 858

Re: 1 piece oil pan gasket always leaks

I have the same gasket and I believe the same leak. Need to clean the block and check since I had my gauge feed line break and spew oil everywhere on the way to moab. You may recall I had an issue with the felpro valve cover gasket made of the same material. Once it got oil on it from test fitting,...
by AbandonedBronco
Thu Dec 12, 2019 12:37 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 1 piece oil pan gasket always leaks
Replies: 8
Views: 858

1 piece oil pan gasket always leaks

Hi all, So, I have an unfortunate upcoming project where the engine needs to be pulled and disassembled. As such, I'll be putting on a new oil pan gasket when it goes back together. The issue is that I've installed numerous Fel-Pro 1 piece silicone gaskets on about 4 different 300s and they have ALL...
by AbandonedBronco
Mon Dec 09, 2019 5:03 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Re: Engine doesn't like a lot of timing.

Makes sense. I was looking at the Sniper software, and it was a cakewalk to set up the input to respond to a custom voltage signal, and perform actions like lower the timing, etc. However, I'd have to upgrade my Sniper ECU to support it. So that idea's out. However, I've been doing some reading and ...
by AbandonedBronco
Fri Dec 06, 2019 3:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Re: Engine doesn't like a lot of timing.

Please show where the Holley Sniper EFI system can take a direct knock sensor input signal and do something with it. On second look, it appears that only the Super Sniper can do that. Bummer. But, it comes with 3 input wires which can be configured. Basically, just showing between 1 and 5 volts. No...
by AbandonedBronco
Fri Dec 06, 2019 1:17 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Re: Engine doesn't like a lot of timing.

I was asking about that a little while back on the Sniper forum. The 4.9 does come with a knock sensor in later years (although it seems to be quite difficult to find anyone who makes a replacement). The Sniper has custom inputs that I can record and display on the data logging. I was wondering if I...
by AbandonedBronco
Fri Dec 06, 2019 12:48 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Re: Engine doesn't like a lot of timing.

I think part of the problem I'm facing is I just don't know if what I'm hearing is spark knock / pinging. I've been looking at YouTube videos for about an hour, and 99% of them are only explaining what detonation / pre-ignition is, but not what it sounds like or how to know if you're experiencing it...
by AbandonedBronco
Thu Dec 05, 2019 2:10 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Re: Engine doesn't like a lot of timing.

Very interesting info. That makes sense, too. Yes, the Sniper system comes with a wideband, and I can see the readout on my handheld display, which I have mounted on the dash. https://www.supermotors.net/getfile/1146982/fullsize/20190325-08.05.35.jpg https://www.supermotors.net/getfile/1149209/fulls...
by AbandonedBronco
Thu Dec 05, 2019 1:12 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Re: Engine doesn't like a lot of timing.

I know you have done this before but would you just one more time verify that the TDC timing mark is actually TDC with the piston location. Yeah, this one keeps going through my head too. It seems like the timing mark is off. However, recently, when I converted to computer controlled timing, I line...
by AbandonedBronco
Thu Dec 05, 2019 12:03 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Re: Engine doesn't like a lot of timing.

I can only throw in my experiences, since we have a similar engine. My compression is higher, but my cam is a touch smaller. 9.75 SCR, schneider 140h cam, 15cc step dish pistons, and larger valves. I ran 89 octane all the way to moab without pinging. I have the DUI dizzy, but just the generic 300 t...
by AbandonedBronco
Tue Dec 03, 2019 5:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Re: Engine doesn't like a lot of timing.

Thanks for the answer. I'm curious why the curve that DUI created for me wouldn't be correct (and would cause enough detonation to cause engine damage). They built it off of my cam specs, vehicle weight, compression ratio, etc. It's what they do for a living so I would have figured it would at least...
by AbandonedBronco
Tue Dec 03, 2019 1:10 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine doesn't like a lot of timing.
Replies: 25
Views: 1472

Engine doesn't like a lot of timing.

Hi all, So, recently it came to my attention that I have engine damage due to detonation. I will be pulling the engine apart here in a month or so to replace the pistons, rings, connecting rod bearings, rehone, etc. to repair the damage. To keep this from happening again, I'm looking into why . I ha...
by AbandonedBronco
Mon Nov 04, 2019 4:01 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3750

Re: How to add computer controlled timing

Alright, well, I was successful! I locked out the HEI, and switch the system over to magnetic pickup and away it went. The adjustment knob mentioned in the video was phenomenal for phasing it. https://www.amazon.com/gp/product/B01N7W8XJB/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 I would s...
by AbandonedBronco
Fri Nov 01, 2019 2:49 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3750

Re: How to add computer controlled timing

I agree on both accounts. It's very cool info, but it's information overload without any clear direction. It's what I addressed in my first post. Everything I read is just clues on how to progress. More puzzle pieces that you have have to figure out how they go together. Much appreciated, but it did...
by AbandonedBronco
Thu Oct 31, 2019 2:14 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3750

Re: How to add computer controlled timing

Fortunately, as far as magnetic pickup distributors go, there are a good number of options that can be set, and configured, to clean out the noise.
by AbandonedBronco
Wed Oct 30, 2019 7:23 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3750

Re: How to add computer controlled timing

Thanks for all of the input everyone. It seems that at this point, going with the TFI is just too complicated for my time frame. I know I could, but I don't have the time to figure out schematics, sensors, triggers, etc. and try to put all of the puzzle pieces together. Maybe if it was a project car...
by AbandonedBronco
Tue Oct 29, 2019 11:28 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3750

Re: How to add computer controlled timing

Wesman07 wrote:What is the issue with using TFI?


I can't find any solid info on how to do it or connect it to the Sniper system.
Holley tech said it's not a simple idea, and the one write up I found on it (which was missing important info) was a really complex experiment.
by AbandonedBronco
Tue Oct 29, 2019 5:14 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3750

Re: How to add computer controlled timing

That approach in the video really does look great. I'm going to give it a try. I have the coil driver, so it looks like it's only about $60 in parts total. Not too bad. Overall, it looked like a simple setup. As mentioned in the video, I swapped out the advance lockout plate for this: https://www.am...
by AbandonedBronco
Tue Oct 29, 2019 3:16 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3750

Re: How to add computer controlled timing

Very cool info, thank you. I agree, most everything is for GM. Plus, if it is for Ford, it's more than likely not going to include the 300... I find it annoying for Holley to brag and tout their Plug-and-Play Sniper compatible ignition systems, but always fail to mention it only works with about 5 -...
by AbandonedBronco
Tue Oct 29, 2019 2:26 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

So, continuing this discussion in another forum as far as the timing control goes:
Would you mind taking a look and weighing in?

viewtopic.php?f=51&t=80462


I'll update this post later as I get the engine pulled apart.
by AbandonedBronco
Tue Oct 29, 2019 2:25 pm
Forum: Fuel Injection - Mega Squirt
Topic: How to add computer controlled timing
Replies: 22
Views: 3750

How to add computer controlled timing

Hi all, I'm working on my '85 Bronco with a 300 I6. It has a Holley Sniper EFI system. Currently it has an aftermarket DUI ignition from PerformanceDistributors. However, I want to go with computer timing control using the Sniper system. It seems the more research I do on this, all I get are "c...
by AbandonedBronco
Fri Oct 25, 2019 8:04 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Agreed. That's what I'm chalking it up to. It's my first performance engine. I'll get it running right again. And it could have been worse. I agree on the pistons. Hopefully it doesn't come to that. I also still have 2 pistons left over from buying an 8 pack, and it'd be nice to reuse them. From wha...
by AbandonedBronco
Fri Oct 25, 2019 6:50 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

The hall effect setup might work even better.
I'm wondering if that's something that could be mixed with the MSD.

Either way, I'll get some pistons, gaskets, etc. on order and plan for this.
What's done is done, just need to fix it and keep it from happening again.
by AbandonedBronco
Fri Oct 25, 2019 5:20 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Thanks for the ideas. By only for V8s, I'm meaning an aftermarket distributor (not the actual Sniper itself). If I can find a compatible distributor that I can somehow set up timing control with, the Sniper will happily accept a 6cyl setup. I just don't know which distributor I can use, which is why...
by AbandonedBronco
Fri Oct 25, 2019 2:46 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Cruise is right around 8 - 10hg and 2250 RPMs. So, maybe 30 - 35 total timing. The areas above 40 or so are areas that are pretty hard to get into, unless I'm free revving it. Personally, I'd really like to go with computer timing control with my Sniper unit so I can simply dial these numbers in by ...
by AbandonedBronco
Fri Oct 25, 2019 12:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Where does the timing go when the engine is above 4500 rpm? What units of measure is the 0-14 vacuum scale using. inches, psi ? What octane gas do you use? The timing stops mechanically increasing at 2750, so it's the same at that RPM and up. Vacuum advance stops increasing at 13, so it's the same ...
by AbandonedBronco
Fri Oct 25, 2019 11:09 am
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Well... that sucks. I'd much rather some valves and head work. :bang: This is my timing curve. They said that it wasn't modified much, if any, from their base curve. The "Vacuum" column is for the vacuum advance, as it increases across to the right. https://www.supermotors.net/getfile/1154...
by AbandonedBronco
Thu Oct 24, 2019 7:53 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Thanks for all the replies everyone. I wanted to do a leak down test before I responded. First, in response to some comments above. The PCV system seems to be working just fine. It has plenty of vacuum through the valve. The engine built was done in phases over a year as funds provided. But each seg...
by AbandonedBronco
Thu Oct 17, 2019 6:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Gotcha, that makes sense. Yes, it has a PCV valve installed that pulls vacuum from the large port on the base plate. Then, there's a filter in the cap on the other end of the cover. I know the gunk you're talking about and have never seen it on this engine. I'll drain a little oil and look for parti...
by AbandonedBronco
Thu Oct 17, 2019 6:06 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Can you explain how the PVC system would cause that? Not understanding that one.
by AbandonedBronco
Thu Oct 17, 2019 5:45 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

And... how much oil does it use? I would think bad ring seal across the board would show up as increased oil consumption. I bought one of those cheap USB cameras just for mysteries like this. With one you can peek at pistons and cylinder walls... It doesn't use a lot. It's not like I'm topping it o...
by AbandonedBronco
Thu Oct 17, 2019 4:37 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Well, honestly, the whole thing seems unlikely! :lol: All six cylinders have valve sealing issues at the same time seems unlikely to me as well. More unlikely to me than having a bad batch of rings that all wore out exponentially fast. Then again, I'm no expert. I'm at a loss overall. I didn't measu...
by AbandonedBronco
Thu Oct 17, 2019 3:39 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Re: Loss of compression in all cylinders

Wouldn't the boost in compression with the addition of oil be automatically indicative of rings? I thought that was pretty much a given.


I could do a leak down test, but it would take some time, since I don't have direct access to any of the necessary tools or equipment.
by AbandonedBronco
Thu Oct 17, 2019 12:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Loss of compression in all cylinders
Replies: 43
Views: 3452

Loss of compression in all cylinders

Hi all, I posted this up over on ford-trucks, but thought I'd share it here to see what some of the gurus think. For some history, two years ago I had my engine rebuilt by a professional engine builder who specializes in racing engines. The build took about a year, and was very meticulously done wit...
by AbandonedBronco
Wed Oct 16, 2019 11:48 am
Forum: Fuel Injection - Mega Squirt
Topic: Converting a high performance 300 to fuel injection
Replies: 25
Views: 9471

Re: Converting a high performance 300 to fuel injection

No worries, thanks for the response! It mirrors everything I've learned since I asked the question. :D I actually installed a 3G alternator last month. My alternator died for the umpteenth time and I realized that I had simply been overtaxing them and burning them up. The voltage reading on my Snipe...
by AbandonedBronco
Fri Sep 13, 2019 3:09 pm
Forum: Fuel Injection - Mega Squirt
Topic: 2 barrel on a one barrel adapter
Replies: 12
Views: 2872

Re: 2 barrel on a one barrel adapter

I have a Sniper 2300 on my 300 and I would not use the stock log manifold. I have an Offenhauser C on mine, and it fits really nicely. https://www.supermotors.net/getfile/1139643/fullsize/20180908-18.21.051.jpg https://www.supermotors.net/getfile/1139646/fullsize/20180909-10.15.18.jpg It seems like ...
by AbandonedBronco
Tue Aug 13, 2019 4:53 pm
Forum: Fuel Injection - Mega Squirt
Topic: Anyone here successfully running an aftermarket EFI System, Megasquirt, Holley Hp, Sniper, Atomic, FITech?
Replies: 22
Views: 5132

Re: Anyone here successfully running an aftermarket EFI System, Megasquirt, Holley Hp, Sniper, Atomic, FITech?

On the Sniper, the fuel table is already set up. You enter in your engine's specs, and it'll create a fuel map that's "close" and will at least get you driving. Then, there's the AFR map. This is a basic map that tells the computer what Air/Fuel ratio you want it to shoot for at a specific...
by AbandonedBronco
Tue Aug 13, 2019 10:29 am
Forum: 240-300 "Big Block" Six Performance
Topic: Two belts on alternator with a Saginaw Pump?
Replies: 18
Views: 1530

Re: Two belts on alternator with a Saginaw Pump?

I would think that if you have no issues with your steering, you might as well leave it as is. I would think you'd notice if it was "weak" with your 37" tires.

Less RPMs means your pump will last longer! :P
by AbandonedBronco
Fri Aug 09, 2019 9:38 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Two belts on alternator with a Saginaw Pump?
Replies: 18
Views: 1530

Re: Two belts on alternator with a Saginaw Pump?

It's hooked up exactly how yours is.

The smaller groove on the water pump pulley is powering the AC.

However, it looks like your water pump pulley front groove is a LOT smaller than mine. Mine is about 90% the diameter of the other two. Yours looks almost 50 - 60%.
by AbandonedBronco
Fri Aug 09, 2019 1:03 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Two belts on alternator with a Saginaw Pump?
Replies: 18
Views: 1530

Re: Two belts on alternator with a Saginaw Pump?

Okay, for some reason, I was not getting notified that I was getting replies on this post. Sorry for being a no show! I'll have to check my settings. So, to clarify, the issue is that I have 3 grooves on the harmonic balancer and 3 on the water pump. The alternator, now, with its 2 groove v-belt sit...
by AbandonedBronco
Tue Aug 06, 2019 6:06 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Two belts on alternator with a Saginaw Pump?
Replies: 18
Views: 1530

Two belts on alternator with a Saginaw Pump?

Hi all, Recently, and for the fourth or fifth time, my alternator died. After doing some research, I finally realized that my stock charging system just doesn't have the amperage for all of the goodies I've installed over the years. So, I went to the junk yard last weekend and found a 3G alternator ...
by AbandonedBronco
Mon Jun 10, 2019 5:25 pm
Forum: Fuel Injection - Mega Squirt
Topic: Anyone here successfully running an aftermarket EFI System, Megasquirt, Holley Hp, Sniper, Atomic, FITech?
Replies: 22
Views: 5132

Re: Anyone here successfully running an aftermarket EFI System, Megasquirt, Holley Hp, Sniper, Atomic, FITech?

Do you have any more pictures of the install? I do. Lots more. Here's some of the highlights. https://www.supermotors.net/getfile/1139643/fullsize/20180908-18.21.051.jpg https://www.supermotors.net/getfile/1139646/fullsize/20180909-10.15.18.jpg https://www.supermotors.net/getfile/1139647/fullsize/2...
by AbandonedBronco
Thu Apr 11, 2019 11:15 am
Forum: 240-300 "Big Block" Six Performance
Topic: Offenhouser Source
Replies: 3
Views: 751

Re: Offenhouser Source

Both of those are something that I'd love to have. I've never been the biggest fan of the stock valve cover, due to how easily the bolt holes distort (too thin of metal), so hopefully it's a bit thicker. A side cover would be nice too. Those are really good prices on the intakes. They've jumped up i...
by AbandonedBronco
Mon Apr 08, 2019 5:36 pm
Forum: Fuel Injection - Mega Squirt
Topic: Anyone here successfully running an aftermarket EFI System, Megasquirt, Holley Hp, Sniper, Atomic, FITech?
Replies: 22
Views: 5132

Re: Anyone here successfully running an aftermarket EFI System, Megasquirt, Holley Hp, Sniper, Atomic, FITech?

Yes, I have a Holley Sniper 850-550 on my 300. https://www.supermotors.net/getfile/1140045/fullsize/20180916-13.05.06.jpg I'd had a 4bbl carb on it for years, so I wavered back and forth between going with the 4bbl Sniper or the 2bbl Sniper, but was then advised by both forum members, and Holley, to...
by AbandonedBronco
Mon Nov 05, 2018 11:05 am
Forum: Fuel Injection - Mega Squirt
Topic: MAP sensor reading vs. engine vacuum
Replies: 8
Views: 3534

Re: MAP sensor reading vs. engine vacuum

It is one of the cars I helped put together. 430 cu in SBF with twin 88s, 24 injectors on methanol, 2400 hp. You can't see the engine for all of the bolt-on stuff https://www.dropbox.com/s/4rz3c5rqf70si0b/49fordEngine2.JPG?dl=0 Here is my control center sitting over the intercooler on the passenger...
by AbandonedBronco
Wed Oct 31, 2018 12:36 pm
Forum: Fuel Injection - Mega Squirt
Topic: MAP sensor reading vs. engine vacuum
Replies: 8
Views: 3534

Re: MAP sensor reading vs. engine vacuum

Hey, that landscape looks familiar! Yes, driven by Firebird many times on our way out to Emmett for car shows. My dad has some 50's classics he likes to share. That 49 scoots!!! Wow. Is that one of yours? And yeah, it's like the water park here on a weekday. Once you go down a slide, you just turn a...
by AbandonedBronco
Wed Oct 31, 2018 11:18 am
Forum: Fuel Injection - Mega Squirt
Topic: MAP sensor reading vs. engine vacuum
Replies: 8
Views: 3534

Re: MAP sensor reading vs. engine vacuum

Thanks for the info pmuller. I figured both were just intake pressure (or lack thereof) and should directly correlate. When I first turn my key to "on", the MAP reads 94kPa, which is very close to what you listed? Where did you get that info? While I was looking around online yesterday, al...
by AbandonedBronco
Tue Oct 30, 2018 11:07 am
Forum: Fuel Injection - Mega Squirt
Topic: MAP sensor reading vs. engine vacuum
Replies: 8
Views: 3534

MAP sensor reading vs. engine vacuum

Hi all, Still getting used to the nuances of the Holley Sniper I have installed (love it so far). However, one thing I have some curiosities about. Holley documentation states the conversion between the pressure that the MAP sensor reads (kPa) and the vacuum gauge reading (hg). 100 kPa = 0 hg 75 kPa...

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