Increasing boost.

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George66Falcon
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Increasing boost.

Post #1 by George66Falcon » Tue May 16, 2017 9:06 pm

Hey there folks, I've got a 200 with an m62 blowing through a holley sniper efi system, and I'd like to get a little more boost. Currently, I'm running 7~ lbs (I'm pretty sure my bypass valves never fully close, though, so it might be a bit more after some adjustments). I'd like to get up to 12 or so. The problem is that I don't really want to go much smaller on the supercharger pulley than the ~2.5" double vbelt pulley I currently have. Are there any harmonic balancers that will interchange from larger ford inline motors? My current one is stock, ~6". I see that 300's come with up to 9" balancers! Anything that I can use?



67Straightsix
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Re: Increasing boost.

Post #2 by 67Straightsix » Tue May 16, 2017 10:47 pm

Sounds like a nice set up, have any pictures ? You need to be careful about the harmonic balancer if you go much bigger in diameter it will interfere with the water pump pulley. Are you using the same belt to run blower, alt, and water pump?



pmuller9
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Re: Increasing boost.

Post #3 by pmuller9 » Wed May 17, 2017 12:16 am

The M62 should not be run past 14,000 rpm.
I think you would be pushing it past it's limit if the drive ratio was set up for 12 lbs of boost

You may need to look for a M90.



George66Falcon
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Re: Increasing boost.

Post #4 by George66Falcon » Wed May 17, 2017 1:41 am

Here's a couple of pictures of what I've set up. Different and undoubtedly worse than what most others have done ( I was restricted to working on the side of the road with only a drill for a power tool when I built everything initially, and haven't really been willing to rework it all). I understand some things will need to change to safely run more boost, an intercooler specifically. The water pump pulley has an additional pulley bolted over the top of it from a 302 that's slightly larger. This 2v pulley drives a modified alternator pulley on the supercharger that is 2 5/8".

I'm happy to hear feedback, whatever it may be.



Image

Image



pmuller9
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Re: Increasing boost.

Post #5 by pmuller9 » Thu May 18, 2017 1:06 am

Clean looking set-up! Not bad for a hand tool fabrication project.

In order to get 12 lbs of boost from the M62, it would need a drive ratio of 3:1
That would require an 7 7/8" crank pulley with the 2 5/8" supercharger pulley.
The M62 14K max rpm would restrict the engine rpm to about 4800 rpm and the supercharger would run very hot at those limits.

A M90 would only need a drive ratio of 2:1 to get 12 lbs of boost.
The M90 12K max rpm would allow the engine to operate up to 6000 rpm.
It would run much cooler just below 5000 rpm than the M62.



67Straightsix
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Re: Increasing boost.

Post #6 by 67Straightsix » Fri May 19, 2017 11:53 pm

Looks good. :thumbup:



George66Falcon
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Re: Increasing boost.

Post #7 by George66Falcon » Sun May 21, 2017 3:58 am

Thanks for the info, folks. It sounds like my best bet is to either swap to an m90, or make sure everything is sealed nice and tight to make the most of what I've got.



1Bad71
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Re: Increasing boost.

Post #8 by 1Bad71 » Wed Jun 07, 2017 10:07 pm

Can we see more pics of how you have that mounted?


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George66Falcon
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Re: Increasing boost.

Post #9 by George66Falcon » Wed Jun 21, 2017 4:58 pm

Two swedged tubes up front connect to one of the thermostat housing bolts and from the opposite side of the alternator bolt. On the back a plain mild steel bracket goes from the supercharger inlet to an intake manifold bolt. It's basically cinched down tight to the head and valve cover. I've had it off a few times and haven't seen any evidence of wear to the head, vc, or supercharger on the final iteration.

Image

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xctasy
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Re: Increasing boost.

Post #10 by xctasy » Sat Jul 08, 2017 1:49 am

Nice workmanship! Good stuff like this produces results, even if its a small supercharger in the "Grand Scheme of Things".

pmuller9 wrote:The M62 should not be run past 14,000 rpm.
I think you would be pushing it past it's limit if the drive ratio was set up for 12 lbs of boost

You may need to look for a M90.



Even an M90 is limited.

viewtopic.php?t=56560

Dyno runs on C4 autos normally have a 1.5 rwhp to flywheel net hp figure due to torque converter to counterweight matters on all dynos.

A manual, the total loss is 1.26 or so. On a drag strip, the losses are a lot less in some cases due to the manner in which the weight of the flywheel or the action of a transbraked C4 can slingshot a care, sometime 1.14 to 1.18. Some electric dynos to a full parastic check, and got a 1.314 figure, like long time member 80stang

Image


http://www.ponikorjaamo.com/ti80/index_inline.htm


His Gen I engine was like that, 1.314 drive train loss from 109 to 83.1 rwhp

http://www.ponikorjaamo.com/ti80/gen1.htm

Image

Going back to balldrick's M 90 supercharged 250 back in 2009

303 flywheel net hp from a 203 rwhp dyno run is all an M90 can really be expected to do if its really well sorted.

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Last edited by xctasy on Sat Jul 22, 2017 2:42 am, edited 1 time in total.


Image
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George66Falcon
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Re: Increasing boost.

Post #11 by George66Falcon » Sat Jul 22, 2017 2:11 am

Thanks, folks, I really appreciate the feedback.

I did find a large Chevy water pump pulley that let me play with the ratios a bit more, so I'm now sitting at just under 9lbs of boost. Everything I've read has led me to believe that it isn't the boost the kills our motors, it's over revving. I have a used gear vendors unit that I'll be installing soon, so my plan is to keep it under 4500 rpm (puts the blower just over manufacturer reccommended rpm at redline) with the gv splitting gears.



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