aussie7mains":3hme5agg said:
Do you need an intercooler, if your under about 100kPa boost and your supercharger is fairly efficient adiabaticly then you shouldnt need one, particularly in Minesota, its cold there isnt it? And as to a Bov I think that a bit of unneccesary romance as well.
If you want throttle responce then keep all you plumbing to a minimum, thus no IC, there fairly expense too and given that your only on full noise for a few seconds why have it.
Dont just go with whats fashionable by the Skyline boys, most of them know nothing, your 300 isnt likely to rev much either so you have to fatten out the lower rpm, which is where the most impressive results are.
Its going in the truck after all!
A7m
I asked that question here and the answer everyone seem to tell me was yes. To tell you the truth I have no idea how much 100 kPa is.
I was shooting for 7-10 pounds of boost but depending on the pulley I run it could be as high as 12-14 pounds.
It's only cold in Minnesota 6 months out of the year.
Our temps around here can range from -20 F to + 100 F.
But I will also be running multiport fuel injection with E85 which has a 105 octane rating and also acts like a chemical intercooler.
I've got a very aggressive driving style. I'm on the gas alot! And I also tow some very heavy loads. so the throttle is going to get used.
I don't really think I need an intercooler. But I'd rather spend the money now and be safe instead of finding out later that I should have ran one.
I could care less what the import guys do. And I could care less what the intercooler looks like ( It most likely won't be seen anyways ) . I just want my engine to live. So if an intercooler will cut down the chance of detonation then I'll run one.
It's going to see a max of 5500 rpms. which isn't a lot for a import but it's quite a bit for a 300. And with the gearing my truck has I'm not concerned about the low end nearly as much as I am the mid range and top end. At 70 mph my engine will be turning over 3000 rpm.
This may be a truck but I drive my trucks like they are Mustangs.
XPC66":3hme5agg said:
The plenum is important. It's there to cushion the air, for static regain, to stop scavaging between runners, etc. It should ideally be tapered for regain, it should have an overhang on the dead end and a spigot between it and the throtlle body.
To ballpark size you will need:
Intake opening (advertised)
Intake closing (adv)
Exhaust opening (adv)
Exhaust closing (adv)
Exhaust port area
Intake port area
Boost pressure
Preferred RPM
Bore and stroke
Compression ratio
If intercooled
That is the plenum design I had read about and was planning on making. As for the rest of the info it looks like I should have got a mathmatics degree.
I take it you are refering to the cam/valve timing for the Intake and exhaust opening and closing?
So it looks like the intake will have to be the last part of the engine I build.
inline300":3hme5agg said:
Talk about confuse some folks.
Use the OE efi manifold, mount a roots blower to it, then it would protrude from the center of the hood, giving folks the impression its a v8 but wonder why na hell does it sound like that.
This is my reason for this post. Everywhere I looked I was getting a different answer.
I'm going to use the stock EFI lower intake but I'm making my own upper intake. I'm running an Eaton not a roots blower. And with my cab body lift and the bubble hood there is no way anything mounted on the engine would stick thru the hood.
