turbo wiht high compression?

speedyrb29 · Post by **speedyrb29** » Sun Jul 09, 2006 8:09 pm

im just curious as to what would happen if you ran a stock srt setup on an engine that has 10.5.1 compresiob pistions with a bigger cam? would it jjust blow up or could it be possible at low psi?

eastwoodsn352 · Post by **eastwoodsn352** » Sun Jul 09, 2006 8:10 pm

10.5:1 is pretty low...i think...should be ok for small amounts of boost.

speedyrb29 · Post by **speedyrb29** » Sun Jul 09, 2006 8:12 pm

i was just woundering because i know turbo pistions are like 8.5.1? or somthin like that

03blackrt · Post by **03blackrt** » Sun Jul 09, 2006 8:59 pm

turbo + high comp = not good , 10.5 is way to high comp for a turbo.

INVUJerry · Post by **INVUJerry** » Sun Jul 09, 2006 9:30 pm

well, I think if you use a high comp, but a huge cam (like a 16), it might lower cylinder pressure enough for it to go?

fixitmattman · Post by **fixitmattman** » Sun Jul 09, 2006 10:09 pm

You can run a turbo with any compression ratio you like, however you need to be fully aware of what running 8 psi on 10:1 will get you vs stock 9:1, or turbo 8:1 pistons, as well as the effect compression ratio will have on turbo sizing.

Given that this post was made in the first place, I would suggest not putting a turbo on your 10.5:1 engine. If you really want a turbo on the engine how it sits, seek professional advice.

Matt

speedyrb29 · Post by **speedyrb29** » Mon Jul 10, 2006 12:32 am

as far as the cams go its a crance came #22. i was just asking this queastion because im building and engine and plan on going 10.5:1 compression and just wanted to know if in the future if i could bolt on a stock srt setup and run maybe 5 psi.

Young Gunna · Post by **Young Gunna** » Mon Jul 10, 2006 1:40 am

you can boost at any compression, BUT the key is tuning, if not tuned properly even an 8.5 can blow

Anonymous User · Post by **Anonymous User** » Mon Jul 10, 2006 1:50 am

the only things wrong with turbo on a high comp engine. is the higher comp. paired with boost the more you limit your chances to make power on pump gas, and the window for detonation becomes bigger which makes it more of a risk to blow your engine vs. what would ocurr with a lower comp. engine.

unsuper man · Post by **unsuper man** » Mon Jul 10, 2006 9:19 pm

ever see really fast turbo or s/c cars? theyre HIGH HIGH compression motors.

if you under stamd wht forced induction is doing, it makes sense. all "boost" is doing is momentaryily raising cyclider pressure. or the compression ratio. now if u have an ALREADY high comp, you get faster spool times, better off boost response, and more in boost power. but your tuning window is much smaller. not so small that u cant make it work tho. most people go low comp for ease. but high comp akes more power. and is better all around.

SGT BRAD · Post by **SGT BRAD** » Mon Jul 10, 2006 9:38 pm

speedyrb29 wrote:as far as the cams go its a crance came #22.

crane 22 on sohc...hmmm really?

speedyrb29 · Post by **speedyrb29** » Tue Jul 11, 2006 12:04 am

its a 2.4 dohc i was origonally building up an na engine with 10.5:1 comp and crane 22's but now im thinking about turbos adn was thinking if i could pull it off with the 10'5:1 but i wouldnt use the 22's id have to get 14 or 16's

unsuper man · Post by **unsuper man** » Wed Jul 12, 2006 1:47 pm

no keep the 22's

speedyrb29 · Post by **speedyrb29** » Wed Jul 12, 2006 7:29 pm

y keep the 22's ? wouldnt they not alow the turbo to spool until really high rpms or somthin like that???

unsuper man · Post by **unsuper man** » Mon Jul 17, 2006 6:14 am

the higher teh rpm, the better the traction.

playboy2k4 · Post by **playboy2k4** » Mon Aug 28, 2006 11:30 am

2000 neon es's are stock 10.5.1 and they can run 8psi all day but the minute you get cocky and push more your done. So I guess what i'm saying is yes you can run that turbo setup on 10.5.1 compression

03blackrt · Post by **03blackrt** » Mon Aug 28, 2006 12:21 pm

playboy2k4 wrote:2000 neon es's are stock 10.5.1 and they can run 8psi all day but the minute you get cocky and push more your done. So I guess what i'm saying is yes you can run that turbo setup on 10.5.1 compression

all non-ngc 2.0 SOHC motors have 9.8 compressiion (non-magnum ngc motors have 9.3 compression).

slowass02R/T · Post by **slowass02R/T** » Tue Aug 29, 2006 3:33 pm

unsuper man wrote:ever see really fast turbo or s/c cars? theyre HIGH HIGH compression motors.

if you under stamd wht forced induction is doing, it makes sense. all "boost" is doing is momentaryily raising cyclider pressure. or the compression ratio. now if u have an ALREADY high comp, you get faster spool times, better off boost response, and more in boost power. but your tuning window is much smaller. not so small that u cant make it work tho. most people go low comp for ease. but high comp akes more power. and is better all around.

SO go ahead and build me a 13:1 SOHC that can run 10psi on pump gas ...

Most of the serious DRAG racing motors do not have to idle in traffic, run on 93 octane or survive for very long.

To run 10.5:1 and boost you NEED to run at least 100 octane just to have a tuning cushion. Lower the compression and be done with it. You'll have a engine that might not be as efficient as a higher comp motor off boost, but you will not be able to tell the difference, but on boost you will because you won't be limited by the higher static compression of the internals you choose.

Someone on the other .org did this exact setup on a 2.0 DOHC and promptly blew it up while making mediocre power. But hey it's your wallet.

Post by **jonnymopar** » Wed Aug 30, 2006 9:12 am

So it's been said a few times on here, it is possible to run that setup, but it would be better off to decide which is more important to you right now... making the N/A motor fast, or prepping it for a future turbo. Building N/A motors vs. boost motors require a bit different strategies, so it might be tricky to throw together one setup when you've already got plans for another.