Which Stroker?
#46
just wanted to jump in and say good luck, keep us posted with your decision.
i too, am very interested in going the higher compression stroker route.
i personally wouldn't go tt, and certainly not without an engine build.
if the engine build just wasn't satisfying enough on its own, i'd bolt on a supercharger. a pretty good article "Effect of compression ratio-supercharged 5.4L 4V." talks about the advantage of superchargers and high compression motors. yummy!
i too, am very interested in going the higher compression stroker route.
i personally wouldn't go tt, and certainly not without an engine build.
if the engine build just wasn't satisfying enough on its own, i'd bolt on a supercharger. a pretty good article "Effect of compression ratio-supercharged 5.4L 4V." talks about the advantage of superchargers and high compression motors. yummy!
#47
#48
Originally Posted by Gee3point5Mhmm
why will a 12:1 be pushing it with pump gas? (this is a question to expand my knowledge of NA motors, if you read it the wrong way.)![5091](https://g35driver.com/forums/images/smilies/action-smiley-029.gif)
![5091](https://g35driver.com/forums/images/smilies/action-smiley-029.gif)
the octane rating is a measurement of fuel's autoignition resistance and autoignition is the lowest temperature of spontaneous ignition.
it follows then to resist knock (due to increased compression ratio) increase the fuel's autoignition point by using higher octane rated fuel.
obviously thats oversimplified, and many things can lead to knock and its reduction: reduce pressure/decrease compression ratio, reduce spark timing, increase engine cooling, remove carbon deposits, richen the fuel mixture, and many other things...
#49
Originally Posted by IvoryGT
whatever...I enjoy high reving engines without worrying about where my boost is at...or if my vacuum line is screwed up...or if my fuel map is right..or..some other million gadget is going wrong. Plus im probably the only one that thinks 350 at the wheels is more than plenty for anyone on the road. looks like it'll be hard to get 300 at the wheels with just na.
That being said, I have seen some stroker VQs, and the potential is definately there, especially if the same amount of work goes into the VQ as was put in the 4 cylinder...
Also, the 4 cylinder was running on race gas, not pump.
I'll post up the link when I find it.
*edit*
http://my350z.com/forum/showthread.p...ighlight=s2000
Last edited by mIKE; 04-13-2008 at 01:48 PM.
#50
^i would have to say that the comments are always quite critical on that forum, as to why, I am not sure.
Thanks Nevdull for clearing up the compression and pump gas. I don't know extensively the mechanics and chemistry behind gas rating and knock, but I know when you are into the 12:1 compression and up, most are running race gas for added hp and safety for the motor.
In whatever case the budget for this project is probably somewhere around 15K at least. I will look more into it, I wonder why there aren't any shops just doing this to show case?
Thanks Nevdull for clearing up the compression and pump gas. I don't know extensively the mechanics and chemistry behind gas rating and knock, but I know when you are into the 12:1 compression and up, most are running race gas for added hp and safety for the motor.
In whatever case the budget for this project is probably somewhere around 15K at least. I will look more into it, I wonder why there aren't any shops just doing this to show case?
#51
Originally Posted by Gee3point5Mhmm
why will a 12:1 be pushing it with pump gas? (this is a question to expand my knowledge of NA motors, if you read it the wrong way.)![5091](https://g35driver.com/forums/images/smilies/action-smiley-029.gif)
![5091](https://g35driver.com/forums/images/smilies/action-smiley-029.gif)
Ideal Gas Laws.
Higher pressure = higher temperature.
more compression = higher pressure = higher temperature = more likely to detonate/knock/ping.
Higher octane is more resistant to detonation/knocking/pinging.
#52
After tripping over engine parts and getting myself full of oil while exploring the FI forum, I have been thinking the same thing. Perhaps the reliability of N/A trumps the overall of FI.
But a few questions come up. First, what power level can realistically be achieved? If the power vs. displacement curve is anywhere near linear, it looks like the strokers may top out below 300 WHP. Is 350 WHP a realistic hope?
Second, how will engine management work? Will the ECU from the 3.5 run the stroker? How would the engine be controlled and tuned?
But a few questions come up. First, what power level can realistically be achieved? If the power vs. displacement curve is anywhere near linear, it looks like the strokers may top out below 300 WHP. Is 350 WHP a realistic hope?
Second, how will engine management work? Will the ECU from the 3.5 run the stroker? How would the engine be controlled and tuned?
#53
Originally Posted by IvoryGT
whatever...I enjoy high reving engines without worrying about where my boost is at...or if my vacuum line is screwed up...or if my fuel map is right..or..some other million gadget is going wrong. Plus im probably the only one that thinks 350 at the wheels is more than plenty for anyone on the road. looks like it'll be hard to get 300 at the wheels with just na.
#54
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