High compression on an VQ NA build offers no benefits, power, reliability, or otherwise.

 

compression definitely has benefits on any engine. where did you learn that it doesnt?
for example lets say you have a stock engine with a 10 to 1 compression ratio. go dyno it. then put in low compression pistons to lower it down to lets say 8.5 to 1, dyno that and see the difference.

 

Don't bring logic into this.

I am referring to not detracting from reliability like turbos and to a lesser extent sc do.

kacz07 do you have an NA build? I'd love to see your NA thread where you show the fruits of all this knowledge.

 

Sorry, thought it would translate.

I agree my cost to benefit ratio is very bad but I have a bulletproof torquey motor that I am enjoying. Shame haters gotta hate.

 

I hate posting again about an arguement that really has nothing to do with this thread, but here is a link to kaz's build thread

https://my350z.com/forum/na-builds/4...50z-revup.html

Redline you are posting without any kind of knolledge...

 

I'm not arguing FI for reliability. I know, theoretically, higher compression is supposed to be more power. On the VQ, as per SG:

https://my350z.com/forum/8281567-post22.html

Thanks Guys!

Regarding the compression ratio, the pistons have an 11.5cc dome, which if I am correct will result in around a 12.1:1 compression, not the actual target 12.3. The little bit of material around the spark relief is another 0.3~ cc's.

From my understanding, I should be seeing roughly 5% power for each point of compression (up to a point, of course), so the 2 points could in theory net 30 wheel. I don't expect that and will be happy with anything more than 15.

E85 is a great idea, I don't know much about it. For endurance racing I believe the fuel consumption is higher so that might be a problem for our current 1.5hr stint strategy, the cell just isn't big enough. I'd also have to check the bladder in my cell and make sure that it's ok to use with alcohol.



Annnnnnnnnd:

https://my350z.com/forum/8382568-post26.html

Thanks!

Well you guys would be amazed, the higher compression pistons yielded absolutely no gains what-so-ever. Infact, the dyno plot basically was a carbon copy of what it was with the stock engine.

Two tests were performed:

Stock intake manifold, throttle body and Skunk2 spacer

AND

Our aluminum box with open 3.5" hole in the top.

Both plots look identical to the power you've seen before, which was quite amazing. The only changes other than the pistons and rods were Mark II racing fuel and NGK racing spark plugs that have more clearance to the plug.

The engine has now developed a nasty vibration or flex that is causing the flywheel to actually hit, and destroy the crank angle sensor only at very high rpm under very high load!

It's really quite amazing. Other than that the engine runs perfectly, has great oil pressure, doesn't smoke etc.

The flywheel has been off and inspected, we even did some tests to try and figure out exactly when the flywheel is "growing" and it seems to be happening ONLY above ~4500rpm.

I tuned the traction control on the Motec M800 and god damn the car sounds amazing at full load 7000rpm with 50% ignition cut, you just have to hear it. Ahhhh

And then right after that glorious moment, the crank angle sensor is destroyed and she just silently rolls to a stop. It's really sad.

Chill out, man.

Yeah, maybe you've seen/commented in it. I'm 11.5:1.
https://my350z.com/forum/na-builds/4...50z-revup.html

 

So you are just pissed that you did not break 300 and are taking it out on me? I see nothing in your first post (as far as I got just now) referring to a magic intake.

 

What? I'm at 310 and going higher with a new magic intake. I'll top your build number on stock stroke and bore. Are you crazy?

 

I didn't break anything nor need to go back in. After looking again I see 303. I am at 347 ARE you crazy??????

 

I saw that I said I was sorry you broke your motor. Pot meet kettle.

Apparently we can add inability to count to your gifts.

1 post last page, 2 second to last and one of them addressed to gabe, the one to you was also offering positive thoughts towards your cam issues.

https://my350z.com/forum/na-builds/4...-revup-25.html

 

That saying doesn't even make sense in this instance. You're taking this way too personal and have addressed nothing in my posts about theory vs. actual application.

 

Calling me a troll is 100% pot meet kettle.

I said what my motor did, showed my gains. You cherry picked parts of my build and said they made no changes. I said it is what it is and you keep making blanket statements. I am not saying anything but what my motor has/what my performance is.

I never said anything of the things you are saying are untrue or invalid, just that I have what I have and am happy with my results. Apparently that is offensive to you.

We have gone round & round and now you are calling me inapplicable names.

What am I missing?

 

 

Ok buddy first off if you're gonna try to sound smart at least learn how to spell "knowledge". I have worked on cars since I was a little kid, I'm a certified tech and have done a ridiculous amount of motor work. Really don't like to be a d!ck or anything but don't assume things about people.

 

Ok what "ridiculous" amount of engine work have you done... I'm very curious.

 

I worked mainly on Volkswagen/Audi which I hated but worked on other makes as well, anything from simple timing belts, replacing blown motors to , cams, rebuilding heads replacing bent valves from when, springs, retainers etc. Rotating assembly replacement . Rebuilt a manual transmission , replaced transmissions, I could go all day . I got out of all that and now I'm an I.T lol

 

*from when people forget to replace their timing belts* I don't know why that was left out

 

Redline, in 2 threads (I think the same 2 that e30 has made himself look like a dick) you have spurted out that this and that has to make power because it does in every other car, I guess what I am saying is you are assuming a lotta stuff and there is proof of it unless you ask e30... I will admit, I didn't believe you didn't gain any power from higher compression, and there was evidence that head work was fairly un needed (I had a 3 angle done anyway) just look through the build threads, absorb the info and learn from what others have done.

I am terrible at spelling, but I still don't understand why misspelling a word is such a big deal...

 

I'm not here to fight and argue brother , misspelling is no big deal either I was just breaking your ***** because you were breakin mine haha, I misspell **** too like the silly immigrant I am. As for the whole compression issue . An engine is an engine , no matter if its a VQ or a lawn mower , basically just an air pump. To make power everything from intake piping, manifold, runners, cams, exhaust manifold. All works together, higher compression is just an addition to the equation .from what I've learned , simplest way to put it is, More air in +more air out = makes more power

 

Thanks, I have been waiting for proof you were intentionally jumping on the bandwagon against me in now 2 threads that I simply stated what was going on with my car and not making any statements against anyone.

I submit you were on the side of the person in the wrong in both cases.