Compression vs Horsepower

CrxKev · 2006-12-20

I searched for this but didn't find it. It is probably different for every motor and depending on other mods but: How much increase in horsepower will a motor see from (X) amount increase in compression?

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dragman99

· #41 · Dec 24, 2006

Crossroads said:
First, I'm not a kid. You jackholes assume too much and make yourselves look fucking stupid in the process. The reason why I quote articles is because I know how closed minded this community is. You don't believe anything that anyone says that goes against what you believe. You don't even have the reading comprehension skills to understand what I said. The only thing you all seem to be able to read is "uh...duh...it um, won't work" which isn't even remotely close to what I'm saying.

Why does NASCAR only run 12.5:1 with huge cams and still get 800hp? End of discussion and my involvment in your bullshit community. I'm going to talk to people who are actually knowledgable beyond the mechanical phase of engine building instead of people who have their heads up one person's ass. I feel less intelligent for having even posted on this forum. Flame away, asshats.

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dragman99

· #42 · Dec 24, 2006

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jimmyb34

· #43 · Dec 24, 2006

im a jackhole, hes a jackhole, were all jackholes

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transzex

· #44 · Dec 25, 2006

Crossroads said:
Why does NASCAR only run 12.5:1 with huge cams and still get 800hp?

Because thats the rules mandated by NASCAR, they used to run 16-17:1 until NASCAR made the rule trying to keep engine costs down.

I feel less intelligent for having even posted on this forum. Flame away, asshats.

Your the jackhole for not knowing the rules. Seems like your at a "Crossroads" in your life, not knowing what you want, but have alot of pent up angry.

Do us a favor.......

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Crossroads

· #45 · Dec 25, 2006

Last post. Here's a hint, for your bloated sense of self importance, it's called "cylinder head porting". That's how you make more power with less compression. Fucking idiots. You guys don't even know half of what you think you know.

The only thing I'm hanging is my dick in your wife's mouth.

Damn, I'm out of the cool kid club.

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dragman99

· #46 · Dec 25, 2006

Crossroads said:
Last post. Here's a hint, for your bloated sense of self importance, it's called "cylinder head porting". That's how you make more power with less compression. Fucking idiots. You guys don't even know half of what you think you know.

The only thing I'm hanging is my dick in your wife's mouth.

Damn, I'm out of the cool kid club.

but dude, you can port a high compression motor too.

and whoever said you were in the cool kid club to begin with.

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dragman99

· #47 · Dec 25, 2006

oh yea, i think you're license plate fell off man.

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Clutchmaster

· #48 · Dec 25, 2006

in before the lock....geez I read this whole thing.

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dragman99

· #49 · Dec 25, 2006

Clutchmaster said:
in before the lock....geez I read this whole thing.

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mattie_96

· #50 · Dec 25, 2006

dragman99 said:

hero biscuits are goood:IHI:

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s_18

· #51 · Dec 25, 2006

Crossroads said:
Yeah, Don Flores, JDogg from Rocket Motorsports, Chris Whitfield from Rage Racing, Earl Laskey (R.I.P.), ect. are just random dudes on the internet without any practical experience. Those guys sucks.

How can you say that? Do you actually have any clue? No practical experience???

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Clutchmaster

· #52 · Dec 25, 2006

dragman99 said:

i could go for one of those right about now

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transzex

· #53 · Dec 25, 2006

Crossroads said:
The only thing I'm hanging is my dick in your wife's mouth.

Damn, I'm out of the cool kid club.

I'm divorced, she got fat (doubled her weight) so if your getting a BJ from her, hope she swallows because she's likely hungry!

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Clutchmaster

· #54 · Dec 25, 2006

transzex said:
I'm divorced, she got fat (doubled her weight) so if your getting a BJ from her, hope she swallows because she's likely hungry!

damn...that burns bro

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boostdelinquent

· #55 · Dec 25, 2006

You know, I don't really know enough to take one side or the other but you (Crossroads) would seriously benifit from how you chose to word your statements. No one is saying you have to agree w/ the others however anyone w/ sense knows that calling people names and being rude won't get you far fast. All it does is put others on the defensive and ruins any chance for intelligent debate. We're all adults here, lets communicate that way and further all of our knowledge. Just my .02

:done:

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Clutchmaster

· #56 · Dec 25, 2006

boostdeliquent said:
You know, I don't really know enough to take one side or the other but you (Crossroads) would seriously benifit from how you chose to word your statements. No one is saying you have to agree w/ the others however anyone w/ sense knows that calling people names and being rude won't get you far fast. All it does is put others on the defensive and ruins any chance for intelligent debate. We're all adults here, lets communicate that way and further all of our knowledge. Just my .02

:done:

here here

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Crossroads

· #57 · Dec 25, 2006

I'll actually reply to that. The rest of the replies have been making me laugh.

The thing that gets under my skin is the constant assumption that I didn't start learning about engines until I signed up for this forum. Being treated like an incompetent bafoon puts people on the defensive really fast, too. This site is too closed-minded to new people. Once again, nobody bothered to ask me what I know they just assumed that I don't know anything. The assumption is that I read a post and thought I was a master builder. None of you have a clue how much time I've spent talking to these guys because I don't have enough posts to matter. Fuck that bullshit. The truly funny thing is that people consider me to be pretty knowledgable outside of this site and that includes professionals I talk to face to face.

Here's the point everyone seems to be missing. You can run lower compression with a properly ported head and full timing on pump gas while getting the same power as you would get at higher compression and pulled timing. The trade off is that your engine is more efficient and less prone to detination. The porting of the cylinder head puts your engine at or above 100% VE before even adding the compression into the equation. You select your RPM range, find CID per cylinder, and then figure out how many CFM you need to reach your horsepower goal. From there you match the IM and TB then select an appropriate cam. Power is in the head and tuning not in the block. This and this alone is my point. When you get right down to it, high domed pistons can disrupt flame travel and hurt power that way. This is where you build an engine as an entire unit instead of trying to poor-boy piece it together. Quite obviously, I did just learn this yesterday, have no practical experience, and I'm really just talking out of my ass. You guys need to climb down out of your fucking trees and stop treating all newbies like they're here to troll your message board with B-Series crap.

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transzex

· #58 · Dec 25, 2006

we are poor boys, but done correctly the PROPER piston would be dished, not a flat top or domed.

"Dude, you got a HEMI?"

Lets talk quench......

Is it BAD for the piston to KISS the head????
Not if you wanna keep the quench as tight as possible.

Closed chamber vs. open chamber heads.......there is not PERFECT motor....

Porting won't get you above 100% VE, tuning the resonant pressure wave will, aka "Ram Effect".....porting will help this wave though......

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SLO SOHC

· #59 · Dec 25, 2006

I saw some shit that i didn't think was possible!

Oh and what is said is false until it's done and working!

Tuners just dont like to think outside the box and get crazy!

Bone do you know of a certain b series runnin a 95mm scat crank...

I've heard talk but cant find out who....?

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88cr-rex

· #60 · Dec 25, 2006

Crossroads said:
None of you have a clue how much time I've spent talking to these guys

And transzex and I haven't? Further more, the people on here WITH ACTUAL REAL-WORLD EXPERIENCE have posted their ideas and you ignore them because the gods that be on honda-tech have said its improbable.

Crossroads said:
The porting of the cylinder head puts your engine at or above 100% VE before even adding the compression into the equation.

Here you go again with your blanket statements. I am convinced this is your main problem. You regurgitate other people's comments out of context and then apply them to any situation. Do you even know how to calculate VE?

Do you honestly think there are many n/a engines on the street that even approach 95%. Even on honda-tech? An n/a motor that sees 100% VE is one very well built motor. Have you built one?

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