how much compression
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Joined: Oct 2002
Posts: 6,518
Re: how much compression
If you are getting knock at high RPM, you put too much compression in it. I've used aftermarket systems on the dyno to verify knock. Usually it's only at low RPM in well done setups around 100-110% VE max. Once you crank heat into the cooling system and intake air temps the knock will definately increase.
Bret
Bret
Registered User
Joined: Feb 2006
Posts: 32
Re: how much compression
what is the effect of gapless rings into this equation? it would seem if you are on the ragged edge of detonation, it might not be a good thing to increase the sealing ability of the engine, correct?
Registered User
Joined: Dec 1999
Posts: 2,248
From: Houston, TX
Re: how much compression
Originally Posted by LiENUS
Chances are your cam software is looking at what duration would be best and using a icl of 110 to achieve that if you really want to drop it down find a cam profile with a different icl with similar duration or better yet, rather than using software, talk to a cam designer before trying to use the software.
Interesting thoughts in this thread.
Ryan
Registered User
Joined: Jul 2005
Posts: 747
From: Baton Rouge, LA
Re: how much compression
Originally Posted by 96speed
Someone is helping with this as we speak. I was just trying to get a better idea.
Interesting thoughts in this thread.
Ryan
Interesting thoughts in this thread.
Ryan
Registered User
Joined: Dec 1999
Posts: 2,248
From: Houston, TX
Re: how much compression
Originally Posted by LiENUS
What software did you use to help you pick out the cam specs?
Ryan
Registered User
Joined: Jul 2000
Posts: 520
From: MD
Re: how much compression
Originally Posted by IHI
Probably why the stock bottom end lasted soo long
Oh well, next one will be a little "wilder". I gave up on mathmatics in racing (at our measily bracket level anyways) since after having a motor professionally built for the truck and told this wont work and that wont work, slide rule this and slide rule that.
Oh well, next one will be a little "wilder". I gave up on mathmatics in racing (at our measily bracket level anyways) since after having a motor professionally built for the truck and told this wont work and that wont work, slide rule this and slide rule that.
Registered User
Joined: Jan 2006
Posts: 230
From: Waterloo, Iowa
Re: how much compression
I know there are truely gifted folks out there that can acutally sim something on paper/computer and have the real product turn out exactly like they predicted, but these types are few and far between and/or really expsensive to obtain this great information from. I dont have a racing budget to afford these types so I just try to make educated guesses myself. Sure I'm leaving alot on the table but it's affordable and dependable which is what bracket racing is supposed to be, if I wanted max output obviously choices would be alot different.
The truck we had built was done using all these equations and slide rules and to put it lightly, the truck is about as mismatched and slow as can be for what it should be IMO. Things they said in the dyno room were debunked on the track. Things I've read about over the years seem to be more ice cream cruiser related and the track has proven these things worng as well.
Totally agree garbage in garbage out, 2+2 does'nt equal 3 or 5 on any calculator I've ever used either LOL
The truck we had built was done using all these equations and slide rules and to put it lightly, the truck is about as mismatched and slow as can be for what it should be IMO. Things they said in the dyno room were debunked on the track. Things I've read about over the years seem to be more ice cream cruiser related and the track has proven these things worng as well.
Totally agree garbage in garbage out, 2+2 does'nt equal 3 or 5 on any calculator I've ever used either LOL
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surreybrad
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