How does a 64cc chamber increase low torque?
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Pro
Joined: Aug 2001
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From: hamilton square NJ
How does a 64cc chamber increase low torque?
I been doing a little reading. :D . So how do I increase my low end torque by going from a 67cc which is stock to a 64cc?? Anyone know how this kind of stuff works?
Drifting
Joined: Mar 2001
Posts: 1,896
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Re: How does a 64cc chamber increase low torque? (xfactor974)
It's a smaller chamber..so it gets bumped up alittle. Thinner head gaskets will do it too.
You've got the engine I want. But on 383ci and a bigger CFM carb..
What is your comp?
You've got the engine I want. But on 383ci and a bigger CFM carb..
What is your comp?
Melting Slicks
Joined: Apr 1999
Posts: 2,010
Likes: 3
From: Moon Twp. PA USA
Re: How does a 64cc chamber increase low torque? (xfactor974)
Stock cc on a '76 is 76 cc not 67. GM specs show Cylinder Head Volume (cc) of 75.47 for the L-48, and 76.18 for the L-82.
I was told, by Trick Flow, that using a 64 cc head would get me up to about 9.5 C.R. on my L-48 VS 8.5 stock.
I was told, by Trick Flow, that using a 64 cc head would get me up to about 9.5 C.R. on my L-48 VS 8.5 stock.
Drifting
Joined: Nov 2000
Posts: 1,361
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From: Honolulu Hawaii
Re: How does a 64cc chamber increase low torque? (xfactor974)
Raising the compression is one way to increase cylinder pressure. Cylinder pressure increases build torque. To much cylinder pressure can cause predetonation. So there is a fine line between optimum cylinder pressure and too much pressure. The cam timing is the other major factor that determines cylinder pressure.
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Safety Car
Joined: Mar 2001
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From: Rochester NY
Re: How does a 64cc chamber increase low torque? (xfactor974)
All of the things posted are correct for sure. One more thing though, a small head chamber also promotes better frame travel across the piston dome. This also helps with a tune-up, as the charge is not as violent. The best set-up for optimum power regardless of compression ratio is to have the smallest dome possible with the chamber sized for the correct compression ratio wanted. On my 385 I had a 60 cc chamber and 3 cc dome to get a healthy 12.75 to 1.
:cheers:
[Modified by Xracer, 9:35 PM 9/8/2001]
:cheers:
[Modified by Xracer, 9:35 PM 9/8/2001]
Drifting
Joined: Feb 2000
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From: Clarksville,Tn,USA TN
Re: How does a 64cc chamber increase low torque? (Xracer)
Xfactor,
What compression rating are you looking to bump up to?
Xracer, what kind of fuel do you have to run at 12.75.1?
Neil in Tenn
What compression rating are you looking to bump up to?
Xracer, what kind of fuel do you have to run at 12.75.1?
Neil in Tenn
Safety Car
Joined: Mar 2001
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From: Rochester NY
Re: How does a 64cc chamber increase low torque? (Nomad78SA)
Neil,
The motor was not a deal were I drove it much on the street. It was in my Pro Street Camaro that is on my web site, check it out. But to answer your question, I ran 110 octane for cruising and VP C-16 or 116 octane when I raced or used the NOS. I did use pump gas in it once when I got caught short on a cruise night. But I did not get over 3000 rpm so I was not building any cylinder pressure. The higher the octane rating the less prone to pre-ignition.
Joe
The motor was not a deal were I drove it much on the street. It was in my Pro Street Camaro that is on my web site, check it out. But to answer your question, I ran 110 octane for cruising and VP C-16 or 116 octane when I raced or used the NOS. I did use pump gas in it once when I got caught short on a cruise night. But I did not get over 3000 rpm so I was not building any cylinder pressure. The higher the octane rating the less prone to pre-ignition.
Joe
