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  #1 (permalink)  
Old 08-10-2006, 09:03 PM
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race car problems

Can To Big Of A Cam In My Race Car Cause It To Break Up
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Old 08-10-2006, 09:53 PM
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I dont post much but I think everyone will agree that a little bit more info is needed to answer your question, like what broke??
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Old 08-11-2006, 01:12 AM
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Too large of cam should do nothing more than move the usable power band way up in the RPM range. Higher you rev, the better it will feel. Overall it will cost you performance, but at high RPM it should run clean. If your engine is missing and running bad don't blame the cam - look for carburetor or ignition problems. If the cam was installed improperly, then the problem would be with the installation (like not lining up the dots), but this would screw up a moderate cam also.

And everything is relative. Even a very large cam will work if the remainder of your race car is prepped for it. A low rear end ratio and very loose converter will allow a monster cam. If your converter stalls at 5,500 it doesn't matter that your cam doesn't produce much torque at 3,000.
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Old 08-11-2006, 05:49 AM
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If you don't have enough valve spring pressure for a "big cam" then yes the engine will break up.

What cam are you using and what valve springs are you using?
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Old 08-11-2006, 09:25 PM
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race car problems

The Car Will Idle Fine, When You Hit The Throttle And It Hits 5000 rpm It Will Start To Cut Out And Break Up, Can Somebody Please help Me find Out What My Problem Is Thanks 77r Racing Team
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Old 08-11-2006, 11:16 PM
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I agree with Czar. Did you install a spring with enough pressure to handle the camshaft?
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Old 08-12-2006, 12:32 AM
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Weak valve springs is a good shot. How about something simple like your rev limiter coming in early?
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Old 08-12-2006, 01:36 AM
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Another simple check - fuel starvation - dirty fuel filter - bad fuel pump?
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Old 08-12-2006, 09:18 AM
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did you

did you degree the cam ?
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Old 08-12-2006, 01:22 PM
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race car problems

Would The Power Valve On The Carburetor Cause It To Break Up When It Hits High RPM
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Old 08-12-2006, 01:24 PM
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Bigman77r - can you let us know what you have done to the engine. I would like to know just what you are running for ignition and if the distributor has been checked on a distributor machine. Simply put, a problem has to fall into one of three areas: A mechanical problem like the valve springs are weak; a fuel problem that is allowing the bowls to run dry; or an ignition problem that is scattering the spark. So list what you have and we can give a better guess on what's wrong.
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Old 08-12-2006, 01:54 PM
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race car problems

Valve Springs Are New,New 500 Holley Carburetor And Distributor Is Also New
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Old 08-13-2006, 11:56 AM
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race car problems

can oil leak cause it to break up
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Old 08-14-2006, 10:45 AM
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Altho you say the ignition is new what type is it?,are you running an alternator or just a battery?How are your grounds?
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Old 08-14-2006, 08:19 PM
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race car problems

I Am running A Battery, And I Have 2 Ground Wires
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