Wont Rev. past 4000 rpms in gear!! - Chevy Nova Forum
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Old 24th-January-2008, 01:46 AM   #1
1977stroked
 
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Wont Rev. past 4000 rpms in gear!!

Ever since I got my auto meter tachometer I have notice that my car will not go past 4000 rpms. It sounds like the motor is at its limits at 4000 rpms and I cant figure it out. I have a Holley 670 street avenger, 454 lift/218 duration cam, offenhauser manifold, Longtube headers with single 2 inch exhaust(part of the problem), timing is at 38 total. It will rev to 5000 easy in neutral it just wont do it in gear floored manual shifting. Any Ideas?!?!?
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Old 24th-January-2008, 01:51 AM   #2
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What tach is this? Model?
Does it have a rev limiter?
is it set on the V8 setting?
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Old 24th-January-2008, 01:52 AM   #3
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What tach is this? Model?
Does it have a rev limiter?
is it set on the V8 setting?
It is an Auto meter sport comp monster, it does not have a rev limiter and I can not change the setting for 6 or 8 cylinder(doesnt have it)
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Old 24th-January-2008, 01:57 AM   #4
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Is your carburetor opening all the way?
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Old 24th-January-2008, 01:58 AM   #5
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Yes, Ill check again tomarrow.
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Old 24th-January-2008, 02:07 AM   #6
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Any Ideas will be greatly appreciated. I was actually going to shift it at 6000 at the track but it is hard to get it to go to 4500 rpms let alone 6000
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Old 24th-January-2008, 07:46 AM   #7
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it sounds like to me its your carb. check your throttle linkage to make sure your carb is opening up all the way.
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Old 24th-January-2008, 07:51 AM   #8
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Ign timing?

Did this start after tach install?

Did you have a differant tach before?
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Old 24th-January-2008, 09:01 AM   #9
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Are you using an HEI ignition with the ballast resistor still in the circuit?
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Old 24th-January-2008, 01:43 PM   #10
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Quote:
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it sounds like to me its your carb. check your throttle linkage to make sure your carb is opening up all the way.
I have had 2 carbs on here and they both do the same thing.
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Old 24th-January-2008, 01:44 PM   #11
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Quote:
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Ign timing?

Did this start after tach install?

Did you have a differant tach before?
It has always done this even before the tach install. Timing is at 38 total.
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Old 24th-January-2008, 01:46 PM   #12
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Quote:
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Are you using an HEI ignition with the ballast resistor still in the circuit?
Yes I am running an HEI ignition with stock wiring(it came stock with HEI)
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Old 24th-January-2008, 01:58 PM   #13
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Two things come to mind, first is the HEI module... I have seen this happen before with a failing module... second... Valve springs....Weak?
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Old 24th-January-2008, 02:06 PM   #14
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Ill look into the HEI module thing, but it runs so good on up to 4000 than it just wont go past. I dont think my valve springs are week because they are brand new and are made for high revving motors with the dual spring with an inner dampener inside of those. How much are those modules for the HEI?
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Old 24th-January-2008, 02:27 PM   #15
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I'd check the distributor out more closely. Remove the cap and make sure the mechanical advance flyweights aren't binding-up or being restricted in any way. Another thing to try is to throw another distributor in it and see if it get's any better.

I hate to say it but it sounds like iginition to me. It might be something else though but the most-obvious and easiest thing to eliminate first is the ignition. A stock engine will rev higher then 4,000 RPM.
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