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The thread below about how fast people have gone in their Corvettes reminded me of a small problem I have with mine when I try to set land speed records. I haven't done much investigation yet as the car runs great in normal slightly aggressive driving. But if I run it up to 4000+ rpm in any gear it definitely bogs down, like a governor kicking in. Sounds fuel starved which I have assumed is the problem as it does not have the correct high volume fuel pump. Am I on the right track or should I be looking at other things? Thanks for all suggestions.
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Re: '64 365HP Bogging Down at High Revs
Sounds a lot like a problem or 2 I've had in the past.... Check the float level on the secondary side of the carb. Sounds like you are running out of gas but only after the secondaries have opened for a bit. A stuck needle/seat in that bowl could do it also.
If that's not it, then go for a new coil. It reacts almost the same way and it won't get better.
Just thought of another... could be point's bounce also. If you are running points, get a new heavy duty set that can handle the increased rpm's. -
Re: '64 365HP Bogging Down at High Revs
A problem I ran into like this was a rebuilt fuel pump. I found that some rebuilt fuel pumps will not keep up with the volume needed at top end.
I even tried getting the rebuild for the engine that should consume the most, yet it wouldn't pump enough.
The cure is a real new AC pump.Comment
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Re: '64 365HP Bogging Down at High Revs
How old is the fuel filter?
Free rev the engine to 6000 revs with a dwell meter attached. More than 2 degrees variation means the dist. needs work. Even when new the distributors were marginal an needed to be blueprinted. Also, SHP engines should use the high breaker arm tension points, but they were never OE or called out in the various OE and aftermarket parts catalogs.
DukeComment
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Re: '64 365HP Bogging Down at High Revs
David:
All excellent suggestions, above. I personally had a points bounce problem which came in @5000RPM approx., with my 1965 L76. I installed the high breaker tension points at Duke's suggestion. The motor now pulls strongly for as long as I dare to keep the "go" pedal planted (upwards of 7000RPM). The engine has stock rods, so that is pushing the durability envelope, I am told.
Another place to look, is at your advance weights. I know, from experience, that they can become bound due to hardened grease, and cease functioning.
JoeComment
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Re: '64 365HP Bogging Down at High Revs
Thanks for the great advice so far. The coil is new so I won't have to mess with that. The previous owner put on a new Holly 3 years ago (650 I think, I'm not at the car)so I'll play around with that. The HD points are a good idea and I'll do that regardless as I doubt the ones in there are anything but stock. I do have a new not rebuild pump ready to go and that will be last if I need it.
I don't think I can get to 6000 rpm to check the distributor but I'll try if the carb work doesn't pan out.Comment
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Re: '64 365HP Bogging Down at High Revs
Those weights should be cleaned and LIGHTLY greased each time you do points. Lightly means you should see a sheen and the grease nearly invisble. Any more will grip them more than let them slide and will also fling off inside the cap and coat all the things you don't want coated.Comment
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Re: '64 365HP Bogging Down at High Revs
Mike:
Wow! The server was down for a full day. John W. must've had a helluva time fixing the problem. My hat's off to him.
Anyway, finally, just to clear things up, and to restore my "credibility" (that is, if I ever had any to begin with), I want to point out that the "stuck weights" situation was what I found when I first went "inside" my 1965, looking to fix all of the driveability problems.
You do not know me, and so I suppose that you are justified in misreading my post, above. Yes, I can be rather lamebrained at times, but I cannot recall ever doing something as dunderheaded as overlubricating the advance flyweights. I mean, well, that's almost as dumb as trying to dry off the family Chihuaua in the microwave.
JoeComment
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Re: '64 365HP Bogging Down at High Revs
Joe,
while you (or most on here) may never do that, my experience is you can never anticipate what someone else reading these may do. And it is quite possible that someone between your posts on weights sticking and mine has already globbed enough grease on to do the bearings on all four wheels.
Seen too many greasy distributors to believe otherwise.Comment
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