Can't rev over 4500 rpm

hunt2elk · Nov 23, 2021

Ron H said:
This doesn't sound right...if I follow...34 degrees at idle...zero change at 3k rpm??

Could a guy even get the motor to start at 34 degrees without a switch holding off the ignition until it is spinning?

Cojohnso1 · Nov 23, 2021

Kern Dog said:
Nobody has chimed in to ask for more details?
I had this condition and it turned out to be a flat cam. It would idle okay, rev okay but under full throttle, it popped up through the carburetor. The exhaust lobes were heavily worn on two cylinders so the gases were trying to escape through the intake valves.
A compression test may help but removing the valve covers and looking at the movement of the valves would be better.

I have experience this too. But steadily got worse. Which red flagged the cam. Any coil issue was start/non start. (But have heard of this if coil gets too hot. Would be surprised this time of year)

19 69 GTX · Nov 23, 2021

Here is a picture of car for whoever ask lol

AR67GTX · Nov 23, 2021

Must have a heck of a starter to turn it with 34 deg locked timing. I think most racers who run locked timing have a retard feature in the ignition for starting.

Can't rev over 4500 rpm

hunt2elk

FBBO Gold Member

Cojohnso1

Well-Known Member

19 69 GTX

Well-Known Member

AR67GTX

FBBO Gold Member

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