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Author Topic:   Engine busting up...
jrhigd
Member
posted November 02, 2003 07:59 PM
probaly flooding it out need more spark or hotter plugs is your ignition all stock?


rico 08
Member
posted November 03, 2003 02:12 PM
It's probably floating the valves,those oldsmobiles blow up very easy so i'd leave it so it won't go any higher than 5000.


KPLugnut
Member
posted November 03, 2003 02:34 PM
It's not getting enough fuel when the secondaries open. Very common with quads.
Verify that you have no more than 6lbs of fuel pressure at idle, then make sure your secondary fuel feed tubes haven't fallen out of the top of the carb. Remove the top of the carb and there should be 4 brass tubes attached to the underside.
Also verify that your secondary metering rods are moving the way they should when the secondary air flaps open and that the plastic cam that moves the rod hanger isn't broken or missing.

Hope that helps,
KP


TimR
Member
posted November 20, 2003 07:22 PM
quote:
Originally posted by jrhigd:
Got a Oldsmobile 350 (not rocket) with 4 barrel Quadrajet in cutlass. Engine is total stock..runs fine in pits reving up to 5K RPM but busts up on track when running hard under load. Carb is 750 Quad rebuilt with other race work done to it. It also feels like the busting up (choking down) happens when the 2 back barrels open?? Could it be the timing? Or not getting enough gas as a result of using the stock fuel lines. It does have a fuel cell with fuel line coming out top of cell. Could it also be getting too much gas? Plugs look fine. Help me figure out why I can't get good power with the engine busting up?

a common problem on qjets was for the metering well tubes to leak at the base, this was easily fixed by a nifty kit from TomCo, well plugs with o-rings, and a small foam pad to hold them in place.

jm1656
Member
posted November 25, 2003 12:52 PM
is your alternator wired right? i had the same thing happend to me .... the thing was running off the battery which was charged before the races but did not have enough to power the motor at high rpm. wired the alt. correctly and she ran great!


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