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Rochester QJet

Posted: Tue Mar 30, 2004 1:18 pm
by Shorty40
Hey guys and gals :D

I have a prob with the carby now that the weather is cooling off abit.

My engine runs really cool (temperature wise :cool: ) Temp gauge barely moves over 1/3 and it seems the engine is not getting hot enough to cut out the choke :shock: It bogs down on intial throttle, stutters abit then clears its throat and then its fine. It does this whether the engine is just startde or after 3 hours of wheeling :?

Now here is my conundrum, I don't have a choke on the carb :?

Actually is has the heated choke but it has been disconnected. I was going to get an electric choke but never got around to it.

History - Rochester QJet and edelbrock performer manifold on a 253 Red pre-pollution V8.

Would it be temp/choke or something else ?

Posted: Tue Mar 30, 2004 1:22 pm
by -Mick-
Quadrajet is a biggish carb for a 253, I used to have the same setup and it bogged down badly under acceleration

Doesn't help you though :lol:

Posted: Tue Mar 30, 2004 1:25 pm
by Shorty40
Only started doing it in the last month or so :? Was working well before that.

Does it in all gears around 1500-1800 rpm.

It was a complete new carb about a year and a bit ago.

Posted: Tue Mar 30, 2004 2:26 pm
by planb
dan

ive emailed you some shiat re; qjet tuning

let me know if theres any dramas

Posted: Tue Mar 30, 2004 2:49 pm
by Shorty40
Thanks Rhys :cool:

Posted: Tue Mar 30, 2004 3:27 pm
by -Scott-
Not an off-road application, but I have a similar problem with a twin-carb setup on a 2.6 Sigma. I believe it's flooding from too much accelerator pump, the carby guy who was tuning it doesn't agree, and I've already got smaller pump jets/less pump volume than was recommended for the combination I've got.

I was about to reduce the pump volume again, but if anybody has a different suggestion I'd love to hear it.

Thanks,

Scott