Quadrajet problems

[Stk4996]

This past weekend in Ennis we acquired a stumble off the starting line that we never had before..
goes on the two step to 4600 clean no stumble but when launching it caughs a few times being a tenth and a half slow to 60' and 4 tenths down track..
we fattened it up and stumble was worse so we leaned it out some more and was faster down track but still had stumble..

Need to talk to someone that understands these well and possibly that I could send the carb to, to have it looked at...
Trying to get something going quick to make Noble and Dallas National.. thanks in Advance

Matt Diamond

[Hacksaw]

Do you know who built this carb?

[nickh]

Matt
The best in the business (q jets) are out here on this sight. One of them should chime in fairly quick. Had a guy down here in Houston that did incredible work but he retired from work and building carbs on the side so no help there.


Quadrajets are awesome once you get them tuned up correctly, they are either on or off..LOL

[terry1]

Had a similar problem a couple of weeks ago!!
Changed the carb to a fresh one from Deano, and all was great!!!
The "removed" card is on it's way to Dean O. as well.
He does great work with great results!!!
Terry K

[Brian Fink]

Terry is dead on ; contact Dean Oliver and you won't be sorry . He is on the net---Deano's Carburetors .

[Mike Pearson]

First thing to check is the float level and fuel pressure. Make sure you have a slosh tube on the vent and tape where the secondary metering rods go through gasket. Slow down the air door for the secondary's.

[Stk4996]

Thank you all for the info! I got Deans number at the track this weekend and gave him a call yesterday and voice mail and called once today, but haven't heard back.. l figure he is a very busy guy and will get back to me.

Going to check float level this evening, thanks again!

[HP HUNTER]

Originally Posted by Stk4996

This past weekend in Ennis we acquired a stumble off the starting line that we never had before..
goes on the two step to 4600 clean no stumble but when launching it caughs a few times being a tenth and a half slow to 60' and 4 tenths down track..
we fattened it up and stumble was worse so we leaned it out some more and was faster down track but still had stumble..

Need to talk to someone that understands these well and possibly that I could send the carb to, to have it looked at...
Trying to get something going quick to make Noble and Dallas National.. thanks in Advance

Matt Diamond

Whats your fuel system like?

[Future Super Stocker]

I build quite a few Q-jets. . For the small block I recommend .135 needle and seat. Use a Y-block off the regulator to the carb for a supply of fuel volume and use 5.5 - 7 fuel pressure. 6.5 is more than enough for the Q-jet. Rear flaps may need adjusting, but really done at the track.They should open at 1.350 for most and tension is adjusted 1/8" of a turn tighter or looser. Your Accl. pump shot can also be modified as well. There is mods that can be done to the carb for better performance. WD-40 and Marvels Mystery oil is your best friend. Keep all shafts and linkage lubricated. Hope this helps.