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Author Topic:   help--wont go over 4600-5000 rpm
demoderby
Dirt Roller

Total posts: 5
posted June 08, 2005 09:53 PM  
ok here goes 81 regal pure stock car 3600 lbs 350 chevy bored .060 flat top pistons 440 lift speedway cam matched springs 4 bll intake rochester (industrial carb )--has a big adjusting screw in rear middle of carb center-70 jets 882 heads --410 gear 168 3 speed tranny running688 final with 85 rollout tires----I CANT GET THIS THING OVER 5000 RPM tell tale tach tells me so--motor runs good no miss but seems like it takes a while for the power to come on --so im thinking throw away the carb---what do you guys think??? email me terry10x@webtv.net

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iowatoolman
Dirt Freak

Total posts: 369
posted June 08, 2005 09:57 PM  
could be that the springs are set wrong (had that happen before)
or ignition module
have you checked that the carb opens all the way?

check those things

racer17j
Dirt Forum Champ
Total posts: 5390
posted June 08, 2005 09:58 PM  
the carburetor is a 2 bll mounted with a adapter on a quadrajet intake manifold. I have a hei distributor with lite weight springs running 36 degrees total timing at 2500 rpm.valves are set at 1/4 turn past clatter .module and coil is msd products. The carb does open all the way.The track size is 3/8 on the inside of track.The car takes off fine from start and runs fine but seems like it has a governor on it--takes about 1lap of green flag racing for itto fly but then after the race --my tach only says 4600 after a 20 lap feature race--its a new tach --old one read same...I think my problem is this darn carb since its a industrial one --thats what kplugnut told me he thought it might be-- thanks

Footlead
Dirt Roller

Total posts: 24
posted June 10, 2005 07:20 PM  
It has to be springs tooooo weak,,,,tooo much timing or carb. Did you put the cam in straight up or 4 degrees advanced at the crank gear???

Footlead
Dirt Roller

Total posts: 24
posted June 10, 2005 07:27 PM  
Or the valves could be adjusted tooooooooo tight,,,,are you sure that your timing is correct?? sometimes those stock balancers will spin on the hub and your timing mark will be a long way off. I have had that happen to me before the stinking outer balancer ring moved over an inch,,,that is alot of degreeeeees. I have also seen a dirty plugged air filter do the same thing.

good luck

Good luck

demoderby
Dirt Roller

Total posts: 5
posted June 10, 2005 09:46 PM  
the cam was dialed in but was only off about 1 degree so we left it straight up. the balancer was checked when we dialed in the cam and used a piston stop and found the balancer to be accurate...it has a new air filter in it(paper) but did the same thing with a 4 inch tall k&n filter...has anyone had any luck running a industrial 2 bll 2gc carb??? im thinking maybe this carb is metered for low end torque and has no topend and thats exactly what my problem is---i bought the carb off ebay and think its a piece of junk---mybe i should buy a speedway carb??

x factor
Dirt Full Roller

Total posts: 34
posted June 11, 2005 05:58 AM  
You may want to try replacing the baseplate with another one that doesn't have the govenor provision on it. The base plates will interchange but you may need a different gasket.

I had bought one from a swap meet like that and made the change and works very good on the top end, turned 6500 all night long.

El Santo
Dirt Full Roller

Total posts: 36
posted June 12, 2005 10:31 PM  
What carb adapter are you running? If it's the one that mounts the carb over the center of the Q-jet intake you will never get enough airflow to get over 5000 rpm's. Either get a carb spacer that mounts the carb over the secondary openings, or just go with a 2 barrel intake.

demoderby
Dirt Roller

Total posts: 5
posted June 12, 2005 11:00 PM  
el santo--the carb spacer i have IS one that mounts the carb in the middle of the opening on the q jet intake--i tinks ill try my 313 canadian intake manifold for the 2 bll

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