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Author Topic:   carb stumbling
Dirt Forum Champ
Total posts: 730
posted February 06, 2005 06:30 AM  
We fired my motor up yesturday and its a little hessitant when we kick the secondaries in. We are thinking since it was only 55 degrees it needs bigger jets. What are some other things to look at?

360 ci, world heads 2.055in 1.60ex, 13 to 1 comp, edelbrock victor jr, gearte 750 carb alcohol, 92 jetting primary, 94 jetting secondary, .540 cam lift, 254 dur @ .050, 108 lobe center, moroso durafire ignition, carter 172gph fuel pump.

Hope that's enough info. Thanks


[This message has been edited by gould (edited February 07, 2005).]

Dirt Forum Champ
Total posts: 730
posted February 07, 2005 04:23 AM  

Dirt Forum Champ
Total posts: 1019
posted February 07, 2005 08:12 AM  
It's impossible to say if it's jetted too lean with those jets unless we knew what size auxiliary holes are drilled next to (or above) them in the metering blocks.
And since it's on alcohol, in those temps, it will probably act "cold blooded" more than a gas motor would and jetting changes of about 4 sizes on alky are needed to see the same effect as a 2-size jet change on gas.
Does the motor not want to come up to temp, or does it heat RIGHT up quick?
Again, it's impossible to nail it down without knowing/seeing exactly what is inside that carb and how it's set up.
Best advice I could give is to go up 2 sizes at a time and see if the symptom goes away, but monitor everything else while doing it.


Dirt Freak

Total posts: 300
posted February 07, 2005 03:24 PM  
everything was new or rebuilt when we fired it

Dirt Forum Champ
Total posts: 874
posted February 07, 2005 06:11 PM  
Just take the car to ames and let the boys at Hardcore get it running right.

Dirt Forum Champ
Total posts: 730
posted February 07, 2005 06:52 PM  
I don't think so.

The Flash32
Dirt Maniac

Total posts: 120
posted February 07, 2005 07:15 PM  
power valve?

Dirt Forum Champ
Total posts: 730
posted February 07, 2005 07:29 PM  
its too cold right now but once it warms up we are swapping jets. should be ok. the carb was completely overhauled right before it went on the motor. we also found the diaphram in the regulator had a pin hole in it. all is good now.

Dirt Forum Champ
Total posts: 1172
posted February 13, 2005 11:18 PM  
If its old alky it can be part fo it, fresh fuel might help.

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