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Author Topic:   2g jets
racer17j
Member
posted June 03, 2002 01:24 PM
i have always run the smaller rochester carbs and now have the big 2g i'm down to 70 jets and still the plugs are black and i'm blowing flames out of the pipes how low have you guys gone down on thoses before. another part of my question is if i went to a hotter plug or higher octain fuel would that help any i run ac 45plugs now and 89 oct ethanol haven't put my molth balls in yet this year wanted to get it tuned first


merlinmech
Member
posted June 03, 2002 10:09 PM
You might check your power valve first. I'm running 84 (holley) jets right now with power valve blocked off.


racer17j
Member
posted June 04, 2002 01:05 AM
i let a buddy of mine use it and it worked fine for him. thats what i can't figure out i have heard of guys running in the 90's with theses carbs i'm using holley jets too


KPLugnut
Member
posted June 04, 2002 12:32 PM
I'd be looking into your ignition. Sounds like weak spark, or timing issues. That, or excessive fuel pressure is causing that carb to flow way too much fuel for your motor to burn, even tho it works fine on your buddy's car.
Another thing that I noticed is the old "mothball" thing....I didn't know people still believed that wive's tale....

:-)
KPLugnut


Brad haddix
Member
posted June 06, 2002 08:23 AM
the cats I know that are running jets in the 90's don't have the siphon tube next to the "power valve" they pulled it out saying it causes a rich condition on the top. any comments lugnut? I'd check ignition as well


KPLugnut
Member
posted June 06, 2002 08:29 PM
We remove the siphon tube as well. It feeds too much fuel in the mid-range and makes the carb jetting nearly uncontrollable. Also, none of our carbs except the most radical of
our "outlaws" need to run more than a 76-78 Holley jet (which equates to about a 82-84 rochester jet, which we can supply, btw)....unless, of course, you guys are blocking off the power valves for some reason, which only invites more tuning troubles, imho, with the 2G's.
But to answer the question another way, if that siphon tube is still in there next to the power piston, it should be removed before
even attempting to get the jetting right.

Hope that helps,
KPLugnut

[This message has been edited by KPLugnut (edited June 06, 2002).]

racer17j
Member
posted June 07, 2002 01:53 AM
i'm kinda dumb when it comes to carbs and haven't realy looked it over. all i can tell you is it's a speedway 2g. but i think i fugured it out i'll see this weekend me and bud put the new line on my balancer lol he was wrong i checked it the other nite by myself and it was marked on the wrong side of tdc i'm hoping that will help cure my cooling problem also but i got a set of 68/69's today just in case


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