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Re: stumped
interesting. my scorpion with twin small block 260's does the same thing. after a hard run the idle hangs at about 1500. wonder if there is any one perticular component the we all have in common. mine are basically stock except for cams and intakes. i have the stock T-bolt ignition (old style).
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Re: stumped
I'm running a BG carb w/no choke. could be not related but it never did it before I started messing with timing. Well actually I set the timing then had to adjust my idle stop a little to dail in idle so I guess It could be hanging up.
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Re: stumped
i wonder if they may be running a bit rich (loading up just enough to idle at 800), then after a run they clean themselves out and idle higher. just thinking. i hate carb problems!!
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Re: stumped
Originally Posted by rookie_j
i wonder if they may be running a bit rich (loading up just enough to idle at 800), then after a run they clean themselves out and idle higher. just thinking. i hate carb problems!!
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Re: stumped
Heat build up is the common thread I see here. Guess I am the only one...
BT |
Re: stumped
O.k. lets say its heat, next Q is how does that raise my idle?
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Re: stumped
Originally Posted by blue thunder
I have a similar problem in both engines, just not as bad. After a hard run they like to go to 1100 -1200rpm at idle. This seems to last a couple minutes then then start dropping back down to normal, which is about 800rpm. I have fooled with both carbs several times and know the butterflies are closing properly. I am leaning towards heated air going into the carb from a hot engine room. Doesn't really make sense to me because I think that would create a rich a/f mix (air less dense) and therefore lower idle. Usually lean causes a high idle. Just thinking out loud here and looking for ideas myself.
BT |
Re: stumped
Mine does this also, if I'm going into a no wake zone I have to shut the engine off then start it back up then it idles at the right rpm
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Re: stumped
No areo, it is n/a.
Don't know the answer Just once, but if we follow that train of thought I could come up with: (Note these are ideas not facts) thinner oil so oil pump consumes less hp. coincides with normal pressure drop when oil is hot hotter air charge? Higher internal fuel bowl pressure due to temp that causes idle circuit problem in holleys. Never had this problem on my qjets (hmmm) hot tbolt module that when hot advances timing? Please add on.... BT |
Re: stumped
Maybe it would help if each of us with this phenomenon listed specs. Maybe there are other commonalities. Mine are:
mark 4 - 454s tbolt 4 800cfm holley double pumpers msd 6 al amplifiers mechanical fuel pumps closed cooling BT |
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