09-01-2001, 05:28 AM
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CC Member
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Join Date: Jun 2001
Location: Endwell, NY,
Posts: 31
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Not Ranked
double pumper question
My local machine shop guy says that double pumpers pump excess gas in the engine during normal driving if the roads are bumpy, washing the cylinders and causing oil dilution, etc,etc. I took off the double pumper and went to vacum secondaries, but lost a ton of instant response and midrange (went from 650 to 750). Was wondering how double pumpers are working for other guys in Cobras that are stiffly sprung--I think he's full of baloney. Am going to rejet the double pumper and try it,as it was way too rich before. Holly tech man recommends a 650 double pumper with mechanical secondaries. Obviously both carbs could be dialed in, but, are double pumpers as a category bad on less than perfect roads? Thanks, fantastic forum. |
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