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SU jetting and tuning 140-160

uid 779's pic
posted by  matt b on  Mon Jan 6 06:40 CST 2003
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last visit: Tue Oct 14 16:33 CST 2014
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this is regarding the "project 145". Over the weekend, I pulled one of the jets for replacement, as it was a jet for a rear carb, and installed on the front carb. I know, I know....

I also adjusted the rich/lean appropriately, and got 'em synced just right. Only problem now is that the car just does't have the upper end power it used to. Feels a bit starved for fuel. However, this didn't feel to be the case in the mountains.

Upon furthur inspection, I noticed that the jet I removed had a larger hole in it. So, the question is, could it be that I need to go with oversized jets? Or would I be better off trying narrower needles? Both? Would an elevation gain of about 2000 reveal that, or am I off my rocker again? Or is there something else I should be looking into? Of course, I could keep riching it out more, but I figure the venturi would have to be dropped well below the surface of the carb intake, which couldn't be ideal.


Keep in mind this is the "mystery engine" which is an overbored, biggie valve, high lift cam '74 B20... The fella I spoke with when ordering the new jets seemed to think that stock jets would be fine at my (5000 foot) elevation, but now the car runs right only when at about 2000 feet higher..

Thanks for any insights...
-Matt





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