GT40s.com - View Single Post - Timing a Weber-based engine

Steve Toner · 06-01-04, 01:08 PM

I'd like to keep this thread on topic and not have it turn into a tutorial on carburetor operation, or the fine points of Weber jetting, or whatever. My jetting is close. I'm working with one of the major "hot rod" Weber suppliers here in the states, and we're working through the jetting and timing.

I did check my timing, and there was very little initial timing in it (the guys who set it probably believed the pointer was in the right place, but I've got a 302 cover on a 289 so TDC is not where it appears to be). I cranked it up to about 18 degrees initial/36 total and it woke up the engine pretty good. It seems like it can take more initial timing, but before I do put in any more, I'd like to hear if anyone else has any comments on the above procedure and any advice beyond "ask somebody who knows" about getting the total timing correct. OK, we have the suggestion from Trevor to run it on a dyno - are there other methods that can get me there without involving a dyno and that will not result in destroying the engine?

06-01-04, 01:08 PM	#5 (permalink)
Steve Toner toner 8 Tenths Join Date: Apr 2002 Location: Sundance, UT GT40: ex-CAV owner (stolen) Posts: 895 Rep Power: 15	Re: Timing a Weber-based engine I'd like to keep this thread on topic and not have it turn into a tutorial on carburetor operation, or the fine points of Weber jetting, or whatever. My jetting is close. I'm working with one of the major "hot rod" Weber suppliers here in the states, and we're working through the jetting and timing. I did check my timing, and there was very little initial timing in it (the guys who set it probably believed the pointer was in the right place, but I've got a 302 cover on a 289 so TDC is not where it appears to be). I cranked it up to about 18 degrees initial/36 total and it woke up the engine pretty good. It seems like it can take more initial timing, but before I do put in any more, I'd like to hear if anyone else has any comments on the above procedure and any advice beyond "ask somebody who knows" about getting the total timing correct. OK, we have the suggestion from Trevor to run it on a dyno - are there other methods that can get me there without involving a dyno and that will not result in destroying the engine?