Rough running at low rpm could be a lot of things valve adjustment,
vacuum leak and such but if you have all these things right and feel
good about the condition of the engine my guess is it is to lean. Try
increasing the main jet size in the primary and see if it gets better.
140 primary and 160 secondary would be a good place to start if you have
a big cam you may want to go bigger. Jim E
cs_tscg@bellsouth.net wrote:
>Over the past few weeks, I have been working the Series IV. The first thing I
>did was replace the original engine which had started leaking water
>internally. I replaced it with my rally engine I had built a few years ago. It
>was going in a car I wanted to use to enter road rallies. However other
>commitments have prevented me from going ahead with this project. The engine
>is a early series with .060 pistons and a late series head. It also has the
>late series fuel pump. I am running the single Weber, but plan to switch it
>with the duel 40DOCEs. I went with the 1600 block because I wanted the block
>to match the car. (which now it doesn't) I am having a little trouble tuning
>everything. I didn't think the setup would make much difference in jetting,
>but it may. When I activate the 2nd stage of the car, it runs great. But when
>I am just cruising, the car runs rough. I will look into this in the next week
>or two as time permits. Maybe I will just go on with the dual 40s. I am open!
> to opinions on the jetting issue.
>
>The other thing I did was install one of two overdrive transmissions I had. I
>hooked everything up last night but did not have time to test drive. My first
>experience with the new transmission was this morning on my way to the
>airport. Wow! What a big difference it makes. I was racing the big SUVs! I did
>no expect it to work first time out since I was using old scavenged electric
>parts. But one flick of the switch and the RPMs dropped. What a good feeling.
>
>Next - AC and a hardtop!
>
>Just wanted to share the joy
>
>Chris Stephenson
>PeopleSoft Implementation and Support
>cs@tscg.net
>(404) 915-7669
>
>.
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