Weber idle solenoid (1 Viewer)

[lehiguy]

I went back and looked at a friends setup (Weber 38/38) to see what we were running here at 5000 feet and up. 140 mains and 40 pilots. You should be looking at 150 mains and 50 pilots for your elevation especially if you do not have a header. There is just no way a naturally aspirated 2f is going to need that much fuel.

 

[jfnall]

I ran 150 mains for a long time. There is a really bad lag that hits at 2200 rpms. then leaps forward at 2700. with the 160 mains, no lag at all.

With the .050 idle jets, the run-on goes for almost 15 seconds. with the .065 - it will go for 1-3, and sometimes not at all.

I have run the seafoam, but no change. The only way I can get the run-on to stop is to idle around 400, and things get really clunky in the motor down that low.

I do have headers, with an RV cam, and 40 over pistons. Compression is up with the pistons. according the MAF. also have an HEI

I think I am going to go back to the OEM carb at some point, probably sooner than later.

 

[jfnall]

Waiting on an exchange idle solenoid. Mine tested bad. We'll see what happens when the new one gets here.

But thinking about things, could valves cause some of these issues? When I did my valve job last time, I set the valves with a cold motor not a hot motor. Just wondering of things might be off just enough.

 

[lehiguy]

From my own experience, the difference on a 2F between hot lash and cold lash is .001" or less. I have done all sorts of carburation experiments on all sorts of engines. As far as old-school mixers go for an off-road vehicle, I loved my Webers on smaller motors and Rochesters for bigger motors. The tuning is something that always came easy for me. My new fuel delivery plaything is TBI which I whole heartedly reccomend for your rig. Wrecking yard parts are plentiful, easy to find, cheap and they work well. You would not have to pioneer anything new since the pool of knowledge is large and easily accessible here on Mud. There are people who can do the chip programming for you. I had Brian at tbichips.com do mine from data I collected with a laptop as the vehicle was being driven. There are multiple posts and threads on the subject.