check for lean condition? (new 3x2s)

[Dan Baldwin]

Hi all. Just installed my new used 3x2 45mm OER Racing carbs. Car runs fine, but limited to ~70% throttle at the moment.

Anyway, I need to know if I'm running OK (not lean) so I don't hole a piston or something. Don't have time to get to the dyno before track days this weekend, and don't have an A/F or exh. temp meter.

 

All informed opinions/thoughts welcomed!

 

Thanks,

[mustard-z]

You should pull the plugs and inspect. If very clean, then you are lean. If sooty, they you are rich.

[Tim240z]

Dan,

Yeah easiest way is to do a plug pull, but the method is important.

Get the car up to operating temp and run it hard and steady, like an open freeway run or something.

Then cut the engine without having it idle or go through stop and go traffic. This is somewhat difficult unless you have an open track or good access to your house from an open road. Reason is, most times the car will run rich at idle and on and off accelerator action richens the mixture (acc. pump action). So in effect you want cut the engine at higher rpm to get a true reading.

 

HTH.

Tim