88 yj nuttered tr trw champion truck plugs 45 gap tfi coil 8mm wires no emissions only 2 vaccum lines 4wd vaccum advance webber 38 fuel reg set at 3lbs w/mixture screws 1.25 turns out seems to run very well question w/anyones experience will i need to play w/jets, timming is advaced a little by ear, (counter clockwise is advance right) one more question any one set timming this way vaccum gauage on manifold at idle about 600rpm play w/dist until greatest vaccum then back it off until it drops by onelbs or whatever vaccum is gauaged by

anyone out there

Hello,

Have you thought about using an adjustable timing light? You can map your entire timing curve very easily. You will be able to tell when your mechanical advance starts to come in and where it ends. The same with your vaccum advance. You will know what the total timing advance is for your application. A vaccum gauge is a valuable tuning item, I see a steady 20 lbs of vaccum at idle in my 258 I-6.

Hope that helps,

Fran

I have thought about it , but i hear that every engine runs different and instead of setting the timming to the usual 8degs i thought it might be better to set by total vaccum volume for my engine setup the vaccum timming setting is an old racers trick

anyone used this method before

anyone have any more input

Im very interested in knowing if anyone has any experience at all with the last post I stated about setting timing with the vaccum of the motor

You could try the power time method. It’s easier if you have an automatic tranny. Two people makes it even easier. Basically what you do is to loosen the distributor and put a small load on the engine. Advance the dist until you hear a spark knock. Retard the dist until it just stops and then go for a ride. You should still have a little spark knock. Just keep backing the dist down a little at a time. You might have to stop 3 or 4 times to get it right. When you do, lock the dist down and your good to go. Just make sure the dist is hooked up to ported vacuum. This is how I used to get older engines to run on junk gas. I’ve also used this method on Chevy engines in which the balancer ring had slipped and you had no timing marks to go by. Hope this helps.