Using a dwell meter on a VAC

WK-WA

Member
Points at .020, what would the dwell range be? Bought a Sun (scope) tune-up machine some time ago and now starting to play with it. Thanks, Wayne
 
I think the 30 deg was for 8 cyl, only engine I used a dwell meter on was chevy. 4 cyl may be more like 60 deg??? Been too long ago for my decrepit memory, I could be way out in left field here.

Joe
 
I also meant to tell you to set the points first, then the timing. If you change the point setting, you change the timing. ALWAYS set the points first.
 
Ahh yes, now that you mention it, the scope had different settings for 6 and 4 cylinder engines. Too many years ago...guess some things flee the memory. Sorry for the error.
 
(quoted from post at 06:27:41 09/03/18) Joe has it
30-8 cyl
40-6 cyl
60-4 cyl
These will get you real close.
For a 4-cylinder use 50. You may not have a 4-cylinder setting so read the 8-cyl scale and double it, so look for 25 on the 8-cylinder scale to get 50 degrees on a 4-banger motor. Never did it but the same should apply for a 3-cyl, double the 6-cyl scale reading. I'd love to have an old obsolete ignition 'scope but people seem to think they're still worth large bucks.
 
Thanks to all for the reply?s. The scope isn?t something I needed, but something I had always wanted and at the auction, for $75, I couldn?t pass it up. It?s a model 1015, vintage in the mid ?70?. The biggest problem was finding a manual (got one) and then trying to understand what the scope (up and down lines) means. I guess at 80 one is not to old to learn something new. Thanks again, Wayne
 
Just real quick--"parade" display is very good at seeing differences between cylinders, for instance if one peak is much higher you probably have a bad plug wire, much lower a fouled plug etc. "Stacked" lets you see wobble in the distributor shaft or a worn points cam, the "stack" won't be even.
 
I used a Sun TUT 1015 in school in the late 80s. Dad had a 67 cornet convertible. Was able to tune it till you couldn't hear it or feel it running. You had to look at the fan to see it running. Came back from the navy it was running like crud, dad said he had to mess it up because mom kept hitting the starter thinking it had stopped running.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top