Peerless dwell/tachometer

Anyone ever used one of these to check engine rpm's?

TO30 with an alternator and a negative ground.
47505.jpg
 
Something similar, yes. Red wire goes to neg side of coil, black wire to engine ground.
I remember setting dwell once, setting the timing and then set and index the distributor. If it ever didn't run
right after that, A quick look at the distributor index mark to see if it had slipped and then I knew the points
needed adjustment. Readjust the points to the proper setting and the timing would fall back into spec
automatically. Yeah. That meter pretty much made my timing light obsolete overnight. Then electronic ignition
showed up and the $150 timing light got covered in dust at the bottom of the tool box.
 
(quoted from post at 18:17:29 04/06/17) Something similar, yes. Red wire goes to neg side of coil, black wire to engine ground.
I remember setting dwell once, setting the timing and then set and index the distributor. If it ever didn't run
right after that, A quick look at the distributor index mark to see if it had slipped and then I knew the points
needed adjustment. Readjust the points to the proper setting and the timing would fall back into spec
automatically. Yeah. That meter pretty much made my timing light obsolete overnight. Then electronic ignition
showed up and the $150 timing light got covered in dust at the bottom of the tool box.

I am trying to determine engine rpm. Engine has been rebuilt and new governor needs adjusting. It sounds like it is revving up to higher rpm than it did before. Book says it should have a top end of 2200 rpms.
 
2200 RPM should be near the top. The top of your meter shows RPM. You already have it set on the 4 cyl scale.
Your governor is designed to augment the throttle under a loaded condition. It is not a speed limiting device on
this application. 2200 RPM is pretty much limited by the camshaft and carburetor. I imagine you can probably
spin it up to 2400 RPM at the most. Tachometer say's what??
 
(quoted from post at 21:59:33 04/06/17) 2200 RPM should be near the top. The top of your meter shows RPM. You already have it set on the 4 cyl scale.
Your governor is designed to augment the throttle under a loaded condition. It is not a speed limiting device on
this application. 2200 RPM is pretty much limited by the camshaft and carburetor. I imagine you can probably
spin it up to 2400 RPM at the most. Tachometer say's what??
Thanks for the help.
My throttle linkage was the problem. I put a new carb on and the linkage was allowing it to go to 2500 rpm. With it properly adjusted its at 2100-2200. So all is good. Ready to go to work!
 
That's a great meter to have!

Yes, it will function as a tach, but it also has other uses, volts, ohms, and dwell.

Having a dwell meter to set and check points is a big plus! (If yours still has points.)

Not sure what the specs are for dwell on that engine, been a few years but I'm thinking it's around 45*. The good thing about using a dwell meter is it is more accurate for setting used points. Once there is a crater/point burned into the surface, a feeler gauge will not be accurate.

But the best use is seeing the points work under varying RPM ranges in regard to distributor shaft wear. If the reading is steady, everything is good. If it changes, bounces around or fluctuates, there is a mechanical problem with the distributor.
 

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