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question for boatin bob

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rcahill31

Regular Contributor
Bob, when one uses the dwell meter after your points and etc. are replaced is there a certain engine rpm used to read the dwell deg.?
 
rcahill31 said:
Bob, when one uses the dwell meter after your points and etc. are replaced is there a certain engine rpm used to read the dwell deg.?
Click to expand...
I'm not Bob, nor do I play Bob on TV. But I can pretend to be Bob for a mintue here. :)
No offense, Bob!

I can tell you that setting dwell at/around idle RPM should cause no change intrinsically.
You may see a change to dwell at higher RPM, but we are not setting dwell at anything other than low RPM.


Dwell is nothing more than the coil saturation duration of a given cylinder's total dedicated points cam angle measured in Degrees.
IOW's, a V-8 points cam offers a total of 45* (360 divided by 8 = 45) for one cylinder's worth of coil saturation and field collapse! (I.E., spark)
If dwell is 31*, that leaves 14* open.

Things that may affect, or change, dwell angle may be a weak points spring, or distributor shaft wobble due to worn bushings, etc.
If this occurs, you may see a more progressive change to dwell as RPM increase.
If severe enough, you may see this at low RPM.
It's a good sign that your distributor needs attention and/or replacement.

I know that's more than you asked for, but I hope that helps.
 
Last edited:
Thanks Rick!!!

Couldn't have said it better myself...infact I wouldn't have said it that well. It would have been something like at idle or around 600-650


By the way...my toes are just fine :D:D:D
 
Bob, thank you for confirming that, and glad that your toes are OK. :)
I wouldn't have cared if you had done same had I been "pinged", and you jumped in!
We're all here to help!
 
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