Measuring RPM
#1
Measuring RPM
I am guessing the best way/only way to measure RPM on a flathead with no tachometer is to use an inductive meter. Does anyone have any recommendations for a test meter that works well on 6v positive ground? The one I picked up at Harbor Freight isn't cutting the mustard. Trying to dial in my carb to spec.
JB
JB
#3
You don't have to look for a 6v light, just hook a 12v timing light to a 12v battery and place the pickup on a plug wire. Also available are hand-held photo tachs, ~$12 and up. Cheaper = need to be closer to target, hard to do with a fan spinning close by so make your mark on a fan blade (providing the fan pulley is the same diameter as the crank pulley.) Trying to be on spec is fine but really not critical with old, non-automatic trans vehicles.
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farmall_7
1948 - 1956 F1, F100 & Larger F-Series Trucks
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05-18-2016 12:52 PM