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Old 05-19-2019, 09:11am   #13
mrvette
Latin American Goat Roper
Barn Stall Owner #101
Bantayan Kids '13
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2 waze to measure speed, cop radar, and GPS, out of the two, I think GPS is more accurate.....I know my speedo is good till 80 witch is really 78mph.....

at 100 mph, it's really only 94 mph.....and so forth......

tach over indicated 10-15% also, proven by driving the HEI with a digital audio osciallator, driving a power transistor, running off the tach out of the HEI.....a cliplead setup, easy do, and tracked by my Tektronics Scope,

tach is from a '75+ shark, in my '72 hotrod.....so it's electronic, not cable....

and it over indicated about 4-800 rpm above 2500 rpm.....worse a higher RPM's of course.....

600 rpm idle is ten revs/second or 5 sparks/second per cylinder....50 sparks/second is really slo for the electronics.....but 6000 rpm for the engine....

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