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Discussion in 'The Garage' started by foolhardy, Jul 11, 2005.
yay i got a tach it is one ofthose ones that clamp around the spark plug wire
That is a Inductive-pickup type, i assume it has a switch to allow for 4,6 or 8 cyl. operation...?
im confused- why would that matter? doesnt 1 rev = 1 rev
yes it does it was worth the 40.00 and it looks cool on my dash
Yes.......and no, a V-12 fires a plug every 30 degrees of crank rotation, V-10 every 36 degrees, V-8 every 45 degrees, V-6 every 60, I-4 every 90......
so you need a compensation circuit for each motor arrangement
if it is going off the sparkplug wire instead of coil- wouldnt it always be the same figure it would be same as a timing light in sorts always ticking same spot and counting tick give u RPM. sorry im little slow maybe and have never messed with a other then factory hookup tach- excuse my ignorance
still not understanding was the point now that i have stolen the thread
it only fires one plug once per revolution, (unless youve got waste spark DIS)...... if you put it on the #1 plug..... every time it fires.... that's one rpm, regardless of engine setup (I4, V6, V8,V12, etc.)
if the induction is on the coil wire, then yes, you need the compensation for engine setup because you are picking up spark for every plug, not just one.
<whew> thats what i thought, originally it was said for spark wire, was getting worried - got the big 30 around the corner and senility knocking on my door
I know what ur feeling bro........I'm pushing 50 n holding....
Thank you for the correction, i confuse myself frequently.
Taking into account the cam rotates at 2:1 with the crank or half-speed so the first revolution of the crank 1-8-4-3 second revolution fires 6-5-7-2
I hope i got it right this time, it is difficult to place words outta what i'm thinking sometimes
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