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914World.com _ 914World Garage _ engine rpm mismatch...

Posted by: BGman May 22 2005, 04:21 PM

Is it completely unusual to have a 200 rpm mismatch between the dash and a stand-alone tach/dwell meter that you hook directly to the coil? My gut feeling is to believe the meter in my hand.
-g

Posted by: BIGKAT_83 May 22 2005, 04:37 PM

I've made a setup with a function generater to recalibrate tachs for V8 conversions and use it to check the tach and make sure its good before I go to the trouble of opening it up.
If you are only off 200rpm at 6K that would be better than any I've seen yet. The 7 or 8 I have done are all over the place from 5 to 20% wrong.
Most reading to high. Remember that these are 30 years old.

Bob

Posted by: ArtechnikA May 22 2005, 04:50 PM

the Crane HI-6 has a tach-calibration function - also good for calibrating a shift light.
i haven't tried a factory tach but my AutoMeter has been spot-on.

Posted by: BGman May 22 2005, 09:00 PM

Thanks Bob-
Your reply leads me to the obvious next question- if I know my tach is 200 rpm off, is there an easy way to true it? Ultimately you are right, 200 rpm is minor...BUT, if it is a fairly easy process I might give it a whirl...

Posted by: bd1308 May 22 2005, 09:21 PM

hey, are you greg from bowling green? i've been trying to call you......

Posted by: Rhodes71/914 May 22 2005, 09:34 PM

200 is not bad, mines off 1000.

Posted by: redshift May 22 2005, 10:00 PM

Mine is off exactly -200 at 5600.

M

Posted by: BGman May 23 2005, 03:48 PM

Yep that is me...sorry I could not meet up with you this past weekend. I REALLY wanted to come- but had too many commitments at church sunday morning to be able to skip. Sounds like you guys had a good time.

I sent you a PM.