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Registered
Join Date: Jan 2003
Location: MESA AZ
Posts: 505
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Tach question- 4cyl to 6cyl
Provided it is hooked up correctly, would a tach from a 4cyl engine work with a 6cyl engine? Would it read incorrectly, or would it not read at all? Thanks
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1967 912 2.7 1977 MGB (bright yellow) 1985 Honda Spree Moped (great for towing rollerbladers) A flute without holes, is not a flute. A donut without a hole, is a Danish. |
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10-11-2004, 01:40 PM
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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It will not read correctly. The trigger will count the wrong number of pulses for integration.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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10-11-2004, 01:50 PM
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Registered
Join Date: Jan 2003
Location: MESA AZ
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But mine is not even twitching... so I guess I will have to assume I have a bad tach or it is hooked up incorrectly. I need to get it recalibrated, but for now I just wanted to hook everything up. Thanks!
__________________
1967 912 2.7 1977 MGB (bright yellow) 1985 Honda Spree Moped (great for towing rollerbladers) A flute without holes, is not a flute. A donut without a hole, is a Danish. |
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10-11-2004, 05:11 PM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Slater,
Do you have the tach trigger lead hooked up to the points, or input terminal 'C' of the CDI unit? Your tach will read 33% higher than a 6-cyl tach at a given engine speed ... if functioning properly! Here is a calibrator circuit that can be built from junk box parts, or less than $20 from Radio Shack ... 
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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10-11-2004, 06:18 PM
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Registered
Join Date: Jan 2003
Location: MESA AZ
Posts: 505
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Warren - You are the man! I currently have the trigger wire hooked up to the points. I have not tried hooking it up the "C" on the CDI. I have also not yet tried cleaning all of the terminals on the back of the tach, I will try that next. Thanks for the diagram, saves me from sending it off to have done! Thanks again!
__________________
1967 912 2.7 1977 MGB (bright yellow) 1985 Honda Spree Moped (great for towing rollerbladers) A flute without holes, is not a flute. A donut without a hole, is a Danish. |
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10-11-2004, 07:24 PM
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