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The place to discuss the R 90 S as well as the R90S Worldnet archives!
gwagoner
Posts: 43 Joined: Fri Aug 28, 2015 6:35 pm
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by gwagoner » Thu Jun 18, 2020 1:53 pm
Can anyone confirm if the tachometer ratio is 2:1 or something else?
I have a R60/2 conversion with a 1975 R90S engine and would like to add a tachn. Blue Moon sells tach's for /2 that may work and come in either 2:1 or 4:1
Thank you for the help
gwagoner
Posts: 43 Joined: Fri Aug 28, 2015 6:35 pm
Been thanked: 1 time
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by gwagoner » Fri Jun 19, 2020 6:50 pm
If anyone is interested, I hear that the ratio is indeed 2:1 from my local airhead instrument restorer.
kirkpatrick3890
Posts: 71 Joined: Fri Oct 27, 2006 3:00 am
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by kirkpatrick3890 » Sat Sep 12, 2020 10:01 pm
The stock rear drive on an R90S is a 33/11 and the corresponding tach reads W-1.112.
Not sure where the 2:1 is about that you mention.
Mac Kirkpatrick
President, VBMWO