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Photo by Andy Miller, UK,
Taking a rest,
Jokulsarlon, Iceland



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  #1  
Old 10 Mar 2009
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Question TS185 ER compression ratio

Hello Hubbers,

I have a question about the compression ratio on my 1982 ts185. Stock it is 6.2:1. If atmospheric pressure is approx 14.7, i should expect to receive approx 91psi from a cylinder compression test, right?

When i test it though, i actually get 125psi. I've tested the compression gauge on an air compressor (it monitors the pressure leaving the tank), and it appears to be reading accurately. That would suggest that i have a compression ratio of approx 8.5:1.

Am i calculating this correctly, or am i missing out on something (a brain perhaps :confused1

Cheers, John.
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Old 11 Mar 2009
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That's a good question John. I'm going to cross post this on another forum and see if I can get any answers for you.

regards

Nigel in NZ
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Old 13 Mar 2009
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Thanks Nigel
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Old 24 Apr 2009
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If its any help, my 74 ts185 gets 122 PSI on the compression tester, so it would seem normal to me.

As for the ratios, I haven't a clue.

Ed
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Old 24 Apr 2009
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Yeah, it sounds like 120-130psi is a normal sort of reading. Thanks.
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Old 24 Apr 2009
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Calculate compression:
Compression=P0*C^^1.4
P0=Pressure at TDC (14.7 PSI)
C=Compression
1.4=Ratio for air

Your bike
C= 14.7 PSI* 6.2^^1.4= 189 PSI

But you will never get that high, parts of the stroke doesn't contribute to compression.
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Old 24 Apr 2009
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Thanks AliBaba! There was more to it than I thought. It's reassuring to know that my engine hasn't been 'stroked' - if it were I'd be in all sorts of trouble with timing, jetting, lubrication etc. Thanks for the handy info!
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Old 25 Jul 2009
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Compression

Well im gettin 140 psi out of my 84 TS 185
John

Last edited by TS185; 28 Jul 2009 at 05:22.
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