Stuart_B
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| posted on 7/5/11 at 08:10 PM |
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pinto compression
hi all, well i have been playing with my new built pinto today, found out that it is only running on 3 cylinders, this is down to 2 things, the piston
hit the spark plugs(ops ) the pistons are a little close to the top, but i have got around that. and there is no fuel getting through the carb on one
cylinder, so a rebuild of the carbs will be on the cards.
so i did a compression check just to make sure all things was good, and got a reading across all four spot on the same, so happy with that but it
seems a little on the high side.
so just wondering what compression should a pinto be? is 200psi right?
cheers
stuart
black mk indy, 1.6pinto on cbr600 bike carb's.
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nick205
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| posted on 7/5/11 at 08:51 PM |
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Haynes book specs 11-13 bar and 13 bar is 188 psi so for a freshly built engine 200 psi doesn't seem unreasonable (the compression guage will
have a tolerance). The fact your getting such good and more importantly consitent compression is reassuring IMHO.
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snapper
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| posted on 8/5/11 at 03:09 AM |
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You can have to much compression, Burtons often have Pintos with 190psi, cam duration/overlap reduces compression.
What cam are you running?
If I get a chance I will do a compression test on mine, RL31 cam, 2.1, 10.6 to 1, if it's similar psi your ok if mine is less you may be over
compressed for cast pistons
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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Stuart_B
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| posted on 8/5/11 at 06:55 AM |
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Hi there, i am running a rl30 cam. So i think my cam has more overlap than a rl31, or is it the other way around??
If you could do a comprresion test snapper that would be great.
Stuart
black mk indy, 1.6pinto on cbr600 bike carb's.
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britishtrident
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| posted on 8/5/11 at 08:18 AM |
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Wild cam lowers compression test results.
Higher compression ratio increases compression ratio results.
Higher engine capacity increases compression test pressure.
Also atmospheric pressure and humidity both have a significant effect on compression test results.
Generally any engine that produces over 160 psi is in good enough health for normal tin top use.
180 psi is very satisfactory.
190 and above is perfect.
The tell tale result is significant imbalance between cylinders ie more than 20 psi difference between cylinders indicates a problem.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Stuart_B
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| posted on 8/5/11 at 09:07 AM |
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thanks
snapper, i am wrong again
yours have more duration:
rl30 cam duration 304° 292°
rl31 cam duration 304° 297°
stu
black mk indy, 1.6pinto on cbr600 bike carb's.
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Stuart_B
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| posted on 8/5/11 at 09:08 AM |
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ops forgot to add, sorted out the fuel issues as well, and plugs not hitting the pistons now, so she runs on all four now
and carbs have been balanced, a roughly jetted up
stu
black mk indy, 1.6pinto on cbr600 bike carb's.
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