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How much PSI is a triple enigne supposed to have?

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  #1  
Old 06-06-2008
westman995
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Default How much PSI is a triple enigne supposed to have?

Ok just wondering how much compression should be on an older triple 600 engine. This guy is trying to tell me 60 psi is ok for each cylinder.. That sounds low as hell for any engine, Isnt it supposed to be around like 125 for good compression?


He told me some guy told him he checked it and got that and the guy said taht was good compression, he just told me that guy wasn the wisest. I am having second thoughts about this engine now. I cant drive over 1.5 hours just to check the compression on this thing and the guy doesnt have a comression tester..

Its a 87 indy 600 triple..

I dont know if i should take the chance on this.. i want the thing but if it doesnt have good compression its worthless to me, i dont have the money to rebuild the whole top end

Last edited by westman995 : 06-06-2008 at 10:31 PM.
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  #2  
Old 06-06-2008
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I think 125 is the norm, 60 sounds way too low
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  #3  
Old 06-06-2008
westman995
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Ya i was thinking atleast 125.. I was 99% positive that was way low but i wanted to make sure.. My 440 fanner has 125 compression so i knew it had to be like around that.. Well if i can get him to confirm it has better compression than 60 psi i will pick it up, if not i cant take the risk buying it. Is it possible it just needs new rings or something? Or most likely a whole top end redone or replaced?

I told him i cant risk buying it if it doesnt have good compression and that if he can confirm to me that it has good comression i will drive there and buy it from him. He said he would see if he could find a tester and show me pisc with the tester on each hole.. So we will see what happens i guess..

Damn i really wanted this engine.. I hope it turns out to have better compression..

What is the least compression acceptable? Is 100 psi "OK"? If so im thinking maybe it could be better with new rings but i dont know all that much about engines so i need some advice about that..

Last edited by westman995 : 06-06-2008 at 11:12 PM.
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  #4  
Old 06-09-2008
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Best would be between 100/125 as a minimum.
It is entirely possible that the doof doing the testing has no idea how to do it right.
You can get 60 psi with one pull, but you need 3 or 4 to get a proper reading. (I always pull 5 to be sure)
If there was a way for you to get someone more reliable to do the test..........
Otherwise, it's a parts engine and if you are lucky it will only need rings.

Some people claim that a triple will run well with 90 psi.
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Old 06-09-2008
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Wow, that would be a bitch to start if it would even think about running...
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  #6  
Old 06-09-2008
westman995
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Quote:
Originally Posted by Triple650indy View Post
Wow, that would be a bitch to start if it would even think about running...
Ya he said it ran good tho.. So i dont know..

Quote:
Originally Posted by OCR View Post
Best would be between 100/125 as a minimum.
It is entirely possible that the doof doing the testing has no idea how to do it right.
You can get 60 psi with one pull, but you need 3 or 4 to get a proper reading. (I always pull 5 to be sure)
If there was a way for you to get someone more reliable to do the test..........
Otherwise, it's a parts engine and if you are lucky it will only need rings.

Some people claim that a triple will run well with 90 psi.
Thats what im thinking happened, The guy doing the test prolly only pulled it over once haha.. I dont know but i dont think im going to buy that sled anymore..
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Old 06-09-2008
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Hold the throttle WFO and pull until it doesn't rise anymore.

60 is way too low.

100 in minimum to start somewhat easily.

Buy your own guage. Even a cheapo one will get you by, it'll at least tell you when your compression starts to drop. Make sure you buy one that THREADS into the head, not one of those hold-on ones.
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Old 06-09-2008
westman995
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Quote:
Originally Posted by Ibreakstuff View Post
Hold the throttle WFO and pull until it doesn't rise anymore.

60 is way too low.

100 in minimum to start somewhat easily.

Buy your own guage. Even a cheapo one will get you by, it'll at least tell you when your compression starts to drop. Make sure you buy one that THREADS into the head, not one of those hold-on ones.

Ya ill have to see about getting one of those, it would be nice to have around too. We do have one of those hold on ones, its an older one, But it works OK, I used it to check compression on my 440 fanner just for the hell of it. It read 125 psi both holes, So it works ok..
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  #9  
Old 06-09-2008
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Quote:
Originally Posted by Ibreakstuff View Post
Hold the throttle WFO and pull until it doesn't rise anymore.
most people forget that part. You need to draw air in to compress it. It will still work if you don't but will require a lot more pulls possibly.
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1997 XLT SP -------- SLP triple pipes
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  #10  
Old 06-09-2008
westman995
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Quote:
Originally Posted by Polaris_Nut#1 View Post
most people forget that part. You need to draw air in to compress it. It will still work if you don't but will require a lot more pulls possibly.
Ya i didnt hold the throttle open when i checked my 440 fanner, but it still read 125 psi, not sure how many pulls it took, i didnt count, I would check it again but its not in the sled anymore..
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  #11  
Old 07-25-2008
mach1
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125 is good but youll start fouling more plugs ,i usuelly rebuild mine if they get below 130,i look for 145-150 range,and if one less then 10% diff from the others time for new rings,or top end rebuild.
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