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Unread 06-26-2017, 12:21 PM   #1
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Default 90psi Compression Enough?

I checked compression on my new cart last week. One cylinder showed about 155psi, and the other only about 90 or 95psi. I thought 155pis seemed pretty high, but is there such thing as "too much compression". On the other hand, I thought 95psi was too low. I'm thinking closer to 120psi is what I want. Am I close?

I'll dig into it and check the valve seats on the bad cylinder one of these nights. Any other suggestions out there?
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Unread 06-26-2017, 01:04 PM   #2
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Default Re: 90psi Compression Enough?

155 isn't and issue 90 is on the other hand have you set valve lash?
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Unread 06-26-2017, 01:50 PM   #3
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Default Re: 90psi Compression Enough?

I have set valve lash, can't remember if it was before or after checking compression. I'm thinking it was after, so I better recheck compression first. When I did the valves I couldn't get my feeler gauge in a single one of them, so I wouldn't be surprised if fixing that didn't fix my compression.
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Unread 06-26-2017, 02:09 PM   #4
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Default Re: 90psi Compression Enough?

That could be when they are tight valves won't seal properly
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Unread 06-26-2017, 03:21 PM   #5
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Default Re: 90psi Compression Enough?

Ok I'll put the gauge on the motor tonight and report back. Thanks for the help Spicy
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Unread 06-26-2017, 07:45 PM   #6
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Default Re: 90psi Compression Enough?

Setting the valves is easy and free. Bad compression once you get them set correctly will be a little more costly.
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Unread 06-27-2017, 08:13 AM   #7
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Default Re: 90psi Compression Enough?

I've got 160+ in each cylinder. I must have checked it before setting valve lash. Thanks for the help fellas!
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Unread 06-27-2017, 09:18 AM   #8
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Default Re: 90psi Compression Enough?

there is never too much compression however if you get around the 260 psi range it makes turning a motor over a little complicated and if you get higher than that they don't like regular gas
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Unread 06-27-2017, 09:35 AM   #9
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Default Re: 90psi Compression Enough?

Quote:
Originally Posted by country1982country View Post
there is never too much compression however if you get around the 260 psi range it makes turning a motor over a little complicated and if you get higher than that they don't like regular gas
Got it. Hopefully I don't have to worry about hitting 260psi... Thanks for the info!
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