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Come
:

pression - gone !?

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Tugboat

01-09-2000 07:11:11




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I've got a Model R pony motor that is hard to start.(hot or cold) I checked the compression and got about 60 psi on each cylinder. Can anyone tell me what the compression should be? I've started pulling it apart and find that the valves are carboned up but the sealing surfaces don't look bad. Plan to do valves and maby rings if that makes sense. It smokes a little (blue)when running. Any suggestions?

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Gerald J.

01-10-2000 07:55:18




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 Re: Come - pression - gone !? in reply to Tugboat, 01-09-2000 07:11:11  
Do rod bearings when you do rings. Old rod bearings will be as worn as the rings and may not handle the load of the new rings.

Gerald J.



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Moye

01-09-2000 17:54:37




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 Re: Come - pression - gone !? in reply to Tugboat, 01-09-2000 07:11:11  
Tugboat, keep us informed on how you make out. I have an R that may need the same thing soon. Moye



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twopop

01-09-2000 12:53:45




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 Re: Come - pression - gone !? in reply to Tugboat, 01-09-2000 07:11:11  
your compression should be between 90 and 120 lbs.but the engine should run with 70 lbs. the blue smoke is from burning oil this oil will also raise compression do you know how to do a wet dry test? the tests should be made with trottle wide open



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Tugboat

01-09-2000 13:51:49




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 Re: Re: Come - pression - gone !? in reply to twopop, 01-09-2000 12:53:45  
It seems like the throttle is always open on this pony. It idles at 4,000 rpm. I am not familure with wet dry testing but I removed both plugs and cranked it with a fresh 6 volt battery. It gave me 60 psi on both cylinders,twice. I have just completed removing both heads, the intake, and all of the linkage and bolts that hold it in place. Plan to do rings and valves. Project is stopped until next Saturday. My job gets in the way! What do you think about the way I am going about this? Tugboat

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twopop

01-09-2000 14:34:48




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 Re: Re: Re: Come - pression - gone !? in reply to Tugboat, 01-09-2000 13:51:49  
looks to me like you are going about this just right. have you checked the cylinder walls yet to for wear,you will probably need to bore the cyl.you need to find out why it runs at that speed, the one i have idles at 600



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Tugboat

01-09-2000 16:32:09




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 Re: Re: Re: Re: Come - pression - gone !? in reply to twopop, 01-09-2000 14:34:48  
The cylinders look to be in great shape and there is hardly a ridge to ream. According to the manual this pony idle speed and full load speed is the same at 4,000. The governer does a fine job of keeping it there too. It can be slowed down by pushing the governer linkage but returns to 4,000 when released. Thanks for the help! Tugboat



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CLOONEY

01-09-2000 07:18:15




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 Re: Come - pression - gone !? in reply to Tugboat, 01-09-2000 07:11:11  
Tugboat, I don't know squat about an "R" pony motor, but I do know physics. If the air can't get in you can't compress it. If those valves are carboned up REAL BAD its kind of like doing a compression test with the throttle closed.



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Tugboat

01-09-2000 07:27:00




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 Re: Re: Come - pression - gone !? in reply to CLOONEY, 01-09-2000 07:18:15  
There is some carbon but not as much as I may have implied. Thanks.



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