Compression Testing - Too high?

[USS Neversail]

83 Evinrude 50 hp - left out for 4 yrs. - cleaning it up now. <br /><br />The carbs are now clean. Not as much gunk as I thought. <br /><br />Did a compression test 155/160 (top/bottom cylinder). That seemed a little high. I don't have any #'s to let me know if that is good or bad. Any idea's out there in expert land? <br /><br />I appreciate it.<br /><br />Jason

 

[norman158]

Re: Compression Testing - Too high?

sounds real good to me it may drop some when you run it some but i wouldnt worry about those numbers

 

[G DANE]

Re: Compression Testing - Too high?

My 40 HP 1988 sitting for 5 yrs had 148/150 i guess this is the original comp. figures.<br /><br />It needs a fully charged battery !<br /><br />Good luck

 

[USS Neversail]

Re: Compression Testing - Too high?

I just put a brand new battery on it, so got that part covered. <br /><br />Any suggestions on where to look for the factory compression #'s?<br /><br />Thanks for the input either way. <br /><br />Jason

 

[Mikael-Block]

Re: Compression Testing - Too high?

Hi<br />I wouldn't worry so much if it is 130 or 150<br />as long they are within 10%. Yours ar perfekt.<br /><br />If you whant to compare with factory messure, you have to have a precise instrument, that have been calibrated. I dont think you can compare messurement form 2 diffrent instruments.<br /><br />mikael

 

[clanton]

Re: Compression Testing - Too high?

Jonson/Evinrude did not give compression specs in service manual.

 

[Dhadley]

Re: Compression Testing - Too high?

Those numbers are good and not unusual given the port timing configuration in that motor.<br /><br />Good luck!

 

[USS Neversail]

Re: Compression Testing - Too high?

Right on, then! Sounds like all is good. Thanks to all who posted.<br />I appreciate your help.<br /><br />dhadley - what is port timing configuration? <br /><br />THANKS, All!<br /><br />Jason