Classic SeaCraft Community  

Go Back   Classic SeaCraft Community > General Discussion > Performance

Notices

 
 
Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #18  
Old 11-25-2009, 09:17 AM
Bigshrimpin Bigshrimpin is offline
Senior Member
 
Join Date: Dec 2002
Location: Onset, MA
Posts: 2,712
Default Re: Compression Question????

Quote:
Quote:
Yea...Unfortunately

80 psi: note verticle grooves:



Pull piston: note stuck ring and more vert damage


120 psi: Cy; deglazed with hone 90% of vert grooves gone, cross hatch re-established, comp back up to 120, motor is happy again. Thes pix were about 3/4 thru...it looked a bit better when cleaned. I put in a new cly and ring kit. Rod and needle bearings too.





It dosnt make me feel good that I had to perform surgery but like Tim has said these motors are tough and basic and it didnt seem to mind the work. My motor was a nice clean motor that I aquired for cheap money before I gooned it up. I hope to get a few seaons from it still.
Now the class has my attention.
When I talked to Art @BRP tech he said that these motors left the factory at spec between 90 and 130 comp. I thought that to be strange. He said that as long as they were even that was proper spec for release.Said they matched the piston/ ring combos. My motor is 87-92 and turns 5200 light Bimini up. Should I be concerned? Anyone local have a scope?

Decarbed 30 hrs ago w/ Engine tuner thru the Schrader and then pony tank Seafoam 3 cycles. `til the forest fire smoke stopped. 930 hrs now."Pros" all say don`t worry, but I am. Always.
Thx,
GFS

Sandy - your guy is right. I've seen two 1994 200 and a 1995 225 that had 100 - 105 psi in all 6 and perfect cylinder walls. The point were I'd be concerned if you had a motor with 120 psi like hermit's 2000 225 and had one cylinder drop to 80psi from 120. I mess around with merc's so I can't tell you exactly what OMC models were higher compression. If all yours are the same and the motor runs well . . . I wouldn't give this another thought.
Reply With Quote
 

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 05:12 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
All original content © 2003-2013 ClassicSeacraft