4 replies to this topic

[Ctown47]

Hi,
I'm doing a compression test on my 2009 Summit 800R for the first time. Wondering what the compression should be in each cylinder? Also do you do it with the engine hot or cold. Any info much appreciated!!

[treeboy]

Depends on your elevation

[BDA]

Every compression tester will read a little differently

Do it with sled cold and warm

Make sure u have pulled it through several times before starting so there is some oil to help seal rings as when running

Pull through compresion at least twice so it pumps up (2 to 3 compresions in that cylinder)

Dealer said 145# at sealevel for my etech - still in break in

[treeboy]

Just got back to my computer, not using my phone.
As I said before elevation will give you different readings. 150psi at sea level (I have herd the r's are 150psi at sea level), will be less at 6000ft there is most likely some math formula for it.
At 1600ft at 115psi or around 3000 to 3500km at most i'd redo a top end.
The X ski doo team mech that taught me would do at least 8pulls to 10 cold than hot. But do all your pulls the same at wot. When you do your hot pulls make sure its good and hot, you tunnel cooler should be hot for your best result.
Take a look at dynamo joe web site, he has a really good post on there about compression and engine fitness.
Hope this give you a good start.

[TBLOOMA]

My 800R was 159psi at sea level ( did about 10 pulls )cold at the beginning of the season with 2400 miles on it