1993 15HP compression test resulted in 136 psi & 138 psi

[909]

What is considered the highest compression possible ( new from the factory )

 

[jimmbo]

Its a 15 hp, what are you trying to get, 15.2hp?

 

[Scott Danforth]

What is considered the highest compression possible ( new from the factory )

about 120, check your gauge

 

[flyingscott]

Let me guess you sprayed oil in the cylinders before the test?

 

[909]

...what are you trying to get ...

An answer from someone who can read

about 120, check your gauge

I typically get 120-ish as well

Let me guess you sprayed oil in the cylinders before the test?

If possible, I'll run it WOT on water then test it on land

 

[jimmbo]

While you're running it, run a can of Engine Tuner through to make sure the Rings are free

 

[Crosbyman]

if it works don't fix it !

 

[909]

While you're running it, run a can of Engine Tuner through to make sure the Rings are free

That's a good idea.

if it works don't fix it !

It ain't broke. I did change the impeller, thermostat, and plugs and gear oil.

 

[jimmbo]

That's pretty good for a 15. We used to get 55 out of a 35hp on a 14ft cartopper

 

[909]

That's pretty good for a 15. We used to get 55 out of a 35hp on a 14ft cartopper

 

[jimmbo]

Just a bit of info. If you were using a GPS for speed, you have to take into account any Current there is in the water, GPS is measuring Ground Speed, not Water Speed.

 

[909]

The additional wave speed is cheating a bit.

Sort of like when women wear push up bras.

Their titties aren't that big, or perky.

 

[flyingscott]

An answer from someone who can read



I typically get 120-ish as well




If possible, I'll run it WOT on water then test it on land

Spraying oil in the cylinders and testing compression right away is a false test. If you spray the cylinders with oil wait overnite then do the compression test.