Mercury 35 hp approx.1994 - compression, prop?

easten1 · #1 April 3rd, 2003, 01:30 AM

Can anyone let me know what the compression should be for my 35hp Mercury. I think it is a 1994 model. Having trouble getting enough power to get up on plane. 13.5ft Quintrex aluminium with 2 adults & 2 kids on board.

Could be propellor ??? Motor runs & starts well, just not enough oomph...

dkondelik · #2 April 3rd, 2003, 02:52 AM

'Mornin'Ian,

Sorry, can't speak to the "new" compression spec BUT!,.... As a rule of thumb,you want to see all cylinders at 100+ psi with all reading within 10% of each other.

What pitch are you running on your prop?

What is rpm at WOT?

Is this a new problem?

How long have you had this setup?

You may just be "over proped"

Let us know what you find. Lots of really sharp guys here. I sure you'll be planing out in no time.

Good Luck

HAVE FUN!

easten1 · #3 May 20th, 2003, 03:36 AM

Thanks to Klondike7 for your response. Yes, we were over propped! Have changed from a 15 pitch to a 12 pitch and going well. Have had fun fishing and even managed to catch some!