Rich oil=Lean Burn

M

Magnumb

Active member
Hello,



Trying to trace down detonation issue on my 2010 800Ptek and I'm now thinking that my 30:1-32:1 oil mix is the root cause. Could this be possible? Will adjusting to 35:1 or 40:1 cause more fuel to enter the combustion camber?
 
T

thebreeze

Member
No. It will only cause more oil to enter the combustion chamber. The fuel system functions independently of the oiler. Pre-mix ratio will affect air fuel ratio to an extent, but only on a pre-mixed motor. Are you pre-mixing, or just referring to adjusting oil pump flow?
 
M

Magnumb

Active member
No pre-mix, using the oil pump.
But 40:1 would cause less oil not more oil into the combustion camber, correct? I was thinking this would cause more fuel to combust and more fuel=cooler burn and less chance of detonation....
 
S

snoluver1

Active member
Magnumb said:
No pre-mix, using the oil pump.
But 40:1 would cause less oil not more oil into the combustion camber, correct? I was thinking this would cause more fuel to combust and more fuel=cooler burn and less chance of detonation....
Click to expand...

Correct, 40:1 = Less oil. 30:1 is a tad on the oil rich side, but not enough to change air/fuel ratio to the point of causing detonation. Something else is going on. I would be looking closely at your crank seals. I seem to remember a known issue on one side or the other(can't remember which side) on the Ptek motors. Also carb boot issues were common on that motor.
 
S

snoluver1

Active member
Also, check out your DPM system. Now that I'm thinking about it, I seem to recall an issue with the spool valve on those things. Dootalk.com has a ton of good info if you haven't been there yet!
 
S

snoluver1

Active member
Holy cripes! 3 years later? Glad you finally got it nailed down. How many pistons did you go through in all that time?:eek:
 
M

Magnumb

Active member
It still ran, just would cut out at certain RPMs and throw a engine light once in while.
The check valve was hard to see as it was low and in-between the exhaust and engine. I just happen to look in there with a flashlight when looking for a exhaust spring in the bellypan:)
 
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