Sleeved cylinders = different carb jetting?

[mwking]

Hi,

I had another post where I looking for the cause of a meltdown my '82 440 Trailfire had last weekend. It has a sleeved PTO cylinder and that is the cylinder that melted down. A pressure test after the meltdown was good, the fuel pump impulse line is good and the carb was cleaned last month and is jetted to stock specs. I was talking with BigDanno1970 the other night and something he mentioned got me thinking. It was a cold night last Saturday, probably getting close to the 0 F, -18 C were the jetting would change from the stock 230 main to a 240. Dan commented that the sleeved cylinder would not likely dissipate the heat as well as a stock chromed cylinder. So would that plus a cold night explain why the meltdown occurred? Would a sled with sleeved cylinders require a richer jet at a higher temp to compensate? If anybody else has some experience with running sleds that have had sleeves I would appreciate knowing how you have made out and what tuning if any you have done. I have the engine back together with a decent chromed pto cylinder, but I am seriously thinking about putting the 240 jet that I have in the carb until I am sure this thing isn't going to run lean and burn down again.

Thanks,

Murray

[Checkmarks]

Murry,

I would not think the sleeved cylinder made any difference. Just the luck of draw which seal went south. Are the seals new installed by you or a close friend? What did the plugs look like prior to the meltdown.

If the seal in the mag side went down would you ask yourself the same question in reverse? A person MUST change jetting in accord with the temp/alt... The alternative is get FI or that Hultzman variable jetting system. It is a pain changing jets or just ride in 20 degree weather.

[mwking]

Checkmarks,

The thing is neither of the seals went out. The motor pressure tested fine. So it was lean on that cylinder only without any help from a leak after running two seasons without any apparent problem.

Murray