Quote:
Originally Posted by ventoman
Today I rounded up a compression tester. It confirms that the compression is indeed on the low side. That's ok because now I have a good reason to get the BBK and pipe I have wanted to do. It is sort of interesting how much temp changes can affect how an engine will run. My take is that as temps decrease,metal contracts,thus increasing clearances between the piston rings and cylinder walls. In my case once that happens when the temps are a certain point my compression goes away through the increased clearances causing a not enough compression to run. I may not be right but it is the only thing I can think of right now.
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I think you are correct. I have found that when the temp drops below 30 degrees..I cannot press out wristpins from pistons to do a rebuild or BBK for a customer. I have to turn the heat on in the shop and then they slip right out. When replacing crank bearings I heat the cases and freeze the bearings and the glide right in. Trying them both at room temp..they will not fit in. Also a note on 2T engines and cold weather. Pull your oil line at 70 degrees and the oil runs like water..pull it at 30 or below and the oil barely drips out..it's almost like honey. Which means you could also get dry starts and runs if the pump cannot move the oil. I never have this problem with synthetic 2T oil and in fact it flows like water even at 10 degrees or so outside..which is why I use it in my Scoots and Snowmobile.
