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Mikadoo 11-16-2002, 12:34 PM We have been talking about taking compression hot and cold on other threads so I tried both. I have like 147 cold and 125 hot! Quite a difference! Of course cold expands and hot contracts but should there be this much diff? Valleyman 11-16-2002, 12:42 PM Cold expands? don't think so. better think this one over again ie. heat up a stuck nut and what happens? TallCool1 11-16-2002, 01:17 PM Uh, oh.. Yeah, tire pressure increases as it gets hotter. Isn't water the only thing that expands as it gets colder? Mikadoo 11-16-2002, 04:03 PM Daaaaaaaa what was I thinking???????? :( So then why isn't the compression lower when it's cold? snodrifter 11-16-2002, 04:13 PM I would say its because the oil film is thicker that coats everything in the cylinders. Once it warms up, it gets thinner=lower compression. Formulaman 11-16-2002, 05:42 PM Wel if that one messes you up I checked mine hot and cold got the same reading on both, new gauge 125 psi, man thats alot of pulling for no apparent reason lol :D snodrifter 11-16-2002, 06:03 PM In a warm building or outside stone cold? zr9er 11-16-2002, 10:16 PM Hey Form-what did your mother tell you about pullin on things for no apparent reason? :doh: Formulaman 11-17-2002, 02:38 AM Why do you think I wear glasses,,, so when I look back I can see the cat lol zr9er 11-17-2002, 02:14 PM :blahblah: clancy10 11-17-2002, 02:45 PM You are getting good psi readings. you should be less compresion when the engine is hot due to the fact that the air is not as thick when it is cold. OMOTM 11-17-2002, 02:55 PM When the engine is cold, you have a tighter fit of the piston into the cylinder. That is what causes cold seizures in engines. As the cylinder sleeve heats up it expands, reducing the friction between piston and cylinder, that is the reason for the different alloys being used, piston= aluminum, rings=chrome molly, and cylinder coated steel. If you doubt this, try starting a sled a -50 f. RIDE SAFE | ||