"thenewguy" Posted March 3, 2004 Report Posted March 3, 2004 i was wondering how i can measure if the engine has been bored or if its still the orignal bore. i know it has new high compression pistions but i want to know what size a stock bore is. are you may have noticed i have no clue what im talkin about. lol, if anyone knows anything that would be great. thanks Quote
sredish Posted March 3, 2004 Report Posted March 3, 2004 i was wondering how i can measure if the engine has been bored or if its still the orignal bore. i know it has new high compression pistions but i want to know what size a stock bore is. are you may have noticed i have no clue what im talkin about. lol, if anyone knows anything that would be great. thanks You need a caliper gauge to measure the interior of the cylinder for the bore size. I don't have the spec on what the size of the standard bore is. I should know it, I don't. Just measure the diameter of the cylinder and that will tell you exactly what you've got. You can pick up a caliper gauge at most auto parts stores. Quote
die_infidel Posted March 3, 2004 Report Posted March 3, 2004 Some pistons have a oversize number stamped on the piston head. Usually in thousandths over. You would have to take head off to check. If not than measure the cylinder's diameter in mm's, stock diameter is 64mm. Then turn the crank until piston is all the way down and measure from top of cylinder to piston head in mm's, stock stroke should be 54mm. Quote
"thenewguy" Posted March 3, 2004 Author Report Posted March 3, 2004 i have vernier calipers so that wont be a problem. i just dont know how many inchs 54mm and 64mm equils. maybe i can find a chart some where on here. thanks Quote
boonman Posted March 3, 2004 Report Posted March 3, 2004 64mm is equal to 2.5216" or so. 54mm is equal to 2.1276" or thereabouts. Stock bore size is 64mm. And I doubt that you have high compression pistons. This isn't a car engine. We don't talk like that. Most likely you either have stock pistons, or Wiseco's. SOme others are out there, but not used very often. Evvery stock piston I have looked at has "1UA00" cast into the piston on the inside of the exhaust side. If you follow what I'm saying here. Intake side of the piston has the "windows" cut into it. The exhaust side is solid. To properly measure the bore, you wll need some snap guages and a micrometer. But, a good set of vernier's will do the triick and get you close. You just won't be able to get in there and measure if it's oblong and what not. but if you just want ot know what bore it's on, you will be able to do it..... Quote
Ducman Posted March 3, 2004 Report Posted March 3, 2004 (just to clarify) Get a measurement in inches and multiply that number by 25.4 to convert to mm. Quote
boonman Posted March 3, 2004 Report Posted March 3, 2004 Or, you can get your measurement in English, and divide it by .0394 or, get the metric measurement in millimeters, (mm) and multiply it by .0394 The universal number for metric conversion. you can go either way with it. Quote
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