Awesome info, thanks! Had no idea pistons for bored cylinders were stamped on top. 
what is it?
Thread Starter
TECH Regular
Joined: Sep 2006
Posts: 447
Likes: 0
From: Houston
what is it? So i recently aquired a built motor..... long story short i want to go to a shop to see what the bore and stroke are without dissasembling. any suggestions in the houston area?
theres a number of diferent ways, measureing the volume of air in the cylinder is the easyest. they screw into the sparkplug hole and turn the motor over and then use that info to guess the displacement, the bore and stroke.
can also take off the oil pan mic the bore and get the part number off the crank
can also take off the oil pan mic the bore and get the part number off the crank
theres a number of diferent ways, measureing the volume of air in the cylinder is the easyest. they screw into the sparkplug hole and turn the motor over and then use that info to guess the displacement, the bore and stroke.
can also take off the oil pan mic the bore and get the part number off the crank
can also take off the oil pan mic the bore and get the part number off the crank
TECH Addict
Joined: Mar 2009
Posts: 2,099
Likes: 3
From: Texas/Afghanistan
can't u just get a hold of the previous owner/builder?
If you are dong this for the first time...how would you know exactly what the bore was? I've seen people take a dial bore gauge and rock it back and forth, and also higher up the cylinder and in the middle of the cylinder. how do you know what the actual bore is as opposed to taper?
otherwise, check the middle cylinders, 3,4,5, or 6, mic the bore from the front to back, ( the crank will push, and consequently wear the cylinder bore in the direction of side to side way more than front to back ) and do it as close to the head surface as possible MINUS THE LAST QUARTER INCH. the piston typically will not wear that last lil bit at all, its called Ring Ridge, and you dont want to mic that area.
The pistons will (should) also be stamped on the top if there over, itall say ".030" or whatever its suposed to be bored. if its not been bored it wont say anything
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