youguessit

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?

brian_rs/ss

lol good luck....



btw i use g-force for just about everything.

youguessit

does g-force have the tools to check bore and stroke?

CarsandWomen

iTrader: (19)

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

demonpixel

iTrader: (19)

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?

brian_rs/ss

how did u 'aquire' this motor anyways?


can't u just get a hold of the previous owner/builder?

CarsandWomen

iTrader: (19)

well the easy answer to that is it should be close enough to a known number that it confirms it. I.E. you know the bore size of the different cube configurations and its either really close to what it should be or really not.

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

demonpixel

iTrader: (19)

Awesome info, thanks! Had no idea pistons for bored cylinders were stamped on top.