#100359, "Wiseco Piston installation question." Aug-09-06 05:27 AM by hunntyr
OK this may be completely retarded of me but I need to ask and get clarification. I have installed pistons before on a previous rebuild and the markings on the piston have always had some thing showing which direction the pistons are suppose to go. Like a little rivet or dimple forged into the pistons. I bought some wiseco's and they have the same dimple however the instructions tell me to put the offset opposite the rotation of the crank. Now if I am correct the offset is the little notch where the wrist pin goes in the pitcure below
Funny thing is, if I put it in that way the markings on the top of the piston showing which direction they are suppose to go in are opposite. Any thoughts?
#100391, "RE: Wiseco Piston installation question." In response to Reply # 0
OK, I finally got an email back from someone at Wiseco to call them. As I explained in my earlier post what the instructions reads is, "Installation of the piston offset needs to be set opposite crankshaft rotation. Example, if you viewing the engine from the 'timing side' you rotation should be clockwise or counter clockwise depending on application. Install pistons accordingly". They even have a picture describing it.
I did and I got in touch with a guy named Dwight who was pretty cool about the whole thing and he advised me that some orders that they sent out the had wrong instructions printed and appologized for any inconvienience. He explained that the off set should be going with the rotation not against it. This makes the dimple on top of the piston face the timing side as it should. He also took my address and such to mail out some promotional products for any inconvienience. I am so glad I waited to finish the rebuild until I heard something.
#100395, "RE: Wiseco Piston installation question." In response to Reply # 3
No, they were great. Very strong and no problems at all. I actually ended up spinning a bearing and breaking a rod. The pistons still looked decent after that even.
I just didnt see you question in time. I had the same issue, and was going to answer.
#100411, "RE: Wiseco Piston installation question." In response to Reply # 5
Yes it has offset pin. Which side...I dont have one in front of me at the moment. If I understand correctly even the factory pistons have a pin offset. That is why there are markings saying which side of the piston should be facing the timing side of the engine. He just wanted to verify that these were the same because the instructions are unclear.
#100414, "RE: Wiseco Piston installation question." In response to Reply # 5
Originally posted by turbo8u ok so let me get this straight for my own clarification. the pin on these pistons is offset to one side, correct? It should be offset to the exhaust side is what youre trying to say? are these stock bore wisecos?
Yes to both questions. If you look at the picture I posted, it shows on the piston where you insert the wristpin into a small notch. That is the offset I was speaking of that needs to be facing the exhaust side. Sorry for the confusion
