Kevinfxst 3 #1 Posted February 21, 2022 Can anyone on here explain why the new style mahle piston has the wrist pin offset from center and the old style cast piston has a centered wrist pin ? and are the wrist pins a different diameter ? 1 Share this post Link to post Share on other sites
Achto 27,751 #2 Posted February 21, 2022 Intrigued, and would like to hear the input on this. I would not think that there would or should be a difference. Are you sure that you received the correct piston? I have received incorrect parts that were in a correctly marked box. 2 1 Share this post Link to post Share on other sites
Kevinfxst 3 #3 Posted February 21, 2022 The new style mahle pistons have a arrow that points to the flywheel side they are only to be installed with the arrow pointing to the flywheel side , old style piston can be installed either way the wrist pin is centered my question is why did it go from being centered to the wrist pin being offset ? Share this post Link to post Share on other sites
TJ5208 1,824 #4 Posted February 21, 2022 10 minutes ago, Achto said: Intrigued, and would like to hear the input on this. I would not think that there would or should be a difference. Are you sure that you received the correct piston? I have received incorrect parts that were in a correctly marked box. You can't always count on what you look at. And I know a lot of people on here would probably like to see what they're buying before they buy it. Share this post Link to post Share on other sites
ri702bill 8,487 #5 Posted February 21, 2022 Piston pins are sometimes offset to give more torque output on a small motor - 1980's GM 4 cylinder Iron Duke motors are a good example. The only drawback is that design places a lot of side load on one of the piston skirts and tends to wear the cylinder bore egg shaped. That is what happened to my 1980 Chevy Monza wagon. Bill 1 Share this post Link to post Share on other sites
ebinmaine 68,285 #6 Posted February 22, 2022 2 hours ago, Achto said: Intrigued, and would like to hear the input on this. I would not think that there would or should be a difference I'm under the impression that the only Kohler big block engine well known for an offset piston is the K341. Notwithstanding that... I wouldn't be prone to replacing one with the other unless a highly trained engine builder recommended doing so. 1 Share this post Link to post Share on other sites
Kevinfxst 3 #7 Posted February 22, 2022 yes the standard cast piston is offset do to the bore not being centered with the crankshaft in the K341 16hp. , but the new style mahle for the K321 14hp is also offset to just wondering why Kohler went to the off set wrist pin for the new style mahle pistons in the 12 , 14 also ? I have a mahle piston for a K321 14hp. 3.500 bore and the wrist pin is offset on it to Share this post Link to post Share on other sites
