Curt Curtiss Posted December 25, 2017 Share Posted December 25, 2017 We finally got to pulling the engine out of the 1933 8-105 and when we removed the pistons we were surprised. I found each of the pistons we labeled .060 over so that was ok. The strange part is they had a hole drilled in the skirt along with a "T" style slit in the sides of Pistons below the ring level. I have never seen this before, have you all seen this and what would the reason be for doing this? Link to comment Share on other sites More sharing options...
Owen_Dyneto Posted December 25, 2017 Share Posted December 25, 2017 (edited) An expansion slot to control skirt expansion, an extremely common feature found on the vast majority of pistons. Edited December 25, 2017 by Owen_Dyneto (see edit history) 1 Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted December 25, 2017 Share Posted December 25, 2017 18 minutes ago, Owen_Dyneto said: An expansion slot to control skirt expansion, an extremely common feature found on the vast majority of pistons. Right on, Owen. Ben Link to comment Share on other sites More sharing options...
Rusty_OToole Posted December 25, 2017 Share Posted December 25, 2017 Aluminum pistons expand with heat, a lot more than the water cooled iron cylinder. To avoid the piston seizing in the bore they would have to leave so much clearance when cold, that piston slap would be a problem. Instead they used various methods to allow for expansion like making the piston oval and cutting a T slot in the skirt. Other solutions included wrapping the piston in piano wire and casting in a steel strut. 1 Link to comment Share on other sites More sharing options...
Curt Curtiss Posted December 25, 2017 Author Share Posted December 25, 2017 4 minutes ago, Rusty_OToole said: Aluminum pistons expand with heat, a lot more than the water cooled iron cylinder. To avoid the piston seizing in the bore they would have to leave so much clearance when cold, that piston slap would be a problem. Instead they used various methods to allow for expansion like making the piston oval and cutting a T slot in the skirt. Other solutions included wrapping the piston in piano wire and casting in a steel strut. Very good to know, thanks! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now