Pistons


The old and reliable.

Rookie
Rookie

Posts: 17

Joined: Mon Oct 17, 2016 10:20 pm

Post Wed Nov 13, 2019 11:42 am

Pistons

Hello Guys

Been awhile since I was on here. My father in law and I finally reached an agreement on what to do with the truck (and cleared out all of our other unfinished projects) and are going to start working on our KB2.
I am considering making new pistons and rods and a head out of 6061 or 7075 aluminum at work (Im a machinist and have access to CNC and manual mills and lathes) My only concern is that many older pistons were elliptical instead of round. Does anyone know if the green diamond used round pistons, or the more complicated to make elliptical?

The idea is that the lighter weight parts will lose less power to parasitic loss and allow more power transfer to the tires and allow it to get to speed more quickly. Also Itd be cool to tell people that the only parts of the motor I didnt make are the block and crank

Golden Jubilee
Golden Jubilee

Posts: 303

Joined: Fri Mar 18, 2016 9:16 pm

Location: Dallas, TX

Post Wed Nov 13, 2019 12:36 pm

Re: Pistons

pistons.jpg
Does this help.

Rookie
Rookie

Posts: 17

Joined: Mon Oct 17, 2016 10:20 pm

Post Wed Nov 13, 2019 1:23 pm

Re: Pistons

Not quite. Are your pistons still out by any chance? If so if so do you have a set of calipers or mics you could measure them with?

I'm looking for the diameter of the crown parallel to the wrist pin and perpendicular to the wrist pin

Golden Jubilee
Golden Jubilee

Posts: 303

Joined: Fri Mar 18, 2016 9:16 pm

Location: Dallas, TX

Post Wed Nov 13, 2019 4:16 pm

Re: Pistons

Sorry, mines all back together. Pulled that off of inter-web.
These guys would be the one to call and they would know all you need. https://egge.com/

Rookie
Rookie

Posts: 4

Joined: Wed Jun 26, 2019 9:04 pm

Post Fri Jun 05, 2020 3:41 pm

Re: Pistons

I have a new set of 0.030 over Pistons for the GRD214 from Egge with new rings. I broke my block during the assembly process tightening the head and had to use a different block that needed 0.040 over pistons. I bought them in late 2019.

Rookie
Rookie

Posts: 13

Joined: Fri Aug 18, 2017 7:20 pm

Post Mon Jun 22, 2020 9:53 am

Re: Pistons

I have two sets of pistons out for GRD-214s, and they're both elliptical. One set is IHC, I believe the other is aftermarket. They average 3.310" across the wide part of the skirt and 3.300" across the narrow, parallel to the piston pin. Above the bottom ring they're round, about 3.293" and below the bottom ring they're elliptical.

Hope this helps,

Wayne

Pile of Parts
Pile of Parts

Posts: 28

Joined: Mon Dec 10, 2012 12:59 pm

Post Tue Jun 30, 2020 11:05 am

Re: Pistons

Huh! Never knew there were eliptical pistons!

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