Clearance for Egge pistons?

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2013: Clearance for Egge pistons?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Katy, Texas on Tuesday, January 29, 2013 - 08:10 pm:

I had a set of Egge high compression pistons made in the early seventies. I installed them in an engine but sold the car long ago, and removed the pistons before firing the engine and selling the car. I have sold them to a buyer and he and his machine shop have asked me what the recommended clearance is on them. Being that they are fifty years old, I haven't got a clue what the factory recommendation is. I could just give him Egge's number, unless someone here knows the answer.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew David Maiers on Tuesday, January 29, 2013 - 08:31 pm:

yeah prolly should call egge, that way if they have a problem they can call them.

but i would say err to the side looser rather than tight.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Katy, Texas on Wednesday, January 30, 2013 - 12:16 am:

Come on guys. Isn't anyone using Egge pistons?


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dare - Just a little South West . on Wednesday, January 30, 2013 - 12:43 am:

all 3 of my T's have EGGE hi-compression pistons, gapping is 0.004 - 0.006 " per inch of bore, l always use the lower figure and end up with about 0.016 - 0.018" on the ring ( I also buy the next oversize ring and hand file back ).

David.

PS the cast iron pistons used a smaller gapping.


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dare - Just a little South West . on Wednesday, January 30, 2013 - 12:47 am:

Dooooh ! brain fade - that's the ring gapping, sorry......the pistons l use similar numbers 0.006 - 0.008 " ( from memory ), no slap. no jamm.

David


Top of pagePrevious messageNext messageBottom of page Link to this message  By J and M Machine Co Inc on Wednesday, January 30, 2013 - 08:30 am:

Best off to call Egge:
The reason being if they are older pistons then they would know what kind of aluminum they were made from and can suggest the right piston clearance as someone has already mentioned above.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jim Ketchum on Wednesday, January 30, 2013 - 10:59 am:

Egge recommends .003 thousandths clearance for their pistons. As far as the ring gaps they should be a minimum of .004 thousandths per inch of cylinder bore.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Anthony Bennett on Wednesday, January 30, 2013 - 08:04 pm:

I reckon .003" is a little tight for aluminium... try .004" to .005"

;)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Katy, Texas on Wednesday, January 30, 2013 - 09:04 pm:

Anthony, Jim Ketchum, who posted above you, works for Egge, or used to.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mike Walker, NW AR on Thursday, January 31, 2013 - 10:13 am:

The replacement aluminum pistons I get from the vendors have the .003" clearance printed on the box. But the local old-time (3rd generation) engine shop here always bores Model T and A blocks out to .005" more than the piston size for aluminum pistons, and they won't bore one without having a new piston in hand. They say the pistons and cylinders will be scored at .003" clearance. I've had them bore several for me, and they always came out great.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Richard Gould on Thursday, January 31, 2013 - 10:54 am:

I've had Egge pistons score the cylinder walls at .003" Rods were aligned with pistons attached. Problem eliminated when clearance increased to .005". I think Egge's recommendation is generic to all their pistons. Its too close for Model Ts IMHO


Top of pagePrevious messageNext messageBottom of page Link to this message  By Glen Chaffin on Thursday, January 31, 2013 - 12:21 pm:

Egge's spec sheet says 0.0025 clearance across thrust surfaces. That's plural. The thrust surface (one) is shown as the side of the piston. That means 0.005 or 0.025 on each side of the piston.


Posting is currently disabled in this topic. Contact your discussion moderator for more information.
Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration