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#401584 - 01/11/18 09:42 AM Permite piston
CHC Offline

Shade Tree Mechanic

Registered: 03/22/16
Posts: 63
Loc: PA
Can anyone confirm that the Permite piston #1016 is correct for a 34 207? Can not find a Permite catalog for reference.
Thanks,
Chuck

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#401595 - 01/11/18 01:33 PM Re: Permite piston [Re: CHC]
Chev Nut Online




Registered: 01/08/02
Posts: 24980
Loc: West Allis,Wi.
The standard size 1929-1936 piston will measure 3 5/16" in diaemeter and the wrist pin hole will be one inch. That and the distance from the wrist pin hole to the top of the piston are the only important demensions. Also the ring groves should be
Oil ring .186" wide
The two compression ring grove 1/8" wide providing they used Chevrolet demensions and all aluminum pistons I used had those 1935-1936 demensions.
_________________________
Chevgene

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#401634 - 01/12/18 10:27 AM Re: Permite piston [Re: Chev Nut]
CHC Offline

Shade Tree Mechanic

Registered: 03/22/16
Posts: 63
Loc: PA
Chev Nut, once again thank you very much! You are a wealth of information. If we ever meet up at an event, lunch and beverages are on me!
Chuck

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#401660 - 01/13/18 07:16 AM Re: Permite piston [Re: CHC]
Chev Nut Online




Registered: 01/08/02
Posts: 24980
Loc: West Allis,Wi.

If it is determined that the pistons are correct for a 1929-1936 engine you will have to know what size they are. For some brands the standard size is not stamped but if oversized the top of the piston will be stamped with .020" -.040" Etc.
If the piston is measured the demension would be from side to side and not front to back because most good pistons are cam ground out of round to control expansion.
I am a big fan of aluminum pistons especaily on 1934-1936 engines due to the higher RPM'S these engines are usually driven. The lighter pistons take a lot of load off of the connecting rod bearings.
_________________________
Chevgene

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#401693 - 01/13/18 02:36 PM Re: Permite piston [Re: Chev Nut]
Chipper Offline




Registered: 11/22/01
Posts: 16624
Loc: The Great State of TEXAS
While it is true that aluminum pistons will reduce the weight on the end of the rod it may not significantly reduce the force on the rod. The weight of the piston as well as friction of the piston and rings also effects the force on the rod bearing. I have found that engines that were designed for cast iron pistons seem to run smoother with cast iron pistons. I use cast iron pistons in the engines I rebuild. Yes, I understand that I am in the minority.
_________________________
How Sweet the roar of a Chevy four!

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#401703 - 01/13/18 04:24 PM Re: Permite piston [Re: Chipper]
Junkyard Dog Offline




Registered: 11/23/01
Posts: 28607
Loc: Eagle Point, Oregon
Quote:
I have found that engines that were designed for cast iron pistons seem to run smoother with cast iron pistons.


I have found the same to be true also, especially when the engine is balanced.


Quote:
I use cast iron pistons in the engines I rebuild.


Cast Iron pistons are all that I will use as well.

laugh wink beer2
_________________________
The Mangy Old Mutt

"If It's Not Junk.....It's Not Treasure!"

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#401707 - 01/13/18 04:48 PM Re: Permite piston [Re: Junkyard Dog]
Chev Nut Online




Registered: 01/08/02
Posts: 24980
Loc: West Allis,Wi.
My '34 engine was very smooth and more flexible (gained speed easier) due to less weight to get moving.
So there are pros and cons of both materials.
_________________________
Chevgene

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