Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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#401584 01/11/18 01:42 PM
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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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CHC #401595 01/11/18 05:33 PM
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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.


Gene Schneider
Chev Nut #401634 01/12/18 02:27 PM
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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

CHC #401660 01/13/18 11:16 AM
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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.


Gene Schneider
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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!
Chipper #401703 01/13/18 08:24 PM
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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




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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.


Gene Schneider
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My Permite Catalog from 1935 Shows only Cast Iron Pistons for 1934 Chevrolet. The number is 2340P.

Mike


ml.russell1936@gmail.com

Many miles of happy motoring
CHC #402530 01/26/18 08:38 PM
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If the weight of the aluminum piston is say one half of the cast iron piston, the acceleration peak force will be cut in half. I think that is a pretty fundamental fact.


My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .
old216 #402537 01/26/18 09:47 PM
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Actually the fundamental fact is that the piston, pin, retaining bolt, rings and rod assembly all contribute to the force. Also the force is modified by the friction of the assembly as it moves in a cylinder.


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CHC #402538 01/26/18 09:56 PM
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That is true but the force of friction is much less then the accelerating forces of the piston and assembly. Reducing the weight of the piston directly affects that force.


My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .

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