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Joined: Mar 2016
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Mar 2016
Posts: 139 |
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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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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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
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Joined: Mar 2016
Posts: 139
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Mar 2016
Posts: 139 |
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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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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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!
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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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. I use cast iron pistons in the engines I rebuild. Cast Iron pistons are all that I will use as well.
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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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
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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 .
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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.
How Sweet the roar of a Chevy four!
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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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