VCCA Home Forums GENERAL DISCUSSION New User Forum Inivar strut pistons

Would like to locate an nos or used set of inivar strut pistons.
any size would be ok, am going to sleave the case.

toms

What year is your car?

Also, for a better response you might want to post in the forum the includes your year of vehicle instead of here in "New To Chat".

Good luck with your search.

In a previous E-mail I asked about inivar strut pistons, I wanted either good (not cracked or rough) originals or NOS any size from stock to any oversize. I did not mention the year date.... that would be 1928. I'll need 4. Also for every ones information the 1928 4 Cyl. engine is a stand alone. Chevrolet was in a serious competition with Ford. Ford did not have the Model A quite ready yet so GM (Chevrolet) updated the 4 Cyl. engine. There is not much you can use from the 1928 to fit backwards to 1927 and earlier. The rocker arm ratio also went from 1:5 to 1:6 ratio, I'm also thinking the valves are different. I'm thinking my history is correct.....If not someone will remind me. (I never have understood why Chevrolet only used the engine for 1 year, I also understand the horse power was more than advertised).


Thanks

toms

The iron were more durable under some conditions. In 1928 all GM cars had ron pistons. The Invar strut used in 1928 looked just like the 235 aluminum pistons chevrolet began using in 1953.

Another wierd thing is the Canadian Pontiac in the late '30's used a bored out Chevrolet engine with aluminum pistons. The regular Pontiac engine had iron pistons until 1963 in their 6 Cyl. engine and the 8 had iron pistons til the end in 1954.

The Invar strut aluminium pistons were only used in 1928 passenger vehicles.All commercial vehicles,both 1/2 ton and 1 ton trucks used either the skeleton type or full one piece cast iron pistons.The rocker arm ratio pre 1928 was 1:1(not 1.5:1),the ratio being changed to 1.5:1 in 1928 to help increase valve opening.
Pre & early 1927 engines used valves with 1 1/2" diameter heads,the valve head diameter being changed in late 1927 to the same size as was used by the 1928's,along with the changes to the cyl head,timing gears and distributor.