VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1912-1928 Aluminum piston in 1928 engine. (Need help)

I have five old cars that are in the VCCA that have been running great for decades. Going on a long trip and back is no problem for them. I don't trailer my cars anywhere....I drive them!

Pickup man,
Are you saying then the split goes toward the camshaft and the solid side toward the carb/intake ?

Sorry , I'm still confused. Read this :

http://www.totalseal.com/howdoo.html

Ring Terminology H and I.

H. Major Thrust Face: The side of the piston carrying the greatest thrustload. Looking at the piston from the front in an engine rotating clockwise, this is the left side.

I. Minor Thrust Face: The side of the piston opposite the major thrust face.


I'm 60 now and things take longer to
understand-


From Norway :confused: Arvid :confused:

LOL, Arvid, 60 isn't old; you're just getting the hang of it. It's simple; that is if you would speak Dutch, now I have to look for the words or make a drawing. I did both. On the down stroke the "big end" stands under an angle and in order to bring the force down to the crankshaft there has to be a horizontal force to even it out, the further down the piston goes the higher the horizontal force will have to be. O I wish I could write English, I guess the picture will have to explain.
And that's why bore and stroke among other things will determine the time your engine will last.

regards
Richard

In all the Mason design and built Chev 4 engines built from 1912 to 1918, the crankshaft is offset 3/8 inch to the intake side to decrease the piston thrust on the power stroke. This same 3/8 inch offset feature continued with the 1918 Chev 4's thru 1928 production. So the intake side was and is the thrust side - so the 1928 Chev Repair manual is correct with the piston slot towards the camshaft.
KenK

Hello Richard, KenK, 35 pickup man and others.

Nice drawing Richard, I think it's very like mine?

The 3/8 " offset was interesting KenK. My be this is the key for me to understand why the trust side is on the intake side?

But my Englich are miles away to read,explain and take part of a discussion like this.

So , from now, I will use all my time to my butterfly collection

Have a nice day

Best Regards Arvid :)

Arvid, if I don't have any trouble understanding your printed words in English-Chevrolet language I think most everyone understands it also.

Just be careful that you don't mistake a mad hornet or bumble bee for a butterfly out in the outdoors, even butterfly collecting has it's dangers!

OK MrMark.
I understand. When I don't see difference in pressure side and no pressure side,the danger to take a hornet or a bee for a butterfly are extreme high. My be old cars are safty anyway. :)

Regards Arvid

Hi Arvid, I'm not giving up on this one, but I can only solve it on my own way and that is calculating the forces that occur during a cycle. And for that I would like some measurements. I made a drawing to explain which ones I need. Would you be so kind? I don’t have my engine apart yet. I don’t need them four digits precise, just to get the global measurements. Thank you.

Ok Richard.No problem.
Let me know what measurements you need, and I can take it for you.(In millimeter ,not inch)

One other way is to take some of the 11 engines block and measure the abrasion on the intake and cam sidewall. But for the movement I don't have proper measuring equipment.

Regards Arvid

Just the measurements A to E then I can figure out if the piston wants to tilt and how high the forces might be. (compared to the force that pushes the piston down)
Thanks, I like puzzles.