Jerry Feather

Actually I suspect that the piston was specifically intended for this particular application and that is why the gap between the wrist pin bosses is so wide--in order to accomodate the intended use of standard Chevy 5.85 rods that happen to have the correct length for the change in the stroke.

The offset that results is of no consequence and the problems associated with it are a myth. Or, if you are convinced that it might be a problem, you can pay $2500 for the only rods that are supposedly compensating for it rather than those on eBay for $400, or whatever your other best alternative might be, but probaby not more that $500.

Sombody on here is making the mistake of assuming that since I have developed some plastic items for 928s that that is the only thing I am capable of doing or knowing. Big Big mistake.

Jerry Feather

blown 87

It is not the piston, it is the rod.

heinrich

Instead of acting like a schoolboy "someone assumes I don't know... that's a big big mistake"... go ahead and tell us now. What is your experience and knowledge regarding engine building? How many engines have you built? Give us details. We all know Greg's credentials. Now I call you on yours. If I am wrong, I will apologize.

John D.

This is an interesting thread.

Just posting as me - to see if we can't keep it on topic.

Best to all,

John D.

heinrich

Nice to see your venerable name here JD

Mike Simard

OK, so that's an "early" style chevy rod with offset? Isn't that slightly worse than using a centered LS rod? Not that you would be the one to say either of those were best ;-)
Personally I like to modify titanium rods to be centered in my own engine but if I didn't do that I would order some from you.

blown 87

Building engines is one thing, what you get into here is the design end of it.

John D.

Thanks, my friend...

I just read a lot - usually don't post a lot, but - in this thread - I'd sort of like to keep it on topic..?

Back to the subject at hand, OK?

Best to all,

JD

Mike Simard

No, that piston is your generic garden variety forging that must be able to fit a variety of sizes on a single forging and allow whatever small end width is needed from a variety of applications.
That 'far away post design', ugh. Don't get me started on a piston design rant!

heinrich

Of course John. After all the excellent years here, if you asked me to whistle Dixie, I'd strongly consider it

John D.

You cant' whistle Dixie any better than I can

My thanks and best to you,

John

Jerry Feather

Hi Greg. I think what you are aluding to is that it doesn't make much difference how many engines I might have or have not built, but rather how much do I know about how one metal object pushes against another with maybe even extreme force, such as about 150,000 pounds of force, and how, under actual observation they react.

My experience as a fabricator, I think, clearly trumps any experinmce of the wrenches who call themselves engine builders, because they simply have never actually seen what is going on inside the engine when the forces are being applied, whereas I have had extensive experience watching the very thing that we are talkng about take place over and over in the Hydcraulic press.

The fact that my repetition is only a few time per hour is really not much different than the hundreds or thousands of time per hour that it is taking place in the engine.

I submit that my experience trumps any that the wrenches might allege to have building an engine since they never see actually what is going on. They merely have to guess about it; and they are clearly wrong in this case!

Jerry Feather

Jerry Feather

Hi John D. Are you who I think you are? JF

SeanR

It is, he's God to the rest of us mortals.

Jerry Feather

Yes, and me too. Jf