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I'm doing some sand cast pattern making and I'm looking for something that I could pour over an existing part so that when it hardens it would expand instead of shink. The reason is that when you cast aluminum it shrinks, about 1.3% therefore your patterns need to be that much bigger. It follows...

Wow steve! Thanx, The manifold I'm designing is going to be a compromise of several things anyway, but I feel more comfortable when I know what I'm compromising and what I'm not. jm

Interesting Pat; however, as I understand the Blair article (It really is worth the read, only a couple pages), the bell mouth or trumpet works to *increase* the strength of the reflected pulse and ram tuning, not just steady state. He also gives a very detailed description of the "best" shape...

If I may play devils advocate: We're sucking through the trumpet. Not blowing. No sound to sound like a trumpet. That also brings me to my next question: Should I put a set of bellmouths on the bottom of my carburetor going into my plenum? (assume chevy v8) The modern carbs are building them...

Nuther question for the propeller heads: Continuing with my last post and the Elliptical bell mouths as being optimal, could you just make the entire runner elliptical? This would create a "tapered" runner for the first half or so, then expand out. Also, it would act like a giant venturi...

I've been reading books, talking to masters and I'm still confused. I wanted to get some opinions from the local propeller heads. Especially Pat. http://www.profblairandassociates.com/RET_Articles.html Good info for you guys if you haven't read up. Read the bellmouth article. The Bell mouth...

My grandfather is a pattern maker for a local foundry in Grass Valley, ca and they cast almost exclusively 4130. Jason.

Norton: Machine Design - Covers the basics on how much inertia you need to hold rpm withina given range, Norton: design of machinery (sequel to the first book) Gives much more detailed info on where to put it. The first book was the capstone for my mechanical engineering bachelors and the...

Ehudson, I'm aware that most strat charge engines go homog charge at wot, but do you (or anybody else) have any idea if BSFC improves (even slightly) at wot when stratified? Regardless of power output. The main advantage of strat charge is pumping losses are waaay better but, you are running...

Another question: Does stratified charge improve BSFC at WOT over homogeneous charge?

How about all you dyno guys? What's the lowest number you've ever seen? Anybody read any articles or papers depicting < 0.35 bsfc's?

Anybody know what the lowest bsfc ever achieved under any circumstances is? (gasoline) Strat Charge or not? GDI? Thnx, Jason