Quote:
Originally Posted by Ol' Ron
Combustion chamber shape?? Might as well get this one started. Back in the 80's when I was doing all this experimenting, I made up a wooden cylinder head and carved in a bunch of chambers after measuring most stock and aftermarket chambers. I was looking for the best flow compared to CR. I do have some pics of this somewhere. The best one was a piston with a 7 degree top and the head with an 8 deg angle. This pop up piston forced the AF into the valve area. It also allow for a very hi CR with excellent flow. I made up a piston shape with Bondo and sent it to EGGE and asked them if they could make a piston for me with enough material on it for me to machine the top. The cost was 600 dollars, which was far beyond my means.
Fast forward to 2003 and I was at Bivlle with JWL and the flathead powered Hudson. I was shocked the pistons in it. Just like the ones I had sent to EGGE and the Heads were made by Navarro. Interesting, but I'm still not sure this is the right shape. But, I still think the spark plug should be in the center of the transfer area . This creats a shorted flame front and allows for a power tip plug. Be interested in any comments, food for thought.
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This is interesting for around that same time (2003) Navarro introduced his hi flow head. It is a pop up,
slightly angled piston design. At the time, the only pistons being made for this set up were from Arias @ $1,000 a set and the heads were a $100 premium over the $675 price for a "nostalgic" set.
I balked at the price for the set up. From what I understand, Ross now is also making pistons for this set up and the price is around their normal custom piston price of $700.
From what I gather, this set up is a great compromise between flow and compression.