Had pretty good success with this over the years, probably because I've always been content with original factory components in known combinations. I admit to being the sort that CJ mentions, pulling things out of a box and bolting them together.
This discussion about combustion chambers is fascinating stuff. At each end I could see the tiniest "tail" caused by the clearance between piston/cylinder, but nothing going the other direction up towards the head. The solder pieces I was using to measure "squish" were placed across the entire piston top all the way to the cylinder walls. Fortunately, I don't think I have this problem. The dome on a C piston extends all the way to the outer diameter of the piston, but I can now see how a "peripheral chamber" in the head could be created by flycutting only the cylinder sealing surface and shimming to regain proper "squish".
#SQUISH HEAD PLUS#
As Phil noted, a picture is worth 1000 plus words, and the drawing explained it perfectly. it is more likely that the next rebuild will have correct geometry without any machining. I like it because I think it is the least obtrusive. Most of the heads I have seen chose the latter solution. Ron, no disagreement, except you left out the third option: if cylinder height is too large to achieve B then you have a choice: reduce cylinder height, use a thinner base gasket, or machine the combustion chamber so that the cylinder seats higher in the head than the flat at the periphery of the piston.
The chamber is where power is made and where waste is avoided peer intently and make sure you don't leave 'pockets' around. Even if you avoid that, you'll end up pouring un-burnt fuel out the exhaust. That A volume will not burn with the working chamber flame front and given that it represents a local C/R of, what, 15:1 it may well detonate at ignition leads which benefit the rest of the chamber. Graph Paper-dims.jpgThe area circled A on the right shows a clearance much larger than the quench clearance and it contains a volume separated from the working chamber by that tight quench clearance compare to that on the left (B).
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