DeTomaso Mailing List: February 98, Message #220
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Ted, Thanks for the info. The pistons I have in mind are the stock pistons that are in my '74 Pantera which, I'm told, have a shallow dish. I'm contemplating bolting on a set of Aussie heads onto the stock short block to serve as an interim engine until I get around to building a stroker. Thanks, Dan Jones >>> "Ted A. Mitchell" <tmitch@gte.net> 02/03 11:16 am >>> It depends on the type of dished pistons. If they have a flat top section that will match up to the quench areas of the heads, they MAY do some good. The common dished pistons don't have enough. I had some special J&E pistons made for Vader's supercharged engine, which matched the combustion chamber of the closed heads. This allowed me to get down to 9:1 CR (with a little unshrouding of the valves), and still run 6 to 10 psi boost pressure on pump gasoline with NO detonation. J&E has the pattern for these pistons. This shows the advantage of the quench heads. Most of the supercharged engines had to go down to 7:1 with open chamber heads to prevent detonation. Ted (Vader) Mitchell http://home1.gte.net/tmitch/pe.htm http://home1.gte.net/tmitch/chpie.htm http://home1.gte.net/tmitch/index.htm -----Original Message----- From: Dan Jones <djones2@mdc.com> To: Multiple recipients of list <detomaso@realbig.com> Date: Tuesday, February 03, 1998 1:12 PM Subject: Re: '71 Pistons - Reply > >> You can vary combustion ratio with with deck height, but closed combustion >> chamber heads to piston clearance should never be more than .040, or >you >> might as well be using open chambers. I recommend 0 deck height with >a >> compressed gasket of 0.29 approximately - NOT FOR over 7000 rpm. > >I assume the above applies to flat top pistons. What happens when you >use >dished pistons? Does the quench effect still apply? > >Thanks, >Dan Jones >