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914World.com _ 914World Garage _ Combustion camber design?? Whos' to copy??

Posted by: Mueller Sep 2 2003, 05:51 PM

If one wanted to make new heads (pick one of the following, mabey a combination of two or more )

billet
new cast
2 valve
3 valve
4 valve
watercooled
aircooled
oil-cooled
hemi-head
twin-plug
single plug

What "modern" engine would make a good "pattern" to copy for combustion chamber design??

Ideally, keeping the same basic intake and exhaust configurations would be nice....larger diameters or the location could be changed a little, but I'd want to keep them as close to stock locations as possible

Does any manufacture make a decent modern motor with flat top or slightly dished pistons similar to those on Type IV motors?

Posted by: Charles Deutsch Sep 2 2003, 05:54 PM

How about the last year of Porsche's air-cooled flat-six motor?

Posted by: airsix Sep 2 2003, 05:59 PM

I'd look at bikes, Honda S2000, and other mega-hp-per-displacement motors.
-Ben M.

ps - see if you can come up with something with overhead cams please. Thnx

Posted by: J P Stein Sep 2 2003, 10:02 PM

Hummm....The "latest & greatest" thinking that I have read is the pentroof head. Cosworth came up with it some time back. 4 valve with 38 deg included angle twixt the int & exh side. F1 engine builders are not eager to share their newest stuff, so that's bout all I know. The shallow chamber gives high compression
with a low piston dome.....better flame propagation.

You can bet your ass that they already have something better or they wouldn't let this out.
4 valbes & 2 cams per bank. How they get good port angle is beyond me. Water cooled, of course. Nobody was able to make a good 4 valbe air cooled head.....and many tried, I understand.

Posted by: Dave_Darling Sep 3 2003, 11:46 AM

Well, some of the motorcycle manufacturers have... But an MC engine is not a car engine! Different constraints, different aims.

--DD

Posted by: PatW Sep 3 2003, 01:45 PM

During the last Mopar Alley meet. A guy brought in the head off a late model V6 and a 70's 440 to show the difference in the swirl and how far the technology has come. Looked like to me that Mopar was thinking about swirl long before anyone else. (see Hemi)

my .02c.

Pat