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Join Date: Jul 2003
Posts: 846
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High CR = Better fuel economy
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03-29-2005, 03:36 AM
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Registered
Join Date: Oct 2001
Location: Momence, IL 60954
Posts: 1,911
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Oh God, more CR please! My next pet peeve is deck height. I've had guys ask me if they can run a .250" deck. Combustion no longer occurs in the "combustion chamber", but fully within the cylinder. No wonder they run hot, get poor fuel economy, and make no power :-)
Charles Navarro LN Engineering http://www.LNengineering.com Aircooled Precision Performance
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Charles Navarro President, LN Engineering and Bilt Racing Service http://www.LNengineering.com Home of Nickies, IMS Retrofit, and IMS Solution |
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03-29-2005, 03:59 AM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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Why would someone want to run a quarter of an inch in deck height? Or is that a typo? That'd be like 4/1 CR.
BTW, I really hope you're not bagging on Grady Clay. He's the real deal.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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03-29-2005, 11:07 PM
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Join Date: Oct 2001
Location: Momence, IL 60954
Posts: 1,911
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No, i'm serious about the .250". Some vw guy building a turbo engine and didn't know how to get the compression ratio down and thought that a quarter inch of deck height was acceptable.
As quoted by Grady in that other thread, "Today I would raise the CR even more, have twin plugs, smaller valves, and Nikasil cylinders. I would also apply most of the race engine "tricks" because they typically reduce losses." He's totally on it. I wish more people were of this mentality. Charles Navarro LN Engineering http://www.LNengineering.com Aircooled Precision Performance
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Charles Navarro President, LN Engineering and Bilt Racing Service http://www.LNengineering.com Home of Nickies, IMS Retrofit, and IMS Solution |
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03-30-2005, 04:32 AM
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Join Date: Feb 2005
Location: Warragul Victoria Australia
Posts: 100
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Charles I would have to agree about using race engine tricks in a road engine. You end up with a much sweeter road engine, they are smoother, more responsive, better performing, and usally more economical!
Regards Mike
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Regards Mike www.spyderautomobiles.com.au http://spyderauto.wordpress.com http://www.facebook.com/#!/pages/Spyder-Automobiles/311683175539345 Spyder Automobiles, maintaining the integrity, building excitement! |
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03-30-2005, 04:48 AM
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Which is why most of today's road engines owe an awful lot to Keith Duckworth, Mike Costin and their DFV.
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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03-30-2005, 07:55 AM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Increasing the compression ratio is one of the few things that will increase both power and fuel mileage due to increased thermal efficiency. Unfortunately, our engines have a lower upper limit due to combustion chamber design and the lack of a second spark plug (my engine anyways).
Sherwood |
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03-30-2005, 10:51 AM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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Quote:
O.K., cool. I misunderstood your post.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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03-30-2005, 11:59 AM
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1969 Porsche 911E 2.0 E
