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Force Fed Mopar
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PostPosted: Sat Dec 06, 2008 11:56 am 
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FYI, you can mill a head enough to get about 11:1 with stock 225 pistons/rods. I have done two at 10 - 11:1. If you mill head and block, the sky's the limit.

Lou
On stock pistons? Isn't the stock compression ratio like under 9.0:1? I guess I was a little vague, I meant you couldn't mill it enough to raise compression that high on stock pistons. But, if you have done it...

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Rob M
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Dart270
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PostPosted: Sat Dec 06, 2008 3:00 pm 
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Yep, stock pistons/rods. Stock actual comp is around 7.5:1...

Lou

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Force Fed Mopar
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PostPosted: Sat Dec 06, 2008 4:36 pm 
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Yep, stock pistons/rods. Stock actual comp is around 7.5:1...

Lou
Well dang, how much can you mill off them? I would assume if you're getting that kind of compression it'd have to be at least .100".

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Ron Parker
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I will stare right into a light but not a red light. I have run in the fast lane all my adult life . The red lights were on the fire engines I drove for 20 years. I expect to see some red ale sometime in my future. Sandy you are not a killer bee . So what side are you on me or the killer bees. Your Friend Ron :D








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Dart270
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PostPosted: Sun Dec 07, 2008 6:37 am 
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More than 0.100". I have done max of 0.110" on the manifold side and 0.210" on the plug side of the head only.

Lou

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Matt Cramer
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PostPosted: Sun Dec 07, 2008 4:04 pm 
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And that affects a slant six car how?
Weren't you trying to put a slant six into an L-body? :)

Guess we'll see how much of the MPG is the engine and how much is weight / aerodynamics...

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Joshie225
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PostPosted: Sun Dec 07, 2008 4:42 pm 
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That's a bracket racing project and not something expected to achieve decent economy. 300hp and 30 MPG in a slant six a-body is unrealistic.

My point was that comparing a much more modern and efficient body and a more modern and efficient engine to a rear drive Chrysler vehicle with a slant is not apples-to-apples. For cruise fuel economy aerodynamics and engine operating efficiency are key. Weight becomes much important to economy in city cycle driving and in climbing grades.

If you really want to learn about what affects fuel economy this paper has a wealth of information. http://www.fas.org/ota/reports/9125.pdf

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Matt Cramer
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PostPosted: Sun Dec 07, 2008 6:14 pm 
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I don't expect to see the same sort of economy in an A-body that the 2.2 Turbo crowd can get, so no arguement there - though it would be intersting to see what sort of mileage an injected slant six and one of the newer Mopar four bangers would get for an engine of the same horsepower in the same car (or nearly similar ones).

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