Re: [Amc-list] LPG 258

[Matt Haas <mhaas@xxxxxxx>]

Since when did VE have anything to do with compression ratio? If the 4.0 
head has a smaller combustion chamber, than compression goes up but how 
well the head flows doesn't magically change the physical properties of 
the motor.

Matt

On 10/5/2008 1:59 AM, Jim Blair spouted this sage advice:
> Actually, since the VE (volumetric efficiency) goes up with the 4.0L head (even more with the HO head) the compression will go up slightly.
> 
> Jim Blair, Lynnwood, WA '87 Comanche, '83 Jeep J10, '84 Jeep J10
> 
> From: Frank Swygert 
> Subject: Re: [Amc-list] LPG 258
> To: amc-list@xxxxxxxxxxxx
> Message-ID: 
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Look for different pistons -- you can only go up maybe one full point by shaving the head alone. Compression doesn't go up with the 4.0L head on a 258 -- only 8.7:1 (stock 4.0L). The combustion chamber sizes are the same on the 258 and 4.0L.
> 
> ------------
> Date: Thu, 02 Oct 2008 16:43:26 -0400
> From: Brien Tourville 
> 
> LPG runs best with high compression - so -
> a 4.0 7120 head to a stock '81 258
> would require roughly how much shaving
> to accomplish 11 to 1 compression ?
> 
> --
> Frank Swygert
> 
> 
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-- 
mhaas@xxxxxxx
Cincinnati, OH
http://www.mattsoldcars.com
1967 Rambler American wagon
1968 Rambler American sedan
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