Re: compression ratio

[William Cole <wedge64@xxxxxxxxxxx>]

Why not go deeper and have the block decked? If you want compression
using your pistons, I think it's worth the extra work and expense. My
motor is at zero deck height with flattop pistons and Eddy heads and I
have around 11:1 compression.

Bill C.
On Sun, 13 Jan 2008 20:43:07 +0000, "Paul Lennemann" <pjlenn@xxxxxxxxx>
said:
> 
> I got one head pulled off of my motor today.  I was pretty disappointed 
> in what I found.  My goal is to get the C.R. bumped up to @ 9.0:1 or a 
> little better.  What I found was that my pistons are down in the hole at 
> least .140".  Using the C.R calculator at:  
> http://www.csgnetwork.com/compcalc.html
> 
>  I used 4.32" bore dia.
>         3.75" stroke
>         0.25 compressed head gasket thickness (a guess)
>         4.40" Head gasket bore dia. (a guess)
>         88 cc's for the chamber volume (906 heads)
>          0 piston dome volume (flat top pistons)
>          0.140 for piston deck clearance
> This yields a C.R. of 8.04:1.  This was @ my guess for what I had.  But 
> finding those pistons that far down in the hole was a bit of a bummer.  
> I was hoping to be able to mill the heads a little to achieve the higher 
> compression I was looking for but with the pistons down 0.140 I don't 
> think that will get me where I want to be.
> I'm guessing if I took 0.060" off the heads it would drop the chamber 
> volume to @ 84 CC's.  That would only give me a bump of @ .23.  Not much 
> bang for the buck.  So it looks like I'm going to have to go into this 
> thing a lot deeper than I wanted to in order to meet my goals.
> 
> Paul L.
> '63 Sport Fury
> 440/727
> http://www.1962to1965mopar.ornocar.org/ml-lennemann63.html
> 
> 
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-- 
  William Cole
  wedge64@xxxxxxxxxxx

-- 
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----
Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html.