RE: compression ratio

[Paul Lennemann <pjlenn@xxxxxxxxx>]

I've come to the realization that I'm going to have to pull the engine 
to do this right.  (Did you hear that Rich?)  So while it's out I could 
have the block decked as you suggested.  I could also use a different 
piston like a 6-pack piston that has a lower pin height, raising it up 
in the hole.  Either one dictates that the engine come out. I'll 
probably wait till March when the weather breaks a little around here 
before I pull it.  (Mark your calendar Rich)
I've also got a new 770 CFM Holley Carb and set of Schumacher Tri-Y 
Headers to put on it.  I'm also looking for a Performer RPM intake.  It 
will definitely be faster when I get done.

Paul L.
'63 Sport Fury
440/727
http://www.1962to1965mopar.ornocar.org/ml-lennemann63.html

William Cole wrote:
> 
> 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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> > 
> > '62 to '65 Mopar Clubhouse Discussion Guidelines:
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> > 
> -- 
>   William Cole
>   wedge64@xxxxxxxxxxx
> 
> -- 
> http://www.fastmail.fm - I mean, what is it about a decent email 
> service?
> 


----
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.