Re: [FWDLK] 290HP FURY ENGINE AND "DOMED PISTONS'
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Re: [FWDLK] 290HP FURY ENGINE AND "DOMED PISTONS'



Neil,

Did you get your distributor?

I did find mine after searching through a few boxes;
1956 Plymouth 277 V-8
Single points
Autolite #1688647
1B 4301A 2L599082

It comes with a NOS breaker plate assembly as well if you or anyone on the list is in need.

Gary Pavlovich
----- Original Message ----- From: "Eastern Sierra Adjustment Svc" <esierraadj@xxxxxxxxxxx>
To: <L-FORWARDLOOK@xxxxxxxxxxxxx>
Sent: Thursday, November 18, 2010 3:22 PM
Subject: Re: [FWDLK] 290HP FURY ENGINE AND "DOMED PISTONS'


Not to say that I told-you-so, because I didn't, here, but
over on the FWDLK website a similar question arose about
the D500 pistons -vs-Poly pistons, and how/why their compression
ratios were different.

I don't have the Good (Parts-)Book in front of me, now, but
the D500 pistons are physically taller than the Poly pistons
(which even, IIRC, are of negative-deck-height), which produced
their lower compression ratio---despite the larger volume of
the domed Hemi heads--which would tend to decrease an
over-all  c.r. .

The Hemi pistons even feature valve-reliefs in them; the Polys are
not 'notched'.

There are different P/N's for the Dodge Pistons, and, I'll bet different
P/N's for the PLY's, too.

BTW, it has been a common practice (deception) to install Hemi heads
onto a Poly engine block.

The Poly's compression ratio was 8.5:1; the D500's: 9.25:1 (even with its
'domed' combustion chamber, and, with its 'tall' pistons).....

Installing the 'domed' Hemi heads onto the negative-deck-piston-topped
Poly engine probably REDUCES the c.r. to something like 8.0:1 !!!

Neil Vedder




DOLORES ECKERSON wrote:
Hello Members

After much time and searching I finally can CONCLUDE the 'domed piston' questions involving the 'higher compression' pistons supposedly in the 290Hp engines.

I HAVE A TRUE ORIG FP31 MOPAR PISTON,,,along side a regular 318 9/1 compression piston of about 1960 vintage. ALL POLY 318s were 9/1 compression except for of course the 290HP engine (supposedly)

I am able to use a common wrist pin to locate both pistons at the same point that they would be on the same connecting rod.

GUESS WHAT--The FURY piston is higher by .010 to .015 (depending on how and where you measure it.)
SURE DOESNT SOUND LIKE MUCH DOES IT??


ANYWAY---A little math based on 9/1 compression for the stock piston and using a .012 average higher FURY piston YIELDS-------------------
9.23/1 for the FURY PISTON!!!

So the FURY piston WAS A SPECIAL PISTON,,,yielding approx 9.25/1

ED ECKERSON
LI  NY

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