----------
> From: David Grove Grove Automotive <groveautomotive@xxxxxx>
> To: PSU>EDU> <L-FORWARDLOOK@LISTSPSU>EDU>>
> Subject: Re: [FWDLK] Engine performance vs fuel etc
> Date: Saturday, November 07, 1998 10:37 AM
>
> More info: Someone stated that the TRUE compression ratio of an engine (
I
> think this applies to all mfg's ) is somewhat lower that advertised -
this
> is FACT - I can tell you from building many "legal" drag race engine that
> there is work to be done to achieve the "advertised" CR. In fact, when
> Chrysler lowered the CR on 71 383's, the engine was actually identical to
> the 70, only the "specs" were changed. Another note - on the 68-69 383
HP
> engine, the "advertised" CR cannot be achieved without piston to valve
> interference (with a "legal" camshaft), and since notched pistons were
> against the rules in "stock eliminator" (unless originally equipped from
> the mfg). you were "eliminated" from the git-go if you wanted to do a
"383
> HP stocker"!
> One more thing - Chrysler did not have induction-hardened exhaust seats
in
> production until the 73 model year. DaveG.
> ----------
> > From: Lars Larson 56 Plymouth <LARSPAINTR@xxxxxxx>
> > To: L-FORWARDLOOK@xxxxxxxxxxxxx
> > Subject: [FWDLK] Engine performance vs fuel etc
> > Date: Saturday, November 07, 1998 9:26 AM
> >
> > Can only state that I have had no problems with my 56 Plymouth Sport
> Suburban
> > 277ci V8 with factory power pac and overdrive.
> > Full rebuild 6 yrs ago including new pistons and 60 over bore, now
having
> an
> > effective ratio of (only) 9:1. Have put perhaps 10k miles on it, many
> > highway, and it cruises 75 no problem. It has been from Ok City to
> Barrie
> > Canada. Have not experienced any trubbles with gasoline or preignition
> or
> > whatever. And expect it to run another 20 years unless fuels get super
> > exotic- I see either Ford or Chev has a variable fuel engine as
standard
> now,
> > that runs on the 85% ethenol fuel. (anyone know where its available
and
> whats
> > the cost?).
> > I dont know of a finned mopar that has over 10.5:1 and thats a special
> case.
> > Normal fuels (not oxygenated) should cause us no problems also since
> Chryco
> > has had hardened exhaust valve inserts since year one. Thanks
Chrysler!
> > L.
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