I would suspect they 'tolerate' the ignition advance because the design is so
poor thermally.. It is not the sign of a good design, it is the characteristic
of a poor one though. As the combustion chamber gets better the timing
requirement goes down not up.. i would suspect the only reason chrysler is
coming back out with a small hemi is due to market appeal and has nothing to do
with being either efficient or a good design in general. It is more of a 'if we
build them the old hot rodders will buy them' I would be even more willing to
bet most of the engineers at chrysler that do power train design are rolling
their eyes and say why this.. any mediocre 4 valve design flows better and is
much better thermally.
For once give me a current racing class that a hemi is superior that does not by
nature of the class require a slow burning fuel...(nitro) a a 4 valve pent roof
cylinder head is legal and available.
Oh and a 2 liter honda in their sport car makes way more power than the 3 liter
Ferrari you mention and is emissions legal in all states and drives very nicely
too.
Dave Dahlgren
"Albaugh, Neil" wrote:
>
> Dick;
>
> Add one more hemi engine to the list: the SOHC 3- liter 128F Ferrari engine.
> It has hemi heads and they must flow pretty well although I have no data
> other than the fact that it put out 240BHP from 183CID and was as completely
> streetable as a Volkswagen. Another indication of the hemi heads' efficiency
> was that it could tolerate lots of ignition timing advance.
>
> Happy New Year to all. Regards, Neil Tucson, AZ
>
> -----Original Message-----
> From: Dick J [mailto:lsr_man@yahoo.com]
> Sent: Tuesday, December 25, 2001 4:26 PM
> To: DrMayf; landspeedracer; land-speed@autox.team.net
> Subject: Re: Hemi vs Ford & Chev Controversy
>
> --- DrMayf <drmayf@teknett.com> wrote:
> Is
> > your horse power comparison made using the
> > Desoto Hemi? Or one of the 500
> > plus big inch monsters?
>
> I was comparing flow numbers for heads. And I
> compared a 270 Desoto to a 289 Ford; a 300
> Chrylser with Hemi heads to a 305 Ford; a 354
> Chrysler to a 350 Chev. No Apples to Oranges
> here. Of Course, I'm talking flow numbers, not
> HP numbers, but I think HP is directly tied to
> max flow.
>
> Dick J
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