[Diy_efi] Combustion chamber question

[Phil]

The ability of these motorcycle engines to produce such excellent power on
relatively poor fuel, while having high compression...without a det.
condition, is obtained by more of a function of engine mechanical dynamics
of how they are constructed. All aluminum alloy, constant flow cooling
systems, (some) near perfectly straight intake tract path and a very short
stroke length which decreases piston TDC dwell time. (reduction in torque)

All of the above reasons, (especially the latter two) will promote high HP
numbers, but the engine falls short on torque output. (i.e. typical, high
strung motorcycle engine) In addition, have you ever taken the airbox off of
the carbs and peered down the venturies, on say...an inline four? Most of
the time you can see the face of the valves with ease....through the
butterflies....... (big HP promoter)

This is quit an oversimplification, but I think you can get the
gist.........

-Phil
---------------------------------------------------------------

----- Original Message -----
From: Perry Harrington <pedward at apsoft.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, May 11, 2002 9:07 PM
Subject: [Diy_efi] Combustion chamber question


> Here's a question for the gurus of the list.  I was under the impression
that
> hemi heads are the best WRT detonation and power.  However a response
countered
> that.
>
> So, here's the question:  How does Honda make 183HP per liter with 12:1 CR
> on the CBR600 engine?  I understand that RPM is more of an affect on the
HP/l,
> but running 12:1 on pump gas without detonation is impressive.
>
> Perhaps someone could shed some light on this?
>
> --Perry
>
> --
> Perry Harrington             Linux rules all OSes.               APSoft
()
> perry at apsoft dot com                  Think Blue. /\
>
> Those who would give up essential liberty to purchase a little temporary
safety
> deserve neither liberty or safety. Nor, are they likely to end up with
either.
>                              -- Benjamin Franklin
>
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