[Diy_efi] Combustion chamber question

[William Shurvinton]

No Cat, no EGR straight through pipes. All helps. As many valves as they can
cram in (assume 600 is  4-valve per) and as big as possible.

I would hazard to guess that the 150cc swept volume/cylinder has no small
part to pay as there isn't far for the flame to propagate so a lot of the
effects that can cause problems with larger engines aren't a worry, leaving
the designers to concentrate on the ones that are. Or to put it another way,
the whole engine has less displacement than one cylinder of a small V8.

And above all, if the clientele for the design don't care about how it runs
below 5000RPM this makes things a lot easier. After all 60lb-ft of torque
isn't much use in a 3000lb car. Now in a 1000lb car things start to get
interesting and the setup works quite well (all depending on your definition
of streetable of course)

If you do want torque a firm in the UK specialises in putting 2 bike engines
in silly cars like mine. The people who drive these are not considered
particularly sane by the rest of society :-)
----- Original Message -----
From: Bruce <nacelp at bright.net>
To: <Diy_efi at diy-efi.org>
Sent: Sunday, May 12, 1996 1:08 PM
Subject: Re: [Diy_efi] Combustion chamber question


>
> Yes, the tune has to be right, but that's a function of the mechanical
> elements.
> Yes, cool air helps to keep the motor out of detonation.   And running a
> little on the rich side will help with in cylinder cooling.
>
> As far as the motorcycles go, do they have any emission standards?.  If
not
> or depending on how loose they are can be a huge asset.
>
> I'd also suspect they are an IR or close to it in design, and to date, I
> haven't heard of anything that approaches them for HP or TQ.
> Bruce
>



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