data.3news-bydate.test.rec.motorcycles.104298 Maven / Gradle / Ivy
From: [email protected] (Nick Pettefar)
Subject: Re: Rejetting carbs..
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Mark Kromer, on the Thu, 15 Apr 1993 00:42:46 GMT wibbled:
: In an article rtaraz@bigwpi (Ramin Taraz) wrote:
: >Does the "amount of exhaust allowed to leave the engine through the
: >exhaust pipe" make that much of a difference? the amount of air/fuel
: >mixture that a cylender sucks in (tries to suck in) depends on the
: >speed of the piston when it goes down.
: ...and the pressure in the cylinder at the end of the exhaust stroke.
: With a poor exhaust system, this pressure may be above atmospheric.
: With a pipe that scavenges well this may be substantially below
: atmospheric. This effect will vary with rpm depending on the tune of
: the pipe; some pipes combined with large valve overlap can actually
: reverse the intake flow and blow mixture out of the carb when outside
: the pipes effective rev range.
: >Now, my question is which one provides more resistence as far as the
: >engine is conserned:
: >) resistance that the exhaust provides
: >) or the resistance that results from the bike trying to push itself and
: > the rider
: Two completely different things. The state of the pipe determines how
: much power the motor can make. The load of the bike determines how
: much power the motor needs to make.
: --
: - )V(ark)< FZR400 Pilot / ZX900 Payload / RD400 Mechanic
: You're welcome.
Well I, for one, am so very glad that I have fuel injection! All those
needles and orifices and venturi and pressures... It's worse than school human
biology reproduction lessons (sex). Always made me feel a bit queasy.
--
Nick (the Simple Minded Biker) DoD 1069 Concise Oxford Tube Rider
M'Lud.
___ ___ ___ ___
{"_"} {"_"} {"_"} {"_"} Nick Pettefar, Contractor@Large.
' ` ` ' ' ` ` ' Currently incarcerated at BNR,
___ ___ ___ ___ Maidenhead, The United Kingdom.
|"_"| |"_"| |"_"| |"_"| [email protected] '86 BMW K100RS "Kay"
` ' ' ` ` ' ' ` Pres. PBWASOH(UK), BS 0002
.
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