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Re: Jet hot and rev limiting rotor arms.
From: email@example.com (Graham Thackrah)
> the replacement rotor arm for my 80 sport is going to cost me =A31=6.
>It is a roundish looking one and apparrently acts as a rev limiter. I have
>rotor arm from Halfords (=A32.75 odd and rectangular in plan view) which=
> will fit as well but doesn't limit revs. has anyone else come across this
>replaced with either the rev limiting arm or alternative? I have already
>decided to replace with the limiting one but would be interested to know
>it works. You can rotate the present arm backwards opposing its usual
>direction of rotation, this I assume is to alter the timing at high revs
>(actuated by a vacuum tube) but is it anything to do with limiting the
Hello Graham. Could you use GBP (or UKP) instead of whatever symbol is
The rev limiters in my Audis are in the rotor arm (some Audis cut off the
fuel pump using a clever relay or ECU). The rotor arm has a weight on a
spring. When the revs exceed a certain value (6800?), the centrifugal force
on the weight overcomes the spring and the weight moves and shorts out the
EHT, killing the spark. Result - instant limiting of speed.
>I had planned to tackle some rust spots this weekend but as the UK listers
>are aware the climatic conditions prevailing are far from suitable, any
>comments from California ungratefully received.
I've also got some rust spots that need treatment - they seem to be surface
only, except for a deep one underneath the rubber surround to the
1984 Audi 80 quattro
1989 Audi 100 Avant