Dick,
I got today the first information from Porsche to your problem.
Very popular by the old 914/4 and 912E models are now to reasons.
1. What you check ist the gas pressure from the gas pump - but this pressure
just in front of the engine. there is the possibility that you got dirt in your
tank which is sucked in from the tank into the gas (fuel) filter and closed
them so the pressure breaks down upper a rpm level.
2. the distributor - from where the spark plugs wiring went out into the engine
and your plugs got the electric power (I write this a little bit complex due to
this, that I don't know if I use the right american words) - inside the
distributor is your rpm limiter. This limiter works with a spring. When the
spring goes old, it loose tension and the limiter starts to be "activ" earlier,
means by a lower rpm. The test solution - simple interrupt the contact of the
limiter with your distributor with some isolating material between the limiter
and the connector - may be a piece of plastic - or fix the spring in a position
before the limiter got the contact to break the power.
To our opinion, it looks so that the failure you got is more the #2 reason,
when we read your explanation.
If the #2 ist the reason, and you like to get a proper spare part and can't get
them, I will provide you the address of the Porsche World Wide Spare part
center in Ludwigsburg, this is only some miles away from my place, and you can
order there every soare part, also vintage spare parts as this whgich you need
for your 912E.
Let me know, if you was successful when you done the investigation on this two
"reasons".
If not, write me the results, and we will check for other possibilities.
See ya
Pork Pie
"Dick J" <lsr_man@yahoo.com> schrieb:
> I'm really baffled now. That site is a complete factory service manual for
>the fuel injection system. I read it through twice and I can find nothing
>like a rev limiter built into it. Yet, my motor cuts off so precisely and
>totally at exactly 5200 RPM every time. It's just as positive a cut as it
>would be if I turned the switch off. As soon as I lift a little and let
>engine speed drop back down a couple hundred rpm, everything is back to
>normal. The ignition is old fashioned points, but there is no studder, or
>missing or hesitation. It runs like a clock to 5200 then - dead.
> Dick J
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