substitute for rev limit rotor, Bosch # 1234 332

[caproader]

guys,
Is there a solid rotor substitute for the 7300 rpm rev limit rotor, Bosch # 1234 332. If so, could i ask what the Bosch or Porsche Part number might be?

The rev limit retainer spring in my 901.602.929.00 rotor let loose the other day, stranding me by the roadside. Rotor function would have worked fine if the rev limiter function had not broken. Seems to me if I can restrain myself, I do not need the rev limiter and a solid rotor would work fine.

Any and all help/thoughts appreciated.

The Capitalist Roader, member # 322

73 S with sporto
69 912 without sporto

[Jon B]

Rotor function would have worked fine if the rev limiter function had not broken.
Seems to me if I can restrain myself, I do not need the rev limiter and a solid rotor would work fine.

Why not just block, disable or remove the rev limit function?

Jon B.
Vista, CA

[Chuck Miller]

I keep an extra in the car.......

[caproader]

Guys,
Thanks for the responses. My frugal self says that I am reluctant to spend extra for something that I will either disable or spend extra so that I have a spare when the rev limiter strands me along side the road. Especially if a solid rotor would never strand me.

So my research (and an inventory of used parts in my garage) lead me to a solid rotor, Bosch part number 1 234 233 215 that my Bosch cross reference book says will work on either a Benz 280 SL (6 cylinder) or a VW Karman Ghia (4 cylinder).

Is it possible that the same solid rotor will work on both a 4 cylinder and/or a 6 cylinder motor?

Thanks for the thoughts and help

John

[911MRP]

guys,
...... Seems to me if I can restrain myself, I do not need the rev limiter and a solid rotor would work fine.

Any and all help/thoughts appreciated.

The Capitalist Roader, member # 322

73 S with sporto
69 912 without sporto

How would your frugal self feel if you didn’t restrain yourself after somehow eliminating factory / Bosch rev limiting mechanism ? Are there scenarios without rev limiter that might have “costs” to weigh into the economic balance of choosing to eliminate vs carry a fairly inexpensive spare. A spare that you might well use at some point in routine
maintenance if car is a keeper, so hardly a big spares inventory investment.

[Arne]

Yes, the rotor doesn't care whether it transmits 4 or 6 or however many sparks per revolution. If the dimensions are all correct, it will work.

But I'd only use such as a spare or for troubleshooting, not for normal use. These engines are far too eager to rev well past the safe zone for me to be comfortable with no limiter at all.

I have recently disabled the limiter on my rotor to verify that it was not working correctly. In my case, it appeared that the limiter was cutting off the spark far too early (as low as 4k when revved quickly) and would occasionally stick in the limited spot until the engine died. Once dead, I could restart normally and all was fine until I got exuberant once again. Weak spring, I guess.

Disabling it has shown that it is probably bad. I've had no glitches since. But I will replace it with the correct limiting rotor, as the consequences of a serious over-rev are quite distressing. I may keep the disabled one in the tool roll for "just in case".

[Jeff Higgins]

I don't have a part number handy, but back when I still ran a distributor (I now use an Electromotive crank fired setup), I just used a rotor from an old air cooled Beetle. There is a "tall" version and a "short" version - you need the "tall". Works like a champ. I was, however, also running an MSD 6AL ignition box - the "AL" stands for "adjustable limit", wherein the rev limit was set with a replaceable "chip" stuck into one side of the box.

[66S]

I only use solid rotors. Then again I like solid chain tensioners. Most damaged 911 motors Ive seen were from selecting the wrong gear, a rev limiter is useless then.

[G69]

Many years ago I put a solid rotor in my BMW Bavaria. It came in handy when speed was the only concern...
That straight six with 10-1 pistons would rev to Heaven- safely.

I have one but I wouldn't put one in a gold-plate 911 motor.

It IS frustrating the many different permutations of the centrifugal rotors.

Different rpm specifications and different Bosch distributers make for a lot of different rotors.
Many of today's parts suppliers don't really care about what they sell.
Added to that the corner-cutting by Bosch and it can be a mess.

I've bought several rotors trying to get one to fit correctly in a friends 1972 911T
'Same part numbers printed on box and the rotors fitted taller and shorter in the distributer than the original!
A taller one became a real mess. The shortie lasted only a few months-

Once you get the correct one buy another.

For part time cars a rotor will last a really long time.
There is no reason not to lightly file the tip of an old one to clean it up. Lightly being the watchword. Don't try to get it smooth again. Just remove a little brass to expose new conductor. It'll go another 12,000 miles.

If the car isn't a show winner check out the 123 distributer. It is affordable, has custom spark advance and has different settable rev limiting.

It looks similar to stock Bosch and eliminates a lot of 50 year-old tech that is NLA.