Plugs n Points Confusion

[niall]

Was it normal for a type 930/20 3.2L engine to have a distributor with points? (I thought that this model had an electronic system).

Also I fitted 3.0L plugs to this engine as I was informed by seller that it was a 3.0 engine, will these work ok in the 3.2L engine with points?

[Gunter]

930/20 shows up in the Red Book as a RoW 3.2 liter 1984.
Motronic ignition system, No points.
Are you sure about the engine type?
Use a light and follow down the right fan post to the engine case to find the engine type number stamped.
Is it 930/20?

[niall]

Hi Gunter

Yes I know its strange, I bought the car in the belief it was a 1975 3.0L last year.

This week I have only discovered, with help of kind people on this forum that its got a 3.2L motor based on the numbers below.

The serial number is 6660175 and type is 930/20, I've just checked again to be sure.

[Gogar]

Pictures?

Did you open up the dizzy and actually find points in it?

[niall]

Yes I changed the points last weekend, they are the same points as in the 3.0L distributor.

[johndglynn]

Has it got CIS? Have you dyno'd it? Maybe it's a three litre built into a 3.2 case on an SC crank or something. What are the plugs in it now and what plugs did you take out of it? If it is all running OK, no rattles from the motor, not getting too hot and it goes alright then I would say no worries, as long as you didn't pay the earth for it.

Put some pics up lets have a look. Did it come from the UK?

Where in Eire are you - sorry for the load of q's

[johndglynn]

Originally posted by niall
The serial number is 6660175 and type is 930/20, I've just checked again to be sure.

That serial number is a Carrera 3.o engine number, not a 3.2 number. Only '76 C3 930/02 engines start with 666.

Carrera 3.2 930/20 engine numbers start 63E and go through to 63K depending on the model year.

I would say you have a 3.0 motor there and something else has you going off course. Where are you getting 930/20 from? Pics really are the thing here.

[rattlsnak]

What 3.0s had points?

[niall]

OK

I'll be back with pic's.

emm where's the camera?

[Gunter]

That's a mystery.
Yes, pictures will tell us if it's Motronic or CIS or Carbs, or?
Red Book page 83 says 3.2 RoW.
Did someone change the gear on the crank to fit a distributor with points?

[tonythetarga]

See the attached thread: Distributor Repair for 77 Carrera 3.0

read the post by Early_s_man and see the link. He states that a Carrera 3.0 has the same points distributer as the 2.4 and 2.7 motor.

[rattlsnak]

ok, i forgot about the early 3.0 Carreras. (75-77) The SC 3.0s were pointless!

[Gunter]

But, would Porsche give the same type number 930/20 to different engines years apart?
I don't believe that.

[johndglynn]

Originally posted by Gunter
But, would Porsche give the same type number 930/20 to different engines years apart?

I still reckon there is a mistake with that 930/20 - it should turn out to be a 930/02 engine. The 666 engine number is right for a C3, not a 3.2.

930/02 is a gem of a motor. Those who say that there is no difference from C3 to SC have no idea what they are on about, the engines are totally different in character. The SC is in no way pointless however

[niall]

Brief History
I bought this car as a modified carrera 3.0 1975, its has had alot of work done to it by previous owner (964 look alike), and now some confusion exists as to the actual year and size of engine the car has??? ???? ???
By the way all this started when I recently had an alternator issue and could not find the V regulator, then discovered it had a later type Bosch alternator with built in regulator which was not the standard for a 1975 3.0 carrera


Find attached pic 1 of type number behind fan post, I could not get a clear shot of serial number due to flash, number is certainly 6660175.

Pic 2 shows distributor with points (notice engine mount damper also unusual in a 1975 carrera 3.0 I think.
Pic 3 shows oil drain plug to left of case with no screen, also unusual for a 3.0 1975.

Pic 4 right side of engine.

Pic 5 engine.

Some more pictures:

[johndglynn]

Got a right mix of stuff on there: steel injector lines, Carrera case, dizzy and points. Looks to me like the original engine went bang (mine did) and they built something up for this car. C3 cases in good condition are very sought after, rare too, so maybe not a surprise that they have picked a cheaper/easier route.

Is the engine number stamped into the metal with a star at each end? Will try to get a pic of mine. Maybe they just re-stamped the old number into the finished engine so it would get past the 30-year law in Eire with no questions asked.

I would want to get it on a dyno, check the power and check the afrs were all OK. Any way of getting hold of the guy who originally built it - anything about it in the history? You could also contact Porsche GB and get them to give you a build sheet based on the chassis number, they will tell you what the original engine number was.

What is the chassis number by the way, let's check that as the C3 is 76/77 not 75 (though they made a few in 75 for 76MY). PM me if you don't want to broadcast it.

[Bill Verburg]

930/20 is an '84 - 89 euro case(w/o large sump drain) and 666**** is a '76 C3 engine #

'76 - '77 C3 were the only 3 liter engines w/ points and cis

3 liter SC had distributors that ran backward(because of the crank gear) from all other 911 engines.

It looks like someone put C3 injection and ignition on a RoW 3.2case(maybe a whole RoW 3.2 bottom end). p/c use the same 95mm bore on the 3 and 3.2, the 3.2 has a long stroke crank.

If you can find someone w/ a whistler you can check c/r and displacement w/o disassembly

[niall]

No chance of getting engine builder/installer as I bought the car in Italy.

Yes the engine serial number starts and ends with a star/asterix. Bought it that way from Italy, they dont check engine numbers over here for the 30 year rule only chassis.
I cant get chassis number today as I'm away from home with work.

Is there any other way to identify a 3.2 externally/visually?

[Bill Verburg]

Originally posted by niall

Is there any other way to identify a 3.2 externally/visually?

You have done that, the case is a 3.2 for sure. The question is; does it have the high compression p/c and long stroke crank?

[johndglynn]

Originally posted by niall
No chance of getting engine builder/installer as I bought the car in Italy.

I have seen a similar car advertised on some of the Eire car sites previously, assumed you had bought it there via UK. Like Bill says, deffo 3.2 Carrera case, the intake/injection etc is early and not 3.2, steel injector lines are classic 204bhp SC.

You could get the number off the fuel distributor, that will tell you what metering head you have on there and whether C3 was reused. A dyno will tell you what the car is putting out, could be good news.