How to tell a 3l Porsche 911 engine from a 2.7?

How to tell a 3l Porsche 911 engine from a 2.7?

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Anthony26

Original Poster:

538 posts

174 months

Thursday 12th May 2011
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Can anyone tell me how to tell a 1978 porsche 911 3L from a 2.7L engine, as they seem imposible to me anyway to tell apart and im unable to find anything obvious?

vixen1700

23,945 posts

276 months

Thursday 12th May 2011
quotequote all
Misread the title! Doh!

Edited by vixen1700 on Thursday 12th May 16:33

gowmonster

2,471 posts

173 months

Thursday 12th May 2011
quotequote all
the OP may not have the rest of the car, he could be looking at an engine on a bench for all you know!

vixen1700

23,945 posts

276 months

Thursday 12th May 2011
quotequote all
gowmonster said:
the OP may not have the rest of the car, he could be looking at an engine on a bench for all you know!
Didn't think of that! redfacebiggrin

Anthony26

Original Poster:

538 posts

174 months

Thursday 12th May 2011
quotequote all
It is just an engine and gearbox on a bench my father past away recently and I have had the huge job of sorting his garage and workshop out. Now I have somone that wants the engine and gearbox but needs to know if its a 3L or 2.7?

Moikey Fortune

1,650 posts

242 months

Thursday 12th May 2011
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does this help if you have the engine number

http://www.ppkat.com/html/engines.php


D900SP

458 posts

189 months

Friday 13th May 2011
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911 SC 3.0 is from 1978 - 1983

2.7L has magnesium crank-case and a small ignition distributor with points.
Has 6 bolts on the flywheel to crankshaft.

3.0 has alluminum crank-case and a large ignition distributor with electronic (no points) distributor that has a green sheathed wire leading off the side of it.
Has 9 bolts on the flywheel to crankshaft.

There is also a 3.0 Carrera engine from the mid 70s which uses the 6 bolt flywheel.

Pull the distributor cap off and you will be able to tell, or at least, make a start in identification.

Anthony26

Original Poster:

538 posts

174 months

Friday 13th May 2011
quotequote all
911 SC 3.0 is from 1978 - 1983

2.7L has magnesium crank-case and a small ignition distributor with points.
Has 6 bolts on the flywheel to crankshaft.

3.0 has alluminum crank-case and a large ignition distributor with electronic (no points) distributor that has a green sheathed wire leading off the side of it.
Has 9 bolts on the flywheel to crankshaft.

There is also a 3.0 Carrera engine from the mid 70s which uses the 6 bolt flywheel.

Pull the distributor cap off and you will be able to tell, or at least, make a start in identification.

Thankyou for your help I will check this when im over there tomorow, I did check that website but it failed to recognise the engine number!

GC8

19,910 posts

196 months

Sunday 15th May 2011
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Also, I think that the three litre engine will have a '930...' prefixed part number; whereas the 2.7l will have a 911 (or possibly 927) prefiixed number.

Anthony26

Original Poster:

538 posts

174 months

Monday 16th May 2011
quotequote all
I think that the three litre engine will have a '930...' prefixed part number; whereas the 2.7l will have a 911 (or possibly 927) prefiixed number.

It was a 2.7 as it did only had the 6 torques fixing the flywheel to the crank and yes you are right the prefix for the part number does start with 911. And I have been told that the gearbox is probably a 915

Gunk

3,302 posts

165 months

Monday 16th May 2011
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Has everyone copied and pasted from the same website?

Without using Google I can confirm that the gearbox will be a 915 5 speed box this was used right up to the mid 1980's in to the 3.2 Carrera's.

The mid 1970's 3.0 engine was a normally aspirated version of the Turbo's engine. The Carrera 3.0 was aA great car, I owned one for many years.