User 41221

Can you guess check me on this? I have an '83 engine thats been torn down and the block is in excellent shape. Since I have an over abundance of parts sitting around, I started thinking maybe I should put together a fresh 951 engine instead. To convert the engine, I need:

951 head (check!)
951 pistons (I have three, and need to buy one Group 1 piston)
951 oil cooler housing (check!)
drivers side engine support (check!)
951 oil pan (need one and am now kicking myself for selling one about 8 months ago...)
tap the upper balance shaft housing for the oil line

Am I missing anything?

Regards,

Sam Lin

951 cam
951 flywheel/clutch

Sam

User 41221

I'm going with a new cam and clutch, but yeah, need those too. Thanks Sam.

Regards,

ftanguay

What about the head stud? I think on the N/A they are M10 and on turbo they are M12... And I also recall some people put M14 stud on race engines. You just have to bore and make tread for the M12??? It coundn't be so simple... it's porsche after all.

Just a concern that I have.

Tom M'Guinn

They're both M12 studs. I assume you have forged rods from the 83?

944Ecology

I think that you will have difficulty getting the proper oiling for the turbo, due to the difference in design of the balance shaft covers. The very early cars had not been designed to be tapped like the later ones.

Of course, I could be wrong, but you should take a hard look at that aspect. It could be a showstopper.

gb

Chris White

I have done that ‘conversion’ before – the best way to deal with the turbo oil issue is to use a Canton oil filter and tap the top plate for an oil line to the turbo (may need a restrictor depending on your turbo choice).
The early NA cam and the turbo cam are the same part.
The oil galleys were changed in the series 2 cars to provide more oil volume, but this is not an issue unless you run in to low oil pressures.
The early rods were forged, good to use for the turbo.
Don’t mix up the dipsticks!! Different years have different lengths and markings. Double check when you first put oil in the car – it should read right!!
82 and some 83 engines have different size seals in the oil pump/crank shaft area.
Oil separator (the early block had a different size hole in the block – you may need to make your hole larger to fit a turbo separator)

Interestingly enough the early blocks are all tapped for the turbo heat shields….wonder what they were thinking back then?

Chris White