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Another 930 Engine Conversion

This conversion report is a good possibility to introduce myself and my Car.
I drive the car for 14 years it`s black / black with RUF Wheels
It`s a 87-er. 930 with 4-Speed Transmission before beginning the conversion was all original.
It`s not the first conversion and rebuilding on this Car, but now i start from zero.
The Transmission I have revised five years ago and the Suspension 2 years ago.

Some pictures of the Car:

http://forums.pelicanparts.com/uploa...1404757295.jpg
http://forums.pelicanparts.com/uploa...1404757323.jpg

My Parts List:

Mahle P/C 3.4 7.5:1
964 Cams
Intercooler Longneck from Turbokraft
Tial Wastegate
Headers with heat port size 38mm from Rarly8
Turbocharger K27/29 from Rarly8
Oil feed line from Turbokraft
CIS Injector Blocks port size 36mm from Turbokraft
Rocker Shaft Set from Turbokraft
Rocker Shaft Seal Set from Turbokraft
Flyweel Clutch Set from Patrick Motorsport
Supertec Head Studs and Engine Seal Kit
High Torque Starter
D-Zug 935 Style Crankshaft Pulley
Zeitronics ZT-II
and a long List of Parts from Pelicanparts:)

The modifications I will describe during the report...

Very cool posting! Will be following with great interest... GOOD LUCK!

Sources of Information

Thanks Joe

I have used various sources of information:

http://forums.pelicanparts.com/uploa...1404833199.jpg
http://forums.pelicanparts.com/uploa...1404833215.jpg
http://forums.pelicanparts.com/uploa...1404833226.jpg

I also used my Porsche Service Manuels and not to forget the help of porsche friends.

Clutch and Flyweel removing

Tensioner, Camshaft sprocket, Chain Housing Removal

Rocker Arm, Camshaft Removal

Camshaft Housing / Heads Removal

Hi swiss fellowSmileWavy

Nice, keep going with a lot of pics.

BTW your thread is listed in the Pelican newsletter, congratulations

Always interested in this, as I've never rebuilt an engine before. #bucketlist

Thanks for all the pictures! I know you always have to remember to grab the camera instead of loosening that next fastener.

Good luck, will be watching as you go through this.

Keith

Those pics bring back memories to me. Best of luck with your rebuild!

Eric

Excellent work. Looking forward to updates

Quote:

Originally Posted by proffighter (Post 8156046)

Hi swiss fellowSmileWavy

Nice, keep going with a lot of pics.

BTW your thread is listed in the Pelican newsletter, congratulations

Hi Roland

believe me there are many more pictures:)

I have see it in the newsletter i love this section:

And check out his home-made engine and transmission stand!
he is really practical for working, the angle can be easily adjusted for removing and installing

@all

Thank you Folks

working and make some pictures are not always so easy... need some more time.
For the assembling for me as a DIY it`s a good help

Removing Air Guide Plates / Piston Cylinders /Dilavar Studs

Removing some Parts

Preparing Parts for Powder Coating

Disassembling Cylider Heads for Porting and Replacing Valve Guides

Disassembling Intake Manifold

Porting Cylinder Heads

before i bring the cylinder heads to the shop (for replacing the valve guides) i porting the Heads myself.
Intake to 36mm
Exhaust to 38mm

Intake 32 to 36mm

Intake Manifold ported to 36mm

Some Parts have arrived by Post

P/C Mahle 3.4 7:5:1

general condition is good

2 piston rings and 1 oil scraper ring were broken, it was not easy to get new one`s.
there are 2 different versions of the 3.4 liter set.
only RUF in Germany had new one.

I modified the cylinder (old school know how)

http://forums.pelicanparts.com/uploa...1405540869.jpg

http://forums.pelicanparts.com/uploa...1405540878.jpg

http://forums.pelicanparts.com/uploa...1405540888.jpg

http://forums.pelicanparts.com/uploa...1405540896.jpg

1000 pics and not even close to re-assembly:D

Nice, go on buddy!

Quote:

Originally Posted by proffighter (Post 8167568)

1000 pics and not even close to re-assembly:D

Nice, go on buddy!

:) I know I'm not the man of 1000 words but with 1000 pics

Splitting the Crankcase

Bearing Shell Main Bearings / Intermedia Shaft

Please tell why you made the cut-outs in the cylinders.

I know why we did it on two-stroke engines, but gather this is not the same.

That's a classic tuning procedure (boattailing) to relieve gas exchange or breathing between the cylinders and the crankcase (volume below the piston). According Bruce Anderson 10 more hp for a 2 liter engine. This needs also machining the crankcase like this which correspond (red) to the slots in the cylinders:

http://forums.pelicanparts.com/uploa...1406028716.jpg

http://forums.pelicanparts.com/uploa...1406029359.jpg

I do not have seen any dyno to proof, but because I don't see any downside except the work it's worth a try

Quote:

Originally Posted by proffighter (Post 8175868)

That's a classic tuning procedure (boattailing) to relieve gas exchange or breathing between the cylinders and the crankcase (volume below the piston). According Bruce Anderson 10 more hp for a 2 liter engine. This needs also machining the crankcase like this which correspond (red) to the slots in the cylinders:

I do not have seen any dyno to proof, but because I don't see any downside except the work it's worth a try

Thank you Roland for the illustration!

I have picture from the Bruce Anderson Book (German Version from Roland)
This modification was made at all the factory 2 liter racing engines.

http://forums.pelicanparts.com/uploa...1406049668.jpg

http://forums.pelicanparts.com/uploa...1406049682.jpg

http://forums.pelicanparts.com/uploa...1406049694.jpg

http://forums.pelicanparts.com/uploa...1406049707.jpg

Disassembling Crankshaft