Another 930 Engine Conversion

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many of the parts are rusty and some rubber sealing are broken

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looks bad

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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

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all with a milling cutter

[A&F]

Awesome Project!

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I have many parts from Pelikan Members...Thank You!!!

The Mahle 3.4L full finned Pistons and Cylinders (used) come from tomdeq he converted his 930 back to stock.
The Camshafts 964 with no wear / pitting are from Anastasios also used Parts.

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I had to modify the camshaft for the 930.

left: extender for scavenge pump
right: remove power steering pump adapter

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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)

[proffighter]

1000 pics and not even close to re-assembly

Nice, go on buddy!

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Originally Posted by proffighter

1000 pics and not even close to re-assembly

Nice, go on buddy!

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

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Looks not to bad:

[jsveb]

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.

[proffighter]

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

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Originally Posted by proffighter

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.

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The bearings and surfaces are in good condition.