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Building a bullet proof lower end for Porsche 951 (Read 866 times)
Fetzig
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Building a bullet proof lower end for Porsche 951
Aug 9th, 2018 at 11:59pm
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For you guys in the know, I would like to know what machine shop options I should plan for my Porsche 951 lower end that I am stroking with a NOS 3.0 liter crank to be built up next year. I am looking at Lindsey to do the lower end with forged pistons and connecting rods, since they can pretty much supply everything to do the job.
Question is to what extent of machine work should you go to bullet proof the lower end.  For example, piston squirters, doweling the girdle, machining the windage for no 2 cylinder which gets oil starved, cross drilling the crank.  Do you think lightening the crank is a good idea?  Adding a scraper to shed the oil off the crank seems like a good idea, or would a dry sump be a better idea.

What about an o-ringed head gasket, is this a novelty or does it add extra protection against head lift.

Any other suggestions?  I only have one chance at this, so I want to get it right the first time through.

Thanks in advance
  
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jockellis
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Re: Building a bullet proof lower end for Porsche 951
Reply #1 - Aug 19th, 2018 at 12:51am
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I have no idea but out of curiosity, what are you going to do with it?
  

Jock Ellis: White 1988 944 NA, '73 914 1.7 project, '72 parts car, '68 912 engine (basket case); Gone but not forgotten: '68 912, '72 914-6, '73 914 1.7, '64 1600 SC Coupe, '60 1600 Super Roadster
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kyle_944
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Re: Building a bullet proof lower end for Porsche 951
Reply #2 - Sep 28th, 2018 at 9:50pm
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I would stray away from an o-ringed head. If your plan is a bulletproof bottom end, don’t make that the point of failure.

I’d rather do a headgasket than rebuild a bottom end or replace the block.
  

‘83 944 N/A AT 108K rebuilt and long gone
‘84 944 N/A Five Speed Black/Tan, sold.
‘89 944 Turbo M030 M220 Schwarz Sleeper
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Noah
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Re: Building a bullet proof lower end for Porsche 951
Reply #3 - Sep 29th, 2018 at 6:34am
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#1 - Send your rods to Michael Mount to do the bearing upgrade.

#2 - Dry sump all day long if you got the bucks.
  

non-purist retro-grouch with questionable taste
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