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Piston clearance for a stroker crank
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Gnarlyleech
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PostPosted: Sat Jul 07, 2012 8:46 pm    Post subject: Piston clearance for a stroker crank Reply with quote

I need to cut away part of my piston to clear the crankshaft. What is the best way to do this? I guess I need to get a scale to keep the weight the same on all 4 piston.

I marked the spot I need to cut.
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MURZI
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PostPosted: Sat Jul 07, 2012 9:24 pm    Post subject: Reply with quote

What are you building?? Bore? Stroke?? Without proper pin height those pistons are gonna stick way out of the cylinders....
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Gnarlyleech
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PostPosted: Sat Jul 07, 2012 9:29 pm    Post subject: Reply with quote

Sorry for excluding the details.
1300 case
74mm crank
77mm P&C (stock 1300)

They do stick way out of the cylinders. I am setting my deck height with .100" of shims to get .040". I got all that under control now though. I am just wondering about cutting away part of the piston skirt for clearance at BDC. I searched but I have not found any pictures of this.
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PostPosted: Sat Jul 07, 2012 10:21 pm    Post subject: Re: Piston clearance for a stroker crank Reply with quote

http://www.thesamba.com/vw/forum/viewtopic.php?t=472324
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Gnarlyleech
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PostPosted: Sat Jul 07, 2012 10:23 pm    Post subject: Reply with quote

Exactly what I was looking for John. Thanks
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mark tucker
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PostPosted: Sat Jul 07, 2012 10:28 pm    Post subject: Reply with quote

die grinder with a carbide bit for aluminum, or just a belt sander.be sure to not chamfer the edge as that can lead to a smoking motor,as it will "funnel "more oil than the oil rings can handle, the piston is slightly sharp there so it sheers off the oil from the cylinder, the clearance will let the proper amount stay on them.good luck and have fun.
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bugguy076
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PostPosted: Sun Jul 08, 2012 3:45 am    Post subject: Reply with quote

Only remove what you have to. .050 clearance is enough. I agree, keep the edges sharp. Re-balance the weight of the pistons after they are trimmed.
Sounds like a fun little engine.
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Gnarlyleech
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PostPosted: Sat Aug 18, 2012 7:54 pm    Post subject: Reply with quote

Did this yesterday. I went to habor freight and bought a balance scale. I balanced all of them today and started assembly. It is coming together nicely so far.
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