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Gnarlyleech
Samba Member
Joined: April 23, 2012
Posts: 222
Location: Southwest Louisiana
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 Posted: Sat Jul 07, 2012 8:46 pm Post subject: Piston clearance for a stroker crank |
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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
Samba Member
Joined: August 25, 2005
Posts: 5063
Location: Madisonville, La
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| Posted: Sat Jul 07, 2012 9:24 pm Post subject: |
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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
Samba Member
Joined: April 23, 2012
Posts: 222
Location: Southwest Louisiana
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| Posted: Sat Jul 07, 2012 9:29 pm Post subject: |
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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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"Good judgment comes from experience and a lot of that comes from bad judgment"
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[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
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| Posted: Sat Jul 07, 2012 10:21 pm Post subject: Re: Piston clearance for a stroker crank |
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http://www.thesamba.com/vw/forum/viewtopic.php?t=472324
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Gnarlyleech
Samba Member
Joined: April 23, 2012
Posts: 222
Location: Southwest Louisiana
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23927
Location: SHALIMAR ,FLORIDA
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| Posted: Sat Jul 07, 2012 10:28 pm Post subject: |
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| 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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Joined: December 11, 2007
Posts: 1068
Location: Dover, PA.
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| Posted: Sun Jul 08, 2012 3:45 am Post subject: |
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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
Samba Member
Joined: April 23, 2012
Posts: 222
Location: Southwest Louisiana
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| Posted: Sat Aug 18, 2012 7:54 pm Post subject: |
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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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