|
Title: Stroker or stock height pistons Post by: andrewlandon67 on November 13, 2014, 22:36:00 pm So I'm planning on building a 1904 for my '67 bug and I was wondering if it's possible to use the stroker pistons or if I should get some standard pin height ones. Any advice is greatly appreciated!
Title: Re: Stroker or stock height pistons Post by: MattiK on November 13, 2014, 22:48:53 pm Good article http://www.aircooled.net/vw-performance-engines/ (http://www.aircooled.net/vw-performance-engines/)
Title: Re: Stroker or stock height pistons Post by: Zach Gomulka on November 13, 2014, 23:58:47 pm Stroker pistons will require longer than stock rods with a 74 crank.
Title: Re: Stroker or stock height pistons Post by: Martin S. on November 14, 2014, 04:11:57 am I built one years ago with stroker pistons but it was a low cr pig. Now it's up for rebuilding the top end and we are going for a high cr, low deck height more modern version. The A piston set is sitting there but we haven't mocked it up. The goal will be to keep the deck height at .035" to .040". Not sure what the final cr will be yet. Not sure why you're saying that Zack, did you have clearance problems with stock rods? My motor had stock Berg clearanced rods so maybe that did the trick.
Title: Re: Stroker or stock height pistons Post by: Zach Gomulka on November 14, 2014, 04:33:08 am Not clearance issues, deck height issues. A 74mm crank with stock rods and stroker pistons will have about .120" more deck than a stock engine. If you use 5.5's, that issue is reduced.
A 74mm crank with stock rods and non stroker pistons only needs .100" spacers under the cylinders. Title: Re: Stroker or stock height pistons Post by: Martin S. on November 14, 2014, 05:04:55 am I see, thanks. If you are buying the AA piston sets, the stroker ones are slipper skirt and the A ones are normal style pistons. Either ones are decent enough.
|