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Robert Chambers
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Joined: August 11, 2005
Posts: 216
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 Posted: Wed Apr 15, 2015 2:07 pm Post subject: 77 MM Pistons |
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Does anyone know if type 4 77mm domed pistons can be used for a 1200 36 HP build using stock cylinders? Has anyone tried that combination? I recently found 2 piston. The box is marked HEPOLITE REF SW 12786 77 M/M Type 4 Volkswagen.
Thanks,
Bob
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Last edited by Robert Chambers on Thu Apr 16, 2015 11:08 am; edited 1 time in total |
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Slow 1200
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Joined: July 02, 2004
Posts: 2105
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| Posted: Thu Apr 16, 2015 1:07 am Post subject: |
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| 77mm pistons don't sound like type 4....the smallest I've read about is the 87,5mm ones for the 1600cc Super Vees |
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grueni
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Joined: November 03, 2008
Posts: 582
Location: Germany
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| Posted: Thu Apr 16, 2015 3:09 am Post subject: |
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If you mean typ1. Than yes. They can be used if they are 40hp 1200. the 77 1300 are not that easy.l 22mm piston pin!
The compression hight is little different. But i like it more when the piston backspace is little lower. 1-1.2mm in such a combo is perfekt.
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Robert Chambers
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Posts: 216
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| Posted: Thu Apr 16, 2015 4:22 am Post subject: |
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I also thought 77 MM was only made for 1200 36 & 40 HP with the smaller piston pins. The box that the pistons came in is made to hold 4 pistons. Maybe that is why the number 4 is present on the box?
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'63 OG 117 Herbie Replica
'56 Euro Oval Deluxe
'52 Standard Zwitter
'63 OG 117 |
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fcampbell356
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Joined: December 15, 2007
Posts: 217
Location: Pensacola, Florida
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| Posted: Thu Apr 16, 2015 12:06 pm Post subject: Pistons |
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@ Slow 1200,
Yes, When we switched over from F VEE to Super V we started with the Type 3
engine and then later used the Type 4, with the 87.5mm piston & cylinders to make it a 1.6 that were supplied from VWOA from their racing director Mr. Hoppen. |
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Robert Chambers
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Joined: August 11, 2005
Posts: 216
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| Posted: Thu Apr 16, 2015 6:41 pm Post subject: |
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These are the pictures of the pistons and the box they came in.
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'63 OG 117 Herbie Replica
'56 Euro Oval Deluxe
'52 Standard Zwitter
'63 OG 117
Last edited by Robert Chambers on Fri Apr 17, 2015 5:47 pm; edited 2 times in total |
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GTV
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Joined: March 27, 2004
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Location: Si'ahl
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| Posted: Thu Apr 16, 2015 7:25 pm Post subject: |
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What is the diameter of the piston pin?
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Robert Chambers
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Joined: August 11, 2005
Posts: 216
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| Posted: Thu Apr 16, 2015 7:35 pm Post subject: |
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Piston pin diameter is 20 MM
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Robert Chambers
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Joined: August 11, 2005
Posts: 216
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| Posted: Sun Apr 19, 2015 5:56 am Post subject: |
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I am hoping some of the 36 HP Challenge Racers chime in with some information about these pistons! Anybody? 
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'63 OG 117 Herbie Replica
'56 Euro Oval Deluxe
'52 Standard Zwitter
'63 OG 117 |
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wokokow
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Joined: August 13, 2012
Posts: 27
Location: Nairobi, Kenya
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| Posted: Sun May 02, 2021 6:25 am Post subject: Re: 77 MM Pistons |
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| Did they work? |
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Robert Chambers
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Joined: August 11, 2005
Posts: 216
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| Posted: Tue May 04, 2021 7:00 am Post subject: Re: 77 MM Pistons |
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| wokokow wrote: |
| Did they work? |
Unfortunately do to health problems, I have not done much work on any projects for the last year. I am being treated for Psoriatic Arthritis. What is really strange is I must have had it and not known it for years. At 70 I started having major pain and then Shingles about a year ago. I am getting meds including infusions. Hopefully I will be able to get back in the shop full time soon.
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Alstrup
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