| [ Total Views: 855 | Total Replies: 12 | Thread Id: 106389 ] |
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 MrSpeedy
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| posted on June 18th, 2014 at 10:37 PM |
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Weird Pistons
I picked up these pistons off ebay a while back and they finally turned up in the mail. The ad was a bit vague but the price was right so I grabbed
them. They were advertised as being forged to fit "big bore VW" but the crown looks wrong to me. There are no part numbers or brand markings on them
either. They are 94mm bore and vw wristpin, just a weird dome on them. Anyone ever seen anything like them?
I might see about getting them milled flat so I can use them.
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waltermitty
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| posted on June 19th, 2014 at 09:37 AM |
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must be for something else there are only three of them.
Mitchell
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bajachris88
A.k.a.: Chris Leete
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| posted on June 19th, 2014 at 10:02 AM |
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does the crown sit nicely in a 94mm type 1 head?
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
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Camo
A.k.a.: Kev
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| posted on June 19th, 2014 at 12:49 PM |
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The problem I see is tha the crown is on the side and not at the top or bottom as required in our VW motors. I think you can have a slightly raised
on the upper side (towards top of case) to raise compression, but unless these are for a big deck height and to compensate lower compression I think
you need to look into it further.
Also, as I said I believe the raised section is in the wrong position for VW.
Kev
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MrSpeedy
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| posted on June 19th, 2014 at 01:16 PM |
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I haven't got a head spare at the moment to see how they fit unfortunatly. They might end up as shiny ash trays if they arent suitable for the 1916 I
want to build 
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Performance Upholstery
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| posted on June 19th, 2014 at 07:07 PM |
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Ask Dave butler... He'd be able to give you an explanation.
Performance Upholstery
Cars, boat seats, furniture and more!
0439002870
performanceupholstery@live.com.au
Mt Gravatt east Qld.
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 matberry
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| posted on June 19th, 2014 at 08:53 PM |
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Not VW in my opinion
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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fish26
A.k.a.: benito
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| posted on June 19th, 2014 at 09:56 PM |
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Could be VW but not air-cooled
bitten by the bug..........several times
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hulbyw
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| posted on June 19th, 2014 at 10:34 PM |
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There was an article in Hot VW's a while back where they used modified Toyota pistons in a VW engine. If I can find the mag I will post more
details
Cheers......Wayne
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 helbus
A.k.a.: Pete S
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| posted on June 19th, 2014 at 10:50 PM |
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Check the deck height and the compression ratio that will be achieved based on the head cc. Were rings included?
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modnrod
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| posted on June 20th, 2014 at 12:24 PM |
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Mill the piston top flat, then it looks just right.
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hulbyw
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| posted on June 20th, 2014 at 05:53 PM |
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Found the HotVW's mag. The Toyota pistons actually have a negative dome piston, so completely different to the ones you have bought. They are cast
not forged. Article mentions about wrist pin offset which is something you may need to consider
Cheers.Wayne
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on July 16th, 2014 at 08:41 AM |
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Yes those are made for AC VW and others too.
Making a big cam fit is bogus, and the lump is right in the way.
Make sure the gudgeon pin is in the right way, it should be solid on one end.
| Quote: | Originally
posted by westi
That's mad Alan.
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