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Typ_315
Samba Member
Joined: April 23, 2006
Posts: 51
Location: California, USA
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 Posted: Sun Nov 18, 2012 10:01 am Post subject: Building a 78.4 mm x 90.5 mm Engine |
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Hi All,
I am new to the stroker engine scene, but I am in the middle of building a 2006 cc engine which has a 78.4 mm stroke and 90.5 mm bore.
The engine is assembled in a short block form, with Scat 5.5" vw journal rods. The block was decked for the larger pistons / barrels also.
My question is, what type of pistons / barrels are required? There is the 90.5 A and 90.5 B, and I am not sure about any of it?
Thanks in advance! |
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DarthWeber
Samba Member
Joined: November 24, 2007
Posts: 7543
Location: Whittier,CA
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| Posted: Sun Nov 18, 2012 10:07 am Post subject: |
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 Ummmm.........the middle of an engine build isn't really the time to ask that kind of a question.
You want "B" stroker pistons. 
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| Mitey62 wrote: |
| Swapped the Compufire for a Bosch blue and some points I had sitting around, started 1st crank. Took her out for a drive, pulls harder, more RPM, and runs smoother. I think I'll be sticking with points from now on. |
| RockCrusher wrote: |
| JB weld the case halves....that'll keep the fretting to a minimum. |
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Typ_315
Samba Member
Joined: April 23, 2006
Posts: 51
Location: California, USA
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| Posted: Sun Nov 18, 2012 10:33 am Post subject: |
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I know!!! But I fell into like most people and now just want it over  I see it every day when I walk through the garage.
Next question, where can I get these guys, no one seems to have them... Would like Mahle or Cima |
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DarthWeber
Samba Member
Joined: November 24, 2007
Posts: 7543
Location: Whittier,CA
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| Posted: Sun Nov 18, 2012 11:58 am Post subject: |
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http://vwparts.aircooled.net/Piston-Cylinder-Set-90-5mm-x-78-84mm-Forged-p/mahlet190bf.htm
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| Mitey62 wrote: |
| Swapped the Compufire for a Bosch blue and some points I had sitting around, started 1st crank. Took her out for a drive, pulls harder, more RPM, and runs smoother. I think I'll be sticking with points from now on. |
| RockCrusher wrote: |
| JB weld the case halves....that'll keep the fretting to a minimum. |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
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| Posted: Sun Nov 18, 2012 12:04 pm Post subject: |
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Cima and Mahle are now the same company.
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2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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Quokka42
Samba Member
Joined: December 02, 2010
Posts: 3117
Location: Melbourne, Australia
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| Posted: Sun Nov 18, 2012 12:55 pm Post subject: |
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| Or there is the AA hypereutectic for about half the price. I have heard that "forged" in the Mahles actually refers to vacuum forged - hence the same manufacturing process. If you are building a turbo you might want to step up to the "true forged." The high silicon in the hypereutectic makes for a very strong and hard piston, but it can be a little "brittle" by turbo standards. |
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neil68
Samba Member
Joined: March 17, 2007
Posts: 3440
Location: Calgary, Canada
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| Posted: Sun Nov 18, 2012 3:02 pm Post subject: Re: Building a 78.4 mm x 90.5 mm Engine |
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| Typ_315 wrote: |
Hi All,
I am new to the stroker engine scene, but I am in the middle of building a 2006 cc engine which has a 78.4 mm stroke and 90.5 mm bore.
The engine is assembled in a short block form, with Scat 5.5" vw journal rods. The block was decked for the larger pistons / barrels also.
My question is, what type of pistons / barrels are required? There is the 90.5 A and 90.5 B, and I am not sure about any of it?
Thanks in advance! |
A 78.4 x 90.5 engine is a 2017 cc. You need B pistons for the simplest assembly, I prefer Mahle. I built a 78.4 x 90.5 with 5.5" CB rods and was very happy with it. A great cruiser, plus enough pep to have fun at the Friday night street legal races, depending on camshaft/heads. 
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Neil.
Der Kleiner Rennwagens
68 Beetle 2332 cc, 204 WHP
12.5 seconds @ 107 mph
Dynojet Test: https://www.youtube.com/watch?v=M9B_H3eklAo |
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RailBoy
Samba Member
Joined: March 10, 2008
Posts: 2904
Location: Virginia
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| Posted: Sun Nov 18, 2012 3:34 pm Post subject: |
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neil68, looking into that 2017 machine, tell us some back ground could ya,lol??
Yea, figure if I go that deep for a 1849, who knows, but want to be realistic, know how much a long lasting 2110 runs..... Both ways,lol... RB
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[quote="smitty24"]"HELP, I ported my own heads and now have fire coming out my ass" .[/quote]
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