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Julio Iniguez
Samba Member
Joined: April 19, 2004
Posts: 130
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 Posted: Sun Aug 22, 2004 5:27 pm Post subject: Okrasa find/ porsche crank, how to build it? |
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I recently found and bought a OG basketcase Okrasa motor (36horse)that has been sitting 30 years We split the case and found a clean 8 dowel 69mm crank with the EMPI stamp on it,Cool!
Also for a spare was an NOS crank, it is believed to be for a porsche.It is 8 dowel 50main and 53rod 74mm stroke,they both have the same what appears to be a manufacture stamp although I can't read them(real small). We were hoping to make it a matching porsche 74x83 that would be a fast 36horse looking motor! but the pistons and cylinders don't fit. Does anybody know what I could do? are there any early porsche P&C kits the fit on the 36 horse head stud pattern and would fit in the Okrasa heads? I remember a while back hearing about Bill Collins doing something similar,I think? If all else fails I could sell the porsche? crank and just build the 69mm stroker Okrasa,but a faster 36er would be better!
Any help is greatly appreciated, thank you. |
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coolairX2
Samba Member
Joined: September 08, 2003
Posts: 485
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| Posted: Mon Aug 23, 2004 8:59 pm Post subject: The biggest you could use on a 36 case is Porsche 912 80mm |
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My 36hp Okrasa that I am building now for my 50 split is using a stock Okrasa crank with 80mm 912 P&C's. Of course the Pistons require case and head machining. I had Rimco do both and it turned out very nice. My engine will be 1500cc when its done with a 74 Porsche crank it would be about 1600cc with the 80mm P&C's The porsche crank may require a little clearancing but should drop in.
The 912 P&C's were very expensive, don't know why really they don't seem to be anything special just Porsche prices I guess.
You can talk with Joe Ruiz [email protected] to get more information or to by these pistons and cylinder kits.
-Craig |
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Julio Iniguez
Samba Member
Joined: April 19, 2004
Posts: 130
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| Posted: Tue Aug 24, 2004 9:10 am Post subject: |
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Thank you so much Craig. That helps alot. Other than the case needing machining did the head stud pattern fit the cylinders?
Regards, Julio |
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coolairX2
Samba Member
Joined: September 08, 2003
Posts: 485
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| Posted: Tue Aug 24, 2004 1:25 pm Post subject: Yes the head studs stay in the same location. |
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They fit stock heads as well has Okrasa heads which require the stock stud location.
Of course I had case inserts put into my case just for a little extra insurance. The machining still leaves enough room for the case inserts. Any bigger than 80mm and you would have a lot of work relocating the studs.
-Craig |
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Julio Iniguez
Samba Member
Joined: April 19, 2004
Posts: 130
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| Posted: Thu Aug 26, 2004 10:40 am Post subject: |
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Right on Craig, thats what I needed to know. I'll post the final results when this project is done. Hopefully for the next Classic. Thanks again for your help!
-Julio  |
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coolairX2
Samba Member
Joined: September 08, 2003
Posts: 485
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| Posted: Wed Sep 15, 2004 6:40 pm Post subject: Julio I was wrong on the size |
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The size of the 912 Mahle cylinders are 83mm total OD of the pistons is 87mm. Sorry for the confusion.
-Craig |
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camerod
Volksfab
Joined: October 01, 2002
Posts: 606
Location: washington state
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| Posted: Wed Sep 15, 2004 9:37 pm Post subject: |
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funny, I just found/bought a 36hp okrasa stroker as well! if things really happen in threes, watch out..you may be next!
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DON'T SHIT WHERE YOU EAT! |
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BUCIOBATISTI
Samba Member
Joined: April 17, 2002
Posts: 6969
Location: San Diego, California, USA
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| Posted: Tue Sep 21, 2004 11:13 pm Post subject: |
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| camerod wrote: |
| funny, I just found/bought a 36hp okrasa stroker as well! if things really happen in threes, watch out..you may be next! |
Camerod- I would certainly qualify as the other in this group of 3. I bought a pair of 36hp Okrasa Heads with magnesium ratio rockers and then found and bought a complete 1300 TSV Kit Engine 9 days later all within the last couple months.
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coolairX2
Samba Member
Joined: September 08, 2003
Posts: 485
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| Posted: Wed Sep 22, 2004 4:35 pm Post subject: I would love to find some ratio rocker for my Okrasa. |
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Was there an ID on the maker of those rockers. Are there anyone out there making/selling ratio rockers for 36hp engines?
-Craig |
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BUCIOBATISTI
Samba Member
Joined: April 17, 2002
Posts: 6969
Location: San Diego, California, USA
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| Posted: Wed Sep 22, 2004 7:02 pm Post subject: Re: I would love to find some ratio rocker for my Okrasa. |
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| coolairX2 wrote: |
Was there an ID on the maker of those rockers. Are there anyone out there making/selling ratio rockers for 36hp engines?
-Craig |
We couldn't find any manufacturers markings on them anywhere. One friend told me that a similar product was made by EMPI and sold by both them and JC Whitney back in the day. Another friend mentioned a company named "Thomas" that made them.
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That's the best place to see the latest things we are up to as well as catch an occasional sneak peek of our latest car and parts listings! |
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