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swanlakers
Samba Member
Joined: July 17, 2005
Posts: 370
Location: Lost in space
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 Posted: Sun May 06, 2018 4:44 pm Post subject: Back in the day, backyard engineering for okrasa motor |
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Basic parts from okrasa, linkage is all homemade, clearly to me this was a old build with the items locally available.
basic lay out, removed from corroded block a decade ago.
Brass bar, unknown link joint
The other end
Assembled from aluminum sheet and toilet flush parts
Don’t drill, just bash a hole, put a big washer behind
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OMT
Samba Member
Joined: January 18, 2004
Posts: 296
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| Posted: Sun May 06, 2018 10:05 pm Post subject: Re: Back in the day, backyard engineering for okrasa motor |
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Hello Swanlakers,
Nice photos, hope your projects are doing well. “Ya gotta do what ya gotta do!”
Best Regards,
Al |
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TomSimon
Samba Member
Joined: January 13, 2004
Posts: 751
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| Posted: Mon May 07, 2018 8:51 am Post subject: Re: Back in the day, backyard engineering for okrasa motor |
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It's kind of fun to look at things that people used to cobble together. When I was growing up, the word on the street was "Dual carbs, baaaaad, can't keep them tuned" After working on 4 cylinder motorcycles and learning to tune them from a couple top-rate mechanics, seeing the oem factory Kawasaki and Honda linkages (that worked great, btw). Same with the early T3 linkage, which worked sort of ok, as long as it wasn't bent. 356 cross bar linkage worked decent, too.
I figured out why people learned to dislike dual carbs on VW's. The linkage was crap. More accurately, the cheap linkage that came in most kits was crap. If you've ever tried to tune an old set of Kadrons, where the carbs are both the same hand, you understand that sync the carbs when it warm, means when it gets hot they are out of tune. Sync them hot, and during cold morning start ups, the car ran like crap, way out of sync. So you tune them hot, after the engine has fully expanded, but the steel linkage bar only expands 1/3rd as much, and live with cold and warm conditions. An exception was Berg linkage, which most people wouldn't spend the money on.
If you're going to use rods for longer links, don't have them 'push'. If you must have them push, use a tube, which has stiffness because of it's diameter, doesn't flex like a bow saw when pushed.
_________________
2-time NASA Pro Racing Champion, Bonneville 130 Club and 150 Club Memeber, BRS Pro Gas racer |
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56samba
Samba Member
Joined: June 25, 2015
Posts: 262
Location: Germany
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| Posted: Mon May 07, 2018 11:42 pm Post subject: Re: Back in the day, backyard engineering for okrasa motor |
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| swanlakers wrote: |
Basic parts from okrasa, linkage is all homemade, clearly to me this was a old build with the items locally available.
basic lay out, removed from corroded block a decade ago.
Brass bar, unknown link joint
The other end
Assembled from aluminum sheet and toilet flush parts
Don’t drill, just bash a hole, put a big washer behind
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Thanks for sharing the pics!
Do you plan to build an engine? I would keep everything as is and look for a longblock.
That's pure history!
Don't want to hijack your topic... I also have a homemade Okrasa linkage that is similar to the 356 linkage. Oh well on Tuesday I found some manifolds that were built to mount another linkage, I guess to prevent the synchronization issues.
Jan |
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swanlakers
Samba Member
Joined: July 17, 2005
Posts: 370
Location: Lost in space
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