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Low Bräu Samba Member
Joined: December 12, 2003 Posts: 346 Location: Merritt Island, FL
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Posted: Tue Aug 18, 2015 1:48 pm Post subject: Boring Porsche 82.5 cylinders |
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Who here has had success boring out 82.5 mm Porsche 356 cast iron cylinders to 83 mm in order to fit pistons from a 40HP big bore kit? I spoke to my machinist today who was a little concerned about boring the cylinders such a small amount and keeping them round. Especially if the cylinders are very worn to start with. He said he could try it but no guarantees it would work out as planned. He's familiar with VW and Porsche motors so I trust his advice. I was expecting him to say that it would be an easy job but he didn't sound very confident about doing it.
Thanks
Josh _________________ Independent German Auto
671 Fern Drive
Merritt Island, FL 32952
(321) 449-4665
Specializing in repair and maintenance for Porsche, BMW, Mini, Audi, and Volkswagen.
1952 Standard Beetle
1960 SO-23 Westfalia
1961 L-380 Turkis Deluxe Beetle
1985 Vanagon Country Homes Camper (work in progress - EG33 swap) |
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Low Bräu Samba Member
Joined: December 12, 2003 Posts: 346 Location: Merritt Island, FL
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Posted: Wed Aug 19, 2015 3:38 pm Post subject: |
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So no one here has tried this? Anyone? Bueller? Bueller? _________________ Independent German Auto
671 Fern Drive
Merritt Island, FL 32952
(321) 449-4665
Specializing in repair and maintenance for Porsche, BMW, Mini, Audi, and Volkswagen.
1952 Standard Beetle
1960 SO-23 Westfalia
1961 L-380 Turkis Deluxe Beetle
1985 Vanagon Country Homes Camper (work in progress - EG33 swap) |
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alanhall Samba Member
Joined: February 18, 2006 Posts: 115 Location: Northern California
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Posted: Wed Aug 19, 2015 3:41 pm Post subject: |
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Back in the day Ray Litz (competition Engineering) bored some 82.5 912 cylinders to 83 to use a set of oversize pistons. No trouble at all. |
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Mr. Motorhead Mad Scientist
Joined: January 06, 2004 Posts: 717 Location: Practitioner of 36hp alchemy
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Low Bräu Samba Member
Joined: December 12, 2003 Posts: 346 Location: Merritt Island, FL
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Posted: Thu Aug 20, 2015 2:13 pm Post subject: |
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Mr. Motorhead wrote: |
Why not use the Porsche pistons as well if you have them? Get a set of AA performance H beams with the 22mm small end and you are all set. |
It's not that easy, the pistons and jugs are well worn and used up. Also the pistons are not right for the job. They are domed and have valve reliefs. I suppose one could make them work but they are not right for my project. I have a call in to another machinist, just waiting for a call back. _________________ Independent German Auto
671 Fern Drive
Merritt Island, FL 32952
(321) 449-4665
Specializing in repair and maintenance for Porsche, BMW, Mini, Audi, and Volkswagen.
1952 Standard Beetle
1960 SO-23 Westfalia
1961 L-380 Turkis Deluxe Beetle
1985 Vanagon Country Homes Camper (work in progress - EG33 swap) |
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mark tucker Samba Member
Joined: April 08, 2009 Posts: 23937 Location: SHALIMAR ,FLORIDA
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Posted: Thu Aug 27, 2015 9:12 am Post subject: |
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should be no issue if he has the right equipment to do it with. if it's wore a lot you center up in the highest wear aera or close to it. or just hone over size.use torque plates if possiable. |
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Low Bräu Samba Member
Joined: December 12, 2003 Posts: 346 Location: Merritt Island, FL
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Posted: Sun Aug 30, 2015 12:33 pm Post subject: |
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Cool, that's what I was expecting to hear. Thanks, Mark. _________________ Independent German Auto
671 Fern Drive
Merritt Island, FL 32952
(321) 449-4665
Specializing in repair and maintenance for Porsche, BMW, Mini, Audi, and Volkswagen.
1952 Standard Beetle
1960 SO-23 Westfalia
1961 L-380 Turkis Deluxe Beetle
1985 Vanagon Country Homes Camper (work in progress - EG33 swap) |
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mark tucker Samba Member
Joined: April 08, 2009 Posts: 23937 Location: SHALIMAR ,FLORIDA
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Posted: Mon Aug 31, 2015 11:40 am Post subject: |
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remember boring 1/2 mm is only .010" per side, so...it kinda needs to be centered pretty close in the high wear area if there wore a lot, but thats done when your are boring. honing over size is hard to re center as it will fallow the exzisting(orignal) bore for the most part. cylinders rarly wear the same all the way around. |
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TomSimon Samba Member
Joined: January 13, 2004 Posts: 749
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Posted: Mon Oct 26, 2015 7:55 am Post subject: |
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If your local machinist is using phrases like "I don't know if I can keep them round... too thin... no guarantees..." stuff like that, he doesn't want the work, the headache, the risk, etc, find another guy.
Or just call Matt,(Mr. Motorhead) above ^^^^ |
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Mr. Okrasa Original Old Speed
Joined: May 20, 2000 Posts: 726 Location: Eastside, Costa Mesa. So. Califas...Loco's ;-)
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[email protected] Samba Member
Joined: June 24, 2015 Posts: 715 Location: Rialto. CA
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Posted: Fri Aug 31, 2018 2:22 pm Post subject: Re: Boring Porsche 82.5 cylinders |
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Ok folks im looking for info and thoughts ...i got a good deal on some porsche 356 1500cc 3 piece case 80mm aluminum cylinders these I know can be open up for 83mm pistons...im not building a 36hp okrasa but a 40hp okrasa and was thinking of using them what are your thoughts it's just I'm a big fan of the aluminum cylinders than cast iron .. do you guys thinking I would have any problems ????? |
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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1468 Location: San Carlos, CA
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Posted: Fri Aug 31, 2018 3:35 pm Post subject: Re: Boring Porsche 82.5 cylinders |
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Are the aluminum cylinders plated or do they have a cast iron liners?
Cheers,
Paul _________________ "I would rather have questions that can't be answered than answers that can't be questioned."
Richard Feynman |
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Danwvw Samba Member
Joined: July 31, 2012 Posts: 8892 Location: Oregon Coast
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[email protected] Samba Member
Joined: June 24, 2015 Posts: 715 Location: Rialto. CA
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Posted: Fri Aug 31, 2018 4:14 pm Post subject: Re: Boring Porsche 82.5 cylinders |
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gimmesomeshelter wrote: |
Are the aluminum cylinders plated or do they have a cast iron liners?
Cheers,
Paul |
These porsche 1500cc "A" 80mm were used for a bit from 1955 -1957 so there more rare not seen as much ...there all aluminum ..no cast iron liners .... |
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Danwvw Samba Member
Joined: July 31, 2012 Posts: 8892 Location: Oregon Coast
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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1468 Location: San Carlos, CA
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Posted: Fri Aug 31, 2018 5:33 pm Post subject: Re: Boring Porsche 82.5 cylinders |
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If they're all aluminum, you'll have to replete them after they're opened up. The last time I checked (10 years ago), the plater LN uses charged $1000 for a set of 4 cylinders.
Cheers,
Paul _________________ "I would rather have questions that can't be answered than answers that can't be questioned."
Richard Feynman |
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[email protected] Samba Member
Joined: June 24, 2015 Posts: 715 Location: Rialto. CA
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Posted: Fri Aug 31, 2018 5:56 pm Post subject: Re: Boring Porsche 82.5 cylinders |
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gimmesomeshelter wrote: |
If they're all aluminum, you'll have to replete them after they're opened up. The last time I checked (10 years ago), the plater LN uses charged $1000 for a set of 4 cylinders.
Cheers,
Paul |
So do you see any problems useing theses on a 40hp case .. I know lots will say buy 40hp 83mm cylinders or type2 /3 1500cc 83 cylinders.
But I have these aluminum ones and was thinking hey why not ... I know I would have to modify the cylinders a bit for the head studs... but notice there would be a bigger opening between them would it be a problem ... |
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