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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1466 Location: San Carlos, CA
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Posted: Fri Nov 12, 2010 3:08 pm Post subject: Through bolt |
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Hello-
I understand that Porsche 356 cases use a 'through bolt' to help hold the case together.
Is it possible to modify a 36HP case to use a through bolt?
If so, what's the benefit?
Thanks,
Paul _________________ "I would rather have questions that can't be answered than answers that can't be questioned."
Richard Feynman |
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oval56 Samba Member
Joined: July 21, 2003 Posts: 1309 Location: oktoberfest maintown
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Posted: Fri Nov 12, 2010 3:23 pm Post subject: |
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you can tighten the case better without pulling the bolt out (torque should be right)
the mechanical threatment in the area of the bolt in the case is hard... so doing it like porsche is the better way... i missed it on my engine, will do it on my next....
no problem in doing it on a 36hp case or 30hp case... _________________ www.oval56.com
1956 Oval, 2364ccm typ4
1957 Oval Ragtop 1584ccm singel port modified
1950 Hebmüller, 1584ccm okrasa modified
DBK Germany!!!!!!!!!!
www.dbkvw.com |
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sleef Samba Member
Joined: June 16, 2009 Posts: 16 Location: New Zealand
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Posted: Fri Nov 12, 2010 6:44 pm Post subject: |
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Hi
I was just wondering if though bolting the case can limit the maximum amount the case may be bored for larger cylinders / interfere with the cylinder spigot on larger bores??
Cheers Frank _________________ 1966 RHD blue bug, 2276 ITB's |
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earthquake Samba Member
Joined: January 10, 2008 Posts: 3984 Location: SANDY VALLEY, NEVADA
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Posted: Sun Nov 14, 2010 12:36 pm Post subject: |
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Any body have a picture of this? are you talking about the 6 studs that clamp the case around the main bearings? this sound like a good idea to me.
Casey _________________ 74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison] |
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OMT Samba Member
Joined: January 18, 2004 Posts: 296
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Posted: Sun Nov 14, 2010 11:17 pm Post subject: Girdle Bolts for two Piece Case |
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Hallo,
It ain't no big deal......the problem is getting the Porsche Through Bolts and the sealing washers.
Hope this helps!
BTW Two Piece case and 3 Piece case Porsche are a little bit different!
Best Regards,
Al |
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Russ Wolfe Samba Member
Joined: October 08, 2004 Posts: 25187 Location: Central Iowa
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Posted: Mon Nov 15, 2010 5:22 am Post subject: |
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How close in length are they to the Type 4 bolts. That could be a source.
I have a couple coffee cans full, where I have parted out engines. _________________ Society is like stew. If you don't keep it stirred up, you end up with a lot of scum on the top!--Edward Abbey
Gary: OK. Ima poop. |
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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1466 Location: San Carlos, CA
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Posted: Mon Nov 15, 2010 10:17 am Post subject: |
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Hello-
Quote: |
......the problem is getting the Porsche Through Bolts and the sealing washers. |
LN Engineering sells thru bolt kits for $25.
Stoddard has the bolts as well as the o-rings, washers, and nuts.
http://www.stoddard.com/shop/shopdisplayproducts.asp?id=43&cat=Engine+%28misc%2E+parts%29
Here are a few pics of a Pre-A case with thru bolts.
Paul _________________ "I would rather have questions that can't be answered than answers that can't be questioned."
Richard Feynman
Last edited by gimmesomeshelter on Mon Nov 15, 2010 4:47 pm; edited 1 time in total |
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Rwoodshvac Samba Member
Joined: March 21, 2010 Posts: 202 Location: VA
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Posted: Mon Nov 15, 2010 4:23 pm Post subject: |
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I am in the middle of my project and may consider this. It appears in the pictures that the two middle studs are converted to Thru bolts not all 6. Is this the case?
If so in my thinking it seems that the middle studs would have less engine stress than the outer studs. from the engine into the flywheel and from the engine pulley to the generator and fan.
Whats the idea behind just the two center studs? _________________ 57 Ragtop Semaphore Sedan
48 Aluminum Case drilled tapped, Full Flow Filter
Porsche 356 B Crankshaft 74mm
Porsche 356 B Rods
Shasta Cylinders with JE Pistons 80mm
WW Okrasa Heads worked by Ron Chuck
Speedwell Ratio Rockers 1.25
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Blackline Racing Lifter Inserts, Manton Push Rods
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Gene Burg Sump
Fram bypass Filter with Okrasa Oil Cooler |
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Roadcow Samba Member
Joined: November 14, 2003 Posts: 1012 Location: Stockton, Ca. area
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Posted: Mon Nov 15, 2010 5:14 pm Post subject: |
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Remember the Oil galley the bolts go through. _________________ 71 Westy Roadcow
67 Panel
63 Bug
66 Ghia Bonneville 2014
74 Ghia Vert
69 Bonneville Ghia 150 in Chico
69 Bonneville Ghia in Ireland
80 Cabby 2.1 16v
98 Passat |
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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1466 Location: San Carlos, CA
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Posted: Mon Nov 15, 2010 5:16 pm Post subject: |
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Hello-
Yes, I was just thinking of that. Don't forget the o-rings.
Paul _________________ "I would rather have questions that can't be answered than answers that can't be questioned."
Richard Feynman |
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splitpile Samba's Worst Speller
Joined: May 03, 2000 Posts: 5927 Location: back to living where hell meets the suface
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Posted: Tue Nov 16, 2010 6:16 pm Post subject: |
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I'll get some pics of my case next time I go to Ollies. They welded up the area under the cooler mount and machined a flat surface for it to seal against.
The bottom bolt was done like a 356.
Guess it's time to get it together but we're still brain farting how to make roller tip cam followers work _________________ Stocking distributor of "The Funky Green Panels"
www.BUSTORATION.com metal and more for your bus
"no more hacking my sig line" |
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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1466 Location: San Carlos, CA
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Posted: Tue Aug 01, 2017 5:32 pm Post subject: Re: Through bolt |
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I'm going to talk to a machinist this Friday about installing a through (thru?) bolts. My big concern is that they seem to pierce the oil galleries. If I want to do this, how do I make sure 1) i don't block the oil passages, and 2) I don't shoot oil out of the sides of my engine?
BTW, here's a pic of a dual port case.
Has anyone seen a comparable picture of a 36HP case?
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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OMT Samba Member
Joined: January 18, 2004 Posts: 296
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Posted: Tue Aug 01, 2017 11:58 pm Post subject: Re: Through bolt |
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Hello Paul,
First of all, do you really think you need this modification?
Think about the horsepower your little engine will make.
When do you want to drive your little "Vintage" performance engine.
It's really great to have these little "tricks" incorporated into your engine build,
is it really worth the time searching and posting; while the parts sit waiting for the latest "Trend".
I think we have been talking for 5 years+. Maybe it's time to get something together.
Forgive for me for being an A-hole. Maybe you already have an 100 plus horsepower two piece engine. Think about it.
Best Regards,
Al |
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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1466 Location: San Carlos, CA
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Posted: Wed Aug 02, 2017 12:18 am Post subject: Re: Through bolt |
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Thanks for the response.
Regarding the long period of time I've been collecting parts, much of that has to do with unforeseen financial issues.
Two layoffs.
Dog 1# knee surgery ~6-7K
Dog 2# back surgery ~8-9K
Dog 1# 2nd knee surgery only 6K
Dog 1 cancer treatment (amputation and chemo). Don't ask.
Daughter's upcoming wedding.
Like my signature say, my vet has all my car money.
Cheers,
Paul _________________ "I would rather have questions that can't be answered than answers that can't be questioned."
Richard Feynman
Last edited by gimmesomeshelter on Wed Aug 02, 2017 8:13 am; edited 1 time in total |
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OMT Samba Member
Joined: January 18, 2004 Posts: 296
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Posted: Wed Aug 02, 2017 12:26 am Post subject: Re: Through bolt |
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Hello Paul,
Sorry to hear about the difficult situations life has presented to you.
I hope you can forgive me for the blunt comments.
Best Regards,
Al
P.S. I'll PM my contact if you want to converse, I have no secrets. |
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