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Title: Two Cylinders, One Casting Post by: Steve DKK on August 27, 2009, 16:25:51 pm I have a hair brained idea to manufacture a single casting that would house both cylinders for a type one.
Trying to get away from long springy head studs. Has this been tried? One pattern holding the cylinger to case another pattern bolting the head to the cylinder. Increasing torque, bolt size, number of bolts and reducing the bolt length seems to be a huge advantage? Thoughts? Title: Re: Two Cylinders, One Casting Post by: louisb on August 27, 2009, 16:54:33 pm I think Pauter has done this before. I know I have seen it some where. Maybe in Keith S. interchange manual.
--louis Title: Re: Two Cylinders, One Casting Post by: jamiep_jamiep on August 28, 2009, 08:59:32 am Sounds overly complex to me.... but???
I think ARPM also did some. I think if the guys running quick times with lots of boost on here can get away with it I would be surprised if there was a need for a set of bolts for the cylinders and a set for the heads, but I'm in the KISS camp (keep it simple stoopid) of engineering so who knows. Title: Re: Two Cylinders, One Casting Post by: Griebel on August 28, 2009, 13:49:57 pm ARPM...
(http://3.bp.blogspot.com/_PK72ALI-_i0/SpfSGD2dPyI/AAAAAAAACms/iVC68_Q1Fx8/s400/siam.jpg) Title: Re: Two Cylinders, One Casting Post by: Roman on August 28, 2009, 19:53:23 pm It is called Siamese cylinders.
Title: Re: Two Cylinders, One Casting Post by: Rick Meredith on August 28, 2009, 19:54:15 pm Title: Re: Two Cylinders, One Casting Post by: Roman on August 29, 2009, 08:46:51 am Yes, it was a typo..
Title: Re: Two Cylinders, One Casting Post by: Steve DKK on August 30, 2009, 17:43:30 pm Agree this not a mass market item.
But in understand the cylinder to head seal is still a problem when cranking the boost up. Title: Re: Two Cylinders, One Casting Post by: Bruce on August 30, 2009, 19:37:07 pm Trying to get away from long springy head studs. Presumably you were looking at M10 studs. If you thought they were weak or stretchy, have you thought about 7/16" studs? M12?Title: Re: Two Cylinders, One Casting Post by: Martin on August 30, 2009, 22:11:10 pm never had any issues with mine leaking under boost.
Title: Re: Two Cylinders, One Casting Post by: Steve DKK on August 31, 2009, 00:52:06 am Hector Urias is a good friend and he had a leaker at Sacramento last month and torched a head. Had to scramble to get it welded and machined to run the next day.
7/16... Yea bigger is sometimes better but anying additional stress to the case scares me. assuming using a larger diameter stud would allow additional torque. Were there problems with the siamese cylinders? Title: Re: Two Cylinders, One Casting Post by: Jon on September 01, 2009, 10:02:29 am The stress on the case would be the same, but more bolts will spread the forces more evenly.
Title: Re: Two Cylinders, One Casting Post by: Steve DKK on September 10, 2009, 12:23:21 pm Agree, My thought was using the std head bolts to attach the cylinders to the case but shorter larger bolts to attach the head to the cylinder. Allowing for more bolt torque and the use of a real head gasket not just a copper washer.
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