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Try not, Do or Do not
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2.7 7R case converted to 2.0
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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Registered User
Join Date: Jul 2003
Posts: 721
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Good work!
![]() Can you sleeve the ports of 2.8RSR heads? |
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Try not, Do or Do not
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Quote:
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,732
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Oh, THAT ROCKS. How much?
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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up-fixing der car(ma)
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Awesome stuff Henry...!
Can you give out any details or is this top-secret? ![]()
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Scott Kinder kindersport @ gmail.com |
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Join Date: Feb 2003
Location: ....down Highway 61
Posts: 6,449
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Brilliant!
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Registered User
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Henry,
What about the different expansion rates of the metals? Has there been any long term testing? What do you use to "glue" the "insert" in? Looks nice.
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Chad Plavan 911ST Race Car/2.5L SS Race Motor #02 1972 911T- Numbers matching- Restoring to stock 2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold) 2016 Elan NP01 Prototype racecar- Chassis #20, #02 |
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Try not, Do or Do not
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As with all other modifications we choose to explore, we thought of that and did some research. What we found was that the difference in the expansion coefficient is very little.
It is almost impossible for us to calculate the true expansion coefficient of the magnesium because we don't know the alloy mix but pure magnesium is around 26.1 x 10-6/K and we know it's an alloy so the EC should be lower. The Expansion Coefficient of aluminum is 20.4-25.0 x 10-6/K depending on alloy mix. As you can see it's very close so it should and has had no noticeable effect. As for glue: not being adhesive engineers we thought it prudent to seek the help of one. We called E. V. Roberts, an aerospace composites company, and got some advise. Their engineer recommended an adhesive that they use to bond carbon fiber to aluminum. Two completely different materials with two completely different ECs. That is the adhesive we chose. At this time we have this modification in three engines [one a 2.0 race engine] now for over two years.
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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Author of "101 Projects"
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That is very cool indeed! I can't imagine too many cases (pun intended) where people would want to remove horsepower from their engine, but I'm sure for racing circuits there is indeed an application for it.
-Wayne
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Wayne R. Dempsey, Founder, Pelican Parts Inc., and Author of: 101 Projects for Your BMW 3-Series • 101 Projects for Your Porsche 911 • How to Rebuild & Modify Porsche 911 Engines • 101 Projects for Your Porsche Boxster & Cayman • 101 Projects for Your Porsche 996 / 997 • SPEED READ: Porsche 911 Check out our new site: Dempsey Motorsports |
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up-fixing der car(ma)
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I had a set of 2.5L Long-stroke Mahle P/C (86.7mm, 10.3:1 C/R, 911ST parts), and the spigot would have to be 94.1mm to run those. Many interested parties were interested at first, but not after they find out about the necessary spigot mod. This would allow people to run that set and take their case back to stock if desired (duh). Just felt like sharing!
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Scott Kinder kindersport @ gmail.com |
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up-fixing der car(ma)
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I had a set of 2.5L Long-stroke Mahle P/C (86.7mm, 10.3:1 C/R, 911ST parts), and the spigot would have to be 94.1mm to run those. Many interested parties were interested at first, but not after they find out about the necessary spigot mod. This would allow people to run that set and take their case back to stock if desired (duh). Just felt like sharing!
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Scott Kinder kindersport @ gmail.com |
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Registered User
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I would be interested in seeing the data on testing. The services seem to be a promising opportunity for those who want it.
Good luck. Regards,
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Bernard |
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