928 Block Thoughts
#76
Road Warrior
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most of it already is (on a public road), unfortunately. guess that's why I got into off road racing years ago. kinda like the last frontier of hot rodding, since even our lakes and rivers now have speed limits...
#77
Former Sponsor
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Sorry all. I've been terribly busy. I'm working on getting some pictures that will show the cracks. Mike's drawing with the red line is exactly where they crack. This crack moves all the way up into the cylinders. It will go so far up that combustion will actually pressurize the oil system. The cracks spread to the next cylinder and that cylinder cracks downward. So much for worrying about the thin 104mm bores! the cracks don't travel up the cylinders to the tops! They actually stop where the lower part of the block meets the water jackets. Some water does get into the cracks and probably into the oiling system.
Give me a couple of days to get pictures that are worth the time.
greg brown
Give me a couple of days to get pictures that are worth the time.
greg brown
#78
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Mike S. wrote:
It will be good to see the actual pics when Greg posts them, but based upon your analysis and Gregs confirmation of where the cracks occur, doesn't appear that the alusil material of the block has met its stress limit? What I'm wondering is how would stronger studs, additional pinning, etc, help in this situation where it appears that perhaps the alusil had met its stress limit.
Brendan, I too thought about larger studs but the strength of the threads in the block might be a concern
#79
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I first saw the darton sleeves on Mr. Boyer's car back in 2004. No updates from me - anyone in the PacNW?
http://www.aswest.net/images/Bob-Ale...elzers-car.jpg
http://www.aswest.net/images/Bob-Ale...elzers-car.jpg
#80
Race Car
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Originally Posted by DK
I first saw the darton sleeves on Mr. Boyer's car back in 2004.
http://www.aswest.net/images/Bob-Ale...elzers-car.jpg
http://www.aswest.net/images/Bob-Ale...elzers-car.jpg
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#81
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Originally Posted by GregBBRD
I've noticed that some people, who are building engines, are cutting out the existing cylinders and installing free standing cylinders. I just wondered if anyone seriously thought that this was going to work?
https://rennlist.com/forums/944-turbo-and-turbo-s-forum/335676-my-project.html
#82
928 Collector
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Originally Posted by SwayBar
What a great picture; that car looks so muscular and ominous! ![Cheers](https://rennlist.com/forums/images/smilies/beerchug.gif)
![Cheers](https://rennlist.com/forums/images/smilies/beerchug.gif)
#83
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I understand 75% of what is being said and can imagine forces descibed, but when it comes down to it, I am so out of my element in this part of 928 ownership is not even funny. Truly a humbling thread, though it seems out of place these days on the Rennlist.
I am thankful that interest is brought to light over these engines, to delve deeper than over just how it works.