Porsche 917 engine rebuild - motor porn
Started by
Cheater
, Mar 11 2019 02:25 PM
6 replies to this topic
#1
Cheater
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Posted 11 March 2019 - 02:25 PM
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Gregory Wells
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#2
Dave Crevie
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Posted 11 March 2019 - 03:45 PM
Great video, but they went through it too fast. I watched it three times, and still missed the parts I really wanted to see.
Still, I think it is less "exciting" than watching Roy Payment do the flat twelve from a Ferrari BBLM. I do know that John Bolander wasn't thrilled that the distributors on a 917K were at opposite ends of the block. The front one was a little less accessible than he would have liked.
We had to get it started so it could be driven to its new home in Libertyville.
#3
C. J. Bupgoo
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Posted 11 March 2019 - 05:52 PM
Michael G. Sutlick
"A man can never possess too many small, electric motors."
Buford T. Tesla, (c. 1927)
"A man can never possess too many small, electric motors."
Buford T. Tesla, (c. 1927)
#4
NSwanberg
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Posted 12 March 2019 - 03:03 AM
All that HP from an air cooled engine always amazed me.
How much down force did the cooling fan contribute if any?
From Wikipedia:
In 1971 Jo Siffert raced an open-top 917PA Spyder (normally aspirated) in the 1971 Can-Am series.There is also the "Pink Pig" aerodynamic research version (917/20), and the turbocharged 917/10 and 917/30 Can-Am Spyders. Porsche 917s also raced in the European Interseries in various configurations. In the 1973 Can-Am series, the turbocharged version Porsche 917/30 developed 1,100 BHP (820 kW).
Remember the Steube bar! (ask Raisin)
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Nelson Swanberg 5618
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#5
Dave Crevie
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Posted 12 March 2019 - 01:45 PM
The cooling fan contributes no downforce since it blows downward, not up. Bobby Rahal has a 917/10, and I have had a chance
to look it over pretty well. The welded magnesium tube frame is amazing.
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#6
NSwanberg
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Posted 13 March 2019 - 06:48 AM
Where does the cooling vent?
Remember the Steube bar! (ask Raisin)
SUPPORT YOUR LOCAL RACEWAY!!
"The denial of denial is the first sign of denial." Hank, from Corner Gas
"Death before disco!" Wanda from Corner Gas
Nelson Swanberg 5618
Peace be with all of us and good racing for the rest of us.
Have controller. Will travel. Slot Car Heaven
#7
Dave Crevie
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Posted 13 March 2019 - 11:50 AM
The fan forces air downward into a shroud which directs the air over the cylinders and heads and out the bottom.
Just as an interesting aside, Porsche also designed and developed a flat sixteen, but never raced it. It also used the same cylinder
barrels and heads from the 908 that the twelve used.
