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917 engine animation
Thought this was pretty cool to stare at for a while, especially at full screen... if it's a repost, sorry.
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'79 930/934 replica 80 RSR-look(Now in Sicily) 914/6 2.7 (Projekt 908/3) 1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW D-Zug Produkte/D-Zug.com |
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12-10-2009, 12:48 PM
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pretty cool
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12-10-2009, 01:11 PM
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very nice!
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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12-10-2009, 01:29 PM
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Awesome video, but what supports that big gear?
Also, what did they call the shaft drive that turned the distributor etc.?
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David 1972 911T/S MFI Survivor |
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12-10-2009, 04:55 PM
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Alii&Maui
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That's a keeper!
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1982 SC Coupe SCWDP#0087 KCSSL#0082 |
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12-10-2009, 06:35 PM
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That's cool!
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1970 Porsche 914 1.7L, 1982 Porsche 911 SC Targa, 1977 Porsche 924, 1979 Porsche 924, 1999 Ducati 900SS |
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12-10-2009, 06:39 PM
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i think the cams need to be checked, the timing looks to be off about 5 degrees.
pretty cool. that would make a great screen saver. anyone know how to do that? i would never touch my computer.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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12-11-2009, 03:57 AM
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Quote:
The cool thing about this CAD animation, is that the guy that did it states he used simple pix from books, some photos and a couple of diagrams, similar to the guy that built the minature working Ferrari 512. I am always amazed at this integration of technical and artistic expertise.
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'79 930/934 replica 80 RSR-look(Now in Sicily) 914/6 2.7 (Projekt 908/3) 1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW D-Zug Produkte/D-Zug.com |
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12-11-2009, 05:36 AM
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Quantum Mechanic
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the big gear you see is the intermediate cam drive gear - both upper (intake) and lower (exhaust) cams are driven off that gear.
what's not so obvious in the video is that power is taken from the crankshaft at the middle - not the end. Like the 911, the 917 (type 912) engine has an intermediate shaft, however the 917's intermediate shaft takes power from the crankshaft from a bevel gear in the center, and then turns the flywheel at the back of the case. really neat, thanks for posting.
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Mark Petry Bainbridge Island, WA 81 SC |
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12-11-2009, 07:21 AM
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Sorry for the mundane questions but...
It's clear the large gear is driven by a gear on the crank. What is not clear to me is where the shaft would run that supports that large gear. It looks like it would interfere with the piston rods.
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David 1972 911T/S MFI Survivor |
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12-11-2009, 09:37 AM
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Quote:
Nice ! Juicersr > it is a 312PB, i met him, i have pics of the (amazing) model  He met the guys who built the car in italy too ... |
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12-11-2009, 11:59 AM
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Quantum Mechanic
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The shaft supporting that gear does not run the full length of the engine. it's on a "tower" that goes between the case and the rocker boxes, between the two center cylinders. I'll see if I can find a pic for you. there's also some great pictures in "Excellence was expected" volume 2 that clarify things.
 Here we go. See that gray "dot" of sealant? Thats the end of the stub shaft supporting that big gear, which turns the two cam drive pinons.  Pretty neat, huh ?
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Mark Petry Bainbridge Island, WA 81 SC Last edited by mpetry; 12-11-2009 at 12:47 PM.. |
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12-11-2009, 12:37 PM
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Here is the 4.5 liter 917 crank with drop shaft. The gear on the left end of the drop shaft runs the oil pump. The splines on the right are for the flywheel.
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Aaron.  F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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12-11-2009, 01:38 PM
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Quantum Mechanic
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The lower shaft is titanium and I believe that the crank was forged in 2 pieces and electron beam welded together with the gear in the center.
Those parts used to be worth their weight in gold. I'd have to check if that is still true at $1200/oz.
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Mark Petry Bainbridge Island, WA 81 SC Last edited by mpetry; 12-11-2009 at 02:06 PM.. |
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12-11-2009, 01:44 PM
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That is so awesome!
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David 1972 911T/S MFI Survivor |
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12-11-2009, 02:02 PM
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Does anyone here know how cam timing was set? Also, were solid tappets vs rocker arms used?
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'79 930/934 replica 80 RSR-look(Now in Sicily) 914/6 2.7 (Projekt 908/3) 1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW D-Zug Produkte/D-Zug.com |
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12-11-2009, 05:21 PM
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Burn the fire.
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I saw some pictures in a thread earlier... Looks like they used tappets.
Quote:
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12-11-2009, 07:12 PM
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Quote:
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12-11-2009, 07:18 PM
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Quantum Mechanic
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Ferrari Pete is correct, there were no rocker arms per se, instead, tappets that bear directly on the cams. The twin cam engines in the 962 and 959 have a similar valve gear arrangement.
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Mark Petry Bainbridge Island, WA 81 SC |
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12-12-2009, 03:23 PM
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Eye of the Toiger
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awesome, my fav porsche motor
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12-12-2009, 10:23 PM
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