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> 917 engine pics, been looking for a 908...but its cool
r_towle
post Feb 6 2005, 08:28 PM
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what an amazing piece of mechanical enginering...

http://www.pbase.com/917carl/917_12_cyl_engine
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andys
post Feb 8 2005, 02:26 PM
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QUOTE (davep @ Feb 8 2005, 12:08 PM)
The real reason that helium was used in the frame is that helium is the smallest molecule. That means that the smallest of leaks or cracks could be detected. Helium is often used for leak detection due to the small molecule size. Why not hydrogen? Well, hydrogen molecule is H2 whereas helium is He. That is helium is a single atom, and hydrogen is two atoms and hence much larger.

It hadn't occured to me, but this would be a good way to test the chassis for weld joint integrity by sniffing for helium (by using He detection equipment, of course (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) ). That said, it would seem to me pretty tough to maintain He pressurized in a chassis for very long. I've done a lot of He leak testing on welded SS and Ti devices for hermeticity, but never anything with welded alum. Anyone have experience with it?

Andy
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Posts in this topic
r_towle   917 engine pics   Feb 6 2005, 08:28 PM
URY914   What you you think this engine is worth? $2-3...   Feb 7 2005, 07:40 AM
Brett W   Did you look at the 917 Chassis pics. Looks like ...   Feb 7 2005, 07:46 AM
URY914   Those welds look like mine! ...   Feb 7 2005, 07:51 AM
cnavarro   That engine is a thing of beauty. I just spent the...   Feb 7 2005, 09:01 AM
Quilmes   Here is a picture of the 16cyl engine that was des...   Feb 7 2005, 09:01 AM
Quilmes   One more view 917 16cyl engine.   Feb 7 2005, 09:02 AM
Jeff Bowlsby   Not only is it 16 cylinder...it looks like twin pl...   Feb 7 2005, 09:07 AM
DuckRyder   I think I'll go into autozone and ask for a di...   Feb 7 2005, 09:11 AM
bd1308   OMG....look at that dizzy. finding ign problems mu...   Feb 7 2005, 09:12 AM
Aaron Cox   MFI too!   Feb 7 2005, 10:10 AM
Mueller   at the factory museum, they have an aluminum frame...   Feb 7 2005, 10:49 AM
Travis Neff   slide valve intakes... woohoo.   Feb 7 2005, 11:03 AM
BigD9146gt   towle, let me know what you find on the 8... I...   Feb 7 2005, 01:25 PM
sixnotfour   Have you seen these 8 banger 2.2 pics ? http://w...   Feb 7 2005, 01:32 PM
Reiche   I think I read once that the flat-16s crankshaft w...   Feb 7 2005, 01:51 PM
type47   you guys SUCK! it took 5 posts before someone ...   Feb 7 2005, 02:34 PM
BigD9146gt   Helium making the chassis lighter? I don't thi...   Feb 7 2005, 04:39 PM
andys   Thinking back to the glory days of Riverside, I re...   Feb 7 2005, 05:53 PM
BigD9146gt   Sammy, now that makes sence to pressurize the tube...   Feb 8 2005, 10:31 AM
URY914   Cool picture...   Feb 8 2005, 10:36 AM
Cloudbuster   The first run chassises, chassii -- frames -- were...   Feb 8 2005, 10:52 AM
BigD9146gt   Sammy, thats some pro- picking nutting giong on he...   Feb 8 2005, 11:08 AM
Quilmes   908 engine photo from Rennsport II Daytona   Feb 8 2005, 12:28 PM
Quilmes   Here is one from a 917-30   Feb 8 2005, 12:29 PM
Cloudbuster   How much weight gets added in bungs, gauge and plu...   Feb 8 2005, 12:55 PM
andys     Feb 8 2005, 02:10 PM
andys     Feb 8 2005, 02:26 PM
Cloudbuster     Feb 8 2005, 02:39 PM
physician   the good thing about using helium is that you dont...   Feb 8 2005, 03:26 PM
BigD9146gt   I personally like how in the pictures of the 917 e...   Feb 8 2005, 04:07 PM
r_towle     Feb 8 2005, 08:21 PM


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