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interesting data mark as you say cyl 6 is cool but you will fix that i am sure oil temps look high 237- this could be a problem p ----- Original Message ----- From: "Mark Langford" <n5...@hiwaay.net> To: "KRnet" <kr...@mylist.net> Sent: Friday, November 18, 2005 1:17 PM Subject: Re: KR> MARKS CORVAIR ENGINE > Larry H. wrote: > > > I was wondering how the Corvair engine is going and if you are happy with > > it. Are you still thinking about going back with the larger engine or are > > you satisfied with this one. > > I'm still going to build another larger 3100cc engine, but I'll put a > shorter extension on it, since the longer one isn't necessary to work with > my cowling. I'm very satisfiied with this engine/prop combination. It > pulls just as good as the old one did, and is noticeably smoother, despite > the fact that the first one was perfectly balanced, and this one was just > "thrown together", paying attention only to cc'ing the chambers, rather than > overall balance (well, I did buy matched rods and pistons, but didn't have > the whole engine dynamically balanced like I did the last one). This engine > has higher compression than the old one, which is partly responsible for the > good power, but only about a third of it. I attribute the rest to a more > efficient prop. I can turn this engine the same speed as the old one, and > go about the same airspeed. > > > Did you ever find out why the crank broke in the first one. I was always > > under the impression that the Corvair crank was it's best asset. > > John Kearney's engine vibration tester showed that prop forces were the > largest contributor to overall engine vibration. This in itself isn't a > smoking gun, but it tells me that the prop is a very important factor in > what the crank sees. Given no other smoking guns on my crankshaft, I now > believe that the handmade prop that was on my engine was the source of a > vibration that was amplified by the longer prop hub and eventually broke the > crank. The new 54 x 54 Sensenich was CNC'd to perfection, and is very > smooth. I feel a lot more confident behind this one. > > I've started work on a Corvair College #9 page, which shows some engine > parameters from the flight. See > http://home.hiwaay.net/~langford/flights/cc9/ . I'll be adding to it > later...this is just a start on it... > > Mark Langford, Huntsville, Alabama > see KR2S project N56ML at http://home.hiwaay.net/~langford > email to N56ML "at" hiwaay.net > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.362 / Virus Database: 267.13.3/173 - Release Date: 16/11/2005 > > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.13.3/173 - Release Date: 16/11/2005
