---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Sun 09/26/04: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:44 AM - Re: Roller cam for Lycomings (FLYaDIVE@AOL.COM) 2. 10:13 PM - Preferred Filler? (Steven Jackson) ________________________________ Message 1 _____________________________________ Time: 11:44:59 AM PST US From: FLYaDIVE@AOL.COM Subject: Re: TeamGrumman-List: Roller cam for Lycomings --> TeamGrumman-List message posted by: FLYaDIVE@aol.com In a message dated 9/22/04 12:55:11 AM Eastern Daylight Time, TeamGrumman@AOL.COM writes: > I went to the Reno Air Races this last weekend. At the Lycoming tent, they > had a mock-up of a roller cam for the O360. The really sweet thing about > Lycoming making it avialable (they can machine your engine case to fit the > new > lifters) is that a roller cam can be made to put out all sorts of horsepower > or > torque at any rpm or for any range you want. =============================== Team: A couple of questions: 1 - Our original Cam and Crank use split babits instead of roller bearings. If we were to go to roller bearings how are they assembled into the Split Case and Over the lobed of the Cam? 2 - Roller bearings are nice but they are not the entire story. What about Cam Followers and Roller Rockers? From reading this thread there is much more to Roller Cams that what is being mentioned. Well, it is being mentioned but it is being glassed over. The use of roller Cams, Cam Followers (which have not be mentioned) and Roller Rockers (also have not been mentioned) all go to reducing running friction. A reduction in this friction will offer up some more HP and longer life. BUT! The large increases in HP as mentioned are from changes in Cam Timing. As mentioned you can request improved performance at different ranges: Low End, Mid Range and High End. This usual increase is usually followed by an increase in Gas Usage and in Heat. Looking from the other side of the equation changes in cam timing can also be done for fuel economy. I would love to see a reduction in friction and a reduction in gas usage. Say a cruse at 8000' and burning only 5.5 GPH. I just did a flight from Atlantic City, NJ to Charlotte, NC and burned 7.6 GPH in a O-360. Just imagine what that could have been with lower friction and a better cam. Barry "Chop'd Liver" ________________________________ Message 2 _____________________________________ Time: 10:13:50 PM PST US From: "Steven Jackson" Subject: TeamGrumman-List: Preferred Filler? --> TeamGrumman-List message posted by: "Steven Jackson" TG, What's the preferred filler for small dents and dings? Steven Jackson N1434R L22 Yucca Valley, CA