Wow Jeff! ?You're making a ton of HP with that. ?Any thoughts on the effects of adding 2.5" to the crank length plus running the additional HP? ?I have only built one VW based aero engine, but I would question running that kind of HP through the VW crank while multiplying the crank loads with an extension at the same time. ?I would think the turbo boost will also degrade the life of the VW heads, which are kind of a weak area for the engine as well, but I'm sure you already know that trade off going in. ?The work looks really good and should be a blast to fly.
Are you set up with a programmable automatic waste gate, or is it set up as a manual waste gate? ?The automatic ignition timing using the manifold pressure to help with ignition timing mapping will be a big help with the boost. ?I've seen a guy blow up the a turbo Subaru trying to run a manual waste gate. ?A quick throttle response to a runway incursion while on short final and suddenly while cursing the plane that cut him off, he found himself with a closed waste gate and a serious over boosted engine and blew it up with detonation before he recognized what was happening. I like your approach to the engine and cooling. ?Cooling will be the key to longetivy of the heads. ?If you can keep the CHTs and Oil temps in the green, you should be good to go. What about compression on this engine? ?The norm for a turbo boosted engine is to lower the compression. ?With the turbo boosting, you don't really have the need for high compression at the same time as you can make up for compression with boost. ?Are you running relatively high compression pistons, or have you lowered the compression down to go with the turbo boost? Overall, good job. ?It looks great and will undoubtely be a real rocket to fly. -Jeff Scott Los Alamos, NM > ----- Original Message ----- > From: J L > Sent: 03/24/13 06:36 PM > To: krnet at list.krnet.org > Subject: KR> Turbo VW Tests > > Gents, > > Kind of indirectly related to the KR, but it shares the same power > plant in many cases. > > I bought a Revmaster turbo kit from them and adapted it to my Sonerai. > With the same prop and engine I saw 2900rpm static in the past. With > the turbo I am getting 3500rpm static on a 52x56 Cloudcars prop. > > Here are a couple of videos detailing the install. > > First runs without prop: http://www.youtube.com/watch?v=lXIix10Rzmw > > Walk around video of the install: http://www.youtube.com/watch?v=n4NKNy3z4Jg > > Test run at 45" MAP: http://www.youtube.com/watch?v=3bfpNlt3TLE > > Anyway, we will have the KR back in the air in the next week or so. > Looking forward to getting go fly it again. > > Jeff Lange > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options
