Hi Mark, I had high temps on my Revmaster -didn't know what all-so I fitted an adjustable outlet flap to the lower cowling, I fitted a new spring to the pressure relief valve (don't ask -a VW specialist advised me). Fitted a VW oil cooler to the top side.
Had an ex RAF test pilot to do the checks and he complained that the engine ran too cool ! I checked with Ken Moult and he said "What's he complaining about"! The test pilot had lost confidence in my engine -so I sacked him... Highlight of my career -an ex Vulcan chiefy sacking an RAF Group Captain (retired) Your results may differ ! All the best to you and your family, Mac On Tue, Jul 19, 2016 at 2:15 PM, Mark Langford via KRnet < krnet at list.krnet.org> wrote: > Roger Bulla wrote: > > > Has anyone tried these heads from CB Performance? They look like they > have better air flow around the exhaust ports and maybe better quality > control?< > > Looks like maybe they have swapped to the "Chinese castings", which are > improved over the CB 044 heads that came on N891JF. These are > essentially what I bought from DRD Racing. I've done a lot of photos of > these and several other choices over the last few weeks, having replaced > my heads a week or so ago. See http://www.n56ml.com/n891jf/vw/ for more > on this. It's a comparison of several different heads and their air > passages. I was happy with the quality of the DRD heads, which looked > very similar to the ones in your link. I've put two hours on them so > far, and the thing still runs hot, so I'm on a baffling witch hunt now. > I need some "conformal" fiberglass plenums on that thing like I have on > the Corvair. > > I'm still looking for ideas on "what works" in various VW aircraft > installations, because what I have isn't working. I took off in 95 > degree temp yesterday, and after idling to the runway and a quick runup, > it was at 400F as I turned crosswind, and I wasn't even at pattern > altitude yet! Baffling is pretty tight on this thing, but what I don't > know is what's going on in flight between the top of the cowling and the > fiberglass/silicone seal. That's my main mission for the next three > days until I take off for OSH. One more thing I'm going to do is wrap > those hot exhaust pipes (just inside the inlet) with insulating wrap. > No sense in preheating my inlet air... > > Mark Langford, Harvest, AL > ML "at" N56ML.com > www.N56ML.com > > > _______________________________________________ > 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 >
