Sid Glad to see you getting close to your KR back in the air.
I had the same problem on my Zenith on my old KR. I solved it by drilling out the main fixed jet in the bottom of the float bowl. I just used some Acetylene torch cleaners to ream the jet out ever so slightly. That made the mixture stay more constant throughout the full throttle range, and it enriched the top end to acceptable levels. Of course I didn't have a Mixture Meter to see instantaneous readings only an EGT, but it seemed to work. There is a lot of black magic going on in an intake system. Roger Bulla rbulla at wic.net Plans Built KR2 6338Z -----Original Message----- From: smwood via KRnet Sent: Friday, May 30, 2014 10:53 AM To: krnet at list.krnet.org Subject: Re: KR> Progress My Zenith on the 2180 VW does go rich to lean from idle to WOT. Sid Wood smwood at md.metrocast.net Tri-gear KR-2 N6242 Mechanicsville, MD, USA ------------------------------------------------------------------ > Sid, does your engine go very rich at mid to low throttle settings? > Mine with the Zenith carb was good at idle and full throttle, but went > very rich to the point of fouling plugs at mid range. I didn't know > what was going on until I installed the mixture meter then I could > compensate for it. Spoke to an engineer at Zenith and he told me that > the part number for that carb was the generic one not tuned for a > particular engine and there was a jet in it that should be a little > bigger to even out the mixture across the whole throttle band. > > Brian Kraut > > -------- Original Message -------- > > > Made the first ground engine run after: the engine re-location (to > adjust > CG), installing new RevMaster oil cooler, oil pump (to control high oil > temps), moving the fuel pump (to fix vapor lock) and adjusting the > Zenith > carb. After an eight-month stand-down the 2180 VW fired off on the > fourth > blade; runs smooth and strong. After a little warm up idle can be set at > > 600 RPM, but shakes a lot. 700 RPM is much smoother. OAT was 57 F & RH > about 95%. Carb was making ice at 28 F. Carb heat works well. Cabin heat > > off the oil cooler works good. Mixture Meter works good. Have 6.9 hours > TT > on the engine. > And no leaks!!! > Need to finish the cowl, do another W & B, sign off the condition > inspection > and get on with Phase I flight testing. > > Sid Wood > _______________________________________________ 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
