Ever since the BN4 install, the exhaust has been a bit over whelming. It was consistently dark and soot would start building up in the exhaust pipe to the point that it wasn’t able to produce much heat at all. The person I bought the heater from (quite experienced in these units) stated clearly that the fuel pump had already been adjusted to supply the correct amount of fuel to the unit. Not wanting to take the fuel pump apart if at all necessary, I looked at the intake side of things. My install involved 3/4″ pvc tubing to route the combustion intake to the exterior of the bus. Chatting with some friends a bit, it was stated that it was probably a lack of oxygen that was causing my nasty exhaust output. So finally, I increased the size of the intake pvc tubing. It is now 1 1/4″ diameter pvc and there is one less 90 degree angle in the design.
Results were positive, but not as drastic as I thought they might be. The exhaust is much clearer now and the heater warms up faster. Both very good things. But there is still a bit of black in the exhaust and I am not sure if the heater needs more adjustment, or my expectations. I took a short clip that I’ll post to see if I can get some opinions from others about it. Other than that, the recent dip into single digits has made the BN4 a very welcome addition to the ride….even with that noisy fuel pump clicking away.
Tag Archive for 'Heating'
Original VW defrost knob | Part# 211959621A. Right now, since my rear defrost isn’t funtioning, I am using this to control our Eberspacher BN4 heater. With my lack of electrical knowledge, I had a bit of trouble getting the wires connected right on the knob. Let me lay it out here. If you look at this picture, you’ll see three terminals. The one by it’s lonesome is marked ‘K.’ This should go to the device your trying to control. The other two terminals are marked 31 adn 15 (hard to tell in the pic.) Terminal 31 should go to a ground of some sort. Easy one to route to is at the passenger headlight. Terminal 15 should be your + hookup. Right now mine is coming straight from the battery with a 3amp fuse inline, but there are other options that can be used on your fuse panel that would be easier.
The other pics are of the Vredestein Comtrac tires that I have on our ‘63 Double Cab. Want tires with the correct load rating (unlike many?) These are one of your options. Highly recommended.
