Does anyone use a B&B smoke pump with Z80?
If so where do you put that huge vacuum tap in the crankcase?

By "Z80" I'm assuming that you mean the Zenoah GT-80? If so, I drilled & tapped mine at the base of one of the cylinder, on the 'flange' of the crankcase..... some disassembly required. I ended up using one of the B&B 90-degree smoke taps.

I did the above while awaiting a reply from Horizon on the best place to tape the engine. After I did the above I finally got a reply. They suggested putting a "T" fitting into the pressure line that drives the diaphragm pump on the carb.... case is already tapped!

I tried both ways (plugging the "new" tap when trying the "T" fitting method).... both ways did indeed work. Perhaps it was just a desire to be proven that I didn't do aa bad thing, but it seemed to me that the tap off the case worked a little better than the "T" method..... but the "T" method is a whole lot easier.

I'd suggest using the "T" method and giving it a try.... if you're happy with the performance, great. If not, you can always tap the case later.

BJH

You get the same pulse either way, and there is no problem because both are dead end functions...

Thanks for your replies.

I meant ZDZ 80. Its a problem because the rear carb prevents you from taping the back plate. Also there is no vacuum line to the carb to tap.
I had a similar problem with the G45 and wound up sending the engine to B&B to install the tap. They put it in the side of the cylinder wall.
I know people have used the B&B system with the ZDZ80. I just wonder where they put that huge tap. Its 1/4 in in dia. (od) I asked B&B if I had to use that huge tap and the answer if I wanted reliable smoke I needed to.

Any place in the case or transfer port will work, same pulse.....
1/4-28 thread, #3 drill.........

I did one ZDZ 80 for a friend of mine, another friend got one done by the guys at RC Showcase. I followed where RC Showcase did theirs - right on the 'flat-spot' of the gold ZDZ 80 'tag' on the side of the crankcase. By "flat-spot" I mean that area of the tag where there's no text.... worked great, smokes like crazy.

Again, some dis-assembly required, and be careful where the chips fall!

BJH

Thanks much for the replies. I have a drill press and a means to hold the engine but I still don't like drilling a high value part. I guess I have to if I don't want to spend more than $100 for a smoke system.