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-   -   dubb jet 56 (https://www.rcuniverse.com/forum/extreme-speed-prop-planes-104/11687777-dubb-jet-56-a.html)

SACKRC 02-14-2021 05:54 PM

dubb jet 56
Aquired a jet 56. noticed that the piston when at bottom of stroke is not even to bottom of the sleeve it at least 1/8 to 3/16 above it leaving the exhaust port looking closed off
anyone experience this??? appreciate help rich barile thanks

Rudeboy 03-27-2021 06:05 PM

Let me get this straight:

If the piston is all the way down, about 1/8" of the exhaust port is still covered by the piston?

scoeroo 03-28-2021 08:21 AM

I'd be happy to check it out for you if you would like to send it my way - PM me
I have been running Dub JETT motors in my Q500 planes (per avatar) for near on 20 yrs

GREG DOE 03-28-2021 02:43 PM

Sounds like the sleeve is rotated 180 degrees?

Pylonracr 03-31-2021 02:08 PM

Is the engine new? I just pulled the header off of one of my many small block Jett engines, and the piston sits quite a bit below the bottom of the exhaust port at BDC. If your piston is up too high in the port something is seriously wrong. How about posting a couple of pictures.


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