hey guys i have just recently got a water cooled blata rep motor for a school project as was just wondering if i will have to mount a petrol tank above the carby or does it have a fuel pump or will it be able to pump up the fuel some how.
cheers guys.
joey.
also guys i no this is probably on here. but is there any thing better about an sq motor and how can u tell if it is one. i might be wrong but is it a s stamp on the barrol.
if you really want to know, go to the thread started by sharp_lines, he asked the same question and look at the pics i posted of the cranks. look at the crank in your engine and see which one it is
__________________ -SQ blata rep (47cc big bore kit, 19mm dellorto PHVB, Blata reeds, Blata crank, Zocchi Rep Pipe, 7mm reed spacer) -911 rep (BZM 50cc 6 port top end, bzm bottom end, bzm 40cc pipe, BZM red crank, bzm gold head, BZM 18mm carb) -D1 (50cc 5 port polini rep engine, 19mm del rep carb, bzm 50cc rep pipe)
as far as i know, all pocket bikes are gravity fed...if your planning on mounting the tank lower than the carby, then you may need a fuel pump, but be aware that these bikes dont use a pressurised fuel system, so there could be some issues with using a pump
Pocket bikes in general use a gravity feed fuel delivery system for the carburetor. Therefore if you mount the fuel tank below the carburetor you will get no fuel flow.
BUT.
Walbro carburetor's have an internal fuel pump that uses the crankcase pressure and vacuum to power the pump within the carburetor. The best thing you can do is get a Walbro carb off a chainsaw that uses an external pulse line. Fabricate a flange to bolt the carby that will press into the stock manifold then drill and tap a hole into the crankcase for a small hose nipple to screw into that you plug the pulse line into. This drives the fuel pump and everything works hunky dory and best of all it's easy to tune and make setting up a throttle linkage very easy for use with an RC servo.
The short.
When a Walbro carb is primed it is able to pump fuel from the tank and the engine will operate no matter which angle the carburetor or engine is sitting. The fuel tank can be above or below the carb it doesn't matter.
__________________ Banshee SHO - WHEELIES ARE FUN
"It is better to say nothing and be thought a fool than to open ones mouth and remove all doubt."
thanks heaps crash dummy. that was spot on. cheers. you give the best advise and its always spot on.
i may just mount a tank above the carby but ill see what happens.
just one other thing. how would the walbro carby effect the perfomance of a Blata rep motor.
hey quincy i have a cag motor ive converted for a robot wars thing that runs a 16mm walbro with a servo powered throttle. it works great and has a whipper snipper fuel bottle mounted well below the carb
keep us informed, will be fun with a watercooled in it! i always wanted to put one in an rc boat
looks good glen.
how does it go pumping the fuel. are u running a pulse line or any thing. or just a straight bolt on walbro.
cheers. yeh ill do my best to keep all u guys informed. it will probley be over a peroid of 10 week as it is a school project. i have made a thread in the genral discussion if any one wants to have look.
i want to chuck a modded blata rep engine in a 5ft long racing hull, as i can get the hull for cheap, but im now thinking of designing and building my own. either that or getting a smaller boat that runs on dual nitro engines or an rc plane engine. with the right hull that would literally fly.
beans mounted a 21mm walbro on his bzm blata engine, ask him about them.
cheers
__________________ -SQ blata rep (47cc big bore kit, 19mm dellorto PHVB, Blata reeds, Blata crank, Zocchi Rep Pipe, 7mm reed spacer) -911 rep (BZM 50cc 6 port top end, bzm bottom end, bzm 40cc pipe, BZM red crank, bzm gold head, BZM 18mm carb) -D1 (50cc 5 port polini rep engine, 19mm del rep carb, bzm 50cc rep pipe)
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