VIPER458

i was wondering if anybody knows if the v6 my mhz boats is a 2 stroke. it kinda looks like it is but there isnt much information on it.

OLD_SLOW and in the WAY

its a nitro 2 stroke

VIPER458

so how do they distribute the fuel into the cylinders? i noticed there is a belt to some part on the front so is it turning some kind of valve system?

OLD_SLOW and in the WAY

think of it as a camshaft instead of lifting valves it opens ports

VIPER458

OH. OK. I GET IT NOW. HOW ARE THEY GETTING FUEL OIL TO THE CRANKSHAFT AND WRISTPINS AND STUFF??

jacob711

they have three carby's on the top that feed the fuel/oil through

jacob711

they have three carby's on the top that feed the fuel/oil through

oops double post

VIPER458

after it goes thru the carb dosent the fuel go straight to the combustion chambers via the rotating valves? how do they get fuel/oil to the crank?

fastguy

5 second google search sound you a great answer lol[link=http://www.keveney.com/twostroke.html] 2 stroke[/link]

Flabum

Most two stroke engines (except full size diesel engines like a Detroit 6-52) have the fuel drawn into the crankcase on the upstroke, allowing the oil to coat the internal parts. Then on the downstroke, the fuel is forced into the combustion chamber through the intake ports and is then compressed and ignited on the next upstroke.

OLD_SLOW and in the WAY

like this here only times 6

VIPER458

but wont all the pistons equalize the pressure? while the one is going up the other is going down so isnt there the same amount of pressure? i could understand if there was a supercharger or something on it but there dosent seem to be one on that engine.

glennb2006

If it was crankcase induction you would be correct, there would be no scavenging from the crankcase and therefore no fuel / air getting to the top side of the pistons.

This motor appears to have inlet straight into the cylinder, controlled by the rotary valve, and piston ported exhaust as usual. Looks nice mind.

Glenn

VIPER458

if they are using a rotary valve how are they getting fuel into the cylinders? there is no supercharger or anything that i can see that will force fuel into them.

glennb2006

As the piston travels down the bore it creates negative pressure, the valve will be timed to open during this down stroke. Piston porting with a rotary valve too!!

I am assuming this motor must also have some lubrication provision for the bottom end, wet sump. Not sure. Maybe you can ask MHZ if they have a manual for it or some tech documents you can look at?

Glenn

VIPER458

wouldnt there be no negative pressure bc the cylinder is firing? to me it seems there will be a little positive pressure bc its a 2 stroke. i could see how it would work w a 4 stroke but the 2 stroke has a power stroke every time. but i think i will contact mhz. im not to sure how willing they will be to send me information on it though bc there arent very many engines i know of like that. but ill give it a try.