Dolmar

[Caleb]

The battery saws themselves are fine its the batteries that are holding them back at the moment.

[Eddy_t]

The future? No! How many 4-strokes run on their sides

[peatff]

The future? No! How many 4-strokes run on their sides

 

Dry sump system will run any way up. Aeroplanes fly upside down, adapt one of their engines

[bobh]

Dry sump system will run any way up. Aeroplanes fly upside down, adapt one of their engines

 

Do you mean a jet engine! Now that's a great idea, but I might let someone else try it first😁

[aesmith]

Dry sump system will run any way up. Aeroplanes fly upside down, adapt one of their engines

Do you mean a jet engine! Now that's a great idea, but I might let someone else try it first😁

Inverted or negative G operation is about the fuel system as well as lubrication. How about a drone engine, if 38HP is enough for you?

 

AR741 - 38 BHP

[shavey]

the mm-4 engine is designed for 360 degree use it uses 80ml of engine oil and its fed around the engine via a patented makita dolmar system blown around by air with a non return check ball that stops the oil draining down from the upper engine when the machine is'nt in use

 

they are quieter less emmisions and coupled with aspen very green but heavier is the another downside

[bobh]

How would the torque compare to an equivalent cc 2 stroke?

[shavey]

How would the torque compare to an equivalent cc 2 stroke?

 

that i dont know off hand about the torque but i know the max power rating is less

 

dolmar PS-7910 chainsaw 78.5cc 4.3kw - 5.9 ps

 

dolmar PC-7614 power cutter 75.6cc 3.0kw - 4.1ps

[SawTroll]

does anybody know anything about this chainsaw ?? it was a prototype 4-stroke chainsaw developed several years ago but never put into production please correect me if iam wrong

 

is it the future ? :thumbup:

 

No, it weighted like a 70cc saw, a was a relatively weak 50cc saw - it is an ill concieved relic of the past, definately not the future!

 

It happened around 10 years ago, if my memory serves.

[shavey]

No, it weighted like a 70cc saw, a was a relatively weak 50cc saw - it is an ill concieved relic of the past, definately not the future!

 

It happened around 10 years ago, if my memory serves.

 

have you got any torque figures for this engine

 

but they surely would'nt waste that design, surely it was the stepping stone for these mm-4 engines there using now :thumbup: