Stihl MS500i

MustangMike · Sep 20, 2017

A little heavier than the 462, but a pound lighter than the 461, and close to 661 power ... Not bad!!!

And I like the look of that filter cover! We won't need to add frog skins!!!

paragonbuilder · Sep 20, 2017

I wonder how reeds would do with the fuel injected directly into the crank case? Seems you could get a lot of primary compression and the size of the intake would be limited much less than needing a Venturi for the carb.
Even piston ported I think you could get much more air in than with a carb blocking flow...

tree monkey · Sep 20, 2017

I inject in the gas tank

no carb

wcorey · Sep 20, 2017

paragonbuilder said:
I wonder how reeds would do with the fuel injected directly into the crank case? Seems you could get a lot of primary compression and the size of the intake would be limited much less than needing a Venturi for the carb.
Even piston ported I think you could get much more air in than with a carb blocking flow...

Reeds tend to have rpm limitations...

wcorey · Sep 21, 2017

RI Chevy said:
They must have lots of computer information and sensors to control the timing and length of the injection.
I wonder if it will like 40:1 more. Lol

I'm a little out of date on the newer fuel injection systems but it used to be either closed loop or open loop.
Bikes were typically open loop, cars mostly closed loop.
Both use an rpm sensor and a throttle position sensor (among other less urgent things like air temp and pressure) but the more complex closed loop also needs a mass (air) flow sensor and air/fuel ratio sensor(s).

With open loop there is a pre programed 'map' that has to make a lot of assumptions about what's going on with the motor. if something is changed, like opening up the exhaust, the system has no way of knowing that, so won't compensate. The map (program) needs to be manually changed, much like re jetting a carb.

With closed loop the map is dynamic and gets enough input info so automatically adjusts (to a degree) to any changes in real time.

I've only recently acquired autotune saws so never paid much attention to how it works to adjust with such limited info as it must get. Seems it doesn't change in real time though, takes a bit to learn new conditions.

Will be interesting to see how/if this new fuel system will respond to modding/porting changes and if it will have the extra capacity to keep up.

RI Chevy · Sep 21, 2017

Sure will Bill. [emoji106]

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MustangMike · Sep 21, 2017

Good info Bill. On a different note, the 462 will be the first "Ver II" M Tronic, and I'm hoping it responds to changes better than Ver I. But I'm not sure what the changes were made.

wcorey · Sep 21, 2017

MustangMike said:
Good info Bill. On a different note, the 462 will be the first "Ver II" M Tronic, and I'm hoping it responds to changes better than Ver I. But I'm not sure what the changes were made.

If it's anything like what improvements are being claimed for the 572xp, it will respond much faster to changes.

Locust Cutter · Sep 21, 2017

Subbed.

jake wells · Sep 21, 2017

i would call it indirect injection.

jb-chainsaws · Sep 21, 2017

My question would also be how well the injection system copes with mods, and indeed whether the injectors will even be capable of providing more fuel if required. It could be the end of porting until there's a viable alternative set of injectors you can swap in to pump more blue stuff into the case

CR888 · Sep 21, 2017

I wonder what will happen to the MS880 when its upgraded.... will it be an MT MS881 with springs and design changes like the 661 or will it be the MS882i with FI and groovy cutouts in the filter housing. Its a good time in the world of saws, much to look forward to. Husky has missed the boat with the 572xp, it would have succeed in a world where 441's & 461's were its competition but going up against the 462 & 500i is big trouble for them. They twiddled their fingers too long on that saw, it should have gone to market 4 years ago. That said I'm kinda interested in it with a full circle crank and reliability upgrades. Lately I feel all my saws are old & out dated. A few months ago they were all current models.

jb-chainsaws · Sep 21, 2017

CR888 said:
I wonder what will happen to the MS880 when its upgraded.... will it be an MT MS881 with springs and design changes like the 661 or will it be the MS882i with FI and groovy cutouts in the filter housing. Its a good time in the world of saws, much to look forward to. Husky has missed the boat with the 572xp, it would have succeed in a world where 441's & 461's were its competition but going up against the 462 & 500i is big trouble for them. They twiddled their fingers too long on that saw, it should have gone to market 4 years ago. That said I'm kinda interested in it with a full circle crank and reliability upgrades. Lately I feel all my saws are old & out dated. A few months ago they were all current models.

The best saws are all over 15 years old anyway

CR888 · Sep 21, 2017

Fuel injection can take place in a variety of locations, its all still fuel injection.

CR888 · Sep 21, 2017

jb-chainsaws said:
The best saws are all over 15 years old anyway

Yes...but...yes, very true.

Dub11 · Sep 21, 2017

jb-chainsaws said:
My question would also be how well the injection system copes with mods, and indeed whether the injectors will even be capable of providing more fuel if required. It could be the end of porting until there's a viable alternative set of injectors you can swap in to pump more blue stuff into the case

I think it should. After hearing stories of A/T and M tronic correcting air leaks it should be able to feed some mods. I still want to know where the fuel pump will be and what the tiny high pressure lines will look like.

astnmacgto · Sep 21, 2017

Dub11 said:
I think it should. After hearing stories of A/T and M tronic correcting air leaks it should be able to feed some mods. I still want to know where the fuel pump will be and what the tiny high pressure lines will look like.

Behind the flywheel?

Dub11 · Sep 21, 2017

astnmacgto said:
Behind the flywheel?

I don't know

Does any one have an IPL for the 500i?

Fruecrue · Sep 21, 2017

I wonder if the injection unit / fuel pump will sit where the carb does. No high pressure line from the tank or pump in the tank (we all know how fun that is).
Gas /oil mix would have to be injected into the case at a point with lots of air flow and turbulence to remain atomized, what better place would there be? Transfer tunnels would be too late to lube the bottom end.

How is it done on the fuel injected cut-off saw I've heard mentioned?

Jimmy in NC · Sep 21, 2017

I have rebuilt a TS500i. Easier to work on than a MS441C. The system is simple. What most will laugh at is the primer bulb which is actually a fuel pump. Very very good system. The trick will be dealer support as they get to high hour. When that saw was running right it spanked a TS420 hard.

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Stihl MS500i

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