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  #11  
Old 04-05-2013, 11:11 PM
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Valk Valk is offline
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Dolmar makes a true 4 cycle backpack blower with a separate oil sump.

http://www.dolmarpowerproducts.com/p...1_4/index.html

2-stroke blower? RedMax.

http://www.redmax.com/products/blowe...,586277,586273
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  #12  
Old 04-06-2013, 07:27 PM
jscozz jscozz is offline
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Picked up a 600 today! Blowing leaves has never been so much fun!

This thing is great! Thanks for all the advice and feedback! Much appreciated!
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  #13  
Old 04-06-2013, 07:32 PM
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THIESSENS TLC THIESSENS TLC is offline
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Originally Posted by jscozz View Post
Picked up a 600 today! Blowing leaves has never been so much fun!

This thing is great! Thanks for all the advice and feedback! Much appreciated!
Ya your gona love it more n more everytime ya use it! Lol.
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  #14  
Old 04-08-2013, 01:20 PM
rlitman rlitman is offline
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Quote:
Originally Posted by Valk View Post
So, since these Stihl 4-Mix run on mixed gas and the oil is being burned...why would someone smell different after using it as compared to a 2-stroke? Seems that only a 4-cycle engine that has an oil sump and runs on straight gas wouldn't smell.
The smell of gas is not from the burned oil in the fuel, but instead is from unburned gasoline. 2-cycle engines do not have valves, and by their very nature will send some unburned fuel out the exhaust port.

4-cycle engines burn their fuel much more completely because the valves maintain pressure in the cylinder until combustion is complete, and there is almost no unburned gasoline left when the valves finally open. Sure, there is smoke from the burned oil, but that doesn't smell nearly as much as the unburned fuel itself.
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  #15  
Old 04-08-2013, 01:29 PM
rlitman rlitman is offline
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edit: whoops, double post
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  #16  
Old 04-08-2013, 04:17 PM
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avguy avguy is offline
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Congrats! I love mine.
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  #17  
Old 04-09-2013, 12:15 PM
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Valk Valk is offline
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Quote:
Originally Posted by rlitman View Post
The smell of gas is not from the burned oil in the fuel, but instead is from unburned gasoline. 2-cycle engines do not have valves, and by their very nature will send some unburned fuel out the exhaust port.

4-cycle engines burn their fuel much more completely because the valves maintain pressure in the cylinder until combustion is complete, and there is almost no unburned gasoline left when the valves finally open. Sure, there is smoke from the burned oil, but that doesn't smell nearly as much as the unburned fuel itself.
Thank you for your explanation. I was not correctly thinking about this unburned fuel aspect...just focusing on the oil.
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  #18  
Old 04-09-2013, 01:04 PM
rlitman rlitman is offline
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Sure. 15 minutes of edging my property with my FC-85 2-cycle, and my wife won't let me back in the house without switching shirts because I smell like gas. Same thing when I had a BG-85, or MM-55, or any other 2-cycle equipment I had in the past.

Never had that issue with 4-mix stuff. At 50:1, there isn't much oil anyway, and the synthetic stuff doesn't seem to smoke much (and you need to use synthetic with the 4-mix machines). I can use my BR500 or KM110 for hours on end, and I'll only smell like sweat.

Now on my Seagull outboard engine that wants 10:1 mix, yeah, the oil smoke sure comes into play.
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  #19  
Old 04-10-2013, 12:09 AM
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Valk Valk is offline
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Gosh, I HATE my 2-stroke hedge-trimmer just because I STINK after using it.
Guessing Stihl makes a 4-mix version...hmmmm.
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  #20  
Old 04-10-2013, 12:42 PM
rlitman rlitman is offline
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Quote:
Originally Posted by Valk View Post
Gosh, I HATE my 2-stroke hedge-trimmer just because I STINK after using it.
Guessing Stihl makes a 4-mix version...hmmmm.
I can see it being worse with a hedge trimmer, or if you're using a string trimmer left handed.

My string trimmer's exhaust points away from me (out to the right), but with a hedge trimmer in front of you (and being used in all sorts of orientations), you're sure to catch more of the exhaust on your clothing. I know that when I use my kerosene torpedo heater, the smell gets in my hair like it is magnetically attracted to it. I remember 2-cycle machines giving me the same issue. My BG-85 especially (because I used it as a vacuum, so it was always in front of me, and exhausting towards me too).

I don't think Stihl's regular hedge trimmers are 4-mix though. My hedge trimmer is the one that fits on my Kombi, and that is 4-mix.
I'm quite happy with that. The extended trimmer lets me reach everything easily, and the blades are always out of my reach too.

Honestly, after hearing good things about their new EFI saw, I'm waiting to see if they release a 4-mix EFI replacement for the SH-86. That'll be my next machine.
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