MadMax5578
ArboristSite Guru
If 4-stroke chainsaw's ever become prevalent. I'll still run my 2-strokes....because I LOVE the smell of them!! Ya....i'm nuts:greenchainsaw:
Four stroke chainsaws on the way ?
- Thread starter hiluxxulih
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Anthony_Va.
XPW Fan Club
Noise would be deafening, they really dont vibrate THAT much. They were about the same as a 2 stroke engine.
Btw a YFZ is made by Yamaha
Lol, yea LTZ is what I meant. I think anyways, I know it was a zuke 450...only rode it a few times.
Banshee was mean as heck, but could'nt keep traction in the field we we're riding them in. Waayy too much low end grunt with those wicked powerbands.
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PLMCRZY
Addicted to ArboristSite
Thats cause you dont know how to control it, thats why we have quadtards at just about every moto event.how about a cr or kx 500
i crash every 2 wheeler i ride, thats why i ride quads
pops21
Addicted to ArboristSite
Really.. So that means banshee67 is a quadtard? Come on man was it really necessary to say that. Now back to the conversation about the future of 4 stroke chainsaws.
SkippyKtm
The Lorax, my FIL rip...
Did you ever race enduros/motocross? That's why i love the smell of burning premix, especially in the morning. It brings me back to when I used to race enduros and would be waiting in my row for my minute to come up, I can still remember the butterflies!
Little Al
Addicted to ArboristSite
The pro`s & con`s of 2 stroke V 4 stroke in the above quote seems IMO to have rules favouring the 4 stroke, why not have the cubic capacity equal, ie. 125 v 125, 250 v 250, not twice or almost twice the motor size. It would make for a more ligitimate comparison if motor size was equal. Be interesting to see 800cc & 600cc 2 strokes in moto gp & gp 2. It took the 990cc gp bike a while to better the lap records of the 500cc 2 stroke gp bikes, again almost twice motor size
Fog1965
ArboristSite Lurker
Its all about the rider as well, unless its a straight line drag.
4 strokes are simply better! They could always put a 4 stroke rc airplane engine in the chainsaws as well. They rev to the moon and just because its a 4 stroke doesnt mean it needs motor oil. They would run on glow fuel...
This would look sick hanging off a stihl haha
That Saito .72 will only turn about 11,000-11,500 in the air due to valve float. A similar size Super Tigre, OS, or Rossi 2 cycle will turn around 16,000 in the air. I have over half a dozen of the hybrid R/C 4 strokes similar to that one. You still mix the oil in with the fuel (methanol and nitro for the R/C engines) just like a two stroke - except you have to use a different percentage of oil. They also don't use a 50:1 oil, more like 12%-15% Klotz KL-200. I don't think you would want to run a chainsaw on glow fuel, instead of $5 a gallon for gasoline/oil, you would be looking at over $20 a gallon for %15 glow fuel. Glow plugs are anywhere from $3.50 - $80 each these days. For a chainsaw, you would need at least 6 spares. And then you need a battery for starting, along with a spare.
A Stihl rep told me that Stihl had already made a 4 stoke chainsaw and they had no plans on producing one. They just couldn't compete with the RPM of the 2 stroke.
Fog
Although early to mid in the last decade 4 strokes mx bikes really started to take over with the addition of the electric start and smooth easy to roll on power up a snotty hill the major euro brands are still putting alot of time and effort into getting excellent 2 bangers on the competative market.
Honda made a bold move to stop making the 2 smoker about 3or 4 years ago but they are not fading away, alot of guys I know are changing back from 4 strokes as weight, extra CC for the same hp and $$$$ are all out weighed out.
In saying all that its similar to a saw, weight , cost and size are all on the 2 strokes side. The saw needs a strong band to power through and I really believe the 4 stroke will struggle, hell 6kg saw is heavy enough!
Honda made a bold move to stop making the 2 smoker about 3or 4 years ago but they are not fading away, alot of guys I know are changing back from 4 strokes as weight, extra CC for the same hp and $$$$ are all out weighed out.
In saying all that its similar to a saw, weight , cost and size are all on the 2 strokes side. The saw needs a strong band to power through and I really believe the 4 stroke will struggle, hell 6kg saw is heavy enough!
spacemule
The Peanut Gallery
And chainsaws pull 8 to 9k in wood. What's your point?
My little Honda GX31 FG100a 4 stroke Tiller has a pressure lube system using a reed valve and the piston bottom supplies the pressure, very clever. The pushrods are super light weight and forged steel rocker arms. Revs to 9,000 rpm. I like it on the tiller, but 2 stokes are my favorite, never giving them up.
Edge & Engine
ArboristSite.com Sponsor
Several saw companies have 4-stroke chainsaws, and have for years, but none in production (yet).
banshee67
Poulan Wild Thang
thats quite a clever deduction you have made sir
now lets see you throw a 400lb quad around the trails all day and tell me how easy it is, "bike tard"
riding a 2 wheeler alone does not give you bragging rights over someone who rides a quad, there are riders and there are riders, most people on dirtbikes are a hazard to themselves and the people around them, but in their minds they are cooler because they are on 2 wheels and none of us "quadtards" can handle 2 wheels.
bet you ride an xr200
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I really don't think anyone appreciates the size of that engine in the video... so here is one without the blower...
Throw that on a saw and you'll make me a happy camper. Roughly 5.5 hp w/o a blower.
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CentaurG2
Addicted to ArboristSite
Bit big for a chainsaw but it is a 2 stroke.
http://www.autoblog.com/2009/11/30/autoline-on-autoblog-with-john-mcelroy/
http://www.autoblog.com/2009/11/30/autoline-on-autoblog-with-john-mcelroy/
barton174
ArboristSite Guru
thats quite a clever deduction you have made sir
now lets see you throw a 400lb quad around the trails all day and tell me how easy it is, "bike tard"
riding a 2 wheeler alone does not give you bragging rights over someone who rides a quad, there are riders and there are riders, most people on dirtbikes are a hazard to themselves and the people around them, but in their minds they are cooler because they are on 2 wheels and none of us "quadtards" can handle 2 wheels.
bet you ride an xr200
I don't know about the guy you were replying to, but I ride a TTR-250 dirt bike... Dirt cheap, great woods bike, headlight, low maint. (air cooled), no radiators to break, electric start, etc... Is a dual sport bike in other countries, so really long oil change and valve adjustment intervals, and the 6-speed with a granny gear and a highway gear is really nice...
Anyway...
I think that came from riding at off-road parks and such. Yeah, there are some of everybody who is learning, and outrides their skill level, or just plain old messes up every once in a while. The real thing is; a quad doesn't take a base level of skill to operate like a dirt bike does, and is really easy to ride way above your skill level until it bites you and/or someone you hit, hard. Yeah, there's some of everybody at those places, but I've been almost run over more times by groups of sober and/or drunk morons on quads than people on dirt bikes. This is both when I'm on the quad, and when I'm on the bike, I consistantly almost get run over by quadtards. Not everybody that rides a quad is a "quadtard", but every quadtard is on a quad... It's the same way that not everybody on a sportbike is a squid, but almost all squids are on sportbikes (I've put 75k miles on my CBR1100XX in the last 4.5 years, so I've heard it all).
Mike
stevohut
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8-9k try more like 13,500
here's another engine concept... if it ever got off the ground, it could be used for quite a bit of small gas engine replacements
http://quasiturbine.promci.qc.ca/ETypeCombustion.htm
Here is a saw that runs on air:
http://quasiturbine.promci.qc.ca/ETypeCombustion.htm
Here is a saw that runs on air:
4-stroke is heavier and more complex by nature. Valve train vs piston porting? Fft. No 4 stroke made of currently-available materials will ever match the power-to-weight ratio of a 2-stroke, particularly under 100cc, where part size will limit durability.
tdi-rick
Addicted to ArboristSite
Mate, if you are getting 13,500 in the cut you either have a hellishly quick hotsaw that would win any comp in NA or you have no cutters on your chain
Stick a tach on a stock saw, any saw and sink it into some timber.
I'd hazard a guess that if you saw 10,000RPM you have a quick saw.
tdi-rick
Addicted to ArboristSite
True, but people still try, remember the KMS-4 Dolmar ?
There are modern equivalents too, although not quick by NA hotsaw standards, I like how this bloke in The Netherlands is thinking outside the square.
You could say a Wankel is a four stroke/two stroke, sorta kinda
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