Finally a new saw that sounds like a 288 XP
It has a few common parts from the 390xp. Clutch, drum, and recoil. Not sure if the oil pump is a direct swap I didn’t get that far. Big end of the rod looked a little beefier.
the air filter let a few fines by in the tank of fuel we put through it. It may need a light film of grease around the lip. Ala HD2. Saw performed very well. This is a hot start saw. It does get heat soaked after several minutes. Fast idle start IS necessary. That’s about all I got.
Be cool to test those theories on the dyno. Eliminate the variables.I could be wrong, but in theory stuffers should always be better right? Port timing can be adjusted to provide the power curve you want.
It’s too thin for summer use. No tackyness so it flings right off the bar tip. Long term, you will see more wear vs conventional bar oil made for chainsaws. Does it work? I’m sure it does. But I won’t be using it in my saws.
Nobody’s disappointed it’s a strato? And dual port? I kind of am. Is being strato part of why there are ridges in the transfer uppers?
It ain’t no 395, that’s for sure. More like a Autotune 390.
@redlight066 , any muffler pics? Really appreciate your posts. Very interesting.
I think those ridges in the uppers help direct the flow, maybe adding some sort of spin or vortex to the air to steer or swirl it how they want. It could even counter the effects of flowing through the tunnels and straighten out the flow.
Could be another good thing to dyno test friction loss from lighter vs thinner oil. Eliminate the variables.Been using it for 12 years. But it is much cooler here in Ireland and the UK(70*F is considered a warm day and 80F is oppressive according to the locals).
No bad effects. No bars dying early. Bear in mind I think they are required to use rapeseed in Germany and Austria now.
I do notice it flows faster than typical bar oil, and isn't as tacky. It goes nearly as fast as the fuel in most my saws.
5 ltr of bar oil here is usually 12€(unbranded)up to 20€(Stihl). 5 ltr of rapeseed is as little as €2.50. So you can buy bars all day long if you needed to if it oiled like it was water with those savings. I do most of my work on a large estate near a lake and a large river that is also certified organic. So we try our best to keep the chemicals off the property and out of the water.
Could be another good thing to dyno test friction loss from lighter vs thinner oil. Eliminate the variables.
Remember these dual ports have their tunnels in a different direction than the old dual and quad port cylinders. It may make more power because of that.
881 Is the biggest strato.
Interesting that the detuned 585 is standard manual carb. So it might be easy to swap some parts and have a standard carb 592xp should you really want it.I dunno, in a big saw with that fat ass strato piston bouncing around, and modern day electronic witchcraft, I imagine it has all the low end grunt you need for most work. It looked to cut as fast as my stock 288 did in that video. I'm OK with it being strato. I would rather strato than AT to be honest.
Well it was all the rage many decades ago when engineers discovered large gains in reducing case volume. HP went up, RPM too, they went a bit mad with this single minded theory which led to a 3cylinder 50cc 2T bike putting out some ridiculous amount of HP like 30, reved out to 20k RPM. Only problem was it needed about 15 gears to ride and had a wafer thin power band. Basically nobody could ride it. Can you increase power by reducing case volume....sure. Is it the only way or best way to do it, not necessarily.I could be wrong, but in theory stuffers should always be better right? Port timing can be adjusted to provide the power curve you want.