Chris J.
Addicted to ArboristSite
If Randy had $5.00 for each time a similar comment was posted in his I-Ported-This threads.........................
BTW I'm guilty.
Mastermind Ported Dolmar 6100
- Thread starter El Moobs
- Start date
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If Randy had $5.00 for each time a similar comment was posted in his I-Ported-This threads.........................
BTW I'm guilty.
El Moobs
Are we there yet?
I guess you gave up Husky and went with Gransfors Burks
bryanr2
Addicted to ArboristSite
I did amass a nice little collection of European Axes.
bryanr2
Addicted to ArboristSite
Ive had 7 of them. 6 ported. I prefer the ported 357xp.
El Moobs
Are we there yet?
Ive had 7 of them. 6 ported. I prefer the ported 357xp.
That's what Don said all along.....
sunfish
Fish Head
I knows what I like and don't drink the kool-aid
You would never know if it 4-strokes if it does so above the rev limiter, which it likely is.
El Moobs
Are we there yet?
I'm tweaking the carb now......
Looks like it might suffer from the same issue the EL42 has. Not enough flow thru the main nozzle.
Hopefully the fix is as simple.
El Moobs
Are we there yet?
The needle and seat passage.....
Oh.........that 241 that you helped me with. WOW. You were right...
I'll stick with the saws I have listed they still ware me out and will cut anything I have came across, but now if the 6100 or the husky 357 will cut ,split and stack and move limbs I need oneIve had 7 of them. 6 ported. I prefer the ported 357xp.
Chris-PA
Where the Wild Things Are
4-stroking is just the carb producing a rich mixture with increasing rpm (air velocity). That is close to a squared function so it gets much richer with only a small increase in rpm. The rev limit is almost 2krpm higher than the running rpm, so if it isn't 4-stroking before the rev limit it's either because the mixture is set very lean or because something is counteracting the squared fuel mixture curve. That would be the effect I described where the fuel mixture through the case does not entirely get into the cylinder before the transfers close, leaning the mixture.
Note that if the mixture flowing through the case cannot get into the cylinder in time then the flow through the carb will not increase and it won't get rich and 4-stroke the same way. The air cannot accumulate in the case and pressurize it, so the flow will just not go up - a lot of the fuel/air charge from the previous revolution is still in there. The flow through the case that contains the fuel is being displaced by pure air through the strato inlet.
An alternative would be that the carb just can't flow enough fuel, but this is unlikely as it's a big carb and all of these carbs can flow plenty of fuel.
The problem is that there is no way to know what the high rpm fuel mixture is, as it's a balance of the squared fuel mixture effect of the carb and the delay of the flow to the cylinder. It might be getting just slightly richer or it may be getting leaner, and you'd need a dyno to figure that out - here the only thing that can be determined is that it doesn't 4-stroke. With a piston ported strato the timing of the two paths are at least coordinated, but not here.
El Moobs
Are we there yet?
OK Brad.......I drilled the seat from .024" to .034 (and was tempted to go further). I also drilled the main nozzle on thru like we do on the EL42. Now I can fatten it up and get it off the RPM limiter without any problem. In fact, drilling the main nozzle might not have been needed.
You drilled the needle seat? So the carb simply could flow enough fuel. Wow. Nice problem
El Moobs
Are we there yet?
Terry Syd and I are still digging into this carb. Looks like we're figuring out some cool mods to the EL42 as well. I'll share whatever we figure out.
tacomatrd98
ArboristSite Guru
I like when you two get along, I learn a lot more ****.
