Mastermind
Work Saw Specialist
I can make one pretty damn quick.....:msp_thumbup:
Mastermind Meets a Brand New MS460
- Thread starter Mastermind
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I can make one pretty damn quick.....:msp_thumbup:
Mastermind
Work Saw Specialist
Although I really don't understand the hype about cutting the squish band. It makes the exhaust port have to be raised much more than if a popup is used. After machining a popup less is needed to put the timing numbers where I want them. On a D-shaped combustion chamber like the MS440 I just built it's the best approach IMHO though...
I think it's probably more applicable to the cylinders with odd combustion chambers or if a guy is using a taller piston.
If you're working on an engine that needs a lot more blow down, then it's a good thing too.
Mastermind
Work Saw Specialist
I quickly saw the need for a popup after building only a few saws. It's not possible to raise the exhaust port without offsetting the loss of compression.
Most guys mention being able to replace the piston with a stock, outta the box piston if the need arises. If I damage a piston there's a damn good chance that the jug will be toast as well. Add the that......I'll never use a saw enough to wear out a piston considering how many saws I own.
Needless to say I still like my popup pistons.....but I can build a saw either way.
wigglesworth
Booned
Needless to say I still like my popup pistons.....but I can build a saw either way.
Ahhheeeemmmmm......
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Mastermind
Work Saw Specialist
Ahhheeeemmmmm......
That's exactly what I'm talkin about!!!! :msp_thumbup:
I quickly saw the need for a popup after building only a few saws. It's not possible to raise the exhaust port without offsetting the loss of compression.
Most guys mention being able to replace the piston with a stock, outta the box piston if the need arises. If I damage a piston there's a damn good chance that the jug will be toast as well. Add the that......I'll never use a saw enough to wear out a piston considering how many saws I own.
Needless to say I still like my popup pistons.....but I can build a saw either way.
I've had some good running saws that had pop-up pistons, and I've had great running saws that didn't have a
pop-up piston or a squish band that was cut. I think it all boils down to how a saw is being tuned. I like Jeremy's method
of welding up and turning down a pop-up and then the cylinder is still within specs enough to replace that piston with
a stocker if need be. I agree though, usually when a piston becomes garbage, the jug has become garbage right along with it.
Mastermind
Work Saw Specialist
That welded popup is an option I am going to have to explore in more detail.
Just when a guy thinks he has caught up the game changes............again.
Bowtie
Gearhead
Ahhheeeemmmmm......
Now that's purrdy!! 346?
parrisw
Tree Freak
What about added weight of a welded pop-up.
wigglesworth
Booned
Yep. I gotta get to workin on it. I'm stuck in da house today with a sick little girl. She's more important though...
Momma caught me sleeping on the job earlier lol.
She's up and at em now though, just runnin a fever. Vanilla wafers and spongebob seems to help.
wigglesworth
Booned
That can easily be dealt with by doing some work under the piston and looking for areas where weight can be trimmed off.
Yep. I gotta get to workin on it. I'm stuck in da house today with a sick little girl. She's more important though...
Momma caught me sleeping on the job earlier lol.
She's up and at em now though, just runnin a fever. Vanilla wafers and spongebob seems to help.
She sure is cute. It's a good thing she looks like her mom....
wigglesworth
Booned
parrisw
Tree Freak
Cool, that's not much.
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komatsuvarna
Arboristsite MVP
Ahhheeeemmmmm......
Here's one I freehand cut!! I had a member weld it for me, and I finished it with a dremel and sandpaper. Lathe is much easier...and a little prettier too,,,I just don't have one lol.
steve316
ArboristSite Operative
weight of welded pop-up
In drag racing they ran solid domes;then they started running hollow domes. So why couldn't you profile from under the pop-up to reduce the weight. also the new dolmar 7900 piston comes with lighter tapered wall wrist pin.It takes a lot of aluminum to make a few grams. I have raced engines from 1.5 per cent over balanced to 5 per cent under balance with no effect on performance or life of the engine.as how this effect a chainsaw your guess is as good mine. Steve
In drag racing they ran solid domes;then they started running hollow domes. So why couldn't you profile from under the pop-up to reduce the weight. also the new dolmar 7900 piston comes with lighter tapered wall wrist pin.It takes a lot of aluminum to make a few grams. I have raced engines from 1.5 per cent over balanced to 5 per cent under balance with no effect on performance or life of the engine.as how this effect a chainsaw your guess is as good mine. Steve
Hey Bowtie,
What kinda bet are you gonna have w/ your buddie!:hmm3grin2orange:
I think he might
oop: himself.Looks like ya got a runner!
Bowtie
Gearhead
Hey Bowtie,
What kinda bet are you gonna have w/ your buddie!:hmm3grin2orange:
I think he might
Looks like ya got a runner!
LOL! I was thinkin on a case of Budweiser. Gonna be sending Mastermind a 361 pretty soon, as new as this 460 is!
I guess a case of beer is about right, if you say "slips" he might think your up to something.
Your aimin at have a full stable of MM'ed saws!
Have fun, and don't make him feel too bad!
Remember as soon as he finds out whats up, he'll be looking for pay back, might as well send a 660 to MM too. Just in case...:hmm3grin2orange:
