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ms 461 woods port race thing

drf256

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I tested the saw with a stock piston, timed cuts. I then swapped the piston with one with a 4deg duration bevel n the exhaust port. tested and timed cuts. saw was faster and stronger. this tells me to raise the exhaust 2 deg and test again. if I get a gain, then raise 2 deg more. repeat till either no gain or it starts going south. put stock piston in and it will be 4 deg shorter timing. doing this allows me to back up without starting over with a new cylinder.

the other pistons are for the transfers. I was to cheap to buy a 4th piston for the intake, so I ended up grinding it to far. easy fix but loose time for testing.
Smart R&D. I love it.
 

XP_Slinger

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Very informative R&D. Once you figure out your individual port timing with the different pistons do you “feel” further gains once ports are widened with the new timing? Just curious. That Saw turned into an animal just by adjusting timing with the piston grinding. Great thread Scott
 

tree monkey

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I cut base and squish, widened ports, set port timing, advanced ign timing, muffler mod, some carb work was all done before test 1. from there I use the different pistons to find more gains one port at a time. how the saws feels tells me as much as the timed cuts. I want the saw to be pissed off, angry.
 

drf256

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I cut base and squish, widened ports, set port timing, advanced ign timing, muffler mod, some carb work was all done before test 1. from there I use the different pistons to find more gains one port at a time. how the saws feels tells me as much as the timed cuts. I want the saw to be pissed off, angry.
Very Intelligent choices Scott. Always been impressed by your work. R&D at its best.

A smart no frills approach to what will gain and what wont.

I'm gonna have to follow your lead on this one.

How did you carve the piston reliefs? By hand, or on a Mill?
 

paragonbuilder

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Very Intelligent choices Scott. Always been impressed by your work. R&D at its best.

A smart no frills approach to what will gain and what wont.

I'm gonna have to follow your lead on this one.

How did you carve the piston reliefs? By hand, or on a Mill?

In case you missed his pics Doc
7dd9952f616d8c887dfd418a942ce75a.jpg
 

tree monkey

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Very Intelligent choices Scott. Always been impressed by your work. R&D at its best.

A smart no frills approach to what will gain and what wont.

I'm gonna have to follow your lead on this one.

How did you carve the piston reliefs? By hand, or on a Mill?

I did them by hand. would need a turn table/ index to do them on a mill
 

tree monkey

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Looks to me the the intake upper transfer on pto side needs a little more aiming towards intake, and roof is aiming up more than the other side, needs to be flattened.

think about how wide the tr ports are, how narrow the bridge is, what part of the tr is feeding
 

Redfin

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What are the rules for muffler for this saw Scott?
 
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