I find the 461 to run best with short blowdown and long intake.
MillerModSaws and the PS-7910
- Thread starter MillerModSaws
- Start date
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MillerModSaws
USE2COULDBESPONSER!
Remember boys when I get this one built and see gains or losses we have 1 more so number suggestions are more than welcome to compare the 2. I am basically trying to work up an really good work saw recipe for this saw. Hopefully this will benifit all.
I'd keep the exhaust down on the next one. Raising the exhaust doesn't always make more RPMs. Look at the 346. I find that they run best with the exhaust at 105°-107°.
KG441c
Keith
This should be a good thread
KG441c
Keith
What #s Brad?
Hedgerow
HACK
Baby saw...
Hedgerow
HACK
If you took less out of the squish band, you could try one at 99 ex or so and go back if need be and correct.
Mastermind
Work Saw Specialist
I'm not saying it will kill it........the exhaust height isn't the most critical element on this saw. Transfer height is. That said.....raising the exhaust isn't too beneficial either. Working RPM seems to come from engine design rather than porting.
Now when you start building saws that you wanna see really spin.......less compression, both primary and secondary, helps free up rpm.
KG441c
Keith
So Randy this 7910s dual ports volume is already close to max without raising transfers much? Where is the biggest gain on this saw? Compression?
Mastermind
Work Saw Specialist
I'm not sure that I could nail down any one thing that nets the biggest gain........
Let's see what the OP comes up with here........I've derailed enough. lol
Let's see what the OP comes up with here........I've derailed enough. lol
KG441c
Keith
I hear u! Ive talked with Gary in pm on this one alil and interested in his build. Im just tryin to learn all I can while I got all u gurus in one place!!
MillerModSaws
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Derail away. This build thread will be slow as I don't have a lot of time in the evenings. The entertainment level must be kept up. Lol. I was just to anxious to see what u could do with one of these bad boys.
MillerModSaws
USE2COULDBESPONSER!
I marked out what I'm gonna do with the base but the side of the lower trans is still in thought process. Really leaning towards squaring the rear up like the front. Raising it the amount I took off the base and come out from the base square. So let's here some comments here.
Mastermind
Work Saw Specialist
I wouldn't touch it.
MillerModSaws
USE2COULDBESPONSER!
And when I i saw come out from the base. I'm mean take the red lines straight into the bore.You want the entrance of the transfer ducts side walls to be the same angle as the exit. Twisted ducts reduce flow.
MillerModSaws
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Flattop Burns
ArboristSite Lurker
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Sachs Dolmar was always a good thing. Are they still German or is it chinese because of when Makita bought them out? By the way the Makitas look just like those things same saw in blue in my opinion.
If you're going after long bar torque leave it.
Mastermind
Work Saw Specialist
Think about this.........every grain of material you remove will lower case compression.
