Fins Sexy Twins!!
- Thread starter MillerModSaws
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MillerModSaws
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MillerModSaws
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MillerModSaws
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MillerModSaws
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Well of course we had to hack them up. This is picks of saw #1. I got all my testing done today so I know where I wanna take saw #2.
MillerModSaws
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On this saw I took .057 off the base and rest the squish to .024, epoxied the intake back up, and here's my numbers 100/120/79. Now on testing she was set up 28" bar 7 rim pin. I didn't gain a lot of speed in the cut but O my was it torquey. I reset it up with an 8 rim pin and there come the difference.
MillerModSaws
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And with out stringing you along any further. Here ya go.
MillerModSaws
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Now to make some adjustments and hack on #2.
o8f150
Tree Freak
looks like 2 POS to me
How does it stack up against your 7910?
MillerModSaws
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Well I tested them side by side yesterday. Both running the 28" bar 7 rim. My 7910 was faster. However I advanced the timing on the 661 today and switched the rim pin today but didn't get to test side by side.
Did you try it without putting epoxy in the intake? I'm running my intake at 85° and it makes great RPMs. You'll find that the timing advance really helps too.
MillerModSaws
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Not yet. That is second saw territory. That's why I left this one at 79! Next saw I'm gonna take the exhaust trans higher higher and leave the intake a couple degrees lower and lower the intake some. And then play from there.
fin460
Ham Fisted
Looking good.
Stihlofadeal64
Addicted to ArboristSite
drf255
BAD CAD
Why are you only raising the exhaust side?
Did you do any work inside the lower transfer tunnel?
MillerModSaws
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Small steps so I don't go backwards. And it's the rear because that's how the cylinder was factory. And on the tunnel I did open the tunnel entrance up some and blend it in.
drf255
BAD CAD
Seems Back asswards to me. But if it's factory that way, there's some engineering involved.
I guess the initial flow purges the exhaust? Starts the inertia of charge in the mains?
Exhaust pressure goes into upper first and pushes charge towards the intake?
I'm normally wanting to open my uppers towards the intake first, like fingers.
Those are some ****** factory bevels.
I guess the initial flow purges the exhaust? Starts the inertia of charge in the mains?
Exhaust pressure goes into upper first and pushes charge towards the intake?
I'm normally wanting to open my uppers towards the intake first, like fingers.
Those are some ****** factory bevels.
They don't really need a bevel when they're not that wide and are angled like that.
As far as the front transfers opening first, I've been doing that for a couple years now, but only a couple degrees.
As far as the front transfers opening first, I've been doing that for a couple years now, but only a couple degrees.
