The chain is sharp. It just really hard, dead, frozen wood. I already richened up the 2nd one from the first runs I made. It got stronger. If it's still lean, then there's more in it.
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Porting the 361 Big Bore
- Thread starter blsnelling
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The chain is sharp. It just really hard, dead, frozen wood. I already richened up the 2nd one from the first runs I made. It got stronger. If it's still lean, then there's more in it.
The 2nd and fastest saw is the 361BB. It is very strong in the cut. The runs I've timed here where after I had already richened it up a little. It got faster after doing so. There may be a little more there yet with some timed cuts and fine tuning. The OEM P&C are strong, but no match for the BB. The little secret I was joking about...a MS460 carb. Bolts right on with minimal mods from an initial 1st glance.
stihlboy
Guess who's back
who is in the window???
2nd saw clearly runs faster out of the wood.
Seems like the times are close enough that if you ported another pair of cylinders, the winner might reverse. OTOH, if the Mahle is fully broken in and the fast one is the BB kit, then that would make the difference more than it seems on the video.
Do they both have the 460 carb?
Seems like the times are close enough that if you ported another pair of cylinders, the winner might reverse. OTOH, if the Mahle is fully broken in and the fast one is the BB kit, then that would make the difference more than it seems on the video.
Do they both have the 460 carb?
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The BB is 11% faster. That's significant. The OEM is well broken in where as the BB has only had less than a tank through it. Both have stock carbs at this point. I wanted to compare just the P&C for starters. I'll now continue building the 361BB.
Lakeside53
Stihl Wrenching
Based on the wear we saw in a previous pic, the BB piston is well broken in...
stihlboy
Guess who's back
come on brad who????
My wife or my 10 year old daughter. Why?
stihlboy
Guess who's back
it was just one of those things that will bug the crap out of you if you don't know the answer
stihlboy
Guess who's back
it was buggin me and i really wanted to know sorry
No problem.
stihlboy
Guess who's back
the avatar kinda messes with ya, it reminds me of your dad no offense
LOL. That made me laugh.
volks-man
Arboristsite.com Spooner
?s
nice job!
thanks for the vid.
what rpm are the saws turning?
nice job!
thanks for the vid.
what rpm are the saws turning?
stihlboy
Guess who's back
its just every time i see it i invision your dad with that camera just a smilin away
I didn't check tonight. The OEM usually around 15,100. I don't have much time with the BB but will be in the ballpark of 15,500-15,800.
Lakeside53
Stihl Wrenching
WOT doesn't really count..... What are they turning in the cut?
volks-man
Arboristsite.com Spooner
the reason i ask is because they really do sound like they are 'screaming'. very high pitched saw sounds!
lakes question is a good one though. do you record in-cut rpm?
WOT is only an indicator. Doesn't mean much if you raised the exhaust roof and killed compression to get them. I don't really think RPMs in the wood counts either. The BB is faster because I can push on it harder than the OEM. The OEM would stall if I pushed as much as I am on the BB. It just like the 7900 Slingr built. If I don't really load it down, I saw >13K in the cut with a square ground chain in a different log last night.
the reason i ask is because they really do sound like they are 'screaming'. very high pitched saw sounds!
lakes question is a good one though. do you record in-cut rpm?
They are screamin'!
But nothing out of line with other modded saws.
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yo2001
ArboristSite Operative
How much faster in percentage? The BB kit sounded like its turning some rpm. Good build as usual.
