unclecharlie
Loquacious
Reged: 02/17/06
Posts: 3096
Loc: USA-CT-NORWALK
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I wish we had chipped in and put Bill's stock bike on as a baseline.
I'm confident in the dyno #'s anyway. And my hp curve crosses
50 @5500 rpm.
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Frank
Loquacious
Reged: 01/11/05
Posts: 3753
Loc: cambridge massachusetts
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i thought is was bogus also. i was talkign to pat and we both looked at eachother when we saw those numbers. that is what made us dyno ours. as you can see we both dynoed less than expected so maybe he just has one of those bikes. who knows.
Frank
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(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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ArsnlTim
Adjunct
Reged: 05/30/07
Posts: 730
Loc: New London, CT
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I think we're forgetting the most important aspect of my bike as opposed to everyone else...
I'm using Suzuki Oil 
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Let my dying thought be that every mile was fun and let my tombstone read,"They never made one fast enough for me."
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bonnyusa
Big Bore
Reged: 01/11/05
Posts: 9218
Loc: Ft. Liquordale, Fl.
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Crikey! That Suzuki oil again!
Quote:
go one size down on my main jets, put 2 shims on my needles
To me, that is effectively the same as you have now mostly because of the taper of the stock needles (Ed's spreadsheet above does not mention TBS for you so I assume stock needles).
What did you go down to, 155s?
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"Never underestimate the power of human stupidity" - Robert Heinlein
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Zmilin
Saddle Sore
Reged: 03/02/07
Posts: 5131
Loc: Sammamish, Washington - USA
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So...knowing the following:
865 cc = 54hp@6750, 51ft.lb@4800
790 cc = 61hp@7400, 44ft.lb@3500
I dont see it impossible that an America or Speedy with the 790 motor could get up to about the 70hp/50ft.lb range. Especially if its getting the fuel and air needed.
After looking at some other info:
Specialty Spares claims 65 Dynod HP with their pipes (Iassume on a 790), UNI and jets.
Thunderbike claims 68 Dynod HP (on a 790) with pipes.
Sorry...no torq info from either. You get the point though.
Whats really bugging me is that those of us with newer 865 cc bikes will only get minimal increases. 
Thoughts anyone?
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07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
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ArsnlTim
Adjunct
Reged: 05/30/07
Posts: 730
Loc: New London, CT
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Quote:
Quote:
go one size down on my main jets, put 2 shims on my needles
To me, that is effectively the same as you have now mostly because of the taper of the stock needles (Ed's spreadsheet above does not mention TBS for you so I assume stock needles).
What did you go down to, 155s?
I don't pretend to know a whole lot about how exactly the carbs work so if I'm way off base maybe someone like pat or bucky can back me up but from my understanding you're correct, it the same, or close to. If you look at my dyno sheet the air fuel mixture runs pretty much straight on the line but it starts high (leaning the mixture screws solved that) than it dips lean and runs back to the high side in the upper RPM range. By putting the shims on the needles it brings the entire line up and straightens it after the idle circut fixing the lean dip in the middle. Going down on the main jets brings the straightened line back down to the correct setting giving me a straight line all the way across the RPM range. Also since the mixture is straight all the way through the RPM range it fixes the fluxuations in the torque curve where the lean dip was. And again, thats just my understanding of how it works and I could be off base so if I'm wrong could someone smarter than me back me up
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Let my dying thought be that every mile was fun and let my tombstone read,"They never made one fast enough for me."
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oldroadie
Worn Saddle
Reged: 05/05/07
Posts: 6000
Loc: Alabama USA
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Tim,
Regarding the A/F chart, above the line is lean, below the line is rich. Looks to me that when your carbs engage the main jets the bike runs a tad rich, then as the throttle opens it heads back to the lean side. I'm thinking down a size on the mains to adjust that 5K dip with a shim to richen the rpm zone where the pilots are working and you should be golden. The carb guru's will know better if this is correct  (I suspect they might offer to skip the shim and increase the pilot instead)
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bonnyusa
Big Bore
Reged: 01/11/05
Posts: 9218
Loc: Ft. Liquordale, Fl.
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Hey Tim,
If your numbers came in good with the changes and flattened the A/F, I'd say leave it!!
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"Never underestimate the power of human stupidity" - Robert Heinlein
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Bucky
Loquacious
Reged: 05/21/06
Posts: 3971
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Don't ax me - I make it up as I go along
Quote:
So...knowing the following:
865 cc = 54hp@6750, 51ft.lb@4800
790 cc = 61hp@7400, 44ft.lb@3500
I don't see it impossible that an America or Speedy with the 790 motor could get up to about the 70hp/50ft.lb range.
I agree. I imagine we gain 3 or 4 horses as soon as that stock pipe is opened up or changed. They're pretty well gagged off when in factory trim. See also - sewing machine on 2 wheels factor on the ride home from the dealer. I remember pulling into the driveway, and wife and daughter, who don't know a motorcycle from an aircraft carrier remarked something like: "That's a great looking bike, but it sounds like, uh, a Waring blender, electric drill, sewing machine..."
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ArsnlTim
Adjunct
Reged: 05/30/07
Posts: 730
Loc: New London, CT
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Quote:
Hey Tim,
If your numbers came in good with the changes and flattened the A/F, I'd say leave it!!
The run thats posted is pre changes, it was with the jets that came with the freak and seat of the pants mixture screw adjusting. After the run roger gave his suggestions and I followed them to a tee, I haven't done another run to verify his accuracy yet but after I made the adjustments I could feel the difference in smoothness all the way through the RPM range.
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Let my dying thought be that every mile was fun and let my tombstone read,"They never made one fast enough for me."
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