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Buell Motorcycle Forum » XBoard » Buell XBoard Archives » Archive through April 10, 2004 » Lets talk HP and TORQUE « Previous Next »

  Thread Last Poster Posts Pages Last Post
Archive through April 02, 2004Blake30 1 04-02-04  12:30 am
Archive through March 31, 2004M1combat30 1 03-31-04  03:59 pm
Archive through March 30, 2004Blake30 1 03-30-04  01:29 pm
Archive through March 29, 2004Hootowl30 1 03-29-04  09:27 am
         

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Jmartz
Posted on Friday, April 02, 2004 - 08:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
AAron:

Will a 3.5 stroke use a 6.770 rod?
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Aaron
Posted on Friday, April 02, 2004 - 09:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Well, if you shorten the stroke by .3125 and you want to keep the piston's pin height the same, you'd have to make the rod .3125/2 = .1563 longer ... 6.926 + .1563 = 7.082". But that's a custom. I'd suggest a 7.113 rod (available off the shelf from S&S or Carillo) and adding an extra base gasket or two, that'd be the simplest way.
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Sarodude
Posted on Friday, April 02, 2004 - 10:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Anyone know the rod lengths / strokes of various 1 litre twins out there? RC51? 999? TL? It'd be an interesting comparison with the short stroke Buell.

-Saro
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Jmartz
Posted on Friday, April 02, 2004 - 10:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Thanks Aron, I went the opposite way in my calculation.
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Jmartz
Posted on Friday, April 02, 2004 - 10:41 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Another alternative for an off the shelf rod length is to have the stroke adjusted accordingly since it has to be done anyway.
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Jmartz
Posted on Friday, April 02, 2004 - 10:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
A 7.113 would have a 3.44 stroke if my calculations are correct this time.
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Jmartz
Posted on Friday, April 02, 2004 - 10:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Or have AAC mill the jugs a little less for more length.
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Jmartz
Posted on Friday, April 02, 2004 - 10:47 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Raising the top end might will be additional trouble though with front mount, exhaust and manifold fitment.
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Aaron
Posted on Friday, April 02, 2004 - 11:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
You worry too much. These height differences are in the noise. People move things more than that all the time by just changing gasket thicknesses.

My guess is you'll get to zero deck height with just one additional .018 base gasket. You'll be using a head gasket that's at least that much thinner to get your squish right anyway. So that combination overall is gonna come in right about stock height.

It's not unusual at all for people to do combinations of milling & gasket thicknesses that drop the top end .040, .050, .060, or more. Sometimes you've gotta narrow the manifold a little, as well as use short (or adjustable) pushrods. We even sell a set of .040 shorter than stock non-adjustable pushrods for exactly this reason. But it's not an issue for the motor mounting, it can tolerate quite a bit more variation. Hell, I use a stock motor mount with my 100" motor, and it's a quarter inch taller than a stocker.
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Shotgun
Posted on Friday, April 02, 2004 - 09:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Dyno'd my 9 today, don't have a scanner. 85 hp, 68 pounds torque. Big dip 2400 to 2800 then pulls nice to the top. Mechanic tried to trim the dip with the Power Commander but couldn't. 10.50 Kit, Aaron's Stage III heads, Force exhaust, 12 airbox. Motor "snarls" nicely except at that dipsite.
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Blake
Posted on Friday, April 02, 2004 - 11:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Can you post the chart?... On the Dyno Chart page in the Knowledge Vault? Please? : ]
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Blake
Posted on Friday, April 02, 2004 - 11:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
If you have a digital camera, snap a pic and post it.
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Bigj
Posted on Saturday, April 03, 2004 - 01:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Speaking of that, Jim A. overlaid the hp curve of the XB12 against the new literbikes' curves over at
www.sacborg.com

pretty interesting.
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Airbox
Posted on Saturday, April 03, 2004 - 07:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
had my 12s dynoed at about 1500 miles, completely standard and made 93.0 hp at the wheel which I thought was pretty good. The guy who dynoed it for me said to expect a few more bhp as more miles go on it. So with a decent can. chip and filter it should see 100hp I reckon. He didn't do a torque graph as apparently it takes longer to set the machine up and it was on an dealers open day and freee dyno runs.
Great bike, really pleased with it except for one thing, that f***ing exhaust is a heap of shite. Why make it out of mild steel. I have had the bike for 5 1/2 months, done 2100 miles never let it get dirty, don't take it out in the wet and it is already rusty. They do salt the roads in the UK but as I said I only really use it in the dry. It spoils what is otherwise a great bike.
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Dyna
Posted on Saturday, April 03, 2004 - 09:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
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Blake
Posted on Sunday, April 04, 2004 - 12:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Interesting. An XB12R spinning to 8,300 rpm. yeah right Whoever did that graph got it wrong.
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Reepicheep
Posted on Sunday, April 04, 2004 - 09:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
You can spin an XB12 to 8300 rpm...





Once ; )
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Dyna
Posted on Sunday, April 04, 2004 - 10:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Jim overlaid it on there. If you look at the max hp it says 6600 rpms. Obviously he just started the graph in the same place as the 4 other bikes.
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M1combat
Posted on Sunday, April 04, 2004 - 03:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
It's way off dude...
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Opto
Posted on Monday, April 05, 2004 - 05:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
So are you saying the Buell's making 22HP at 500rpm? : ) sorry just had to throw that in!
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