Harley Sportster at Wilmington

[relaxedphit]

A Harley styled for looks and not aero.. Ma say it ain't so. While I loved my now demolished FXDX, The tach setup was like the one pictured and setup on my Triumph T-100 came similarly equiped. I haven't had a Sporty since my '94 883, so I have no idea if the two guage is stock on any of them. My FXDX was designated a Dyna Sport - insert laugh here; but it was a dependable friend that was defeated by a Ford Ranger that pulled out & stopped in an intersection. Apparently I have limited aero as well.

[55chevr]

if you want to run P/PP 1000 .... Buell XB9 Fireball is the only way to go.   That chin fairing plus the stock exhaust with a "Drummer" could get the record.  An open Sportster with a belt drive ... really tough row to hoe.

[rouse]

I would second the Buell if your looking to make things easier. It does add to the challenge to go with the Sportster, so maybe in the end that would be much more satisfying accomplishment.

Heck I ran a FXSE with front controls ( because that was the way it came), that was a ride.

Sportsters do have a long and impressive history on the salt, so why not give it a go. I think it's cool, at least they are still in production.

Rouse

[runt13]

there are gearing options for the belt final drive. I make trans pulleys up to 34t [but think the xl will only accommodate a 32t maybe a 33t.] then there's the 55 tooth international rear pulley.

revolution makes engine pulleys, both revolution and bandit make primary chains.

now you just need the power!

my record holding p/pp-1350-4, X1 white lightning has no engine work at all, we did everything with gearing, oils, bearings and riding positions. however the biggest help came from mother nature and a awesome tailwind!

I think its got 150mph in it if the conditions are right and I do my job. got to go into the motor for 160mph. for sure!

no matter what we are having way to much fun!

[rouse]

What does the -4 mean in the class designation? and what bike did you run in the 2000 and 3000 class?

[RansomT]

What does the -4 mean in the class designation? and what bike did you run in the 2000 and 3000 class?

-4 means 4 stroke as opposed to 2 strokers

We can bump up engine classes at ECTA

[rouse]

Simple explanation: I get it now.

Never saw a 2 cycle pushrod motor though

[runt13]

ransome 
the xl engine, 883, 1100, 1200, as well as the Buells [1986 TO 1990, 4 speed XL / 1991 to 2002 5 speed XL-Buell] all use the same stroke. they change the factory displacement with piston / cylinder sizes. the 1250 kit mentioned uses aftermarket cylinders for that extra 50cc.

 all you got to do is remove and install the size cylinders you want for different displacements.

[rouse]

A 883 weighs 3 # more than the 1200 rolling of the showroom floor. The difference is the wall thickness of the cylinders.

You bore 3#s of material out of the cylinders to covert to 1200cc's.

SCTA requires the use of OEM cylinders for the PP class engines.

Rouse

[TurboCat]

there are gearing options for the belt final drive. I make trans pulleys up to 34t [but think the xl will only accommodate a 32t maybe a 33t.] then there's the 55 tooth international rear pulley.

revolution makes engine pulleys, both revolution and bandit make primary chains.

now you just need the power!

my record holding p/pp-1350-4, X1 white lightning has no engine work at all, we did everything with gearing, oils, bearings and riding positions. however the biggest help came from mother nature and a awesome tailwind!

I think its got 150mph in it if the conditions are right and I do my job. got to go into the motor for 160mph. for sure!

no matter what we are having way to much fun!

Just fitted a 32T front pulley to go along with the 68T rear...calculator shows a theoretical top speed of 148.8mph @ 7000rpm. Wilmington being a standing start one mile course I'm thinking this might be all the 1250 can tolerate in that short distance...not that much time to get up to speed like a three-mile course. I welcome advice from any who have attempted similar in one mile scenario. I know it's going to be rough without much aero. Torque will peak at about 86 ft-lb @ 6000rpm before it starts falling away...110hp is recorded @ 7500rpm which I won't be exceeding on this motor. My gut feeling tells me this is going to be more like a slightly extended drag race than a typical top speed run like Bonneville...I've got what, less than thirty seconds to get it done?

EDIT:  With the new tire (160/60ZR17) I lose 5mph off the above expected top speed at the given rpm.

[rouse]

If I had your dyno numbers and your primary gearing, along with the transmission ratios 1st -5th and tire roll out. I can tell you exactly what it will do.

Without the numbers can't say much.

Rouse

[TurboCat]

With all the numbers I can calculate what it "should" do...what I'm looking for is real world experience from someone with a similar set-up running a standing start mile.  

Using this calculator with a 2010 883 punched in gets the numbers... http://www.gearingcommander.com/

[Uncle Jimbo]

Several years back in tech. (Maxton)  I was told I could not run M/PP  - the class does not exist.  Once I was in M -Modified I had to run PG  =  M/PG
Am I missing something here ?  M/PP is legit now ?   I was even running the old oem  Bendix carb on that old 1974 Sportster.
AMA/BUB Bonneville allowed the M/PP for several years but has since, closed that classification.
The old Gray Ghost will be at Wilmington for the June meet - M/PG  One last go around for the old Iron.   

See you all in a couple weeks
Jimbo

[rouse]

Never mind then.

Rouse

[TurboCat]

Several years back in tech. (Maxton)  I was told I could not run M/PP  - the class does not exist.  Once I was in M -Modified I had to run PG  =  M/PG
Am I missing something here ?  M/PP is legit now ?   I was even running the old oem  Bendix carb on that old 1974 Sportster.
AMA/BUB Bonneville allowed the M/PP for several years but has since, closed that classification.
The old Gray Ghost will be at Wilmington for the June meet - M/PG  One last go around for the old Iron.  

See you all in a couple weeks
Jimbo

That may be true Jim...just a play on letters but the results/bike will be the same. What does your bike run at Wilmington and is my analogy of it being a drag race fairly correct?

EDIT:  7.D.4 states the combo's, but it's still a little vague to me. The last sentence is especially mysterious lol.