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  #11  
Old 28th January 2013
rocketmangb's Avatar
rocketmangb rocketmangb is offline
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Good ? George !
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2006 Sportster XL1250C
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  #12  
Old 28th January 2013
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aswracing aswracing is offline
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Quote:
Originally Posted by rocketmangb View Post
What was the fix for the clutch issue ?
A new Energy One extra plate clutch pack and a quart of Formula+ and all is well!

Quote:
Originally Posted by Flybum View Post
Sumbitch! You guys keep giving me reasons, 108 of 'em, to part with my money. Tits man....tits.
Thanks bum!

Quote:
Originally Posted by Gcram399 View Post
Oh yea!! Now we're talking! It's good to see that you got that mule kicking again!
Great results! Congrats.
Thanks George .. man did it give us fits! But nothing to do with the engine kit thankfully.

Quote:
Originally Posted by DonChicago48 View Post
Way to go guys! Keep the innovations coming.
Thanks Don!

Quote:
Originally Posted by Rico 05R View Post
Way to go, Aaron and Hammer Dan. I'm enjoying all the new stuff you guys are doing.
Thanks Rico! Our 883 conversion bag of tricks isn't quite empty yet

Quote:
Originally Posted by rocketmangb View Post
So ah what about XB Sledge Hammer Heads over a 1250 ?
I predict HORSEPOWER!


Quote:
Originally Posted by tyler.woodard04 View Post
Sweet! Thank you hammer performance
Sorry for the false alarm there Tyler. We wanted to be sure.

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Originally Posted by hairy View Post
so whats the comp on this thing ?
10.5:1 on the dot!

Quote:
Originally Posted by Gcram399 View Post
Aaron, if 108 is the result of just some early tuning, do you think you'll see 110 out of this combination before you're done?
It might do it on this setup, I'm not sure. All I did was load up the map from the old setup. It was slightly lean (indicating a little better air flow) so I added some fuel. Almost immediately we were banging off 106's and 107's. I then took a little timing out, figuring this chamber configuration should give more turbulence and a faster burn, and shortly thereafter nailed the pull above. We stopped when we got that pull, we were both tired and hungry and wanted to go home. I literally had only 24 degrees of total advance in both cyls for the above pull!

BUT ... one of the things still in the bag of tricks is almost certainly worth a horsepower, in fact my calculator says 1.1. So even if I can't get there by fine tuning the current setup, there's no doubt in my mind that a 110 pull is within reach with a minor change inside the motor.

Quote:
I also didn't see Any Hammer Billet Intake on the parts list. Is the mule using one?
Nope, I don't have an EFI billet manifold yet. This bike still has it's bone stock efi throttle body and manifold.
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  #13  
Old 28th January 2013
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aswracing aswracing is offline
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Just an fyi ... one of the reasons this 30 degree setup works well on 883 heads is that it actually increases squish band surface area as compared to a flat top or reverse dome piston.

When you put a flat top or reverse dome piston under an 883 head with it's stock 3" chamber, you gain a 1/4" squish band around the perimeter of the chamber.

But the squish band we end up with this piston is actually a little bigger than that ...



These are Tyler's heads, cut for this new piston.

More squish area = more chamber turbulence = a faster and more efficient burn.

And of course, the 30 degree angle improves breathing by almost eliminating the shelf the air has to go around when entering or exiting the chamber.
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  #14  
Old 28th January 2013
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DaytonaSportster DaytonaSportster is offline
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SWEET!! This will give all those 883's dreams of being mean and nasty!
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  #15  
Old 28th January 2013
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Very nice!
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Hammer Performance 1250 kit w/ 30* Reverse Dome Pistons, Smash Level 883 Heads w/ 1.770 Intake/ 1.615 Exhaust & PAC Alloy Beehive Spring Pack, Impact 560 Lift Cams, Hammer Billet Aluminum Intake Manifold, Air Hammer Naked Billet Air Cleaner w/ 3" K&N Element, Mikuni HSR 42, Dynatek 2000P Ignition, Energy One Clutch w/ 15% Diaphram, Muller Power Clutch, Basanni Road Rage 2-1 Exhaust w/ 4" Performance Machine Billet Tip. Drag Specialties 8-Bolt Encapsulated Rotor, Cycle Electric Regulator and Stator.
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  #16  
Old 28th January 2013
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So, why go with XB heads when you are now making as much or more power out of the 883 heads? Have we had a mean shift in 883 HP?
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  #17  
Old 28th January 2013
~Grind~ ~Grind~ is offline
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Nice work Guys!
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  #18  
Old 28th January 2013
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Good chance ill be installing mine tonight. Think my clutch will be ok? Has 10k on it and just put that med duty spring in it.
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  #19  
Old 28th January 2013
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aswracing aswracing is offline
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Quote:
Originally Posted by DaytonaSportster View Post
SWEET!! This will give all those 883's dreams of being mean and nasty!
Thanks Daytona ... the funny thing though is that this bike is very mild-mannered and user friendly! We've specifically avoided bumping up the compression and going to radical cams ... nobody wants to ride a race bike on the street!

Quote:
Originally Posted by rottenralph View Post
So, why go with XB heads when you are now making as much or more power out of the 883 heads? Have we had a mean shift in 883 HP?
I have to admit, we're surprised at what we've been able to pull out of 883 heads with mild head work, mild cams, and moderate compression. This project started out as an exercise to prove we could do 100hp with that arrangement. That seems like such an easy mark now.

But in terms of XB heads, we're confident in saying that our 30 degree reverse dome setup under XB heads, like Grind has, makes 105hp an easy mark and 110 within reach. By comparison, we'd claim the 883 head version above makes 100hp an easy mark and 105hp within reach ... yeah, we get more than that, but not everyone has unlimited access to a dyno to try things and tune the bike to within an inch of it's life, so we have to derate our own results a bit.

Quote:
Originally Posted by ~Grind~ View Post
Nice work Guys!
Thanks Scott! I was starting to pull my hair out over this deal!

Quote:
Originally Posted by tyler.woodard04 View Post
Good chance ill be installing mine tonight. Think my clutch will be ok? Has 10k on it and just put that med duty spring in it.
I gotta tell you, I can't be positive anymore. This bike only had 8K miles on it's factory original clutch.

I'd say though that it won't hurt to try it. The tip-off for us that it was slipping was that during a wide open pull in top gear, the tach would pause at 6500rpm for literally a couple seconds. What had happened was it had slipped just prior to that, and at 6500 the torque had dropped enough that the clutch started biting again, and the rear wheel was catching up. I noticed that during that 6500rpm pause, the speedometer kept climbing.

So watch for that. I'd sure like to know if you see it, send me a note if you do please. I may need to revise my recommendation on the clutch with this new engine setup.
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  #20  
Old 28th January 2013
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Oh, Tyler, the other thing with the clutch is that we may have induced the slipping issue with the lube we used. When I originally swapped in the medium spring, I replaced whatever was in the primary with some Red Line MTL. When I swapped in the full clutch pack, I used Formula+. So that could be the difference, too.
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