8.9 second 124ci

[bathbeach]

In the AHDRA Mike Robert's bike built by Joe's Hawg shop went 8.9 in the 1/4. Wow what is their secret??? what is the difference between this motor and the garden variety S&S 124???

[HDWRENCH]

Below is a list of the parts and rules for the engine. Compression is not set from what I have gathered. many loop holes on what you can do.. this is racing so they work these engine to make mage power for the track.




S&S® UNASSEMBLED 124 ENGINES FOR THE AHDRA 124 CHALLENGE CLASS


S&S 124 Challenge engines are designed specifically to compete in the 124 Challenge class of the AHDRA. They are available in unassembled form and with natural finish only, since it is assumed that aesthetic and performance modifications will be performed to prepare them for the track. They are intended for the racer who wants to take full advantage of all the modifications allowed under the 124 Challenge class rules.

Engines are available with Super Stock® cylinder heads or with S&S Big Fin SA-B2 Special Application cylinder heads. Builders can also choose between standard style flywheels and the new “pork chopped” flywheels, which are considerable lighter for faster acceleration. 124 Challenge engines are available for 1984-’99 big twin chassis and for stock 1999-up big twin chassis. Engines do not include a fuel delivery system. Order Super D or VFI.




S&S 124 CHALLENGE ENGINES FOR 1984-’06 CHASSIS



Cylinder Head Style


Flywheel Style
For 1984-’99 Chassis
For 1999-’06 Chassis

Part No.
MSRP
Part No.
MSRP

S&S SA-B2 Big Fin
Standard
31-9744
Call
31-9684
Call

S&S SA-B2 Big Fin
Pork Chopped
31-9638
Call
31-9636
Call

Notes:

Engines for 1984-’99 models come with cast tappet guides and gear cover.

Engines for 1999-up models include the S&S oil pump and oil filter bracket.


Below are the rules for this class ( engine only)

SSC CLASS
[S&S 124 CHALLENGE]
Designation: "SSC" followed by bike number.

Reserved for V-Twin cylinder configuration motorcycles powered by S&S 124 c.i. Super Sidewinder Plus Evo style or Twin Cam engine competing heads up on a .400 pro tree. Motorcycle must be ridden under its own power to staging, starting line and back to the pit area after completion of run - no towing or pushing allowed (except for verified breakage after the conclusion of a run). Minimum weight at conclusion of run, including rider, must be 682 lbs.

Requirements and Specifications


ENGINE

Engine: Must be S&S 124 cubic inch Evo style, or twin cam style, or TC with V2 mounts, and must use all S&S “124” components. S&S logos must be clearly visible. S&S pistons are supplied with a dry film lube from the factory. No additional internal engine coating is permitted (i.e., friction reduction or thermal barrier treatments). Crankcase and all tanks containing fluids must have vent tubes routed to a catch can or have a non-spill breather system on the motorcycle.

Configuration: 4-1/8 bore x 4-5/8-inch stroke. Maximum overbore .030. Connecting rod length 7.668.

Induction: Naturally aspirated S&S VFI with supplied module or one S&S carburetor or S&S G-Extreme Dual Carburetor System. VFI must use a radiused inlet, air cleaner assembly, or tuned runners. Carburetor(s) may be modified and air filter, velocity stack, or radiused inlet is required.

Cylinder Heads: Must use either S&S SSW or B2 style heads. Porting is allowed, but the original factory port opening size, shape, and location must be maintained. Oversize valves are not allowed. No titanium valves are allowed. Valve sizes are to be as follows. For the SSW head: 2.00-inch int. and 1.605-inch exh. For the B-2 head: 2.220-inch int. and 1.800 exh. Stock 124 rocker arm or S&S part number 90-4098 (1.725:1) rocker arm only.

Pistons: Any S&S 4-1/8” bore (up to +.030 oversize) piston may be used. Piston crown and valve pockets may be machined for clearance. Gas porting of the top ring is allowed. No welding or other piston modifications are allowed.

Camshaft: S&S .640 or .675 lift grind only.

Fuel: VP Racing Fuels C-25 is the specified fuel. No Fuel additives and /or combustible oil additives are allowed. Dielectric constant, as per AHDRA testing meter, must match baseline reading of specified fuel. Fuel must match color of specified fuel. Fuel must match AHDRA generated graphs in random Gas Chromatography analysis

[DBChoppers]

There is a huge difference between them, SA engine case, B2 heads, pork chop flywheels and allot of secrets. The spec fuel for that class is VP C25 you need a comp ratio of 15:1 or better (most run about 16:1) to utilize that fuel. You can check out the rules here www.ahdra.com/rulesssc.html

If you would like one built give us a call we would be happy to accommodate you.

[DBChoppers]

Jesus Steve, you sure do type fast

[HDWRENCH]

HA HA I have the entire rule book saved Drag racer to the end of time LOl , copy and pasted that right out of the rule book.. And the compression is a open end deal without a doubt. Can you say cackle cackle???

[Hillside]

Holy snot-balls!!
With a B-2 head @ 15:1, and the .675, and a modified D carb, or the Dual-G's, I have to think that 8.90's would not be a big struggle.
Went 8.80's/148 over 10 years ago with our 108", with a damn rotary-lid 4 spd, and a chassis that moved all over the place.
Scott

[oh1deuce]

Mike Roberts of Clinton, OH, racing for Bandit Racing, broke all previous records set in the AHDRA 124 Challenge category. Mike set a new eighth-mile ET and MPH of 5.677/121.58, as well as a new quarter-mile ET and MPH of 8.971/147.17, breaking the records he had set over the past several years.


From early June in Ohio

[hightop]

Originally Posted by Hillside

Holy snot-balls!!
With a B-2 head @ 15:1, and the .675, and a modified D carb, or the Dual-G's, I have to think that 8.90's would not be a big struggle.
Went 8.80's/148 over 10 years ago with our 108", with a damn rotary-lid 4 spd, and a chassis that moved all over the place.
Scott

That's true, but know that the 124 class is DOT tires, no wheelie bars, and no air or electric shifters allowed.

Not knockin' what you accomplished.

[01fxdx]

carbon fiber wheels, tiney brakes, fetherlite front end and works performance shocks, this bike is the coolest thing i've seen in a long time. could be had today for a meer 30,000 bux.

[01fxdx]

i watched the 8.90 passes in norwalk. how much fun would it be showing up at a race and have 1 other bike in your class.....

[Hillside]

Originally Posted by hightop

That's true, but know that the 124 class is DOT tires, no wheelie bars, and no air or electric shifters allowed.

Not knockin' what you accomplished.

DOT street tires, ie slick with tread, but you make a good point.
A Dyna 2-step, with a shifter would pull the ET down/mph up.
Scott

[claydbal]

a little trivia, the G2 126 motor makes more power, and is standard height! but it cant run in the proprietary 124 challenge class. it can run other classes that state 124 max, 126 absolute.

wasnt it genious to create a class that only one company produces engines for?

[bathbeach]

Originally Posted by 01fxdx

carbon fiber wheels, tiney brakes, fetherlite front end and works performance shocks, this bike is the coolest thing i've seen in a long time. could be had today for a meer 30,000 bux.

These bikes are not light. Assuming the rider weights 200, that would make the bike about 475lb dry. Read in an old magazine of a fast Panhead back in the day (Big Berta???) that weight in the neighborhood of 375lb. I could be wrong.

[HDWRENCH]

Have a local guy with a zippers 4 cam engine with tons of parts from turbos to dual carbs. brand new engine bike had gone 7.80s will complete this build for what ever buyer wants to run. Race gas, mix, or straight alcohol. 9grand complete. Wheelie bar bike , Zippers race trans yada yada. I looked at it hard but no local track and even on race gas too much for the treet although the bike is a DOT legal bike now. AZ has some very easy rules LOL

[Hillside]

Our AHDRA 108" Mod bike would tip the scales at 580 with rider.
Scott