Can someone tell me what is involved in building the 96" twin cam engine? I am wanting to get around 120 to 130 ft lbs torque coming in around 2200-2400 rpm and around 130 hp. I was told the crank bearings had to be upgraded, because they won't hold up after 105 to 110 hp.

 

Those numbers are a little unrealistic for a 96" build, you might want to consider larger displacement or perhaps a turbo.

Chris

 

I think the S&S 124 is about 150 Hp. I think that would get you to your number. I dont know if these will fit in a stock HD frame.

 

I will be increasing the cubic in. just haven't made my mind if I wanted to go 103",110" 116" or 124" kits yet or what would even work. I didn't want to split the cases either.

 

I would have to guess that for those numbers you would need to builld up a 124" and build it just about perfect. You could achieve the horsepower number with smaller displacement but you would end up in the upper RPM range. You need to be more realistic with your build up goals.

What do you want to build the motor for. Bar hopping, cruising or Touring?

 

With your 96" it is a stroker from the factory. You can change pistons and cyl's and get 107" and close to numbers you want. When going to this HP you want, most will suggest Timlen upgrade (split cases) along w/better cam plate, oil pump, clutch........ I suggest you call a builder and tell them what you want. R&R, Headquaters, Hillside, GMR, King Of Cubes and they will discuss what you can do. There are oversquare, undersquare, fast reving, upper rpm power, pwr through the entire torque band......all types of parameters you need to think about when you spend the money your gonna spend to get the power you state.

 

Its used for crusing and bar hopping, i just spoke to a guy from Houston about it, if on a budget, he said go with 103"he said he could get 100 hp, if not, go big, since the cases have to be spilt anyway to upgrade the crake, crank bearing and such. About being realistic, i am, maybe i need to explain better what I am after, I have a tendecy to overbuild things to make them a little more bullit proof and last a little longer, Since this is my first Harley to builld, i want to make sure that there is nothing i overlook, i want to know where the weak areas are that need to addressed and what this engine is capable of putting out.
With that said, in order for me to achieve my goals, what must be done? From what I gathered so far, I am looking at spending 5,000 to 7,000 to get it. Whether I build a 103" and put a Magnacharger supercharger on it or build a 124", the cost is almost the same to get the hp and torque i want. And I dont mind spending money for what I want.

 

well i have a 103 in my bike and i am getting 97 hp and 103 tq. i will not get the numbers u want out of a 103 with out adding a charger or something. and if you do that and get them numbers somehow i can not see thw motor being very reliable at all.

 

While the build you put together will need to be "coordinated" for your power application, imo you can go "all out" on bullet proofing your motor at any power range. GrampsWyatt said it with upgraded cam support plate, oil pump, Timken swap, and I'll add roller rockers.

I think you could pull off those numbers even breathing normally, but man it'd be expensive.

 

Check out Head Quarters. They have kits that'll get you into the 120 hp/ft-lbs range. The real key to good numbers is the head-work. You should be able to get better than 1 hp/ft-lb per cubic inch with the right cams and head-work. Just as an example, I had HQ do my heads, installed a set of their HQ-0039G gear drive cams and an HQ-6104 ignition module pre-programmed by them. My carb is badly in need of agood tune, and I'm running 2 into 2 straight pipes (V&H Straight Shots) with Thunder Monster baffles. With stock displacement of 88ci and stock compression of around 9.0:1, I'm getting about 83 hp and 89 ft-lbs. I will pick up a few of each with a good tune, and I am planning on putting the stock baffles back in.

On HQ's USA site, you can virutally build your engine. Check it out HERE

Cheers!
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