Hi I have a 2008 Fatboy with the factory 96" motor,went to my dealer today to talk about the big bore options. So to go to the 103" screamn eagle it will cost about $2,100 for parts and labor and also a pro R hypercharger,the next option is the 113" screamn eagle for $5300 for parts and labor and also with pro R hypercharger,thats seems to by a little spendy so I'm wondering if any of you guys have better suggestions on what to do with my motor. I don't really need all the power in the world, but would also like to have a little edge on the next guy. Any help would be really helpful and thanks for any help.

 

My advice would be to find out who the really good independant shops are in your area.
In most cases they will have more options and will build to suit.

 

Head work and cams are the real secret for power. Think about it: 96 cubic inches, that's alot of cc's. The jap bikes are running in the 1200 cc's and make ungodly power. I had a Kaw ZZR1200 that had 145 hp with almost a 100ftlbs of torque.

I believe if the heads are ported and polished and maybe some off the deck with the right cam, springs and valves you will have one fast ****. The next question is how do you get it in the 8 and 9 K rev range. Thats the real downer with the Hogs.

 

for not near as much:


upgrade the air intake and exhaust systems if not already done.

consider the andrews 54 cams - getting rave reviews on the forums right now. (or other aftermarket cams or harley cams that your mechanic would suggest as a part of a complete package).

you might want to up the compression a tad with a set of cometic gaskets. simply changing the cams to something like the andrews 54's and dropping in a thinner head gasket in itself will give you probably all the increase in performance that you want without going any farther (unless you get addicted to performance).

if you want to go farther, then get someone like big boyz or another reputable specialist to do some milder head porting - you don't need high end heads unless you are looking for big performance.

add the increased displacement up to 3.875" bore cylinders if you want to go that far. (i would have your current cylinders bored out to match the pistons you will have to buy for the 103 package if you go up in displacement - much better than just buying the big bore kit with factory cylinders and pistons).

of course, you will have to get your ignition upgraded whatever you do. don't overlook that step when the components are in place.



if you want the hd warranty - go with the dealer. some are good and can put a nice engine together, some just bolt components together and get average results.
i personally have had several dealer upgrades and they do not compare with a good indy shop that puts together a total package - matching the compression to the cam choice, porting the heads to match the desired engine build, etc. i am not saying an independent shop will have no problems, but i would rather have a nice package than the mediocre hd package where i have to deal with harley - that is not always a certain affair in itself.

 

head quarters 107 kit, great touqe and horse power and its a bolt on kit !!!!!!!!

 

Thanks for the input. So the way it sounds I should find a indy shop and let them do some work that will be cheaper and probaly get more power out of it.

 

I'll tell you, what drdave said about that new Andrews 54 cam.

Cam +/- 300.00
TMax +/- 870.00
.030 Head Gasket +/- 35.00
Misc gaskets/bearings +/- 100.00
5 hours labor (my rates) 300.00

So 1,600 and half that is the TMax.

Add a SE air cleaner and a decent set of 2 into 1 exhaust you should see 100-105torque and 85-95 hp. You'd smoke that 103" build your dealer wants $2,100 for.

 

I was not familiar with the andrews 54 cam so I went to their website and from the specs I wouldn't use this cam unless your comp. ratio was at least 9.8:1. It's intake closes at 42 degrees abdc. Unless you raise your compression up your cranking pressures will suck and you won't have much bottom end where most of us ride anyway. Get with an indy that can set you up with a combination of cams, porting and compression to get 170 - 185 cranking compression. This makes for a great street motor that has great roll on torque. Peak numbers only win at the drag strip or bench racing!

 

Well you fly in the face of real data.

From other HD sites posting results from the 54 cams:

. . .is working on the 103 and I just did the bolt in 96" no head gaskets (AC & true duals) and posted the87hp 102tq dyno. (stock compression)

Lots , and I mean LOTS , more TQ. very flat tq. curve , no high and low spots ,just pulls hard all the way from 2500 - 5500 rpm.

Just got off the dyno. . . . (stock 96" AC & Kerker slip-ons) VERY flat TQ. line. 80.63 hp. and 88.27 tq. SAE. . . No BLACK box , yet. Very impressed with this cam. With a goodtune. . .close to 90 hp. and 100 tq.

The 54s do very well as a drop in cam, that's how Andews designed them,and a little better with a .030 headgasket.The 96" compression stock should be 9.5:1 and with a .030 HG 9.8:1. The Andrews specs should the 54 requires hi-lift valve springs but that is a mistake. Another nice spec is the 54 base circles are just enough smaller that with the .030 head gaskets you can use the stock pushrods.

I'm sure there are other dyno results from this cam out there, and from early results there will be a lot more. This is a true 100 tq bolt in cam for the 96" motor.

 

Hey fxrp, do you have links to that discussion / information?