After two weeks, took mine to Brian at "My Garage" in Ventura to perform a Dave Mackie "Megasphere" head job and Dave Mackie 598gear driven cams with a "Power Commander", "Rinehardt True Duals", "Screaming Eagle" high flow breather, 2.5 hourson the Dynoand about $4600 for all including labor netted me 101HP & 104TQ. I'm sure someone will be able get more HP & TQ with less money. But I'm happy. Oh.... wait a minute.... almost happy. I still need to upgrade my clutch and brakes. Damn.... more money! Excuse me while I get back to work.



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I'm interested in the same thing. I have the SE A/C, T-Max, and Fat Cat. If I want some more low end grunt, what's next? Does it make sense to do cams and see if that is enough? What cams for grunt? I'm new to working on bikes although I'm a pretty good mechanic. What (briefly) is involved in replacing cams and in doing a big bore kit?

Thanks.

 

Well said Glideman!! As far as fuel mileage, if that is a concern, then stay stock.I have a 103 stroker build and get about 130-150 miles to the tank full. Depends on my wrist as to mpg!!

 

Idon't know what fuel mileage I get cause I seldom measurea tankful. I just fill it when it get's low and pay no attention tomileage to be honest,and I doubt it has changed more than 30% or so. To answer PawnBrokers question, I would hold off doing cams until you are ready to add a big bore kit. A kit will usually consist of larger diameter pistons, (usually a forged dome or flat top of 9:5.1 or 10:5.1 compression) with your existing cylinders being bored out and honed to a larger sized piston, or purchasing after market high performance jugs from R&R, Axtell, or others.

Many companys can bore your existingcylinders or supply you with an aftermarket big bore kit (which provides less down time as they can be swapped in a matter of hours). These companies are located all across North Americaa few of which would includeGMR Performanceof Arizona,Zippers Performanceof Maryland, Headquarters of Michigan, and NRHS of Colorado. A big bore kit will often include head service where you can opt to port& polish your heads, CNC Machineyour heads, or strap on a set of high performance CNC machined heads that flow some real power. From thereyou will then need to address cams and match them to your engine build, andyour riding style. That being said, cams are not the only thing that determine your horsepower and torque as they also match up with your choice of pistons, cylinders, and heads. Too muchlift orduration can effectively can kill your bottom end torque, and too little cam will leave you longing for more power. That's why I suggest you wait and do cams when you can also do the jugsor the heads. This will allow you to use a cam that is better matched to your build orriding habits, and this will provide you with maximum gains without having to do things twice. (as often is the case when folks upgrade cams without thought for headsor jugs which maybe added later as they want morepower)

Bottom line is this...the more air and fuel you can make the motor flow, the better the power, and there's no better way to wake up a harley than performing a big bore upgrade. If you can float the numbers, get some real nice high performance heads and then increase the size of your bore to whatever you can handle. Smallerupgrades like the 95" kits for 88 motors, and 103/107" kits for the newer 96" motors will allow you to get the biggest bang for your dollar without having to haveto split cases and redo the bottom end. If you want to go all out, then youcan go to 103", 113", 117" and 124"Stroker Kits, but this will escalate your costs and increase down time as the entire engine gets torn down versus the top end only in the smaller B/B kits.

Everyone has their own unique requirements.Some want big horsepower, others want torque, and for some it's increased two up riding power for hills and heavy loads.I suggest analyzingyour riding styles and habits, researching the companies noted above, and reading many of the threads on this subject as available through the search links above. Once you've figured what you want, and what kind of budget you have to work with, you can then call the companies above to see what they can do for you and your bike. You can spend as little and 1200.00 to 1500.00 for some economy kits, 3000.00 to 4000.00 for some of the better kits with heads or head service, and from 5000.00 on up to 10,000.00if you really want to make some tire shredding power. I'm into my build for about 10K now, and there are many here that have spent more with some of the bigger kits, and like I said...it all depends on what you want.

Recapping your initial question about cams, you can add some cams now, but you'll be limited to a moderate cam that will work with your currentengine, and that will not make a

 

Glideman, and others. I had an '04 RKC with the 95" big bore and it was ok. Now I have an '07 SG with the 103". I like it, but want more power. Nothing to crazy. I still want it to be reliable. You guys have forgotten more then I know about these engines. However, with my current build my next logical step is head work. Would I need to replace the cams again if I have the heads worked on? Are the SE or CNC heads a good way to go? Or if I sent mine off, is there a lot of down time, or do you swap out and get cores?
Thanks.

 

mmollo. How how horses are you pushing with your current upgrades? I have everything you have minus the 103". How much did that run you and did the dealer do the work?

 

You can make some decent power with a 103", but heads are going to wake it up if they haven't been done before. You can send them in to be worked on, locally if you can find the right guy for porting, or to companies like GMR Performance who will work them over for you. You can stay with the cams you have, but if you want more poines and you have a 103", you could go SE 255's, a set of Andrews, S&S or Red Shifts around 550 to 575 lift. That would hook you up better. I have S&S 585 gear driven cams and mine rocks. What cams do you have now?

If you want less down time, buy a set of GMR Cast CNC Heads which are made by R&R. They run about 1300.00 a set and make some great power. Call Steve at GMR.

 

I don't know about the current horse power, bike only has 900 miles and I have not been on the dyno. I had the dealer install, ran about 2k.

 

My big bore kit came with SE 255's. I'll check out some of these companies about the head work. Thanks for the info.

 

..JIMS 120..costs about $7200..sell your 88 for a coupla grand and you get a nice motor for about $5200 or so...not counting labor.
Later