Originally Posted by roofeditor
I would choose the 204 but even then it would be with street ported heads and adjusted for optimum compression to get that cam to bite. And even then, for the cost of boring the cylinders for a 95" build (around $50 - $75/hole) and the SE cast flattops at $109 makes that decision a no-brainer.
I'm a little new to the site and I'm learning. The dealer obviously wants to do the 203 and stage II 95 kit. I was wondering what the difference was in the 203 VS 204?
While on the subject I noticed many threads recommending a 98 kit VS the Harley 95 kit. Is there an advantage other than 3 more inches which in theory might be 3 more HP?
As to street ported heads....what is that? Harley has some sort of ported high compression heads from the SE book. I have also looked at Dewey's and Zippers for heads.
As to optimum compression.....what is optimum?
We have a pretty popular builder in Florida http://www.cycle-rama.com/
which is about a 2 hour drive away.
Thanks for the reply. There are so many opinions on cams it's confusing.
First off, nw_guy4_fun is correct. Getting the new build tuned "properly" is half the battle. Find out from Cycle-Rama what their preference is.... our preference is the SE Race Tuner but it can be difficult to find someone that is good with it.
Now, if you are like everyone else, you want a good bump up in performance and no loss of reliability. Being that you have a bagger, you probably want really good torque down low and your probably have never and will never hit the rev limiter. Please correct me if these assumptions are incorrect.
The typical 203 build has a decent bottom end response(read that as okay but not as great as it could be) but the motor will start to lay down at around 4500-5000rpm, iirc. The 204 has a similar bottom end response but stays around a little bit longer than the 203 and makes better hp.
A good 203 build dyno sheethttp://www.latus-harley-davidson.com...mid=1307#M1307
An exceptional 204 build dyno sheethttp://www.latus-harley-davidson.com...4&mid=260#M260
A Andrews 26 cam dyno sheet http://www.latus-harley-davidson.com...4&mid=983#M983
My neighbors nicely tuned 37g build http://www.v-twinforum.com/forums/at...2&d=1142117847
There are certainly other cam choices that work well in baggers, it all depends on what you want.
With regard to the 98 vs 95, they would be pretty similar in performance with a slight edge to the 98 in potential. The difference is that the HD jugs are iron lined and retain heat. The 98" cylinders are Nikasil plated aluminum and run up to 20* cooler. That's a good thing.
Ported heads is a big topic and I won't go into all of the detail here except that a good porter, like the several we have on the site (Big Boyz, GMR, Dewey, Atwood) can take your '06 heads and clean them up from the casting process, improve the ports, equalize the combustion chambers and then mill the heads for the correct chamber volume for the cam that is chosen. Hard to get that from a catalog.
Optimum compression ratio is going to vary depending on the cam. Some examples would be 9.6-9.8:1 for the 37g, 9.2-9.4 on the 26g, you would need to work with whomever is doing the heads to get this correct for the chosen cam.
Again, it's really important that you get the whole system from intake to exhaust tip working together and finally, to get it tuned properly.
I do not know Cycle-Rama but in looking at their website, I see they build some winning drag bike motors. That's a good indication that they know how to make power and tune. I would investigate them and see what they know about reliable bagger power and what proven combinations they recommend.