User opinion is about 90%+ for the releases so I have those coming. The local head porter (Mountain Cycle Performance) advised me to stick to stock valve sizes for my riding style. Just a rough idea with Big Boyz calculator/my altitude shows 9.85:1 static, 9.29:1 corrected and 187 ccp. Gonna be awhile but very interesting...

 

Hi Stoood, Hey I have a 2009 Tri-glide. We put in a HQ-0034 and it appears to be very similar to the SE-204. Did you ck out the HQ-0034 (Same as the HQ-TC-500).
the specs on the SE-204 are: Int 22/34 Exh 52/08 236/240 .508/.508
HQ-0034 Int 20/36 Exh 51/19 236/250 .500/.500. Are these almost the same? Let me know cause you probably know more than I do regarding these cams. Thanks for any help.
diesel

 

Most of my knowledge on cam physcs came from HD's books and websites. One very good site is "http://www.harley-riders-guide.com/harley-davidson-performance.html", Just clck on "Cams". - I did contact Head Quarters about a cam for my trike. Their Tech. Kevin, recommended their TC-HQ-575, Intake 20/40 240 .575" .161, "Exhaust 52/24 256 .530" .188" . I didn't use it for 2 reasons, first, I avoid lifts much above 0.550, as many builders have told me that the steep ramped, hgher lift cams don't contribute to 100,000 mile longevity . As I built the trike for some serious traveling, I kept things mild in view of this (I'm sure many will disagree, but I'm conservative). Also, the intake closing at 40 degrees would work out to a power band of around 2000 to 5000. Not bad, but I wanted power well into the teens as I gross at over a TON with my camper. As for the 0034 cams, I'm anxous to see how you like them (and a Dyno if possible). With intakes opening a bit later at 20 degrees, there'd be less tendency to ping (should tune up nice on the Dyno), and w/ its closing at 36, you should have good, tractable power at 1600 to 1700 (or close to that). With 10 deg. more exhaust duration, plus their closing 11 degrees later, you should have better high end, and be able to use higher back-pressure (quieter) mufflers, with he same output.There's more overlap (39 deg. vs. 30 on the SE204's), which can move torque up the Rpm range, but can also improve scavenging if done correctly, we'll see! My 204's were a bit bumpy at 1400, but smooth by 1800 and pulling strong. I did run into a snag, which the tuner now agrees was due to my pipes. I had NO usable power above 4100 or so due to a reversion issue. I would have lived with it, but the dealer had told me that Comp. releases were NOT needed, but I had serous hot starting issues w/the 9.85 to one flat top HD 103 bore kit, so I switched to S&S Easy Start 551's in the interest of hitting the road w/out further delay. I'm sold on them, nice HP/Torque curve (over 80 Ft. Lbs shortly off idle, wth 90 to 93 lbs from 2100 to 4100, and a good HP band up thru 5000 Rpm). The Dyno at HD Dubuque is new (it fits Trikes), and they suspect that it reads approx. 10% low, so my indicated 75Hp/93.5Tq would equate to around 82/103, closer to S&S's posted numbers for their 551's (but who cares???). They start SO easily, and have SO much low end torque that I can idle down main street at 1200 Rpm w/out jerking or stalling! Hit it, and there's NO hesitation, it RIPS! Now broken in, max cruse appears to be 95 MPH w/out overheating, not bad for a TON, and 35 MPG. Oh, I'm running Bub 7 Stealth, 1.75 nch ID inlet , 80 dB, 50 State legal mufflers, and it's so whisper quiet, that speedng is a real problem. Nice rig now, S. Carolina's on the map for next month. - Hope your build turns out well, please let me know! Ride Safe,
-Stoood

 

i just dropped my 2013 roadglide ultra off at the dealer today for the 204 cams, screamin eagle 1.725 rockers and better rocker support. my build will be 10.00 to 1 ratio, and it should be just fine. i'm using a V&H 2 into 1 pro pipe and the factory c&c ported heads with this build and the se air cleaner with the zippers deeper element. that should make for a strong runner. blending the intake manifold also just to match the throttle body properly. i liked the 259-e cams in the last build, but the 204's seem to pull stronger throughout the usable rev range. they kept trying to sell me the 255's, and they start out with great torque numbers, but fall off quick at around 3500 rpm's. i'm old enough to be a grandpa, but certainly don't ride like one. i want all the power possible, not just from idle to 4k rpm's, so the 255's weren't on my recipe for this build. they surprise me at the dealerships in that they "assume" to know what i want in my build. hell i didn't hire a g'damm psychic, so how the hell do they know what i want? this customer knows exactly what parts he wants in his motor, so i went through another dealership to get it done my way. as far as the 204's being the flavor of the month, it seems that for the past few years they've been really pushing the 255's. if you look at the charts, the 204's clearly have an overall advantage as to the amount of area below the curve. i'm excited to see how well my new motor pulls.