The advance curve is extremely slow and much power and torque goes out the tailpipe.Anybody running aftermarket cams in their 2004 OR LATER sportster If so, whatcha got Wondering if anybodys got tales of glory or woe to sway me in a direction.Would like to run N8s, but not sure about clearance issues.Thoughts.
I cant help you, but I thought I would come shit in your thread, and remind you that we Scotts are better than you pasty Irish bastards. Seriously, someone has to have an answer for Threat357, hes an awesome dude. This thread got no replies, but a thread about a biltwell denim vest got 17 PAGES of replies. Lame. Hipsters. Sent from my DROIDX using Tapatalk 2. Probably need some headwork for a hotter cam to be very effective though. I know anything with a lift over.500 is overkill for me cuz I want more lowmid balls than high rpm. Im not drag racing a foot clutch jockey shift sportster through Vegas traffic (at least not unless Im evading the police) I appreciate the info fellas. You wont see quite the same gains, but there wont be any clearance issues and you also wont be spending 700 to get your heads cleaned up, so theres that. This is NOT my opinion so I really cant help you if you have any questions. I did try to look at the pics this guy is referencing but they force you to register and I have no need to join another forum. Gigem, The Andrews N8 cams are a fine choice, even with the reverse dome pistons. They are ground on the same base circle as the stock cams and are a direct bolt in. Stock springs are OK if you are not going to live much above 6000 rpm. ![]() With the heads, I prefer to port the 883 head rather than use the 1200 head. Reasons 1. The 883 combustion chamber is shallower and smaller. The valve seats are the same OD as the 1200 making the installation of larger valves, moving the seats out, and boring the throats a snap. The short side radius, in the port, is longer giving the air room to straighten out before you have to bend it again around the valve head. Sportster W Cams Full Circumference OfThe 883 head in a 1200 bore will leave you with a.400 squish band around the full circumference of the combustion chamber making the head more efficient, less sensitive to fuel quality, and less tendency to detonate. I have never been able to pull the air through a ported 1200 head that I can through a ported 883 head with the same size valves as the 1200. A stock 883 head flows 99 to 101 cu ft min on the intake at 10 H2O.500 lift. A stock 1200 around 117 10 If I remember correctly. My ported 883 heads avg 135 10 I recently flow tested a new set of stock Thunderstorm heads and they flowed 135 10.500 lift. I did not have opportunity to cc the head.the combustion chamber appeared to be quite large which would really lower the compression with reverse dome pistons, depending on what the reverse dome volume is. I know a decade or more back, Jerry Branch, of Branch Flowmetrics, built a 1200, 8.5 to 1 compression engine that produced 95 hp with V4(N4) cams. He was, however, using a 1.940 intake and turning the engine 7500 rpm. There is a pic of the big valve 883 heads in my photo gallery if interested. If the heads are flowing well, you can make 70 hp with the stock cams and 80 with the N8s. My recommendations In the following order. If the carb has not been kitted, do it. The 883 ignition is the single sorriest ignition Harley ever forced on the public.
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