The gear is frequently stamped with the opening and closing points of that cam.053 lift, although some have other figures that I cannot reconcile which may have been the month and year of manufacture.Compare this with KR cams which have very tall lobes (.375 to.440) but no rocker arms.To get a more realistic picture for comparison with other cams add 20 to any opening or closing value, or 40 to any duration.The inlet and exhaust ports will need modification and possibly even larger valves.
![]() Parts Stock Harley Take Offs Gear and Other Items For Sale Trades Freebies (See Subforums for specific models) Good Or Bad Shopping Experiences At HDF Regional Events, Rides and Road Reports National Events The Georgia Crew The Florida Crew Northeast Northeast Tri-State Area Southeast Great Lakes Pacific Pacific Northwest Southwest Mountain - Prairie Canada Europe Other Countries Memorial Forums In Memory Of. Harley Sportster Performance Cams Plus Extreme MeasuresGetting a stock EFI Sportster to wake the neighbors and clear the cobwebs, plus extreme measures for extreme horsepower. So pipes and an air cleaner will give you an effective boost. Once that thrill wears off, you can change the camshafts but after that it gets expensive as major engine modifications (often irreversible) will need to be done and reliability may suffer; although, it is your bike and your money, so read on and see where your budget and skill level can take you. EPA are obsessed with noise and emissions, so restrict air cleaner designs, muffled exhausts and very lean fuel settings that are in the way of unleashing the beast. These filters will allow the bike to ingest more air and it is the amount of air that gets burnt during the combustion stage of the running cycle that determines how much power the engine will produce. A 2-1 system or a set of aftermarket 2-2 exhausts will likely give more power, but you need to have experience of removing exhaust flange studs successfully. This is a bit of a science, but the basic rule for the setup described above is to add 15 to the main jet figure (eg 170 main jet 15 195), which even if it isnt spot-on, it will stop the bike from melting pistons while you adjust the settings. The best guide to determining whether the settings are correct can be found in the Mikuni HSR42 installation and tuning guide, they make it really easy to understand and the guide is downloadable from their website. This is a small computer that interferes with the signals coming from the ECU module to allow more fuel to flow into the engine at any given rev or load range. They come in various types and prices and either have downloadable maps or manually adjustable settings. Some are self-tuning in as much as you just fit them and they work out what the bike needs with no input from you or your laptop. Look for Rev Tech, Ultima, Cobra, Vance and Hines Fuel Pak and Power Commander. For EFI bikes, you will need to add a tuner and have the ECU Flashed at a dealership (they need the whole bike for this) before fitting the tuner, this will add 650 to 1,000 to your budget. The conversion kit is 1,050 including gaskets and fitting around 500; you will also need the tuner and possibly the ECU flash. Big breaths mean more air is burnt and that gives you more power; they also change when the bike breathes. For this level of upgrade, you should stick to a bolt-in camshaft; that means it can be fitted with no other mechanical modifications to the engine internals, but will still give you a radical increase in power. If you dont know what that means, then dont attempt the job yourself or buy the manual and read it thoroughly before deciding to attempt the job. These sort of modifications will increase the gains that the camshafts will give you. These can be obtained from Barnett or Screamin Eagle (28 DIY or 150 fitted) and will need a special tool made, bought or borrowed to do the job. They give a reasonably even spread of power and more of everything, mostly right where you want it. Im talking about some seriously hot camshafts that are designed to give huge amounts of power and this means that your valve gear will have to be extensively modified, so that the valves stay out of the way of the pistons when the engine is running.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |