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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
By putting this 110" bolt on kit with a set of more aggressive cams and such on a 96-103" bike without the proper crank work, can you say KABOOM? Might as well go to a 120" or bigger.
(copied from that item description)
-----Fits 50-state ’11-later Dyna® FXD, FXDB and FXDC models equipped with Shorty Dual Exhaust. Installation requires separate purchase of Muffler P/N 64895-09 (Qty 2). Also fits 50-state ’10-later FXDF and FXDWG models. FXDF and FXDWG models requires separate purchase of Mufflers P/N 65884-09 and 65886-09. All Dyna® models require separate purchase of Screamin’ Eagle high flow cleaner. ’10-’11 Dyna® models require ACR Harness P/N 70623-06. Does not fit models with engine cases that have been machined to accept large-bore cylinders. Also fits 50-state ’11-later Softail® models (except FLS, FLSS, FLSTFBS, FLSTN, FLSTSB, CVO™ 110 models or models with engine cases that have been machined to accept large-bore cylinders.). Requires separate purchase of Screamin’ Eagle high flow air cleaner. ’11 Softail® models require ACR Harness P/N 70623-11.------
Little confusing wording, but sounds like some models need cases bored, some don't..... My guess is all do... But I don't know.
My understanding of cubic inches is you only get more with larger bore and Pistons, OR, longer stroke. Longer stroke cannot be obtained without crankshaft work, so bigger jugs and bigger pistons is all this is talking about.
Again, my understanding of the stock HD cases was 107 was the largest possible without case boring....
In order to yeild 110", on top of the 4 3/8" stroke, it has to be a 4" piston.
NO WAY, SHAPE, OR FORM can that be done w/o boring the cases, regardless what is said in that advertisement.
3.937" bore is the limit, at 107".
Scott
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