Differences

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--- techtalk:ih:engmech01c [2018/09/08 02:20]
+++ techtalk:ih:engmech01c [2021/11/18 20:43]
hippysmack [Engine interchangeability]
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+[[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]]
+====== IH: Engine Mechanicals - Sub-01C ======
+====== Ironhead Engine Case Identification ======
+\\
+====== 1957-1971 Cases ======
+===== Short Frame vs Long Frame =====
+Short frame motors are 1957-1966 XL / XLH and 1958-1969 XLC / XLCH. \\
+Long frame motors are 1966-up XLH and 1970-up XLCH. \\
+All sportsters 1957-1966 were virtually identical in design. So most parts thru that period do interchange seamlessly. \\
+The differences that do exist are easy to deal your way around. \\
+The 1967-1969 CHs were also of part of that original design. \\
+The XLForum seems to have adopted the term 'short frame' to describe the 1st generation bikes. \\
+(because their frames were shorter than the 2nd generation "long frame" bikes that came into being to hold all the electric start stuff in 1967) \\
+-1969 XLH was not 1st generation design though many of these second generation parts will retro-fit to the 1st generation design bikes. \\
+Some don't make that an easy task as they are similar but not the same. ((Dr Dick of the XLFORUM DR DICK http://xlforum.net/forums/showpost.php?p=4673358&postcount=14)) \\
+===== Engine interchangeability =====
+-1969 XLCH are the same as the bikes that came before (short frame) but the 1967-1969 XLH are different (long frame). \\
+All 1970-up bikes used the long frame. \\
+From 1967-1969, there were two sportsters; Short XLCH and Long XLH. \\
+The electric start "hump" engines will bolt directly into kick only frames. \\
+What won't bolt on from there is the matching e-start accessories (oil tank or battery box). ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1780075)) \\
+The e-starter is well forward of the seat tubes. You may have to do a slight amount of clearancing for the aluminum starter housing. \\
+Or just run kick only and make it real simple. \\
+If swapping early motors into 1977-newer frames, just remember to use the front and rear mounts for the year the frame is. ((bobber58 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1857474&page=2)) \\
+To power the starter, a giant battery was required. \\
+To make room for this, the rear frame down tubes were offset to the rear with a "dogleg" and now the frame got longer than the original. \\
+The original is a "short frame" and the doglegged version is a "long frame". \\
+See the long frame (dogleg) in the pic below. Note the position of the down tubes to the motor mount surface. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1028933&page=2)) \\
+{{:techtalk:ih:body:1967_and_1971_seat_post_comparison_-_composite_of_pics_from_ebay_sellers_animalhouse2010_and_rusty_dusty_motorcycle_parts.jpg?direct&400|}} \\
+===== Short frame cases =====
+In 1952, the K model was introduced. This was a brand new design for HD. \\ Between 1952 and 1976, that basic bike slowly evolved. \\
+It was built on the same "mechanical DNA" and lots of stuff directly interchanges between a 1952 and 1976. \\
+In 1977, the basic design changed. Fitting a 1977 engine into a 1976 frame requires mods to the frame. \\
+The F model flatheads (side valve in factory speak), from 1952 to 1956, the bike changed each year. \\
+But the changes were evolutionary rather than revolutionary. You could pretty easily put 1956 stuff on your 1952 and vice versa. \\
+In 1957, the OHV XL came along. This new engine was fitted to the same basic frame. It was still the same bike for the most part. \\
+You could put the OHV engine in the flattie frame and vice versa. Same in 1958. Basically one bike so far. \\
+In 1958, the factory took that basic bike and introduced a new model along side the XLH, the XLCH. \\
+The XLCH is the same motor and frame and everything bolted on is just stripped down but still the same bike. \\
+These two models, linked at the hip, were produced until 1966. \\
+-1966 (all) and 1967-1969 (XLCH) are kick start only. \\
+The left picture below is a 1964 XLCH left case. It can be used on any short bike. \\
+Notice the 4 blue and 3 yellow circles drawn on the picture. \\
+On 1958-1969 XLC / XLCH, these are all tapped holes for the primary cover. \\
+On 1957-1966 XL / XLH, the holes at the yellow circles are not drilled or tapped and the holes at the blue circles are not tapped but have 3/16" dia roll pins. ((Dr Dick of the XLFORUM DR DICK http://xlforum.net/forums/showpost.php?p=4673358&postcount=14)) \\
+The right picture below is of a 1960 XLH left case. \\
+In this case you don't have all the screw holes needed for the tin primary cover used on 59-69 CH. \\
+You'd need to use the 3 hole sportster cover or pull the pins and drill and tap to convert to tin cover. \\
+Click on a pic to enlarge: \\
+|  Short frame left case for XLCH ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=4673358&postcount=14))  |  Short frame left case for XLH ((photo by sevenyears of famine of the XLFORUMM))  |
+|{{:techtalk:ih:engmech:1964_xlch_left_case_by_dr_dick.jpg?direct&400|}}|{{:techtalk:ih:engmech:1960_xlh_left_case_by_sevenyears_of_famine.jpg?direct&400|}}|
+|  Cases from a 1965 XLCH (short frame) ((photos courtesy of Ebay seller, chezyrydr. [[https://www.ebay.com/sch/chezyrydr/m.html?item=114957642341&rt=nc&nma=true&nordt=true&orig_cvip=true&si=zOYpPKkEiEnNnFiXOFT6Zq890Gs%253D&hash=item1ac4026a65%3Ag%3AToIAAOSwrtdhKV-y&vxp=mtr&_trksid=p2047675.l2562|Link to Items for Sale page]]  ))  ||
+|{{:techtalk:ih:engmech:1965_xlch_900_case_pic1_by_chezyrydr.jpg?direct&400|}}|{{:techtalk:ih:engmech:1965_xlch_900_case_pic2_by_chezyrydr.jpg?direct&400|}}|
+===== Long frame cases =====
+Then it happened. \\
+In 1967, a mutation in the DNA resulted in the 1st change away from the original design. \\
+Electric start was offered on XLH. A "hump" was added to the left case casting above the tranny. \\
+It was decided to put the electric starting components behind the rear cylinder mounted to the crankcase above the new case "hump". \\
+New (XLH only) "hump cases" with "long frames" were made to accept the new starter. \\
+The 1967-1969 XLCH was unaffected until it also succumbed in 1970. \\
+-1969 (XLH) and 1970-1976 (all) are electric and / or kick start. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1780075)) \\
+On long frames, mechanically speaking, 1967-1969 (XLH) and 1970-1971 (all) cases interchange. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1028933&page=2)) \\
+Cosmetically speaking, only 1967-1969 XLH cases are identical. \\
+====== 1972-1976 Cases ======
+====== 1977-1985 Cases ======
+\\
+[[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]]

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