mating 2 different engine cases
#1
10-09-2018, 02:08 PM
Join Date: Oct 2018
Location: east bay
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#2
10-09-2018, 02:15 PM
Road Master
its been done -- if you decide to do it your gonna have to have the cylinder decks checked for flatness - areas like the engine mounts - the alignment of the pinion and sprocket shafts - theres 3 guys on here who have done a ton of stuff like this -- raceprez-- johnjzjz and twisted -- best to either ask them or if serious send them the cases to have any alignment or milling of surfaces done -- also your gonna have different numbers on the cases --
#3
10-09-2018, 03:14 PM
Seasoned HDF Member
#4
10-09-2018, 05:37 PM
Road Master
#5
10-09-2018, 05:38 PM
Road Master
#6
10-09-2018, 05:47 PM
Seasoned HDF Member
u- yes you can But 3 spots are in question for machining
one - the deck can become un even we deck them flat the same amount both sides --
2 - the spicket hole in the block top may not be round and the jugs wont fit in sometimes
3 - the case will need to be line honed do the main bearing left side is in align with the right side pinion
4 - you will need some finesse in flywheel assembly and truing as the 78 is an 80 inch end oiler and the flat side shovel 74 inch engine is a side oiler - one early and one late flywheel wont work you need the early wheels as the strokes are different ( they do make a special shafts for this mod ) - as well as the oil pump needs to retain the side oiling unless you mod the block for the oiling system, up date to the later oil pump - then to keep your jugs if yours now are say .010 you need .070 over 74 inch pistons as the 80 inch pistons don't work as some think -- the strokes are different in the 2 engines But T&O makes 80 inch early bolt in wheels just so you know
this is not for a novis to attempt to do blending early and late engines -- does and is done still today but you need to really know what your doing to accomplish it
one - the deck can become un even we deck them flat the same amount both sides --
2 - the spicket hole in the block top may not be round and the jugs wont fit in sometimes
3 - the case will need to be line honed do the main bearing left side is in align with the right side pinion
4 - you will need some finesse in flywheel assembly and truing as the 78 is an 80 inch end oiler and the flat side shovel 74 inch engine is a side oiler - one early and one late flywheel wont work you need the early wheels as the strokes are different ( they do make a special shafts for this mod ) - as well as the oil pump needs to retain the side oiling unless you mod the block for the oiling system, up date to the later oil pump - then to keep your jugs if yours now are say .010 you need .070 over 74 inch pistons as the 80 inch pistons don't work as some think -- the strokes are different in the 2 engines But T&O makes 80 inch early bolt in wheels just so you know
this is not for a novis to attempt to do blending early and late engines -- does and is done still today but you need to really know what your doing to accomplish it
Last edited by johnjzjz; 10-09-2018 at 05:48 PM.
#7
10-09-2018, 08:02 PM
Seasoned HDF Member
Never did that one... don't see a need...while I thought the Output shaft was different on the pre Cone Motor.... i do not remember, as I simply put the stuff together as it is Supposed to be... my Partner would be the "go to" guty on this one... I have a hard enough time putting mismatched Cone motor Cases together...
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#8
10-09-2018, 08:47 PM
Seasoned HDF Member
Never did that one... don't see a need...while I thought the Output shaft was different on the pre Cone Motor.... i do not remember, as I simply put the stuff together as it is Supposed to be... my Partner would be the "go to" guty on this one... I have a hard enough time putting mismatched Cone motor Cases together...
#9
10-10-2018, 06:39 AM
Seasoned HDF Member
#10
10-10-2018, 03:55 PM
Seasoned HDF Member
