Top end swap. 107 to 114.
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Cruiser
Joined: Sep 2023
Posts: 120
Likes: 49
From: Carthage, Nc
Top end swap. 107 to 114.
So this may be a stupid question. So I am having the 122 SE stage III put on my stock 114. My bike is a 2023 SG special with 3000 miles. My brother has a 2020 SG standard with I think 15,000 miles. What I am wondering is could I give him the parts from my 114 and he put it on his 107 making his motor a 114. Has anyone done this? Is it even possible? Sorry if it's a dumb question.
Last edited by 23StreetGlideSpecial; Aug 5, 2024 at 07:28 PM.
Stellar HDF Member
Joined: Aug 2020
Posts: 3,167
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From: College Station, TX
The cylinders should be ok but the pistons will not work with a 107 as the stroke is shorter. You could get a set of pistons for the 107 that matches the bore of the 114 cylinders, but there is no guarantee that the new pistons will be the same size as the original ones, meaning they might not fits the existing cylinder bore correctly. So if you go thet route, get an oversized set of pistons ad have the cylinder bored and fitted with the over sized pistons.
Paul
Paul
Road Warrior
Joined: Feb 2017
Posts: 1,522
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From: Saint Charles, Missouri
It would be quite and overbore to make the 107 into a 114 just by boring the jugs and using oversized pistons. The motor would have more high rpm performance than a stock 114, but not the low end torque of a stock 114 as the stroke is shorter.
Grand HDF Member
Joined: Jul 2007
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From: Bates County MO
107= 4 3/8" stroke x 3.937" bore @ 10:1 (good)
114= 4 1/2" stroke x 4.016" bore @ 10.5:1 (better)
If you used the 114 cylinders and pistons on a 107 engine, you would end up with a low compression 110.84" (111) powerplant.
111= 4 3/8" stroke x 4.016" bore @ 8.7:1 (slug)
114= 4 1/2" stroke x 4.016" bore @ 10.5:1 (better)
If you used the 114 cylinders and pistons on a 107 engine, you would end up with a low compression 110.84" (111) powerplant.
111= 4 3/8" stroke x 4.016" bore @ 8.7:1 (slug)
Seasoned HDF Member
Joined: Dec 2005
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From: poway
Stroke has nothing to do with TQ,, Displacement does..
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,861
Likes: 7,980
From: poway
107= 4 3/8" stroke x 3.937" bore @ 10:1 (good)
114= 4 1/2" stroke x 4.016" bore @ 10.5:1 (better)
If you used the 114 cylinders and pistons on a 107 engine, you would end up with a low compression 110.84" (111) powerplant.
111= 4 3/8" stroke x 4.016" bore @ 8.7:1 (slug)
114= 4 1/2" stroke x 4.016" bore @ 10.5:1 (better)
If you used the 114 cylinders and pistons on a 107 engine, you would end up with a low compression 110.84" (111) powerplant.
111= 4 3/8" stroke x 4.016" bore @ 8.7:1 (slug)
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Tourer
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From: Ontario
what do you think stroke gives you..
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Seasoned HDF Member
Joined: Dec 2005
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From: poway
So which has more tq? A long stoke 114 ci motor say 4.015 x 4.5 or 4.25 x 4. bore and stroke. Displacement is essentially the same..
Last edited by Max Headflow; Aug 6, 2024 at 11:11 AM. Reason: 4.5 not 4.375
6th Gear
Joined: Jun 2024
Posts: 10
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From: Kentucky
Many factors play into how an engine will perform when it comes to HP and Torque, but I'd say piston stroke is heavily related to torque.
Think about it like this, stroke is determined by the crank offset (crank centerline to connecting rod position). Larger offset will have a larger rotational stroke.
Now think about this offset like a wrench. A longer wrench (or stroke as it relates to engines) will apply more torque to the working end than if you used a shorter wrench, given the same input force to each.
A shorter wrench can be spun more quickly due to having a smaller radius (RPM), but torque is reduced.
Just my opinion....
Think about it like this, stroke is determined by the crank offset (crank centerline to connecting rod position). Larger offset will have a larger rotational stroke.
Now think about this offset like a wrench. A longer wrench (or stroke as it relates to engines) will apply more torque to the working end than if you used a shorter wrench, given the same input force to each.
A shorter wrench can be spun more quickly due to having a smaller radius (RPM), but torque is reduced.
Just my opinion....
