Throttle response 114 vs 107
HDF Community Team
Joined: Sep 2013
Posts: 2,385
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From: Wisconsin
HD uses the same cam for the 107 and 114 - 25400190 - from what I can determine. Different air filters for the 107 vs 114 but likely the same exhaust by model. Seems to me that the 114 should have a different cam and tune to match the bore and stroke/displacement and I suspect the Stage II takes care of that according to HD's charts. A look at the factory maps for each engine would be interesting.
I've had a 107 Deluxe, a 114 Heritage, and now 114 Fat Bob. The Deluxe was smoother through the rpm range than either 114's, but the Fat Bob is smoother than the Heritage ever was especially as rpms go over 3000. From idle up the 114's pull well with no flat spots so far and the torque can be felt over the 107 especially if the throttle was left pretty much alone and the clutch just engaged as a test.
Last I checked the 107 and 114 use the same two balancers in the Softail line so maybe they're tuned for the 107 more than the 114's.
I've had a 107 Deluxe, a 114 Heritage, and now 114 Fat Bob. The Deluxe was smoother through the rpm range than either 114's, but the Fat Bob is smoother than the Heritage ever was especially as rpms go over 3000. From idle up the 114's pull well with no flat spots so far and the torque can be felt over the 107 especially if the throttle was left pretty much alone and the clutch just engaged as a test.
Last I checked the 107 and 114 use the same two balancers in the Softail line so maybe they're tuned for the 107 more than the 114's.
Last edited by Hulkss; Nov 23, 2019 at 04:49 PM.
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Joined: Aug 2006
Posts: 24,529
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From: Pennsylvania
Technical Stuff for those so inclined:
Milwaukee-Eight™ 107
Bore 3.937 in.
Stroke 4.375 in.
Displacement 107 cu in
Compression Ratio 10.0:1
Engine Torque 111.4 ft-lb
Engine Torque (rpm) 3,250
Milwaukee-Eight™ 114
Bore 4 in.
Stroke 4.5 in.
Displacement 114 cu in
Compression Ratio 10.5:1
Engine Torque 124 ft-lb
Engine Torque (rpm) 3,250
Milwaukee-Eight™ 107
Bore 3.937 in.
Stroke 4.375 in.
Displacement 107 cu in
Compression Ratio 10.0:1
Engine Torque 111.4 ft-lb
Engine Torque (rpm) 3,250
Milwaukee-Eight™ 114
Bore 4 in.
Stroke 4.5 in.
Displacement 114 cu in
Compression Ratio 10.5:1
Engine Torque 124 ft-lb
Engine Torque (rpm) 3,250
Last edited by CoolBreeze3646; Nov 23, 2019 at 04:46 PM.
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Joined: Sep 2015
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I meant to update the this thread, better late than ever!
I got the SE Tuner, and after loading Stage 1 tune and doing one full autotune session, the problem is completely solved. There is a night-and-day difference, for me anyway, in throttle progressivity off-idle, especially when cold. It is now exactly how I remember it from my 107. Just FYI for others that might have noticed the same thing.
I got the SE Tuner, and after loading Stage 1 tune and doing one full autotune session, the problem is completely solved. There is a night-and-day difference, for me anyway, in throttle progressivity off-idle, especially when cold. It is now exactly how I remember it from my 107. Just FYI for others that might have noticed the same thing.
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