A and B?
Road Captain
Joined: Sep 2005
Posts: 583
Likes: 5
From: Maine
RE: A and B?
Technically there is no "A" engine only TC88 and TC88B and as of '07, TC96 and TC96B. As mentioned the "B" engine is a balanced engine. The "B" engine is only available in softail frames. The Touring and Dyna chassis all use TC88 or TC96 rubber mount engines.
Road Captain
Joined: Sep 2005
Posts: 583
Likes: 5
From: Maine
RE: A and B?
ORIGINAL: Z
Also, I understand that the B motor redlines 1,000 revs lower than the non-B motor. Not sure of this though.
Also, I understand that the B motor redlines 1,000 revs lower than the non-B motor. Not sure of this though.
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Road Captain
Joined: Sep 2006
Posts: 543
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From:
RE: A and B?
The "B" is for a BALANCE SHAFT. It doesn't mean the engine is balanced like a race engine to within .5 gram.
The balance shaft is a 1/2 order cancelling device. It runs off of the crankshaft and rotates opposite cancelling out the normal vibrations of a twin cylinder engine in the case of the HD.
A lot of engines have balance shafts...2.4L Mopar, 1000cc Arctic Cat, 3.8L FWD Taurus and Windstars, lots of Japanese cars, etc.
B engines have a rev limit because the shaft would leave the crankcase.
I almost went with a 07 Softail Custom because of the B engine, but I love the DWG to much. The rubber mount has it's negative too, but the future for my bike is brighter without a balance shaft.
The balance shaft is a 1/2 order cancelling device. It runs off of the crankshaft and rotates opposite cancelling out the normal vibrations of a twin cylinder engine in the case of the HD.
A lot of engines have balance shafts...2.4L Mopar, 1000cc Arctic Cat, 3.8L FWD Taurus and Windstars, lots of Japanese cars, etc.
B engines have a rev limit because the shaft would leave the crankcase.
I almost went with a 07 Softail Custom because of the B engine, but I love the DWG to much. The rubber mount has it's negative too, but the future for my bike is brighter without a balance shaft.
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Road Warrior
Joined: Oct 2006
Posts: 1,916
Likes: 0
From: San Antonio, Texas
RE: A and B?
So that explains why my left grip and mirror jumps up and down at stoplights on my WG 
I love the vibes though - that's why I love Harleys so much - they are "alive" and not just an electric buzz...
I love the vibes though - that's why I love Harleys so much - they are "alive" and not just an electric buzz...
Cruiser
Joined: May 2006
Posts: 138
Likes: 0
RE: A and B?
I always knew the balanced and rubber mounted part of the difference, but on the harley website the dynas, softails and baggers all have different torque numbers. Are all three just tweaked a little different or something?