88" crank in a 96"block
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Tourer
Joined: Nov 2007
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88" crank in a 96"block
I recently had a complete motor rebuild and I noticed that the new crank has the non taperd connecting rods. Is it possible to use a crank out of an 88 and use it in a 96" block? I have been wondering about this since the build. This would explain why the bike doesn't feel as powerful. Any comment's?
Cruiser
Joined: Dec 2008
Posts: 223
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From: South East
The non tapered rods are an upgrade done while rebuilding the crank. The 88 crank is different on the output side anyway. It has course splines and a male thread. The 96 crank has fine splines and a tapped hole on the output side.
Road Master
Joined: Jun 2008
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From: Trenton,N.J.
I recently had a complete motor rebuild and I noticed that the new crank has the non taperd connecting rods. Is it possible to use a crank out of an 88 and use it in a 96" block? I have been wondering about this since the build. This would explain why the bike doesn't feel as powerful. Any comment's?
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
As was explained in the same post in the Engine section; it is possible but your compensator/stator assembly would not have fit. Looks like the builder did you a favor and installed rods from a TC88. The 88" rods and the 96" rods are the same length. The additional stroke comed from re-locating the crank pin in the wheels by .1875". The rods are not the problem on why the motor is down on power.
Outstanding HDF Member
Joined: Dec 2008
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From: Phoenix
I recently had a complete motor rebuild and I noticed that the new crank has the non taperd connecting rods. Is it possible to use a crank out of an 88 and use it in a 96" block? I have been wondering about this since the build. This would explain why the bike doesn't feel as powerful. Any comment's?
Outstanding HDF Member
Joined: Dec 2008
Posts: 2,182
Likes: 0
From: Phoenix
As was explained in the same post in the Engine section; it is possible but your compensator/stator assembly would not have fit. Looks like the builder did you a favor and installed rods from a TC88. The 88" rods and the 96" rods are the same length. The additional stroke comed from re-locating the crank pin in the wheels by .1875". The rods are not the problem on why the motor is down on power.
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Tourer
Joined: Nov 2007
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Yes, that's what I was thinking. And I say that because the bike ran like a scalded dog before, and now it run's ok but not like before. The compression seem's to be way down, and I say this because I can now run 89 octane without pinging. Next tank will be 87 octane, just to see if it pings. I also forgot to metion that I have a t-max auto tune and since the rebuild I have gone through 10 +degree's of timing and still can't get it to ping. I know that pinging is not good, but I am trying to find the sweet spot in the timing and with a 10+ degree change I thought I would have been there by now.
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Tourer
Joined: Nov 2007
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Yes, Only the new crank rod's installed in my bike are not taperd. From what I've researched the tapered are from 07 and up. From what I can tell the 06 and down to whatever are not tapered. That's what's in my 07 bike right now, no taper.
Last edited by vbx07; Sep 28, 2011 at 03:08 PM.
HDF Community Team
Joined: Jun 2006
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From: san antonio
Absolutely the crank pin location; rods are both 7.667".