Maximum HP and torque?
Elite HDF Member
Joined: Sep 2007
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From: Nuevo México, Los Estados Unidos de América
If all you want are big numbers, and that feel, then what you've got works.
Most people equate big numbers with big performance though. 116 hp @ 5500 rpm doesn't make a particularly quick bike (outside of air-cooled HD and HD knockoff land).
I can't remember where I got the 9000rpm number. But I know people who are tuned/built to make power up to 7000rpm, which is what I was suggesting.
Club Member
Joined: May 2006
Posts: 14,564
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From: the 50s & the 60s
Most people who like the Harley "feel" like the feel of long-stoke engines matched with tall gearing.
If all you want are big numbers, and that feel, then what you've got works.
Most people equate big numbers with big performance though. 116 hp @ 5500 rpm doesn't make a particularly quick bike (outside of air-cooled HD and HD knockoff land).
I can't remember where I got the 9000rpm number. But I know people who are tuned/built to make power up to 7000rpm, which is what I was suggesting.
If all you want are big numbers, and that feel, then what you've got works.
Most people equate big numbers with big performance though. 116 hp @ 5500 rpm doesn't make a particularly quick bike (outside of air-cooled HD and HD knockoff land).
I can't remember where I got the 9000rpm number. But I know people who are tuned/built to make power up to 7000rpm, which is what I was suggesting.
Well I gotta say you win as a master of spin.
and, as to the 9000 #,
You throw this out, then forget.
I've never heard of that, but I sure would be interested.
mud
Elite HDF Member
Joined: Sep 2007
Posts: 4,541
Likes: 1
From: Nuevo México, Los Estados Unidos de América
It was an HD tech at the dealer, I remember now. Said the A model Twin Cams could run up to 9000 without falling apart (maybe not long term). Like I said, 7000 is reasonable, and I know a few.
What am I spinning?
What am I spinning?
Club Member
Joined: May 2006
Posts: 14,564
Likes: 9,223
From: the 50s & the 60s
What a joke.
I would even settle for a link to an 8000 RPM built FatHead.
mud
Elite HDF Member
Joined: Sep 2007
Posts: 4,541
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From: Nuevo México, Los Estados Unidos de América
Is there a point?
You don't believe it's possible?
What follows from that? I can assure you, with the proper modifications, it's at least possible for a short period of time. But I'm not sure what you're getting at.
The bottom line is, if you want a quick Twin-Cam, you should not increase the stroke, rather, move the dimensions toward squaring the bore and stroke, and pick cams and other components that function well at a high-rpm. Then, gear the bike down.
You don't believe it's possible?
What follows from that? I can assure you, with the proper modifications, it's at least possible for a short period of time. But I'm not sure what you're getting at.
The bottom line is, if you want a quick Twin-Cam, you should not increase the stroke, rather, move the dimensions toward squaring the bore and stroke, and pick cams and other components that function well at a high-rpm. Then, gear the bike down.
Elite HDF Member
Joined: Apr 2007
Posts: 4,919
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From: Seattle, WA
Here's a question:
The following table shows a comparison of 96 and 88 with same Big Bore kit and then with putting the Max SE jugs available through the MoCo on an 88 ... would give same CID as 96 with the Big Bore kit, but with less damage to the cylinders at the same RPM--presumably allowing for a longer lasting hi-output motor. Does this make sense?
Bore Stroke CID
Twin Cam 96 3.750 4.375 96.641
Big Bore 96 to 103 3.875 4.375 103.191
Twin Cam 88 3.750 4.000 88.358
Big Bore 88 to 95 3.875 4.000 94.346
Max H-D Jugs with TC 88 Stroke 4.060 4.000 103.570
The following table shows a comparison of 96 and 88 with same Big Bore kit and then with putting the Max SE jugs available through the MoCo on an 88 ... would give same CID as 96 with the Big Bore kit, but with less damage to the cylinders at the same RPM--presumably allowing for a longer lasting hi-output motor. Does this make sense?
Bore Stroke CID
Twin Cam 96 3.750 4.375 96.641
Big Bore 96 to 103 3.875 4.375 103.191
Twin Cam 88 3.750 4.000 88.358
Big Bore 88 to 95 3.875 4.000 94.346
Max H-D Jugs with TC 88 Stroke 4.060 4.000 103.570
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Tourer
Joined: Feb 2008
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I wouldn't mind a evolving my bike into a snappy canyon-carver. I don't cruise when I'm out riding. I ride very aggressive and like to hit the mountains as much as possible. I guess if I had to try and equate my vision to a car, it would be a late 60's ponycar style of bike. Not really muscle car but the sportscar racing series. That probably sounds lame but that's what I envision in a motorcycle.
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