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Author Topic: My Quest To Hit the Ton  (Read 2253 times)

High On Octane

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My Quest To Hit the Ton
« on: February 09, 2014, 06:10:54 PM »
Now that I have to tear the primary cover off of the Blackhawk again, I decided that I'm going to replace the clutch plates/springs and counter-shaft sprocket while I'm in there playing.  So I decided to go ahead to play with the gearing spreadsheet and CeD/MPH/HP calculator.  With the way the engine is built and tuned, I'm guessing I have close to 45hp at the block.  I need 42hp to to hit 105mph, so I went with that figure.  I took all my magic numbers and started plugging them in and this is what I came up with.



All the important numbers are highlighted in red and yellow.  With the 21 tooth sprocket I should be able to cruise at 70mph at less than 4000 RPMs, which should make it much more capable of cruising down the Interstate without having to worry about getting killed by stupid cagers.  Also, I should be able to redline right around 107mph.  ;D  Best part is at normal 55mph speeds I'll putting cruising nicely at only 3000 RPMs.   8)

Scottie
Bulldog Kustoms - Denver, CO
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The Blackhawk
1958 Enfield/Indian 711cc Twin

Building The 1st Ever Ace Performance
Enfield Twin Full Race Heads

ace.cafe

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Re: My Quest To Hit the Ton
« Reply #1 on: February 13, 2014, 08:00:57 PM »
With a 19th sprocket, you should be able to hit the Ton at around 6000 rpm in top gear.
That's what it takes with the Fireball.
Anything over that is "gravy".
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barenekd

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Re: My Quest To Hit the Ton
« Reply #2 on: February 14, 2014, 11:08:56 PM »
I think I mentioned this, but the stock sprocket on that bike is a 21T. Road tests showed them easily capable of the ton.
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High On Octane

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Re: My Quest To Hit the Ton
« Reply #3 on: February 15, 2014, 01:54:02 PM »
"Factory" road tests indicated them hitting the ton.  Every "independent" road indicated a top speed of 94mph.  And my bike doesn't have a 21 tooth, it has an 18 tooth front, which is why I want to put a 21 tooth on it.  Constellations came with a 20 tooth, the Super Meteors only came with a 18.

Scottie J
Bulldog Kustoms - Denver, CO
Specializing In Kustom Paint

The Blackhawk
1958 Enfield/Indian 711cc Twin

Building The 1st Ever Ace Performance
Enfield Twin Full Race Heads

ace.cafe

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Re: My Quest To Hit the Ton
« Reply #4 on: February 15, 2014, 02:02:04 PM »
"Factory" road tests indicated them hitting the ton.  Every "independent" road indicated a top speed of 94mph.  And my bike doesn't have a 21 tooth, it has an 18 tooth front, which is why I want to put a 21 tooth on it.  Constellations came with a 20 tooth, the Super Meteors only came with a 18.

Scottie J

19 teeth works very well on the Bullet, which is very similar layout.
19T on the Fireball gives easy 75-80 mph cruising, and just tops the Ton. Still has good acceleration.
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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ERC

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Re: My Quest To Hit the Ton
« Reply #5 on: February 15, 2014, 02:27:04 PM »
With a 20 you might lose lower end. Most likely would give you a great top end. As Ace says a 19 might be safer for all around performance.  ERC
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High On Octane

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Re: My Quest To Hit the Ton
« Reply #6 on: February 15, 2014, 03:12:02 PM »
With a 20 you might lose lower end. Most likely would give you a great top end. As Ace says a 19 might be safer for all around performance.  ERC

I realize that small change in sprockets can have a significant difference, but I'm telling you this bike is way under geared.  I can get up to 75mph in about 8 seconds and then it takes about 3/4 of a mile to go from 75-90.  The motor pulls pretty damn hard all the way to that 75mph mark and then just starts losing steam.  And I should be putting out a bit more power than a stock 700cc twin as well, being the cylinders are punched +.040 and I have EI installed.  And if you look at the gear chart, you can see right now (18TF/46TR) that I'm damn near redlined at 90mph in 4th gear.  Only jumping to a 19TF will redline me below the ton, 6123 RPMs @ 100mph when the bike is barely good for 6K in current form.  I'm not too worried about sacrificing a little low end power, as when I'm playing in the dirt I'm usually creeping in 1st or 2nd gear anyways and the 20TF will give me a little more leeway for 1st gear fun.  If I'm on the street, chances are I'm cranking on it anyways.  ;D  I guess I'll go with a 20TF as it is good for just over The Ton and should still ease up my highway speeds.  This whole cruising at 4500 RPMs at 65 mph is no good.

Scottie J
Bulldog Kustoms - Denver, CO
Specializing In Kustom Paint

The Blackhawk
1958 Enfield/Indian 711cc Twin

Building The 1st Ever Ace Performance
Enfield Twin Full Race Heads

ace.cafe

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Re: My Quest To Hit the Ton
« Reply #7 on: February 15, 2014, 03:27:44 PM »
I realize that small change in sprockets can have a significant difference, but I'm telling you this bike is way under geared.  I can get up to 75mph in about 8 seconds and then it takes about 3/4 of a mile to go from 75-90.  The motor pulls pretty damn hard all the way to that 75mph mark and then just starts losing steam.  And I should be putting out a bit more power than a stock 700cc twin as well, being the cylinders are punched +.040 and I have EI installed.  And if you look at the gear chart, you can see right now (18TF/46TR) that I'm damn near redlined at 90mph in 4th gear.  Only jumping to a 19TF will redline me below the ton, 6123 RPMs @ 100mph when the bike is barely good for 6K in current form.  I'm not too worried about sacrificing a little low end power, as when I'm playing in the dirt I'm usually creeping in 1st or 2nd gear anyways and the 20TF will give me a little more leeway for 1st gear fun.  If I'm on the street, chances are I'm cranking on it anyways.  ;D  I guess I'll go with a 20TF as it is good for just over The Ton and should still ease up my highway speeds.  This whole cruising at 4500 RPMs at 65 mph is no good.

Scottie J

Oh! It's your 46T rear that's the problem.
Normal Enfield gearing is 38T rear.
Where did that 46T come from?
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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ERC

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Re: My Quest To Hit the Ton
« Reply #8 on: February 15, 2014, 04:03:30 PM »
I believe all the old twins came with 46 teeth.  ERC
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High On Octane

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Re: My Quest To Hit the Ton
« Reply #9 on: February 15, 2014, 04:33:52 PM »
I believe all the old twins came with 46 teeth.  ERC

Yep, I have the big ol' extra huge rear sprocket/drum assembly.  Honestly, when I found out the Bullets have a 38 tooth rear, the thought had crossed my mind to pick up an 18" Bullet rear wheel.  :)
Bulldog Kustoms - Denver, CO
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The Blackhawk
1958 Enfield/Indian 711cc Twin

Building The 1st Ever Ace Performance
Enfield Twin Full Race Heads

ace.cafe

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Re: My Quest To Hit the Ton
« Reply #10 on: February 15, 2014, 04:38:18 PM »
Okay, well the larger tooth sprocket like the 21 would be good then.
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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Bullet Whisperer

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Re: My Quest To Hit the Ton
« Reply #11 on: February 16, 2014, 08:58:39 AM »
I will check, as I am sure I have one lying around somewhere, but I think the twins have, or should have, a larger engine [crank] sprocket than the singles which will offset the effect of the larger 46t rear sprocket.
 B.W.

Bullet Whisperer

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Re: My Quest To Hit the Ton
« Reply #12 on: February 16, 2014, 09:56:52 AM »
Here is a picture of a 700 Meteor, that might help if you zoom in on the engine sprocket  ;)
 B.W.

ERC

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Re: My Quest To Hit the Ton
« Reply #13 on: February 16, 2014, 02:21:32 PM »
Bullet, I've got three in front of me and they all have 29 teeth. Don't know how many are on the bullet. Your right this could make a difference.   ERC
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ERC

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Re: My Quest To Hit the Ton
« Reply #14 on: February 16, 2014, 02:27:14 PM »
Just looked the Bullet one has 25 teeth.  ERC
2-57 Apaches, 2-57 Trailblazers, 60 Chief, 65 Interceptor, 2004 Bullet, 612 Bullet chopped.