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Old 08-15-2009, 06:30 PM   #1 (permalink)
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124" Bore & Stroke?

What is the bore & stroke for 124",117",113",110", 96"?
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Old 08-15-2009, 07:32 PM   #2 (permalink)
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Cube = Bore x Stroke
124 = 4.125 x 4.625
120 = 4.125 x 4.500
117 = 4.125 x 4.375
113 = 4.060 x 4.375
110 = 4.000 x 4.375
107 = 3.937 x 4.375 (106.5)
103 = 3.875 x 4.375
96 = 3.750 x 4.375
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Old 08-15-2009, 09:03 PM   #3 (permalink)
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120= 4.065 x 4.625 as well
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Old 08-16-2009, 06:55 AM   #4 (permalink)
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True. There's a couple of ways to get the cubes for some given inch classes. 124 = 4.250 x 4.375 also (Axtell kit).

For the earlier engines, the 107 all bore: 4.125x 4.000 and so on.
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Old 08-16-2009, 07:21 AM   #5 (permalink)
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claydbal is reading this now saying WTF is this?
what was the old 116?

and dont forget the 4 .00 stroke x 4.250 bore 114
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Old 08-16-2009, 07:34 AM   #6 (permalink)
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Quote:
Originally Posted by HerkoBagger View Post
Cube = Bore x Stroke
124 = 4.125 x 4.625
120 = 4.125 x 4.500
117 = 4.125 x 4.375
113 = 4.060 x 4.375
110 = 4.000 x 4.375
107 = 3.937 x 4.375 (106.5)
103 = 3.875 x 4.375
96 = 3.750 x 4.375
Just a small taste of the bore stroke combinations out there.Then throw in different length rods,all shapes and sizes of pistons.Now lets move onto the cylinder heads.Trying to decide on a good combination? Have fun,Oh,Good Luck.
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Old 08-16-2009, 01:56 PM   #7 (permalink)
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If you take 2 engines both with the same ci's, 1 with a longer stroke and smaller bore an another with a shorter stroke and larger bore which will have a longer life and which will make more power?
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Old 08-16-2009, 02:08 PM   #8 (permalink)
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Quote:
Originally Posted by whetsel.m View Post
If you take 2 engines both with the same ci's, 1 with a longer stroke and smaller bore an another with a shorter stroke and larger bore which will have a longer life and which will make more power?
No expert here,but from engines I had built,A longer stroke usually translates into more tq,but it doesn have some drawbacks.Ex.you do loose some reliability & longevity.At least that's how it's been with my expierence!!!
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Old 08-16-2009, 02:08 PM   #9 (permalink)
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By Big Boyz cal my 117 has the same stroke as a 124 but the 124 has a bigger bore
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Old 08-16-2009, 02:59 PM   #10 (permalink)
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2 ways to get to 124 ci.
4.125 x 4.625
4.25 x 4.375
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Old 08-17-2009, 08:20 AM   #11 (permalink)
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Originally Posted by C-Cat View Post
2 ways to get to 124 ci.
4.125 x 4.625
4.25 x 4.375
Carl,
I think the folks in Americus, Georgia, chase it down differently yet, with their 126" powerplants.
Scott
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Old 08-17-2009, 09:54 AM   #12 (permalink)
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Quote:
Originally Posted by whetsel.m View Post
If you take 2 engines both with the same ci's, 1 with a longer stroke and smaller bore an another with a shorter stroke and larger bore which will have a longer life and which will make more power?
Longer life? It depends, because there are so many variables. But strictly speaking, in a controlled lab environment, if you were to run 2 engines of identical displacement, but different bore/stroke ratios, at say 3,000rpm forever, the shorter stroke engine would last longer simply due to its lower piston speeds. But we don't ride in a lab. Have you ever seen any over square crotch rocket engine with 100,000 miles on it? I doubt it. Power up to 11,000rpm, and the rider is going to use it. Now you have the same piston speed issues as a stroker, as well as valve train wear. If that crotch rocket engine never went above 5,000rpm, it would last well over 100,000 miles. But what fun is that?
Now with a Harley stroker, you have increased piston speeds, and you "usually" have more torque down low, and you're going to use it, "because it's fun". So you are beating up your crank at the low end, and wearing out your piston/cylinder faster on the top end. That's why H-D strokers have a history of not lasting as long. If you sat at 3,000rpm all the time, it would last a heck of a lot longer. But what "fun" is that?
I said "usually" more torque down low for a stroker, and have to clarify that. Stroke length has nothing to do with torque output. Torque is entirely a function of displacement and volumetric efficiency. Take 2 engines with equal displacement, but different bore/stroke ratios. If you run them at 3,000rpm, and they both are running at 100% VE, they are both going to have the same torque output. So why does a stroker appear to have more torque? Because you set up the engine around its limitations. It can't rev as high as a similar displacement engine with a shorter stroke, so you choose a cam that works within a stroker's narrower rpm band.
This moves the curve to the left. Also, looking at 2 engines with equal displacement, the stroker will have a smaller bore, which puts a limit on maximum valve size. In other words, the larger bore, shorter stroke engine has room for bigger valves. So smaller valves usually equals higher port velocities for a given rpm, which again shifts the curve to the left.
Which one makes more power? Well, HP is a function of rpm, and a shorter stroke can rev higher and utilize bigger valves, so a shorter stroke engine has the ingredients to make more HP. Real world example: the G2 engines.
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Old 08-17-2009, 12:22 PM   #13 (permalink)
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Originally Posted by claydbal View Post
what was the old 116?

and dont forget the 4 .00 stroke x 4.250 bore 114
4 x 4-5/8" was what I always used.
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Old 08-17-2009, 01:51 PM   #14 (permalink)
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Quote:
Originally Posted by skidmark316 View Post
Longer life? It depends, because there are so many variables. But strictly speaking, in a controlled lab environment, if you were to run 2 engines of identical displacement, but different bore/stroke ratios, at say 3,000rpm forever, the shorter stroke engine would last longer simply due to its lower piston speeds. But we don't ride in a lab. Have you ever seen any over square crotch rocket engine with 100,000 miles on it? I doubt it. Power up to 11,000rpm, and the rider is going to use it. Now you have the same piston speed issues as a stroker, as well as valve train wear. If that crotch rocket engine never went above 5,000rpm, it would last well over 100,000 miles. But what fun is that?
Now with a Harley stroker, you have increased piston speeds, and you "usually" have more torque down low, and you're going to use it, "because it's fun". So you are beating up your crank at the low end, and wearing out your piston/cylinder faster on the top end. That's why H-D strokers have a history of not lasting as long. If you sat at 3,000rpm all the time, it would last a heck of a lot longer. But what "fun" is that?
I said "usually" more torque down low for a stroker, and have to clarify that. Stroke length has nothing to do with torque output. Torque is entirely a function of displacement and volumetric efficiency. Take 2 engines with equal displacement, but different bore/stroke ratios. If you run them at 3,000rpm, and they both are running at 100% VE, they are both going to have the same torque output. So why does a stroker appear to have more torque? Because you set up the engine around its limitations. It can't rev as high as a similar displacement engine with a shorter stroke, so you choose a cam that works within a stroker's narrower rpm band.
This moves the curve to the left. Also, looking at 2 engines with equal displacement, the stroker will have a smaller bore, which puts a limit on maximum valve size. In other words, the larger bore, shorter stroke engine has room for bigger valves. So smaller valves usually equals higher port velocities for a given rpm, which again shifts the curve to the left.
Which one makes more power? Well, HP is a function of rpm, and a shorter stroke can rev higher and utilize bigger valves, so a shorter stroke engine has the ingredients to make more HP. Real world example: the G2 engines.
Very interesting!!!
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2010 Ultra Classic Hot Rod Built & Tuned by JD's
BB & Baisley Hybrid Heads with man/Comp releases
Axtell Pistons & Cylinders set with high comp,Big CCP
Darkhorse Stroker Crank,balanced,plugged & welded
Woods A/C kit & Lifters
T-Man gear crank set
High Flow HPI Inj & BB TBW Throttle body
D&D Boarzilla (perforated baffle)
Lenale cooling fan
Jagg 10 row oil cooler
K&P engineering oil filter
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Old 08-18-2009, 01:16 PM   #15 (permalink)
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Quote:
Originally Posted by skidmark316 View Post
.
Also, looking at 2 engines with equal displacement, the stroker will have a smaller bore, which puts a limit on maximum valve size. In other words, the larger bore, shorter stroke engine has room for bigger valves. So smaller valves usually equals higher port velocities for a given rpm, which again shifts the curve to the left.
Which one makes more power? Well, HP is a function of rpm, and a shorter stroke can rev higher and utilize bigger valves, so a shorter stroke engine has the ingredients to make more HP. Real world example: the G2 engines.
Well said Skid-
My G2 126" motor makes quite a bit more more hp per cube on pump gas than my 124 did-Which I expected.
What suprised me was the torque-I never thought I would also see 150 ft lbs at 10.5-1 out of my 126". My 124 needed quite a bit more squeeze to hit that 150 mark in torque.
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