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TW-6-6 vs TW-222

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Old Sep 4, 2012 | 02:25 PM
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Sincere question - where does "bottom end" end, and "top end" begin?
 
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Old Sep 4, 2012 | 02:32 PM
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Originally Posted by Keithhu
Sincere question - where does "bottom end" end, and "top end" begin?
Probably not an official position, but my thinking is:

Bottom-end: < 2800 rpm
Mid-range: 2800-4000 rpm
Top-end: >4000 rpm
 
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Old Sep 4, 2012 | 03:25 PM
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For me, it helps looking at actual numbers as opposed to a graph, so here is what I found on FM's site (my own rough estimates reading the graphs):

TW-555:
2500 = 35hp 80tq
3000 = 50hp 104tq
3500 = 73hp 108tq
4000 = 83hp 108tq
4500 = 89hp 104tq
5000 = 94hp 98tq
5500 = 96hp 92tq

TW-222:
2500 = 47hp 100tq
3000 = 64hp 111tq
3500 = 75hp 111tq
4000 = 83hp 109tq
4500 = 90hp 105tq
5000 = 93hp 91tq

I didn't bother recording the 222 after 5000 rpm as it already made its peak power. Now I see what they mean by "your riding style" as I rarely every break 5000 rpm, so for me, I wouldn't see a gain on the 555 like I would on the 222 based on the numbers at the rev range.
 
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Old Sep 4, 2012 | 04:02 PM
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Wow, looking at it that way and the 222 looks really good. In normal riding I'm shifting before 4000 rpm.
 
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Old Sep 4, 2012 | 04:04 PM
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What I'm most impressed by are the torque numbers for the 222. Wonder if alot of that is from the intake valve closing early thereby building more cylinder pressure.
 
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Old Sep 4, 2012 | 04:12 PM
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- sorry, computer geek here and I only know the basic functionality of cams. I'm going to go ahead and agree because I wouldn't know any better about closing or opening position of the valves in relation to power. All I know is bigger numbers = good.
 
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Old Sep 4, 2012 | 04:21 PM
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Originally Posted by desertwolf
What I'm most impressed by are the torque numbers for the 222. Wonder if alot of that is from the intake valve closing early thereby building more cylinder pressure.
I believe that's the case.
 
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Old Sep 4, 2012 | 04:57 PM
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I have a question that I'm hoping Jamie can chime in on. When using the adjustable push rods, does that not affect the accuracy of the whole setup? And if that is the case, and adjustable rods are not as accurate, will the stock rods work, and do you have any instructions on that process?
 
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Old Sep 4, 2012 | 05:04 PM
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curious will they be equal tunebility wise or will one be tougher to tune? Will one run cooler in a stock 103? For 555 vs222
 
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Old Sep 4, 2012 | 05:28 PM
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Originally Posted by punisher660
I have a question that I'm hoping Jamie can chime in on. When using the adjustable push rods, does that not affect the accuracy of the whole setup? And if that is the case, and adjustable rods are not as accurate, will the stock rods work, and do you have any instructions on that process?
Adjustable pushrods are actually more accurate. Once you take up the slack, which could vary engine to engine, you can then adjust them To compress your lifter the exact prescribed amount (.100 for stock lifters).
 
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