CF Rods for your Commando?

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Reducing reciprocating weight of rods and pistons is one of the things which I found, gave a noticeable improvement in performance. I fitted pistons into a Triumph 650 which were about 100 gram lighter. Every time the pistons and rods reach the top and bottom of the stroke, they must stop and reverse direction. Inertia is a major factor. I don't believe that lighter valve train components would help a motor accelerate faster. It would just increase the rev limit. However the valve train is not what limits the usable revs of a Commando motor. It is the bottom end and the forces involved.
 
acotrel said:
Reducing reciprocating weight of rods and pistons is one of the things which I found, gave a noticeable improvement in performance. I fitted pistons into a Triumph 650 which were about 100 gram lighter. Every time the pistons and rods reach the top and bottom of the stroke, they must stop and reverse direction. Inertia is a major factor. I don't believe that lighter valve train components would help a motor accelerate faster. It would just increase the rev limit. However the valve train is not what limits the usable revs of a Commando motor. It is the bottom end and the forces involved.
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No argument there. But the standard length Crower titanium rods I used had a small end weight of 120.7 grams, where the last standard length Carrillo steel rods I used had a small end weight of 134 grams (an earlier version was 142). That's not a huge difference, considering how much more expensive the Ti rods are. For reference, a stock Commando rod small end typically weighs around 75 grams (71 to 80 in my samples), and the JS (Carrillo) long rods I have weigh 105 grams at the small end.

Ken
 
lcrken said:
No argument there. But the standard length Crower titanium rods I used had a small end weight of 120.7 grams, where the last standard length Carrillo steel rods I used had a small end weight of 134 grams (an earlier version was 142). That's not a huge difference, considering how much more expensive the Ti rods are. For reference, a stock Commando rod small end typically weighs around 75 grams (71 to 80 in my samples), and the JS (Carrillo) long rods I have weigh 105 grams at the small end.

Ken
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Does that include the wrist pin and bearing?
 
Me thinks i will stick to my orginal rods, I am a cheap bastard lol.

Ashley
 
swooshdave said:
Does that include the wrist pin and bearing?
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It does not include the pin, but does include the bushing, if the rod has one. The normal Carrillo rods and the Ti Crowers use a bushing. The stock alloy rods and the JS long rods do not.

Ken
 
kommando said:
You would be surprised, I thought the same, surely a patent to to protect a new idea but then Apple patented rounded rectangles.

https://gizmodo.com/apple-finally-patents-the-round-cornered-rectangle-5958762
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I have a couple patents and have learned a bit about the process - I doubt apple's rounded corner patent is worth anything.

Kommando - note that the article you quoted says "it's easy to find patents like this invalid in the courts on prior arts grounds".

Lighter materials will always help to reduce the destructive Norton vibration - but as Ken says - it probably won't happen soon or be too expensive. When it does finally happen there will probably be many other amazing things to distract us.
 
The only thing I don't like about titanium rods, is that when titanium cops a beating, it changes dimension very rapidly.
 
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