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[hogasm]

If one were to have a set of rods built for their motor that were 80% lighter and stronger than stock, still utilizing the stock crank...

How much of a gain in performance would be obtained.....hypothetically of course.

Seems that the less weight that is slung would create more power.

[lucky1]

Years ago we made rods for a XR from Ti. So much weight had to be trimmed from the flywheels to get a balance, that the flywheels flexed to much to be used! Things can be made to light for their job.

[Midnight Rider]

If one were to have a set of rods built for their motor that were 80% lighter and stronger than stock, still utilizing the stock crank...

How much of a gain in performance would be obtained.....hypothetically of course.

Seems that the less weight that is slung would create more power.

It would let it rev quicker, all other things being equal.

[hogasm]

Years ago we made rods for a XR from Ti. So much weight had to be trimmed from the flywheels to get a balance, that the flywheels flexed to much to be used! Things can be made to light for their job.

This is one of the situations that need to be addressed. It is possible to get too light.

[naitram]

while i understand lighter is better, part of what keeps an engine rotating is all of that rotating mass

[hogasm]

while i understand lighter is better, part of what keeps an engine rotating is all of that rotating mass

Neil, with all these know it all because I have done that guys on here, Thought that one might stand up and say

This is what we did and it worked   or

This is what we did and it didn't work


when we used to build NASCAR motors a few years back, we would use connecting rods that were about 80% lighter than stock, and were  much stronger!! Have heard that some of the Sporster motors that are being built for drag racing have changed the rods for lighter, stronger ones.

[naitram]

Neil, with all these know it all because I have done that guys on here, Thought that one might stand up and say

This is what we did and it worked   or

This is what we did and it didn't work


when we used to build NASCAR motors a few years back, we would use connecting rods that were about 80% lighter than stock, and were  much stronger!! Have heard that some of the Sporster motors that are being built for drag racing have changed the rods for lighter, stronger ones.

way out of my are of expertise, was just thinking out loud

[Hoist!]

Do I hear TITANIUM being considered here?

Hoist!

[Coolbreeze]

I speak with the weight of virtually no practicaly experience, BUT, I agree with both sides here.  I know that you require a certain amount of mass for the motor to keep roating at an idle under minimum fuel application.  HOWEVER, the less mass you have the faster the motor will rev. 

I used to run lightened rods in the VW and porsche motor s that we put in sand rails.  We never had a problem with breakage no matter how light we went, but the mild cammed motors wouldn't idle well with the light rods.  The heavy cammed motors idled higher though, and didn't have that problem, and did produce substantially more HP, but less torque. 

I think the real direction of your question might be, " how much lighter can I make the rods in my _______, and still idle well at ________, have good general driveability, and not come apart at __________ rpm.  "

yet another useless o2

[Twolanerider]

Brian, this is something you might wish to speak with Otis about.

[hogasm]

Brian, this is something you might wish to speak with Otis about.

 :zwtf:are you saying that Otis might know a little about titanium          

[Twolanerider]

 :zwtf:are you saying that Otis might know a little about titanium          

No Brian.  But making internal components lighter might be an area he's had some experience.  Different than to the degree that you're specifically asking about.  But my guess is that his might be the only real Twin Cam specific experience readily available here.  Granted, his bike has always been stock of course.

[hogasm]

No Brian.  But making internal components lighter might be an area he's had some experience.  Different than to the degree that you're specifically asking about.  But my guess is that his might be the only real Twin Cam specific experience readily available here.  Granted, his bike has always been stock of course.

Of course