Has anyone used Torque Cones in their pipes?

[Momz]

I have Cobra 6x6 pipes on my Rat Rod.

The Cobras sound great but thre is no scavenging effect of straight pipes, thus a decrease in possible torque. And why is it that the TBR 6x6 pipes did not effect performance? Did the TBRs have some venturi system within them?

I need to know if anyone has tried "Torque Cones" to increass exhaust flow velocity on their Valks. What Brand (Barons)?

[Ricky-D]

Torque cones are mostly used on large displacement v-twin motors with non-restrictive exhaust systems.

Velocity is best achieved with smaller diameter exhaust pipes.

Any influential velocity increase at the exhaust port is effectively negated by large exhaust pipes within the first part of the travel of the gasses.

The general v-twin consensus is that exhaust cones are ineffective and power reducers.

Scavenging exhaust gasses is a very complex area of endeavor and is affected by many more things than exhaust pipe size and power cones.

***

[98valk]

I have Cobra 6x6 pipes on my Rat Rod.

The Cobras sound great but thre is no scavenging effect of straight pipes,

not true. they are what are know as a drag pipe design exhaust. the design was developed for dirt circle track racing. they are tuned to actually develop more HP and TQ in a narrow constant rpm range which is exactly what the dirt circle track racers run at. not good for the street which is not a constant narrow rpm range.

I posted over a yr ago the dyno results from factory pro with their airbox and jetting mods to get back the loss HP with cobras.

[Ricky-D]

I think, what is getting lost in the discussion is the fact that the Valkyrie is like:

Six 250 cc motors combined on a common crankshaft.

250 cc's is not anywhere near a large displacement motor.

Honda has always been the leader in multi-cylinder small displacement motors.

Looking for large displacement modifications on a small displacement cylinders is a losing proposition.

If you look at the exhaust pipe on the standard exhaust for the Valkyrie it is easy to see why a large diameter pipe such as those 6 into 6 are not motor friendly.

***

[Momz]

OK,....threse responses are not getting me the answers I need.

Let me rephrase my question like this:
So what makes the TBR 6x6 pipes not lose HP/TQ and the Cobra 6x6s do?
And would "Torque Cones" work in the Cobras?

[Ricky-D]

Why don't you try them out.

There's probably a bunch here on the forum that would like to know the results.

***

[98valk]

OK,....threse responses are not getting me the answers I need.

Let me rephrase my question like this:
So what makes the TBR 6x6 pipes not lose HP/TQ and the Cobra 6x6s do?
And would "Torque Cones" work in the Cobras?

never seen dyno of TBRs.   however most likely pipe ID is the same as oem, I know cobras are larger ID.

do u have link/pic to TCs?

what are u using now?

[fstsix]

More back pressure will give you back some low end, The Vikings on my bike had a large Non restricted baffle, This summer i called Samson and talked to the owner and purchased a smaller "ID" baffle to 2 1/4 for more back pressure..Bike ran better off idle and was not so loud..The exhaust now performs with a lower tone and crisp. The reducer cone has a perforated mesh. nice design. they have all sizes available.  http://www.samsonusa.com/quiet-power.html

[98valk]

More back pressure will give you back some low end, The Vikings on my bike had a large Non restricted baffle, This summer i called Samson and talked to the owner and purchased a smaller "ID" baffle to 2 1/4 for more back pressure..Bike ran better off idle and was not so loud..The exhaust now performs with a lower tone and crisp. The reducer cone has a perforated mesh. nice design. they have all sizes available.  http://www.samsonusa.com/quiet-power.html

backpressure reduces power. lower exhaust gas velocity reduces torque.
a good design keeps velocity high with almost zero backpressure.
read everything written by David Vizard about exhaust design.

[fstsix]

More back pressure will give you back some low end, The Vikings on my bike had a large Non restricted baffle, This summer i called Samson and talked to the owner and purchased a smaller "ID" baffle to 2 1/4 for more back pressure..Bike ran better off idle and was not so loud..The exhaust now performs with a lower tone and crisp. The reducer cone has a perforated mesh. nice design. they have all sizes available.  http://www.samsonusa.com/quiet-power.html

backpressure reduces power. lower exhaust gas velocity reduces torque.
a good design keeps velocity high with almost zero backpressure.
read everything written by David Vizard about exhaust design.

My reference to "low end" was torque, Smaller tube will have better low end but will suffer at top end. "John Lingenfelter" 

[Hoser]

I have Cobra 6x6 pipes on my Rat Rod.

The Cobras sound great but thre is no scavenging effect of straight pipes, thus a decrease in possible torque. And why is it that the TBR 6x6 pipes did not effect performance? Did the TBRs have some venturi system within them?

I need to know if anyone has tried "Torque Cones" to increass exhaust flow velocity on their Valks. What Brand (Barons)?

I added grumpy's tips to my truck stacks and gained 6 hp and 4 ft lbs of tork on the dyno.  I beleive the restriction of the smaller diameter of the tips caused it.  

[98valk]

I have Cobra 6x6 pipes on my Rat Rod.

The Cobras sound great but thre is no scavenging effect of straight pipes, thus a decrease in possible torque. And why is it that the TBR 6x6 pipes did not effect performance? Did the TBRs have some venturi system within them?

I need to know if anyone has tried "Torque Cones" to increass exhaust flow velocity on their Valks. What Brand (Barons)?

I added grumpy's tips to my truck stacks and gained 6 hp and 4 ft lbs of tork on the dyno.  I beleive the restriction of the smaller diameter of the tips caused it.  

+1 on the grumpys, a work of art and made the exhaust note a little deeper by cutting down on the vibration of the pipes.

[Hoser]

Grumpy does not claim a power gain for his tips, However I beleive thay are the reason for my gain.  Same bike, same dyno, same operator, same state of tune.  99.0 hp, 98.2 tork It is stock by the way, cept for the stacks and tips  hoser