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Post by borntoride on Jan 1, 2012 20:05:56 GMT -5
a Attachments:
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Post by borntoride on Jan 1, 2012 20:06:25 GMT -5
b Attachments:
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Post by tripletriplenut on Jan 1, 2012 20:25:20 GMT -5
my header pipes are short and are tapered and it will be 3 stage pipe.
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Post by Curtis on Jan 1, 2012 20:27:17 GMT -5
3 pipes and no they will be fine they are not under any tension. what about vibrations? will they not stress crack?
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Post by tripletriplenut on Jan 1, 2012 20:42:13 GMT -5
dont think so. will have to wait and see.
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Post by Curtis on Jan 1, 2012 20:56:39 GMT -5
I am very excited to see the progress on this.
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Post by lc on Jan 2, 2012 21:47:15 GMT -5
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Post by tripletriplenut on Jan 3, 2012 19:41:36 GMT -5
I'll build it get it jetted and then ship it to an unbiased individual along with a set of jetted WTF s to compare it to.
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Post by zambia on Jan 3, 2012 20:11:20 GMT -5
Send on! I can give you Wirges and stock pipes for a base line!
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Post by Walms on Jan 3, 2012 20:44:35 GMT -5
I'd say bring your S2 to Paris and see if you can keep up with Roland... ;D ;D ;D
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Post by Curtis on Jan 3, 2012 20:47:55 GMT -5
take it to a dyno and compare numbers.
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Post by teazer on Jan 4, 2012 18:47:52 GMT -5
What I never was able to get my head around was how do you fabricate a collector that the exhaust flow sees as a pipe section. Every one I tried has an immediate open space that sound waves "see" as the end of a pipe or at least as a step.
I see that the Konig uses the same sort of stub manifold that most sleds seem to use. Presumably that limits the header size and reduces timing errors. At least a 180 degree twin has less of an issue there than a triple does.
Surely though all pulses - good bad and out of time, all have the strength of the pulses reduced when the wave hits the fork in the road. I haven't studied it too much but wave velocity must stay more or less constant and amplitude must he reduced by 2/3rds which makes all pulse effects less that in single pipes.
Or can wave amplitude also remain constant at a split. I don't remember covering any of that in fluid dynamics classes.
Any hydraulic engineers tell us what happens when a wave reaches a fork with two or three equal branches.?
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Post by Walms on Jan 5, 2012 11:12:57 GMT -5
It could be that the 3 into 1 pipe isn't as efficient for the top end for the super charging effect but it's ability to scavenge the cylinders throughout it's usable rpm range will still give a good "area under the curve" I looked at some data for Polaris sleds right from the factory... Difficult to know if the motor specs are the same but the models with the same displacement with 3 into 3 had about a 20% increase in peak hp.... Also from a sled forum, this peak hp was less desirable then the benefit of the 3 into 1 for torque production.
They also said to keeping the header pipes as short as possible is a gainer for top end with a 3 into 1 one which makes sense as well...
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Post by lc on Jan 5, 2012 13:23:42 GMT -5
I looked at some data for Polaris sleds right from the factory... Difficult to know if the motor specs are the same but the models with the same displacement with 3 into 3 had about a 20% increase in peak hp.... Was this on a triple or a twin cylindered engine? J
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Post by Walms on Jan 5, 2012 13:56:20 GMT -5
Who gives a rats a$$ about twins??? Lol
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