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Engine Specific Info and Questions => TDI Engine -General Info => Topic started by: GEE-BEE on May 10, 2014, 10:37:02 am
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Sending in another PD150 intake for polishing
http://extrudehoneafm.com/
Iam having the headwork done also on this ALU build this will match the intake..
Justin at greaseworks got one that was done and its first time he had seen this process or quality
We do this on all the Allison / Rolls Royce turboshaft helicopter intakes assys
GB
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interesting approach. I don't doubt that it works, to a point.
"polishing" though turns out to be a dead end in performance. dimpling, like a golf ball, it turns out, increases the velocity of fluid transfer (air is a fluid) by creating small tight pockets of high compression which have a 'surface' far smoother than any solid material.
this has even been applied to aircraft fuselage paint, which now has an irregularly mottled surface. They tried giving it a regular surface, but it tuns out that the irregular surfaces perform better over-all by discouraging the formation of resonances and standing waves.
still, this must beat the heck out of sitting at a work bench with a burr.
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Generalizations like hat can land you in a lot of trouble. fluid dynamics is a complicated thing.
Finish is adjustable by varying grit size.
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I have a PD130 & Pd150 inbound from Europe..
One will have it , one wont, your welcome to put them on a flow bench if you wish..
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gee-bee you should make a build thread, its hard to keep track of 20 different posts
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I am just posting info...
Sometimes Iam really sorry I do
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I am just posting info...
Sometimes Iam really sorry I do
keep it up i enjoy it ;^P
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I bolted an extrude hone head and intake manifold on a Lysholmed g60 of a friend and saw 30+whp increase and no drop in psi. I would love to send a TDI head and manifold to them.
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I'd post pics but it's complicated on this forum
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Justin at Greaseworks had the same results....
I rest my case..
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A few years ago, I sent a set of ALH auto nozzles to them for larger holes. I think they were enlarged to .216. They worked great and the cost was about $100 and a sheet was included showing the calibration of the flow.