Intake & exhaust man. treatments (Micro-Abrasives)

[TwentyTwo]

Though there's probably a few 50mm x 3000mm exhausts getting around, wherein there is no concern about fuel atomisation/suspention mixture properties. Treating the entire exhaust system wouldn't be worth the cost for the negligable benefit I'd imagine.

I guess it's probably starting to get to the point where most of these things have been tried already, hence the things you rarely or never hear about (ie micro-abrasive polishing manifolds) have most likely been proven non-beneficial by some R&D egghead at some point in time.
Technological (engine) advances these days seem to be more focused on variable geometry, in one application or another, mainly aimed at increasing torque spread and efficiency.
But long and painful be the quest for the power of the horse!

Thanks for all your input guys, +1 for all!

[oldcorollas]

just a few notes

if you have a boundary layer and are concerned about the reduction in port size..... make the port size that much bigger again

boundary layer is very good in most cases. think.... olympic swim suits, yacht hulls (the expensive ones ), shark skin (iirc) etc... oh... i know those three are in water, but.... i was going to mention the cooling layers on turbine blades but...

oh, and if you want to compare any of their published images (about surface finish), i have recently taken a bunch of pictures with FIB (focused ion beam machine) because i am studying the effect of surface roughness on ... things so i have pics from between sandblasting and 3um diamond finish..... basically, between 400grit and 1200 grit there is bugerall difference (might be a bit different on a soft alloy tho), but 120grit has only a few microns roughness.. sandblasting gave a roughness (peak to valley) of 5-10microns...
etc...

Cya, Stewart

ps, i love it when companies claim things to do with electron microscopes it sounds so full of techamanology...

[Rodger]

All fantastic theroy stuff guys.

I hope one day you will be able to use it in one of the top Motorsport teams around the world. (What a job).

I understand all of it and what is trying to be acheived but what will us poor plebs gain?

If I were to chase that couple of tenths or 3 or 4 horsepower then maybe all worthwhile.

Good hand match porting of inlet tract/manifold and match porting hand polishing of the exhaust ports/manifold gives so much percentage gain over stock as has been said.

Not being sarcastic here just, bringing us plebs back to earth a bit.

Regards

Rodger

[Ben Wilson]

It's the reason golf balls are not smooth, and would go 5 to 10% less distance if they were.

Yes and no, golf balls are dimpled to keep the air around them and fill the vacuum behind them. A smooth ball punches a neater hole through the air and leaved a bigger wake behind it. Apparently racing yacht masts are ribbed for a similar reason.

[tricky]

just a few notes i was going to mention the cooling layers on turbine blades but...

lol! That is where I first started in fluid dynamics. Not specifically turbine blades, but same fish, different smell.

Ben: a wake? Kinda like a boundary layer?