Extrude Honing???

[rivmasta]

Has anyone had experience with getting intakes, heads etc extrude honed?

As I understand the theory, thick grinding paste is forced through which either cuts or polishes dependant upon the type of paste being used. Also a convenient way to port match plenum to mani, mani to head. Supposedly much more effective than traditional port/polish methods.

Any thoughts? heard any info? Im interested... but not sure if its worth it for a mild setup.

 

[ed_ma61]

supposedly much more effective than traditional port/polish methods

blah - i refuse to believe that...

just because the incoming flow of grinding paste wants to go there doesnt mean thats the shape of the most desirable air flow, at ALL

ps -im drunk

 

[Toysrme]

Never had anything done with the EH process myself. That being said, I've never heard anyone report much more than "it looks awesome & is a great *theory*".
I've seen all of this info on how good it is, and it seems like all of the *real* good gains always come on some lanky domestic engine.
Ofcorse everyone knows how domestic engines love porting & polishing. That's because the entire intake & exhaust tracts are so messed up to begin with - you could fart down the intake & gain 5bhp.
Seriously - the kinds of sintuations where a dremel, a flexi-shaft, and a flap wheel sanding disk would gain some justafyable power.

I'm not downing what they do. I've never been impressed with the results I've run across online, or with friends, on anything that entire type of "process" has done to an engine that came from the factory with something useable to begin with.




I'm sure someone will come across some good examples, but please ake into consideration what other methods do & how bad the example was from the factory before really jumping on that bandwagon.

 

[Zuffen]

Holden (GM in Australia) uses EH on their exhaust manifolds.

I think it's primarily to clean up the inside from shabby casting.

There was a big article on Autospeed about it and some of the results are huge but as Toyrme said "on domestic engines"!

 

[rivmasta]

I did a bit of digging and asking around the traps and most common reply seems to be:

If you want mega hp on a pro-stock engine, do it. If you want torque dont bother. The money spent is better spent elsewhere - buy a dremel.

Big plus is turbos - polish the impeller and housing and there are big gains to be made. As Im not running FI I kinda kept switching off at that point though som Im not sure what those gains are...

I'll just knock off the worst of the casting dags and go racing!

Found some info here - but its pretty sales orientated...
http://www.extrudehone.com/auto-oem.html
http://www.gethoned.com/
http://www.abrasiveflow.com/first.htm