There use to be that many people back in the early '90's.
They have since gone on to goverment contract's and I haven't been there in 10yr's to know.
They don't advertise much,so they must have plenty of business.
I still think it's a good idea if ya have the money and want the last little bit after porting.
The process isn't a "porter" in a can but it works for what it was intended.

 

go here


http://extrudehone.com/oem.html

 

The last time I checked i didn't see any motors in the engine masters running these heads! maybe you should do some reading. http://www.cartechbooks.com/vstore/s...ct_ID=21&DID=6

 

The guys that run them and find an advantage ain't telling.
Do you think they would put it in a magazine to be read by the world.
To sight an example-- How many of WJ's scrert's do you know!!!!!!

 

Haven't taken up permanent residence here have ya 'dude?

I'll tell ya what I know of the whole Extrude Hone process. First off, this is alot bigger with the import crowd than it is with us domestic builders. Gains for those guys are usually in the 1-5 hp range from everything I've seen. These include heavily modified engines.

With the Ford guys (I own a 2001 Ford Lightning), I see posts typically showing gains anywhere from 2-8 hp range for EH ported intakes and maybe 10 hp with stock EH ported heads. Certainly nothing to scream about.

The guys doing all the high HP claiming are the ones selling the process, "See gains of 15-30 hp!". Haven't seen anything close to that yet from an EH port job and I challenge anyone to link an independent before and after test that has.

From the mouth of a good friend of mine, Don Losito of Ultra Pro Machine, one of the foremost cylinder development gurus in the country... he has flat out told me that, "EH porting can do more damage than good". In his opinion, the process makes a port wall that is too smooth, especially in a wet flow runner. It can also wipe out a well defined short side radius.

I can't imagine someone spending half a million dollars to tool up a CNC, drive toolpaths based on a master port, then wipe it out with an abrasive. You may know some guys doing it but I don't. I know some of the fastest drag race guys around right now and they all have CNC toolmarks in their ports.

I think it's a good process for some things.... say, difficult-to-port intake manifolds. Maybe coolant passages? I'll stick to my head porter.

-Mindgame

 

Mindgame....

EH hone keeps busy doing NASCAR HEADERS of all things.... they find 5-7hp with a clean carbon free header on a motor than a used header. In Cup terms that's a ton of power. Yep that's right they use the process to clean out headers, $7000 a set Inconell headers at that!

That's about the only thing I have heard that they are good for in terms of finding HP on high dollar motors.

Bret

 

Yeah, like I said, there are some things I think the process is perfect for... just NOT porting heads. I'm still kind of wondering about coolant passages? Seems that it'd help lower frictional losses in the coolant system but I haven't given it a great deal of thought yet.

I've heard of it being used on gears and impellers and stuff like that to reduce frictional losses but who knows.... there are probably hundreds of uses for the stuff.

-Mindgame

 

I like the coolant idea as well, but when I asked them they said it would get caught in the small areas and would be close to impossible to clean them out. I would like to try it though, but oh the money and tools to measure it's effect would cost a little coin.

Bret

 

Oh yeah... experimentation cost money, I almost forgot about that.

Goes back to what I was saying in my other post about all the things I'd like to test. Maybe in my next lifetime.

-Mindgame

 

Just trying to keep up with you guy's..

 

I dont remember seeing a LT1 in there either...