Extrude hone

[JustenGT8]

Anyone know how controllable this process is? I'm interested in porting an inlet manifold but keeping the head face port size stock ie will still match the stock head. Hope to create a taper from plenum runner inlet down to the head port.

I doubt extrude honing can achieve this but seems to do some amazing stuff so thought i'd best ask before dismissing it.

[Ben Wilson]

If you got a copy of the manfiold gasket laser cut out of steel and bolted it on before the process, that might work.

[stradlater]

Hrm, Ring this guy:
Andrew (I think that was his name)
Power Porting is his company name
0438418028

Seems to have been very helpful when I spoke to him. Certainly knows his stuff though.

["Z" UTE]

As far as I can see, this process would be similar in effect to a glacier. Although at a higher speed. Gouges and pushes its way through, taking the path of least resistance. May be good for removing dags in pipes, manifolds and heads. They use a high viscosity grit entrained putty.

my 2 cents.

cheers Chuck.

[Billzilla]

Avoid doing it.
The grinding material won't make the port a better shape, only bigger and grind away areas of most pressure to the material.
A good cylinder head shop will always do a better job, and probably charge less.

[JustenGT8]

Yeah that's always been my view Bill...the recent article in Zoom though did give me pause to have another look though as the process does appear alot more controllable than i had thought possible.

A bit of a long shot but i'll give the Power Porting guy a call anyways.

I really just want a quick and dirty to show if this aproach has any merits as the calcs seem to suggest. If it does then it's a full custom plenum anyways. Intake design is a tricky business so not prepared to launch straight into fab with the current setup performing well at current hp levels.......

[Bored?]

Yeah, I couldn't believe it when someone said they had tried it on a turbo compressor housing.

I don't see how the shape you get by slowly pushing a thick abrasive paste is going to be anything like the ideal shape to get maximum flow for a lightweight gas at high velocity.

You can probably use it to get a nice finish on something without removing much material, so I imagine it would still give flow improvements, but it's not going to automatically find the best port shape as they seem to be claiming.

On a tangential but related note, it's interesting that some people claim to have gotten performance gains using epoxy to fill and smooth intake ports, rather than removing any material.

[JustenGT8]

A mate had his 3SGTE intake manifold and CT26 compressor housing done. Before and after flow specs on the intake and the gains were impressive.....no data on % difference between runners though which would be my major concern. Can't really test the comp housing but he swears it's improved....for the price he paid he would have to though

[stradlater]

Clearly you've read the latest Zoom too hey Bored? I was interested in that one too, it seems that they wanted a smaller port size so as to speed the gas up.

[Billzilla]

A mate had his 3SGTE intake manifold and CT26 compressor housing done. Before and after flow specs on the intake and the gains were impressive.....no data on % difference between runners though which would be my major concern. Can't really test the comp housing but he swears it's improved....for the price he paid he would have to though

Yes, bigger holes will flow more air - duh!
But will the engine go better and better with bigger and bigger ports?

[Ben Wilson]

But will the engine go better and better with bigger and bigger ports?

It will if the factory ports are too small and causing a restriction.

[JustenGT8]

THAT is the question eh Bill I would have said no...up to a point anyways and i have been of the firm belief that it's the UZ cams that are the big top end flow restriction.

The discussion on V-eight.com seems to suggest that i'm getting some nasty intake velocities though, which may be causing my top end hp taper. Some first hand experience of larger runners giving some impressive top end gains with no down side in the lower rpm.

As i said, intake design is tricky and i've seen as many, if not more, go backwards or at least backwards everywhere other than peak hp. The car is currently sooo responsive i def don't want to trade that away for some dyno queen hp

[mrshin]

Justen, you have a PM

[Billzilla]

It will if the factory ports are too small and causing a restriction.

Didn't you know that the word "YAMAHA" written on a lot of Toyota heads is Japanese for "My inlet ports are too big".

[Joshstix]

Didn't you know that the word "YAMAHA" written on a lot of Toyota heads is Japanese for "My inlet ports are too big".

Nobody is talking about porting head's here though as far as I can tell. The question is about porting the inlet manifold with extrude honing, which I think is a good idea. To port it traditionally I suspect you'd have to chop it up into pieces and then weld it back together later with the complicated design of most late model V config manifolds.

With the concept of extrude honing it should take metal off the most restrictive parts of the orifice. If the port's at the head flange are not the most restrictive part of the flow path then they should not be touched, in terms of material removed, until all of the rest of the restrictions have been removed to the point that the ports have become a restriction. Obviously knowing exactly how many cycles of pushing the media through will result in having all of the restrictions removed up to the point of starting to remove material from the mating face is going to require some experimentation. If they have not done a 1UZ manifold before then this may be somewhat hit and miss.