Extrude Honing

[partyboy73]

Does anyone know where I can get some extrude honing done on my RB20 manifolds and what cost is involved...? Any help would be much appreciated, Mike

[juggernaut1]

Andrew Sanders at Specialised Power Porting is the only place in OZ that I understand currently does this.

I have used his services on my exhaust manifold, intake manifold and compressor cover. From memory, 4 cylinder manifolds (intake or exhaust) were $550 each and comp cover around $300. Obviously these prices may have changed and will be more for 6 cylinder manifolds.

[tridentt150v]

A few shops do it, a lot of tuners.speed shops can arrange to get it done. Ask around.

Also try a search, I'm sure this has been asked and discussed, you should get good answers from that.

[PM-R33]

There was a thread on an extrude honed RB25 stock exhuast manifold and no real gains were recorded. Most likely the money can be better spent elsewhere.

Edited October 20, 2008 by PM-R33

[STATUS]

agreed running a few extra psi nets better gains.

[tridentt150v]

Based purely on a power figure I'd agree, but has anyone measured the efficiency maybe as a fuel consumption figure?

If something flows better, it has to have benefit somewhere, even lower rpm for boost gains maybe?

[humz]

obviously it wont be no where near as good but can you do this your self.

just remove the major cast marks with a small hand drill and a drill bit set with sanding dremel.

sound good?

are there any post which discuss this??? maybe a diy tutorial

[juggernaut1]

Based purely on a power figure I'd agree, but has anyone measured the efficiency maybe as a fuel consumption figure?

If something flows better, it has to have benefit somewhere, even lower rpm for boost gains maybe?

One of the advantages is extrude honing allows you to flow balance each runner as well as improve flow overall. For instance my sr20 intake manifold was all over the place and when extrude honed the runners all flowed within a few cfm of each other. Not to mention it also picked up nearly 50cfm of flow on the poorest flowing runner. Unfortunately I had a change of heart and am now installing a Hypertune manifold so I can't say what the real world results might have been with the extrude honed unit.

Edited October 21, 2008 by juggernaut1

[Beer Baron]

http://www.abrasiveflow.com/

[juggernaut1]

http://www.abrasiveflow.com/

When I rang this place (about 15 months ago) he no longer did extrude honing as he had leased/sold his dies and gear to someone else. I think Unique Autosports used to use his services because when I ran Unique about the same time they also advised me they were no longer able to get manifolds extrude honed. Things may have changed now tho'.

Edited October 21, 2008 by juggernaut1

[WARLORD]

a mate went hear and got it done for $100

http://www.racetech.com.au/main.htm

even hurricane exhaust does it too again a mate took his 33 there for the exhaust manifold done.

[SLY33]

There was a thread on an extrude honed RB25 stock exhuast manifold and no real gains were recorded. Most likely the money can be better spent elsewhere.

Yeah that was my little experiment. From what i learned it depends on what turbo/power your going to run which will help you decide if honing the manifold will be worth it.