extruded honing?

**steve** · 02-04-2005 09:22 PM

Have ne of u ppl heard of extruded honing? saw article in hot 4's i think, where they push a thick gritty paste thru wot eva u want done ie intake/ exhaust manifold, reckoned it made it waaay smoother than stock, ne ppl got it done? results?

**ProECU** · 02-04-2005 11:46 PM

its not ideal as it will continue to remove material....

porting a manifold is your best option

**steve** · 03-04-2005 05:03 PM

hmm, ok, thanx proecu

**Steer^Gimic** · 03-04-2005 05:38 PM

i believe extruded honing is the same effect as porting, but being able to get to the ports where the current method cant.
what do you mean by continuing to remove material proecu?

**sivic** · 03-04-2005 10:40 PM

yeah, thats right. it means to polish say, an intake manifold, you dont have to cut the thing inhalf to get inside and then have to reweld.
the method also bring fluid dynamics into account a lot more and polishes areas which are more of an obstruction to the airflow.
its a dyno proven (many tests in various honda tuning books) method to increase both torque and power across the range (how much does this sound like a plug

).
once it is done it wont continue to remove material.
only prob is no one does it in oz (as far as i know)

**BLKCRX** · 03-04-2005 10:47 PM

Extruded honing is very effective on intake manifolds, especially modifying stock ones, then again its also very effective to cut them open, port / re design the way they flow and re weld them back up..... each have there benefits. Remember intake ports need to be "rough" to help turblizes the air to increase the spray of the fuel from the injector. Smoothed polished intake’s are a no no in my eyes ! But more volume from honing, or removing restrictions is always a bonus if done correctly…. Its how you make more power

both turbo and NA car’s love these kinda modifications.

Regards James

**ProECU** · 03-04-2005 11:04 PM

Nothing beats the porting method James describes for many reasons, but here are a few:

1. Porting allows you to obtain the "Level of roughness" or desired micron depth finish to "stimulate" the air particles in the intake manifold.

2. Porting allows the porting of the junction between the runners and the chamber.

Adversely, honing will not remove material in places that air flow "likes". Fluid dynamics and air in a conduit are similar, but not the same.

Both will provide flow improvements, but its not flow that increases power, its more to do with atomisation as James mentioned and velocity of air travel at relative piston speeds. In other words, get it ported, not honed, your torque will thank you!