What do you think about extrudehoning the head, intake (manifold and trottle body) and header?

I mean SCREW THE DAMN CARB ****, I can extrudehone the stock stuff and avoid dealing with Cops all together. And I would do this on the B18C that i am planning on swapping.


[Modified by Spade, 9:19 PM 10/12/2001]

 

When you see what the prices are, you might want aftermarket stuff. But definately worth it, if you dont want all the flashy stuff that screams for attention.


[Modified by 9KRacer, 7:22 PM 10/12/2001]

 

Well, extrude honing isn't going to exactly increase bore size, but it will smooth out the airpath for a higher speed airflow. I'd say bore, then extrude hone.

 

Lisa Kubo is kicking *** with it, I trust em!!!

 

It does increase bore size though. I don't have the picks to prove it but, the purpose of extrude honing is to get the same diameter throughout the whole airway. When you port you still cannot get deep inside and so you still have a small airway just a big opening. I have looked that the cost and yes, it is high as hell but, So are the aftermarket parts. A intake manifold goes for about 600 brand new right? Well it only costs 400 to extrude hone the manifold. The total cost for the process on any 4 cylinder aluminum is around 2000. That includes intake manifold, head, and exhaust. Plus the gasket matching. which is 80 per gasket but what why not since that will probably interupt the pathway!!!


[Modified by Spade, 5:13 PM 10/15/2001]

 

Jesus man, $2g's for the full job?

That's some serious cash for a clean pathway. Too much

 

Don't believe everything you read. Extrudehoning might work on a stock exhaust manifold as a sleeper, but it's not good for heads or intake manifolds because you can't control how much you are taking out and where you are taking it from. I would be shocked if Kubo has one piece on her car that uses that process. All her stuff is designed and done by the best pros and no amount of extrude honing will make it better. Go ahead and flame me but it's the truth.

 

If they're running their original type R manifold again, that manifold is in fact extrude honed. I've seen it off the car in person. At one time they were running the STR manifold and at the last race I was at they've taken it off for the type R. That says soemthing now doesn't it?

 

One of the main aspects of the Extrudehone program is that they balance the material removed and eliminate variations between different ports or runners as well as enlarge the size.
One example. Stock Ford 5.0 intake mani. Before-All runners are flow tested and reveal variations from 126 cfm to 159 cfm. After honed, the runners average a 228 cfm flow rate and are all within 1-5 cfm of each other.... not bad

I agree though, it is very expensive, they only offer a 10-15% discount for low-volume wholesale distributors.

 

I disagree. The idea behind extrude honing is to raise the flow capacity of whatever channel, while keeping the overall volume close to stock. This is so you don't lose low rpm airflow velocity.

Of course, you CAN go in there, and run the cutting agent enough to increase the volume a lot. But I wouldn't suggest it, unless you knew what you're doing, and know a bit about fluid dynamics.

 

Extrudehoning does work on intake manifolds. I dont know how much of an effect it will have on exhaust manifolds, but I had an aluminum intake manifold extrude honed and we did pick up considerable flow. As for extrudehoning the head, I wouldnt recommend it, no matter what extrudehone says, although you can control how much material you take off, you cant control where you are taking the material out of. So extrudehoning the head wouldnt be as beneficial as porting where you can take material out of select areas/

 

I want increased flow rate. (everyone does spade!!!) Oh um, I don't think that an increase size will matter as long as the flow rate is good enough, I think that the two might go hand in hand but, if I can get stock to flow as good or better than aftermarket then I am all for it.

I did not think about the fact that you cannot control where the material is taken from however, is porting that good to where the flow rates are better than extrudehoning? I know that EH will get areas where the bits cannot go.....hmmm, time for some comparisions....funny though where the hell am I going to find. I have decided to hone the manifold though. Now I just have to decide on the header. Off the subject, what is the difference betwteen a 3 angle and a 5 angle valve job?


[Modified by Spade, 3:11 PM 10/16/2001]

 

Well, the thing is, bigger is not always better. Especially for a more balanced torque curve. With low RPMS, it's better to have a smaller, sleeker airpath. Where the airflow can gain speed of of itself. The air will almost push itself into the combustion chamber. At high RPMs, it's a little different. Like I said, I wouldn't just go in there hoging out the head or IM, unless you know a few things about fluid dynamics. Ask whatever company you're planning on taking this to, if they have any experience with 4 cylinder VTEC engines, they'll probably say the same thing.

Espiler has a point on using it on the head. But extrude honing will cut the areas of the head that restict the airflow. It will cut the parts that make the air change direction too much. Because it is a liquid, it flows like air, So it cuts the same parts that would get in the way of the air.

 

Intake Manifold: Extrudehone
Heads: 3 or 5 angle valve job + port and polish
Exhaust manifold: Still undecided

 

Just remember, bigger isn"t better. Extrude hone should work on a stock exhaust but will it cost less and give you more power than headers? Your motor won't know the dif. between a 3 angle and 5 angle valve job. 5's are quite hard to do properly and can be expensive to do and to maintain. A lot of cuts in a little space. A good head porter can make your manifold work as good or better than an extrude hone. Its all about removing a LITTLE bit of material in the right places and the finish on the walls. A good head porter can reach anywhere in the manifold to fix the bottlenecks.

 

i agree, leave the head work to an experienced machine shop, but the intake manifold, if you decide on keeping with the stock parts is a great idea... have you talked to extrudehone yet?@ call em up and bug em... then call back and talk to someone else and bug them, and see if you get the results you're looking for. They have to answer your questions, because it's their job, just don't hang up until you feel satisfied.

exhaust manifold..... i guess it would be a good idea if you already have a "cast" turbo manifold, i hope you're talking about a turbo manifold... but if you are in search, and have the room in between the core support, i recommend you spend some extra dough on a custom stainless tubular manifold. should be the same or cheaper than the cast manifold+hone and flow 20-%30% more efficiently. my .02

i would stray away from building the worlds most expensive "stock header" setup. aftermarket is your best/most affordable option.


[Modified by oOxsboostOo, 7:51 AM 10/17/2001]

 

bought the parts and shipped them.
Intake Manifold = Type R to extrudehone
Head = Will get a port and polish from a local shop
Header = DC sports 4-2-1 still wondering if I want to extrudehone that <EG>