Tim and the guys in the engine shop have been working pretty diligently on an engine program for the EVO X. With the great success we have had with CNC heads on the EVO VIII and IX we knew it was a must to develop a head for the evo X. I wanted to share a bit of the process involved in the CNC porting process




I am going to show you a series of pictures in sequential order of the CNC process. each will be labeled with a corresponding number, 1-4. Below are the descriptions of each stage of porting all the way up to the final product.

1. - As cast by OEM, this the way your stock EVO X cylinder head would look

2. - CNC ported: Note the un-machined areas in both the port and the chamber. These areas will vary from casting to casting. In some castings a port wall or roof may be left un-machined. This is due to the acceptable tolerances for castings, which allows for a greater amount of deviation in port location and shape than the CNC machining process. During CNC machining, an exact copy of the port shape and size is machined into the casting regardless of the variations in the casting.

Of course, you could modify the CNC program to machine the un-machined areas. This approach would result in the CNC "look" in all the ports, on all the surfaces. The drawbacks is the "modified" port would result in a larger than desired port volume and / or a port shape that is not the same as the originally developed port.

With all of the above considerations, it is our approach to cut the developed and tested port shape into a casting along with lightly hand finishing the un-machined areas in. This is not only more aesthetically pleasing, but proven to obtain the exact results our customers expect. The results are verified on our Superflow SF-600 flow bench by comparing each heads flow numbers after machining to the results of the original "master port"

3. - Hand finishing and blending; this step cleans any transition lines left during the machining process and blends in the previously mentioned un-machined areas.

4. - Finished; All surfaces polished along with a valve job and blending



Now onto some pictures showing this.




Lets start with the bowl area on the head.




First is the stock bowl on the EVO X. Again this is what your stock head is like



Here is after the first stage of porting or Step 2 listed above



Here is the bowl after the next stage in porting, step 3 listed above



And finally the finished bowl, this would be step 4 above






Now lets move to the exhaust port on the EVO X head



First is the stock exhaust port, step 1 listed above



Step 2 on the exhaust port



Step 3 on the exhaust port



Finally the finished product WOW!! step 4 listed above






Lastly we move to the intake port on the EVO X head.




What gets me the most about this is the sheer increase in size of the port after we are done.

Step 1 the stock port



Step 2, after the initial CNC work



Step 3, Some more hand finishing



The final product, WOW is that a great deal bigger and smoother!




There you have it! An inside look at the CNC porting program here at AMS for the EVO X

Eric

 

Fap fap fap

 

Nothing turns me on more than a CNC job!

What are some of your net results?

 

Good work. What kind of flowbench numbers are there for before vs after?

 

Very nice. Whats the cost on this going to be?

 

+1

Also, (since flow bench numbers WILL vary between different ones) what does a stock VIII or IX head flow on THIS bench? your cnc VIII/IX flow? Have you put any K series honda heads on this bench and what did they flow?

I am just curious as to how the new X's head design is compared to the others.

 

Yes, before and after flow bench would be nice... even nicer would be comparo of a cnc ix head vs x on the same bench.

 

Wow I want this done on my cars Nice work yet again from AMS

 

How much and how long?

 

IMHO the real question is, what whp gains will the CNC head produce relative to the OEM? What are your expectations? 10-15whp gains or more? That aside, bench flow differences would be informative.

Later, Ken
AMS intake&xhaust
Iveytune (322 all around)
Robispec K&W

 

This is the early stages guys. we will be posting before and after flow bench testing once we have it. In the meantime you can read all about what we gained from an EVO VIII head here: http://www.amsperformance.com/store/...oducts_id=2020

 

Thanks Eric for the info especially the nuiance regarding "balancing" the flow throughout the entire range. That said, I assume the flows in this head are (1) greater than OEM head and (2) the whp gains as well. Could you give us an idea of the whp gains relative to OEM for the EVO VIII head? That is, what did the increased flow that AMS has documented result in power output? Realize X results are apparently down the road but you must have info for the head on the VIII in terms of whp gains. Thanks for the information!

Later, Ken

 

Sure Ken, We actually have a couple of threads dedicated just to your question here:

https://www.evolutionm.net/forums/sh...hlight=ams+cnc
https://www.evolutionm.net/forums/sh...hlight=ams+cnc

Also be sure to check out our video on how these heads are made here: http://videos.streetfire.net/video/A...ead_200912.htm

 

FAP FAP FAP FAP I'm all over the place now.

You guys should offer a free box of shop towels when posting threads like this!

 

Nice work guys!