Each valve seat is cut to the same depth perfectly in the Serdi machine. This is way better than an old-fashioned drill press or even a handheld cutter with cutters or stones for each valve angle. The old way required skillful, time-consuming, and tedious work to do a good valve job. The Serdi knocks out perfect valve seats each time quickly.
Here is the Serdi at work cutting a seat.
And here is the seat with a perfect 3 angle cut with the CNC finished port perfectly blended to the valve seat. This would normally take hours of craftsman handwork.
Here are our perfect CNC cut and blended valve bowls and seats with perfect Serdi 3 angle valve jobs, it’s a thing of beauty! To make things even better, by the time you read this IAG will have gotten their Newen CNC valve cutting machine going to make perfect radius valve jobs. This is state-of-the-art and how we have our own MotoIQ in-house valve jobs done.
The CNC ported intake ports are nicely shaped with a straight shot into the valve bowl. Look at the perfect finish and symmetry in between the two intake ports. Every IAG head will be like this one, the next one, and yours!
16 comments
“Cast iron cannot be used with stainless steel because of its tendency to gall.”
I had to look that up, because I didn’t think that it would be a good combination of metals together for a valve guide, but didn’t know for sure.
Is the dogleg on the exhaust port the reason for the famous ‘Subaru Burble?’
No, it isn’t, it’s the unequal length exhaust and cylinder pairing.
Can’t the exhaust system account for the unequal length and cylinder pairing?
That is the exhaust system, if you do an equal length 4-1 the motor sounds more normal.
Kudos on torque-plating the head for a valve job. One step further would be to CNC-machine the whole combustion chamber. The as-cast chamber is pretty consistent but i´ve seen irregularities of up to 1,5cc on some Japanese heads.
yes, we found the same
What are the chances that IAG will add the WPC treatment as an option for their motor builds? I’m assuming that for now there would be some level of management that the custom would have to do between WPC and IAG to get the parts treated before assembly etc.
You would have to ask them, they were impressed with the WPC parts but it would add considerably to the cost of a build because of shipping and time delays.
Are the valve stems treated for wear, such as chrome plating or nitriding? If so, does the WPC process affect that treatment negatively?
The exhaust valves are chrome and the intake is nitrided. It won’t affect them.
I’m impressed the valve clearances can be computed and they are all the same.
I’ve seen a couple companies in Germany offering CNC golf ball machining to the intake valves. (@ngmotorsports on Instagram). Do you think this would make any difference to the flow based on golf ball aero principles? I haven’t seen them release and benchflow data.
I personally think it’s not worth the effort in a general sense. In some cases, you might want to thicken the boundary layer in some places to improve velocity.
nice build
too bad you miss a few important things
only real subie builders know
Like what? We are real engine builders and IAG is one of the best Subie engine builders in the country with a winning track record in actual competition.
Get real ken. Fess up.