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CB's CNC heads

FM Former Member
Anybody use, seen these things? In there advertisement they say something about 205cfm @ 25". What the hell does that mean? I know that's flow but how do you compare that?

Anyway these heads look really cool. I love the idea that a five axis mill ports them out and that the ports are reproduceable. I've always felt that regular ported heads are something that could flow great or not , it just depended up what type of day the head porting guy had (wether the guy doing the port work had a hangover or not). I'm just happy to see that VW performance is finally getting into the 21st century.

Does anyone have any ideas on these?

J-P
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FM Former Member
Anybody use, seen these things? In there advertisement they say something about 205cfm @ 25". What the hell does that mean? I know that's flow but how do you compare that?

Anyway these heads look really cool. I love the idea that a five axis mill ports them out and that the ports are reproduceable. I've always felt that regular ported heads are something that could flow great or not , it just depended up what type of day the head porting guy had (wether the guy doing the port work had a hangover or not). I'm just happy to see that VW performance is finally getting into the 21st century.

Does anyone have any ideas on these?

J-P
FM Former Member
Seems really strange to me that the combustion chambers are different. I would think that it would take less programing of the machine to configure one chamber then copy the data for the rest. Is 185-190 cfm good? I'm not sure what is considered good foe a street head. Just wondering, what made you purchase these heads verses others out there?

I also read somewhere that heads need to be reworked between 35k-50K. What fails in the head that causes a rebuild?
If this is true why wouldn't a person use 94's? By the time the heads die so would the cylinders.
J-P
FM Former Member
It would be fun to design a set of heads for a VW. I could scan the head then sculp the head in a CAD program using the fluid dynamic program in Catia ( same software to design cars and jets). After that there are 3D printers (otherwise known as SLA) that can reproduce the head in AL with no machining needed. All I need is the time and about 10k for the SLA. Oh the dreams!

J-P
FM Former Member
Aircooled heads are the hottest part of the motor. Top ends just go early. The valves start needing notable adjustment every 3000 miles, and if you let them keep it up, the valve winds up stretching, not seating properly, getting hotter than heck, and then if not repaired, they may drop a valve head on top of the piston and it's all over but the towing and crying. On the 94 observation, that's exactly where I've come down to. 94s should hold up for 60 or 70k, and they are cheap so why not build for a 94s motor???
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