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Opinions of/experiences with these heads?

Beyond being rather expensive, what are the advantages/disadvantages of the CMW billet heads?
Old 02-18-2007, 02:59 PM
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don't have any numbers yet but will soon
my friend/turbo guru just finished a 3.3 with cmw heads, 3.6 intakes, b+b headers/muffler, k-27, with tec3r running the motor
engine is running so should have some dyno numbers soon
my motor build should begin shortly (also using these heads although with diff. other variables so should have more data)
I can say the design looks good
the key to these heads is the D shaped exhaust port
this speeds gas exiting chamber and allows you to run as big an intake port as possible
there are also some other cool tricks like the "holy" valve retainers
if you do buy a set make sure to inpect and clean up the finish work. my heads have many small metal burs
will keep you posted
john
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Old 02-20-2007, 07:34 AM
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How much were they, I want a set more than I want a set more than anything.
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Old 02-20-2007, 02:31 PM
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When I bought them they were 3k for a set (although I had to wait quite a while for them to send them to me)
I was going to port polish my stock heads and one of them was junk so it made sense
The other thing I forgot to mention about them is that the valves are huge
john
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Old 02-20-2007, 03:52 PM
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Ahhh.... I cant take it any longer. After this season I will force myself to buy a set! How much do you think I could get for a set of 3.3 heads ported to match 3.2 specs. Porsche motorsport valve springs and low miles on new valves and guides. Do you think I could get at least half of what those heads cost?
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Old 02-20-2007, 06:41 PM
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There was a thread not that long ago on the engine rebuild forum about these heads. The pics posted were not too impressive. There was not any real hard data about pefromance, but the finish work was pretty suspect....

Not to say they are not a good design........

Cheers
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Old 02-20-2007, 10:20 PM
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Yes, I was involved in that thread and had already talked to CMW beforehand about ordering a set for the turbo engine. After seeing the photos, I came upon some hesitation. I think when its time for me to make the final decision, I might email them the pictures for comments.

The price is listed on the website, but they tend to range now 4500-5000 for a set now. They sure look like the hot ticket at about half 9meister's. Just wish they would slow down the tooling on the CnC machine. I have some AFR products that are like CnC machined, but are much finer machined in and outside the ports.

I'd love for someone to follow up later and give real feedback and area under the curve dyno numbers. 930gt, If you go this route a before and after dyno session would be extremely interesting. I don't know why CMW doesn't offer anything more than flow numbers. Flow numbers are reflective but not 100% tied to power production.
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Old 02-21-2007, 02:22 PM
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I really want to do a set to my slant nose but do not have the ching right now. I am trying to get my father to get a 97' C4S for himself so we could turbo it and in which case I would MAKE him buy a set for it. If he gets the car and I install them, I will let you know. My alterier motive is to get him to grab me a set in exchange for pulling/installing the motor and managing his car for him. He is older and dont want to be bothered with the little details so Im sure I can convince him to do so.
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Old 02-21-2007, 02:55 PM
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Luke, any pics of these heads ?
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
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Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
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Old 02-22-2007, 02:05 PM
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Intake for 3.8
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72 RS spirit 2.7mfi, 73 3.2 Hotrod on steelies, 76 993 3.3efi TT, 86 trackrat, 91 C4s widebody,02 OLA winning 6GT2, 07 997TT, 70 914 v8

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Old 02-22-2007, 07:09 PM
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After viewing the images and unless things change drastically, there are no CMW heads in my future. This board is priceless.
Old 02-23-2007, 08:26 AM
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How about a set of heads with 52mm and 44mm valves?

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Old 02-23-2007, 09:26 AM
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Are you selling this set?
Old 02-23-2007, 09:38 AM
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Quote:
Originally posted by jrottn
I can say the design looks good
the key to these heads is the D shaped exhaust port
this speeds gas exiting chamber and allows you to run as big an intake port as possible
there are also some other cool tricks like the "holy" valve retainers
Had a friend who bought/used a set of these in the early 90's on a N/A RS clone w/a big bore 3.0... seemed to be real pleased with them although no data available.

Also heard that the "D" shaped exhaust port was part of the hot lick on these heads...supposedly CMW offer a "D" port insert, not sure if they still do.

Have heard mixed reviews on the "holy retainers" something about too much oil run-off..

P-
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Old 02-23-2007, 12:27 PM
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Thanks for the link Luke. I agree, they don't look very good. They look cheap.

If they skimped on the machining, I wonder about the metallurgy...
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 02-23-2007, 01:50 PM
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AFR who does domestic engines with ports left in "as is" condition from the CNC machine has done some tests and has found the texture left behind can be improved with hand porting but only slightly. BUT look at Air Flow Researches website and the quality of machining....it doesn't look like the photos in that link.

I'm still not completely turned off to them as they've been around for sometime and have been used on some serious race cars. BUT I'm sure more skepticle and will need to do more research before I write a check. I'm also looking into alternatives where before I felt this was MY obtainable Holy Grail. I'm not going to dig as deep as 9Meister though they are likely worth the money on the right project.......sadly not mine!
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72 RS spirit 2.7mfi, 73 3.2 Hotrod on steelies, 76 993 3.3efi TT, 86 trackrat, 91 C4s widebody,02 OLA winning 6GT2, 07 997TT, 70 914 v8

http://www.hubgarage.com/mygarage/LukeSportsman
Old 02-23-2007, 06:44 PM
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F*^% it, next season im going to put as much money as I would have spent on those heads into bigger , titainium, small stem 993 valves and a port job. I do like their titainium perorated spring retainers though.
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Old 02-23-2007, 06:49 PM
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