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8 Port 998Cc Cnc Machined Billet Head And Collectors


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#16 Elmtech

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Posted 27 April 2012 - 10:01 AM

The flow rate is only one component that affects performance. Taking advantage of the pressure pulses with a correctly tuned exhaust is also very important, and that's the reason we went with the separate ports design. Our goal is to get maximum hp. We made the push rod holes slightly smaller too to give more room for the exhaust, so there is no reduction in area.

I haven't mentioned the collectors yet that we will be selling, but here are a few computer rendered images showing what they will look like. They will be machined from a solid piece of steel or stainless steel. The one rendered here is for 33.7mm primaries(29.7mm ID), and for a 2.5" exhaust. But we'll be able to machine almost any combination of sizes.
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#17 kcchan

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Posted 09 May 2012 - 10:38 PM

Wow, how much are the collectors likely to be?

#18 miniallsort

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Posted 11 May 2012 - 12:27 PM

looks good

#19 Mini Mad Drakeley

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Posted 11 May 2012 - 01:45 PM

mmmmmmmmmmmmmm :wub:

when im able to save up enough i think im definitely getting this for my 998 :wub:

Edited by Mini Mad Drakeley, 11 May 2012 - 08:45 PM.


#20 chrisj

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Posted 11 May 2012 - 02:15 PM

Wow!

Looks fantastic and lets hope it performs just as well.

Would be very interested in a 998 head in the near future.

Chris

#21 Ethel

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Posted 11 May 2012 - 02:32 PM

Hopefully I'm being very stupid, but where's the valve gear go?

#22 adam davies

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Posted 11 May 2012 - 04:25 PM

That is some sexy piece of kit O_O It's starting to give me some ideas after I finish my current project

#23 kcchan

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Posted 11 May 2012 - 07:32 PM

Hopefully I'm being very stupid, but where's the valve gear go?


The one in the photo may not be finished.

#24 cradley-heathen

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Posted 11 May 2012 - 08:40 PM

i think this is fantastic! we should be trying to make the most of 998 engines, the 1275 stuff is well catered for already.

should be a really revy engine when finished, i cant wait to see it running.

keep up the good work!

#25 Elmtech

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Posted 11 May 2012 - 09:55 PM


Hopefully I'm being very stupid, but where's the valve gear go?


The one in the photo may not be finished.


That is indeed the case, we're currently working on a second head that should hopefully be complete in a couple of days, I will post some more pictures when it's done. You can just about make out the valve spring pockets in the first picture though, aluminum just gets pretty shiny when it's machined :D We also finished the design of a 1275cc version of the head, it will look pretty much the same, just slightly larger valves/ports of course. Getting the larger center exhaust ports to fit between the pushrod holes became a bit more difficult, but we found a solution and it should work nicely.

The collectors will be priced at roughly 200£, this will include custom primary/exhaust sizes(within reason). For a smallish additional fee we'll also be able to make versions where the primaries enter in different angles etc. Compared to welded merge collectors ours will have perfectly round exits and much smoother transitions, ie there are no straight parts inside the collectors, just continuous smooth shapes.

Edited by Elmtech, 11 May 2012 - 09:55 PM.


#26 JakeJakeJake

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Posted 13 May 2012 - 09:10 PM

looks great, is it thicker than a standard head?

#27 lucas1amps

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Posted 14 May 2012 - 06:41 AM

beautiful work looks amazing!

#28 Elmtech

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Posted 14 May 2012 - 01:15 PM

looks great, is it thicker than a standard head?


It's 70mm thick which should be more or less the same as a stock 998/1275 head. The "ears" where the intake manifold bolts on are a bit higher at roughly 75mm. It will work with standard pushrods.

#29 Wil_h

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Posted 14 May 2012 - 05:50 PM

Looks interesting, I run a CNC machined 7-port on a 998. How much of a water jacket have you managed to get in it?

#30 Elmtech

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Posted 14 May 2012 - 09:22 PM

Well, it has lots and lots of drilled holes. But basically 2 larger holes going through the entire head, and then smaller holes going around/between the ports. I don't think we're going to have problems with cooling it.




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