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January 4th, 2010, 10:54 AM   #1
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Billet cylinder head

Hello people!
The cylinder head has got a couple of seasons track record with very good results (winner of the Nordic Supermono Cup 2009) with high power and outstanding reliability. However, if I would have done it today, there are still some things I would change for even better performance. I'm planning to manufacture another 2 pieces for myself. They will have:
-OEM positioning of the exhaust valves (keeping OEM rocker arm)
-32-32,5mm exhaust valves and porting/aligment to use any after market exhausts
-Repositioned 40-41mm stainless inlet valves, including billet rocker arm (OEM rollers and adjustment screws)
-OEM valve guides (upgraded with liners), rocker shafts, valve cover etc

The cost will be possible to reduce if making more than just a couple. I guess it will be less than 2000€, but that has to be calculated once knowing how large the "series" will be. Keep in mind that you will also need a larger carb (45-50mm) to get value for the investment. I you feel restricted to the 41mm, my financial advice to you is to buy beer or fire crackers instead.

So if anyone of you guys thinks this sounds interesting, send me a PM and I'll keep you updated! If I get around 10 orders, the cost can really be reduced!

/Dr_C (speciality: Breathing)
See my gallery for pics, Dr_C is quite logically sorted in the "S"-section
Thanks from tourist
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January 7th, 2010, 02:55 PM   #2
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RE: Billet cylinder head

Hi Dr-C sounds very nice

just bumping this back to the top of the page, i'm interested but I have to kick my firecracker and beer addiction before I can afford one.
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January 8th, 2010, 01:41 PM   #3
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Re: RE: Billet cylinder head

Originally Posted by bushmechanic
Hi Dr-C sounds very nice

just bumping this back to the top of the page, i'm interested but I have to kick my firecracker and beer addiction before I can afford one.
I'm thinking a test ride on my bike would be the best rehab for your current addiction. Any side effects? Well, you will probably get indifferent to normal commercial motorcycles...
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January 9th, 2010, 01:51 AM   #4
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RE: Re: RE: Billet cylinder head

out of my league at this point. i've seen your figures for the power Mat and they are impressive.

regards

Taffy
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January 10th, 2010, 09:26 PM   #5
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RE: Re: RE: Billet cylinder head

I'm thinking a test ride on my bike would be the best rehab for your current addiction. Any side effects? Well, you will probably get indifferent to normal commercial motorcycles...
done! sounds good, I stopped looking at jap 450s a few years ago, your machine could crank up the difference quite a bit
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January 23rd, 2010, 04:42 AM   #6
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Re: Billet cylinder head

i see that on the web,
a cnc head!

http://www.topplocksverkstan.se/referenser.html
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January 23rd, 2010, 04:01 PM   #7
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Re: Billet cylinder head

Correct!
Erland Cox at Topplocksverkstan has done all porting jobs for me. Very experienced and can make a 450, Chevy big block, Fiddy, or whatever with an Otto-motor, go fast.
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January 24th, 2010, 03:37 AM   #8
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Re: Billet cylinder head

a question:
why no 2 camshaft?
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January 24th, 2010, 11:50 AM   #9
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Re: Billet cylinder head

Originally Posted by contiman
a question:
why no 2 camshaft?
Because I have a normal day job to attend to.

That would have called for a solution like Folan/Highland, or a conversion to belt driven cams. Maybe I'll settle with making the head taller, decreasing the valve angle and making the ports more straight. I can allways have me a special cam ground to get more lift and a nice difference between duration in/ex as normal race engines have.
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January 25th, 2010, 08:32 AM   #10
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Re: Billet cylinder head

It is an option, in my opinion
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