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May 8th, 2010, 12:41 PM   #31
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Re: Billet cylinder head

Originally Posted by Smorgasbord
Have you considered a Ludwig Apfelbeck type valve arrangement?, or is it far too complicated?
My general idea is to introduce common, modern, racing head design into a 1-cylinder light weight application. The porting, intake/exhaust system design, valve timing and combustion chamber are not far from what can be found in contemporary succesful engines (fx Ducati 1198, BMW 1000RR) with some F1/Top Fuel derived flow dynamics added to it. There must be some good reason why there are no "Apfelbeck" head designs and no rotary valves in F1.

The electropneumatic actuated valves have caught my eye though. Imagine being able to control valve timing AND lift from an engine control system! No further need for a throttle interfering with the flow and optimal valve timing through-out the range. The flip side is that you will have to carry/power a 15bar air compressor...

If this project turns out well, I might add a servocontrolled velocity stack, adapting the intake length to fit all through 4500-9000rpm. Manufacturing a DOHC-head, fuel-injecting it and getting to help me lower my lap times, is challenging enough for a hobby-tuner!
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May 8th, 2010, 03:20 PM   #32
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Re: Billet cylinder head

Dr_C your new head looks amazing. Can you tell me what brand/model EFI computer and Spark Control box you plan to use in your machine?

That W-9 motor on the atomracing site is also a good looking bit of gear. With that intake manifold and the injectors up nice and high it looks like it is designed to spend most of it's time up there in the 12,000 RPM range.
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May 9th, 2010, 08:39 AM   #33
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Re: Billet cylinder head

Originally Posted by Davo
Dr_C your new head looks amazing. Can you tell me what brand/model EFI computer and Spark Control box you plan to use in your machine?
Thanks Davo! There is still quite a journey before it is bolted together and performing up to specs!
I'm using a Microsquirt control box for the fuel injection and ignition. I purchased it, together with most of the sensors, from DIY Autotune. This company retails Megasquirts range and sensors that are fitting their control boxes.
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May 17th, 2010, 12:34 PM   #34
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Re: Billet cylinder head

Look what just came out of the 5-axis CNC mill of Mossbergs Mekaniska!

A kitchen table!!!!

I have mounted the throttle body, velocity stack and fuel injector holder that I intend to use.

For more photos, see my gallery!
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May 17th, 2010, 12:42 PM   #35
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Re: Billet cylinder head

thats a beauty Mats.

regards

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May 17th, 2010, 01:16 PM   #36
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Re: Billet cylinder head

I have hold it in my hands, and a can say that even those picture from my kitchentable cant give it justise how beautiful it is in reallife, how every detail is made with both function and great desingn in mind, and machining. I told Mats when we looked at it. If our wifes just would understand how a man that appreciate this kind of piece feel when touching it, turn it aroud, look at the detail in closeup, it would be like cheating, like have a nakedgirl lying on the table, thank good they dont understand Its a Masterpice.

Regards
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May 17th, 2010, 02:29 PM   #37
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Re: Billet cylinder head

Originally Posted by swedishsteel
I have hold it in my hands, and a can say that even those picture from my kitchentable cant give it justise how beautiful it is in reallife, how every detail is made with both function and great desingn in mind, and machining. I told Mats when we looked at it. If our wifes just would understand how a man that appreciate this kind of piece feel when touching it, turn it aroud, look at the detail in closeup, it would be like cheating, like have a nakedgirl lying on the table, thank good they dont understand Its a Masterpice.
ahh now i see the positives to the wife not understanding when I show her the husaberg engine parts

I think if I bought a DrC head though she might notice some money missing and my huge smiles etc and ask me if i had paid a pro for sex or something

my freind married a girl who appreciates this stuff but he's allways in trouble for wreaking (riding) her bike

DrC what is the head volume ?

I should have asked a month ago but I noticed today the cooling passages for the stock head don't really line up optimally with the block, the holes in the block are further away from the bore. did you get the cooling passages in the head located further away from the liner?

just wondering as with the 105mm bore there is not much room to seal between the bore and the cooling passages in the head.
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May 17th, 2010, 05:30 PM   #38
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Re: Billet cylinder head

just wondering why you have stuck with the 2 exhaust ports outlets dr-c?
i see most of the later ktm's/husabergs & jappers have just a big single port redirecting the exhaust out to the one side.
any reason or theory which is better?
..weed..
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May 17th, 2010, 10:56 PM   #39
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Re: Billet cylinder head

frame tube! if this is to have any commercial pretensions then the twin port has to continue!

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May 17th, 2010, 11:32 PM   #40
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Re: Billet cylinder head

to get the true benefit of DOHC i'd have thought the 550 bottom end with 108mm slug on it or even the old 400 crank with the 60mm stroke.

the ducati uses 60mm i believe.

I had nearly the first ducati pantah in the country in 1980 and it was 74 x 58 for 500cc. they later bought out a 583 with a 80mm bore and a 598 racer that was 81mm.

then they went to 82 x 61.5 for a cagiva and that became a 88 x 61.5 for a 750 racer.

when the 851 came out with essentially the same bottom end as my 500 but with a water jacket, 4-valves, DOHC, Fi, it was something like 92 x 64. they then made that a 916, 950 and 996 by going out to something like 110 x 64.

i don't actually know the water-cooled stuff coz i no longer follow that stuff but i did notice a month ago that the 1200 is something like 125 x 60mm. that's back to the stroke of a 500 or the 175 from the 50's.

it's grown 2" on the bore and barely moved on the stroke.

i could say more but getting comment out of mats is hard enough without pissing him off deliberatley.

regards

taffy
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