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January 30th, 2010, 05:39 AM   #11
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Re: Billet cylinder head

Originally Posted by contiman
It is an option, in my opinion
Definitely!
Would the interest be higher if I made a twin cam head instead?
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January 30th, 2010, 09:55 AM   #12
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Re: Billet cylinder head

wouldn't a KTM head fit straight on nearly? someone advised me a month ago that i should look at the head from the big KTM road bike. we have just had a road race series finish over here last season so i'd have thought a few spare parts were flying around?

thing is: can a husaberg crankcase take the stress?

regards

Taffy
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January 30th, 2010, 12:49 PM   #13
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Re: Billet cylinder head

the new ktm x-4 series dirtbike engines are supposed to have a head that flows better too or it may indeed be the same as the roadbike twin.

could even be the same as the new berg engine?

the x-4 is SOHC but has weird cambearings larg diam roller some have failed

I like the SOHC it keeps the engine shorter and overall COG down low
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February 6th, 2010, 02:23 AM   #14
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Re: Billet cylinder head

You guys mean something like this?
Unfortunately it' requires a "little" more work than just to bolt it on. This is a Folan cylinder head, the basic design behind Highland and what was supposed to be a Cannondale.

If lowering the exhaust cam, the overall height will increase 10mm on the exhaust side and 20mm on the inlet side, over the Husaberg OEM (pre 2009). Is there space enough for this in the frame? Maybe that is a hypothetical question, because the inlet will be downdrafted. That will most certainly make the carburettors (Yes, hopefully 2)interfere with the frame.

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February 7th, 2010, 02:59 AM   #15
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Re: Billet cylinder head

hey I like this pic and 10-20mm sounds ok

frame clearence Is no issue for me I have a 230mm grinder

only issue is price around 500 euros would be nice.
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February 7th, 2010, 04:09 AM   #16
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Re: Billet cylinder head

Originally Posted by bushmechanic
hey I like this pic and 10-20mm sounds ok

frame clearence Is no issue for me I have a 230mm grinder

only issue is price around 500 euros would be nice.
Large grinder you say, Bushie. I've learned from former US collegues that is called a "Widow-maker"
Handy, creative and committed people, like yourself, are a shrinking minority. The vast majority wants boxes labelled "70 RWHP", a 3-step assembly instruction and no need for tools other than normally found in a kitchen drawer. :P

With theese small quantities that price tag is impossible, I'm afraid. My existing billet head took a good 11 hours in the CNC-mill. Larger quantities will support the manufacturing of casting tools, which will reduce the machining dramatically. Then you need all the internal components (cams, sprockets, guides, seats, valves, springs etc etc)...

The Folan head will need too much welding and manufacturing to fit the Husaberg, in my opinion. That can be accepted for a test engine, not enough for providing the reliability you need to finish races. I will discuss the manufacturing with my machinist, the design of the ports/combustion chamber/valve lift/valve timing with my tuning guru and the access to internal components with Folan. If everything adds up, I will start producing a 3D-model.

You can see some of my machinist work at http://www.mossbergs.se. Tobias Mossbergs vocabulary does not contain the word "impossible". They have also machined the W9-engine which can be viewed at his brother in laws' site, http://www.atomracing.se. Mr Erland Cox at Topplocksverkstan provides with his vast tuning expertise, http://www.topplocksverkstan.se. All of them are within a 20km radius from my home, which makes thing a lot easier. So, we'll see what can come out of this!
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February 7th, 2010, 01:21 PM   #17
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Re: Billet cylinder head

very nice pictures on these sites and some great people to have close by

as far as machining expertise goes my widow maker is it here for at least 700km

whatever the head costs in which ever form Im sure its worth every cent and it looks like the engine needs more flow to be more userable if tuned, ive seen a flow chart where there are diminishing returns after 10mm valve lift on the stock head. more tourque spread over a wider range is what I'm chasing and you have that for sure.

thanks for those links very inspiring, one day I'd like to make up some cases from alloy/carbon, 2 planks alloy 25mm thick to house all the bearings machined to death to make them lighter and a carbon box section bolted between them to space it out. (like the french 2 stroke GP bike touloiee) great big alloy tube for the cylinder to house a wet liner but not vertically split. would be fun

but perhaps with
boxes labelled "70 RWHP", a 3-step assembly instruction and no need for tools other than normally found in a kitchen drawer.
I could get what im after needing only gable and messer but then 1/2 the challenge is making the thing in a dodgy old shed with grandads wonky south bend lathe.

pretty sure I can run it as line borer for the job hey I should make a cylinder head too, it seems more difficult though

please keep us updated on the heads I think I saw some cash in the kitchen drawer
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February 8th, 2010, 06:54 AM   #18
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Re: Billet cylinder head

I'd be concerned too if I have money when it is completed
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March 30th, 2010, 07:38 AM   #19
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Re: Billet cylinder head

The design is getting close to the finish. The intake and exhaust ports are still needing some attention. This is the specification for the project so far:
DOHC together with fuel injection
Inlet valves and timing: 41mm, 270 deg duration at 0,050", max lift 13 mm
Exhaust valves and timing: 33mm, 260 deg duration at 0,050", max lift 12 mm
Valve and porting config: included valve angle apr. 20 deg, inlet port appr. 50 deg to head gasket surface
Cam mechanism: OEM cam chain, upper sprocket and chain guides at OEM position (middle shaft exactly where OEM camshaft was positioned), tooth gear (1:1) at the middle shaft driving the camshafts, cam timing is fully adjustable (tooth gear on cones at the cam shafts)
Throttle body: from Ducati 848/1090/1198, 46x63,5mm, one injector placed outside bellmouth (possible to add one in the intake, sequentially controlled)
EFI: Microsquirt with broadband lambda and trigger on crank and cam, including ignition control wth separate coil

To make this fit on the bike I will manufacture a tank dummy and air box, new fuel tank above the gear box and probably lots of stuff I cannot grasp at the moment

I hope the pictures show, dispite my limited IT-skills...



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March 30th, 2010, 09:08 PM   #20
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Re: Billet cylinder head

Nice Dr-C!

fully adjustable cam timing without buying new lobes, proper cam chain and cam drive gear profiles not the silly plate ones.

its far too sensible just like the self cleaning design of a dogs er umm nuts ... so i probably don't think i need to ask but .... ball bearings on the camshafts ? splash lube or pressure feed?
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