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March 30th, 2010, 11:40 PM   #21
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Re: Billet cylinder head

Originally Posted by bushmechanic
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?
Thanks Bushie!
The oil comes into the cylinder head at the rear left corner as normal, then exits to a hose that feeds both cam shafts through their right side end. The lobes are drilled on the "back side". Cam shafts are supported by needle bearings (DxdXW, 22x16x12mm) which has not been an issue on the Folan/Highland engines. This lets me use larger diameter camshaft body (less bending) and keeps the external dimensions of the cylinder head down.
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March 31st, 2010, 05:48 AM   #22
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Re: Billet cylinder head

sounds good

FWIW the new KTM engines that use a large diameter needle roller on the cam are having some fail, not sure why exactly but roller speed is up on the bigger ones, yours (small OD) sound good.

looking forward to the next cartoon
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April 3rd, 2010, 03:43 AM   #23
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Re: Billet cylinder head

nice job
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May 4th, 2010, 12:52 PM   #24
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Re: Billet cylinder head

Hi guys!
Thought I'd keep you posted on the progress. Most of the Folan head internals have arrived. The camshafts were particularly fun to see, as they are a new design. The duplex gear (chain, tooth gear), driving the cam shafts is ready for hardening. The weekend was spent on wiring looms, sensors and brackets for the fuel injection system. Without the dedicated support from Patrik "Swedish Steel" Eriksson, this project would never have come this far!
Hopefully the machining of the head itself will be completed the next coming days.
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May 4th, 2010, 11:08 PM   #25
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Re: Billet cylinder head

something new for you to read in the next 24 hours. I'm doing a thread on the sherco stuff again Mats.

regards

Taffy
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May 7th, 2010, 01:34 PM   #26
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Re: Billet cylinder head

Goodies are arriving!

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May 7th, 2010, 03:22 PM   #27
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Re: Billet cylinder head

Nice Dr-C!

profile looks ahm pretty aggressive
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May 8th, 2010, 12:57 AM   #28
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Re: Billet cylinder head

it's like going 300 miles to the beach one day and being told by your dad that you've got to turn straight round and go home again!

regards

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May 8th, 2010, 06:26 AM   #29
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Re: Billet cylinder head

Originally Posted by bushmechanic
Nice Dr-C!

profile looks ahm pretty aggressive
"Looks" I believe is the key word here. Direct acting lobes are looking meaner than ones with rockers. The inlet cam (see picture) is lifting 13,0mm, duration is 270 deg measured at 0,050" (1,27mm) with 0-play. So duration is more or less equal to OEMs, but the max lift is increased to fit the 41mm inlet valves.

My machinists 5-axis CNC mill had a problem with a position sensor, so machining of the cylinder head has been delayed. The first race is taking place next weekend, so the old billet head engine will have to do!

There is still a lot of work to get the whole package together but I'm more than halfway around the lake so I'd better roll up the sleeves (one more time).
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May 8th, 2010, 10:57 AM   #30
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Re: Billet cylinder head

Have you considered a Ludwig Apfelbeck type valve arrangement?, or is it far too complicated?
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