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Author Topic: New cylinder heads  (Read 18255 times)
Tobi/DFL
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« on: January 30, 2012, 16:06:18 pm »

Hi,

maybe there will be a new aftermarket cylinder head for oxyboxer and/or 4" bore conversions available very soon. The first batch of 3 pairs (edit: 4 pairs) have just been finished on the CNC mill and the first set will be tested on an 86x100mm oxyboxer this spring.
The heads are constructed by Thorsten Pieper from germany (some of you may know his tool steel type 1 lifters and dry sump oilpumps...) and are completely CNC milled. These heads are aimed especially for street use so they are extensively finned and there are air channels between the ports as well. They feature a o-ringed cosworth style inlet flange, 50cc combustion chambers, twin spark ignition, and a maximum of 50x40mm valves is possible.
Thorsten isnīt sure if there will be more sets made but if you are interested in a set I can forward you with his contact details (PM please).
What do you think about it?  

Bye,

Tobi

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« Last Edit: February 02, 2012, 08:28:48 am by Tobi/DFL » Logged
Tobi/DFL
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« Reply #1 on: January 30, 2012, 16:11:22 pm »

More pics...

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BeetleBug
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« Reply #2 on: January 30, 2012, 16:11:46 pm »

They sure looks nice. Any CFM numbers and price?

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Tobi/DFL
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« Reply #3 on: January 30, 2012, 16:16:21 pm »

No, unfortunately not...at least not at the moment - sorry!

Some more pics...

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Tobi/DFL
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« Reply #4 on: January 30, 2012, 16:19:49 pm »

And the last two pics.

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Shag55
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« Reply #5 on: January 30, 2012, 16:28:26 pm »

Vary nice!
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Fasterbrit
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« Reply #6 on: January 30, 2012, 21:21:20 pm »

Wow!  Shocked
They belong in the Tate Modern  Cool
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bedjo78
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« Reply #7 on: January 30, 2012, 23:04:13 pm »


wooowww ....  Shocked
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« Reply #8 on: January 30, 2012, 23:24:26 pm »

I like the way they glow blue from certain angles, cool  Roll Eyes
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bilboa2
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« Reply #9 on: January 31, 2012, 02:22:51 am »

NICE, VERY nice.. ok texas tom, better place your order soon..
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wph
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« Reply #10 on: January 31, 2012, 10:02:49 am »

Even more intresting if you could order them with custom CNC- program for different valve, spark plug locations (bigger intakes) and bolt patterns.
This might be the ultimate head configuration for big cc N/A racing engines, definitely thumbs up. Not interested in relocating intake and exhaust guides for cast production heads. Add enough material for extreme porting and consider them sold Smiley  
« Last Edit: January 31, 2012, 10:07:49 am by wph » Logged
Greg Ward
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« Reply #11 on: January 31, 2012, 11:43:26 am »


Hi Tobi,
Can you define "twin spark'?

Not sure what you mean, I sort of see 2 possible holes for 2 sparkplugs per cylinder, but then no extra plugs in pictures, and If i'm looking correctly, the plugs would be next to each other in the same side of the cylinder?

Please correct me if I'm totally off base.

thanks,

Greg
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Tobi/DFL
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« Reply #12 on: January 31, 2012, 11:58:23 am »

Hi Greg,

just have a look at the 3rd pic and you can see the position of the two spark plug holes in each combustion chamber. But you are right: thereīs just one sparkplug installed in the pic. Wink
BTW: the pics donīt show the final finish of the heads. After the milling they are glass blasted and a final anodizing is possible as well.
Thorsten decided to have a fourth pair machined in the first batch as he had ordered two spare aluminium blocks just for the case that anything would have been wrong with with the first heads. Fortunately everything was fine. Smiley
On the attached pic you can see all eight heads of the first batch. The pair on the left is already glass blasted.

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Bye,

Tobi
 
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Shag55
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« Reply #13 on: January 31, 2012, 18:52:38 pm »

These heads are defenatly top notch! The ultimate Daily driver head.
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325hp and 290# torque @17psi on 91 pump
383hp and 324# torque @23psi on 50/50 mix
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Shag55
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« Reply #14 on: January 31, 2012, 18:54:42 pm »

I'd say make the shafts split per cylinder and 3 studs each that would be perfect.
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325hp and 290# torque @17psi on 91 pump
383hp and 324# torque @23psi on 50/50 mix
Shag55.sl1racing@gmail.com
Facebook at SL 1 racing
58vw
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« Reply #15 on: January 31, 2012, 19:25:34 pm »

nice Grin
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Martin Greaves
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« Reply #16 on: January 31, 2012, 19:41:52 pm »

Nice heads. Smiley

I take it they are being send to the US for independent testing. As they have been make over here in Europe and we don't want OC67VW coming along saying they are not going to work as good as the originals. Tongue
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Tobi/DFL
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« Reply #17 on: January 31, 2012, 20:42:32 pm »

Sure! Grin
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kafercup
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« Reply #18 on: February 01, 2012, 05:47:38 am »

Beautiful!!  It's great to see that so much innovation is happening recently.   Cool
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181
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« Reply #19 on: February 01, 2012, 14:08:36 pm »

Which rocker layout will they use?
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Roman
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« Reply #20 on: February 01, 2012, 22:58:51 pm »

They look very nice, but the chamber needs some work in my opinion.
What aluminium quality has he used?
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Type1/DVK
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« Reply #21 on: February 01, 2012, 23:10:59 pm »

Looking nice! it's only a 'raw' cnc cutout Roman i think..  Wink
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Tobi/DFL
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« Reply #22 on: February 02, 2012, 08:10:01 am »

Which rocker layout will they use?

Hi,

as mentioned above these heads are primarily a private project which does not necessarily get marketed so these heads are no "plug&play" deal! The heads that are done right now will all receive stock style rockers (2-bolt design) but looking at the material left in the rocker arm area (sorry, I donīt know the right word for it) it should be possible to mount others like JPM rockers but that all would require machine work.

Thorsten wants to test these heads very soon on the streets - that means long distance autobahn driving with top speeds above 180km/h for him! Grin - and if they should work (regarding power, cooling and reliability) he will maybe make some more of them (complete sets with seats, valves etc. or maybe bare as well) if there should be enough interest.

Tobi
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Tobi/DFL
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« Reply #23 on: February 02, 2012, 08:17:41 am »

They look very nice, but the chamber needs some work in my opinion.
What aluminium quality has he used?

Hello Roman,

what exactely would you change on the chambers? Thorsten asked a lot of different tuners (Porsche, VW, jaguar, BMW motorcycle...) about their opnions in chamber design and the results can be seen on the pics. We will see if it works... Wink

But of course these heads - like any other head - can be further worked on by hand! In fact there is still some handporting left! At least to remove some marks on spots that the mill didinīt reach perfectly.

The aluminium quality is sort of a secret, yet but I will ask Thorsten if itīs okay to post it here.

Tobi
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Tobi/DFL
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« Reply #24 on: February 02, 2012, 08:24:01 am »

Yesterday I received my pair of heads which will be used for my next engine (86x101,6mm oxyboxer).
Attached are some more pics of the heads.

Tobi

[ Attachment: You are not allowed to view attachments ] Bore is 108mm
[ Attachment: You are not allowed to view attachments ] This shows where the second plug is placed
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Jesse/DVK
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« Reply #25 on: February 02, 2012, 10:04:25 am »

Wow they look awesome! Very happy with my TP lifters and it's very cool to see a privateer come up with these heads.
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Der Vollgas Kreuzers
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« Reply #26 on: February 03, 2012, 11:39:27 am »

I have a wbx case for sale , ready for aircooled . If someone wants it ....ready to go with type1 lifter bushings

Udo
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-Alex-
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« Reply #27 on: February 17, 2012, 12:09:31 pm »

I have on the build also 4" bore engine, TF-1 case, 88 stroke and nickies.  This head is another excellent choice, firstly i was thinking to use JPM heads.

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morkrieger
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« Reply #28 on: February 27, 2012, 00:17:13 am »

Very nice work!

scary i modelled about the same head design in CAD/CAM last year for virtual prototyping, seems like the need is there.

If you are interested in 'matching style' valve covers, contact me,i might have something very interesting to offer.  Cool

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SB40plus
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« Reply #29 on: October 28, 2012, 18:36:06 pm »

Bump or whatever... Looks awesome! Any news?
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