| [ Total Views: 1131 | Total Replies: 13 | Thread Id: 98756 ] |
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 bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
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| posted on September 11th, 2012 at 07:47 AM |
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Interesting 4 valve/cylinder type 1 style head.
Saw this and thought it was a pretty interesting setup to share. You'd want to have a fat wallet at $4400 starting price per pair. But uses stock
style performance cams, push rods, tubes, barrels, flat top pistons etc.
The volumetric efficiency benefit would be the saving grace for any super hypo engine i would assume.
here:
http://www.araoengineering.com/vwheads.htm
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
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reub
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| posted on September 11th, 2012 at 09:59 AM |
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http://www.youtube.com/watch?v=3KERkb7SaH8
Reub
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psimitar
Son of Jim - Creator of Good
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| posted on September 11th, 2012 at 11:34 PM |
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That video is mentally funny  
madness is in the eye of the beholder  |
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waveman1500
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| posted on September 12th, 2012 at 12:08 AM |
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What a hideous rocker arrangement for the second set of valves!
Double the rockers, double the friction/wear points, double the mass. Those heads are huge chunks of metal too, and it doesn't look like they'd cool
too well. Not for me thankyou. A very interesting exercise though, to try and cram four valves per cylinder into a pushrod engine.
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vassy66T1
A.k.a.: Marcus Vass
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| posted on September 12th, 2012 at 06:41 AM |
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I did notice revs did not go too far past 6K. Must be hell on pushrods
(unless my labrador is deceiving me)
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vwo60
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| posted on September 12th, 2012 at 07:11 AM |
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It would be two cartons to do the tappet clearence, you would have to juggle two feeler gauges.
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 matberry
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| posted on September 12th, 2012 at 08:08 AM |
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Interesting. Don't think I'd bother either. 2332 making 235
Now compare with a JPM 1915 making 248
http://www.youtube.com/watch?v=JtpzA0hd8Kg
AND ONLY 2 VALVES per cylinder
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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psimitar
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| posted on September 12th, 2012 at 01:52 PM |
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Ah but you would have to compare cam and gasflow specs to draw a better comparison.
Still that rocker arrangement is poorly designed. Could think of better solutions myself but any pushrod engine is hard to make 16v properly.
madness is in the eye of the beholder |
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vlad01
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| posted on September 12th, 2012 at 02:48 PM |
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these heads= what a waste of time and effort.
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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tar76
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| posted on September 12th, 2012 at 04:25 PM |
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that JPM bug is a animal 
"Obey your Dreams"!
62 Std beetle.
65 11 wnd Split "The Cross".
6? coming very soon!!!!
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Smiley
A.k.a.: Daniel Stephens
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| posted on September 12th, 2012 at 06:50 PM |
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I'm not sure why they have gone with such a complicated rocker setup.
The engines we rebuild at work are 4 valves per cylinder pushrod engines. They simply have a small metal 'bridge' between both valves and the rocker
arms pushes down on the middle of this opening both valves.
I'm not sure why you couldn't run a similar setup instead of all that extra crap.
The engines at work are low reving diesels though, they top out at around 2000rpm, and only make like 3500hp  So this setup possibly can't cope with revs.
Smiley 
If you said I was a Volkswagen man, you'd be right.
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ian.mezz
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| posted on September 12th, 2012 at 07:24 PM |
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there are pictures of one in the Hot VW and dune buggy .
http://www.hotvws.com/issue_previewLrgContents.html
there is also a video on their facebook page.
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matberry
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| posted on September 12th, 2012 at 07:34 PM |
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^^^That one is twin overhead cam, way better but mega work, interesting that it pulls 10500rpm also
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
The international telephone dialing code for Antarctica is 672.
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| posted on September 12th, 2012 at 07:48 PM |
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What i find exciting is simply the concept of the cross sectional area in total of the valves compared to 2 valve per cylinder.
You would hope the rockers were super light. Overhead cam would be fun for tuneability, i'd have to take a sticky beak :P
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears.
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
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