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36 Rocker Art
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bvilletom
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PostPosted: Fri May 01, 2009 4:09 pm    Post subject: 36 Rocker Art Reply with quote

Here is a set of forged steel 1.3 to 1 rocker arms for a stock 36 or
Okrasa head. To get the proper offset the rocker shaft is handmade from
billet tool steel hardened to 60r then drawn back to 48r. This is designed
to be a performance replacement to fit directly in a 36hp head with the
stock pushrods, valves, and springs. The shaft was really hard to get all
the offsets built-in and still be able to get the rockers on and be strong.
We’re going to be testing these under racing conditions May 16th.

Bvilletom (Brukrasa)


Image may have been reduced in size. Click image to view fullscreen.


Image may have been reduced in size. Click image to view fullscreen.

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Last edited by bvilletom on Tue Jul 07, 2009 4:19 pm; edited 1 time in total
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grueni
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PostPosted: Fri May 01, 2009 5:07 pm    Post subject: Reply with quote

funny looks like the same i thought about when starting thinking about rocker ratio. but alot of work and i thougt about using stock rocker...weldet and then relocat the new holes.

am i right that this are the later intake rocker from 356/912 porsche?

beautifull work.


i also have a question to you tom PM

wishes from berlin
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Julio Iniguez
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PostPosted: Sat May 02, 2009 11:33 am    Post subject: Reply with quote

Very nice Tom!! Good luck on the test bed.

Julio
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Art Thraen
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PostPosted: Sun May 03, 2009 8:15 am    Post subject: Reply with quote

Nice PICs Tom.... These little engines are Fun... But hard to hopUP..

See you soon, Art @ ACE
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Glenn Premium Member
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PostPosted: Sun May 03, 2009 8:24 am    Post subject: Reply with quote

It's great to see all this performance stuff for the 36hp... it's about time.
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Louis
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PostPosted: Mon May 04, 2009 2:41 am    Post subject: Reply with quote

good job... will be waiting for those thats for sure!!
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Roadcow
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PostPosted: Tue May 05, 2009 8:14 pm    Post subject: Reply with quote

Nice work Tom.
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blacklineracing
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PostPosted: Wed May 06, 2009 5:01 pm    Post subject: Reply with quote

Very nice Tom,
we can't wait to see how they work for you
Justin and Colton
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Unkl Ian
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PostPosted: Sun May 24, 2009 10:26 am    Post subject: Re: 36 Rocker Art Reply with quote

bvilletom wrote:

We’re going to be testing these under racing conditions May 16th.



How well did they work ?
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Roadcow
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PostPosted: Sun May 24, 2009 1:07 pm    Post subject: Re: 36 Rocker Art Reply with quote

Unkl Ian wrote:
bvilletom wrote:

We’re going to be testing these under racing conditions May 16th.



How well did they work ?


They set a new SSS record of 90 mph.
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Unkl Ian
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PostPosted: Sun May 24, 2009 3:32 pm    Post subject: Re: 36 Rocker Art Reply with quote

Roadcow wrote:

They set a new SSS record of 90 mph.



Congratulations ! Very Happy
What were the arms for originally ?
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bvilletom
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PostPosted: Tue Jul 07, 2009 4:13 pm    Post subject: Reply with quote

Rest of the story:
Before we went racing we had to modify the rocker covers, the lower end
of the Porsche rockers at the screw top it hit the cover a lot. We made
little hand-hammered spoon-shaped covers & brazed them on which
worked fine. The racers say my covers have boobs now.

The high lift rocker set performed perfectly & made the engine much
more responsive. The valve lift went from about .295 to approx. .385 at
the valve. The ratio must be 1.3:1 or slightly more. Modified rocker
arms similar to Blackline type could also be used with the new shaft and
everything else stock.

Just a side note, I had a chance to take a road trip and got to visit
several 36hp LSR shops. Ronnies bus shop in AZ, Justin & Art (Blackline)
in Salt Lake, and Bruce Cooks in NC. I also got to meet Whitey Worsham
from NC, Cooks Cylinder head guru. We had a day to brainstorm36hp
heads with pictures and everything. Much fun, then back to my shop.

Bvilletom
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1992 Metro Sedan – 1 liter LSR records
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greggearhead
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PostPosted: Tue Aug 25, 2009 9:34 am    Post subject: Reply with quote

Nice work Tom! See you in a few weeks.

Greg
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grueni
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PostPosted: Thu Oct 29, 2009 1:29 am    Post subject: Reply with quote

grueni wrote:
funny looks like the same i thought about when starting thinking about rocker ratio. but alot of work and i thougt about using stock rocker...weldet and then relocat the new holes.

am i right that this are the later intake rocker from 356/912 porsche?

beautifull work.


i also have a question to you tom PM

wishes from berlin


how I told once, now after get my cam grinded to my wishes I could start the rocker geometrie.
this is just the test-head its only about the rocker stands.
after machinig them they are now 1,33:1 in ratio everything was fine so I can start the next days with my big singleport's
sorry its in german
http://bug-talk.de/forum/viewtopic.php?t=24323&start=15
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henry roberts
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PostPosted: Thu Oct 29, 2009 3:25 am    Post subject: Reply with quote

beautiful work.
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splitpile
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PostPosted: Thu Oct 29, 2009 8:51 am    Post subject: Reply with quote

grueni wrote:
grueni wrote:
funny looks like the same i thought about when starting thinking about rocker ratio. but alot of work and i thougt about using stock rocker...weldet and then relocat the new holes.

am i right that this are the later intake rocker from 356/912 porsche?

beautifull work.


i also have a question to you tom PM

wishes from berlin


how I told once, now after get my cam grinded to my wishes I could start the rocker geometrie.
this is just the test-head its only about the rocker stands.
after machinig them they are now 1,33:1 in ratio everything was fine so I can start the next days with my big singleport's
sorry its in german
http://bug-talk.de/forum/viewtopic.php?t=24323&start=15


Do you have the demensions of how far you moved the arms back?
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Unkl Ian
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PostPosted: Thu Oct 29, 2009 9:16 am    Post subject: Reply with quote

grueni wrote:

how I told once, now after get my cam grinded to my wishes I could start the rocker geometrie.
this is just the test-head its only about the rocker stands.
after machinig them they are now 1,33:1 in ratio everything was fine so I can start the next days with my big singleport's
sorry its in german
http://bug-talk.de/forum/viewtopic.php?t=24323&start=15



NICE work.
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grueni
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PostPosted: Fri Oct 30, 2009 4:11 am    Post subject: Reply with quote

hi folks...
today I did all the messuring stuff on the rocker geometrie..this was just the test-head..
at first i call them "medusa-rocker ratio's" all the stuff I build by my own is now medusa stuff Wink, cam , supercharger system,engine Wink just vor fun.

the offset is exact 4,5mm.
because off all the messurmants I did..more than 10 times every messure to calculate out the mistakes.
the exact theoretical rocker ratio is 1,3214:1 so 1,32:1 the post befor I forgott that the rockers are a bit different just 0,5mm.
the shaft is exact in level to the valves.

rocker and valve match very good.
for the racers:
1,34:1 is possible with these rockers..but it is it's max.

with my cam it should be about 0.480" lift max. an the EX. and 0.470" on the IN.
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splitpile
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PostPosted: Fri Oct 30, 2009 10:48 pm    Post subject: Reply with quote

grueni wrote:
hi folks...
today I did all the messuring stuff on the rocker geometrie..this was just the test-head..
at first i call them "medusa-rocker ratio's" all the stuff I build by my own is now medusa stuff Wink, cam , supercharger system,engine Wink just vor fun.

the offset is exact 4,5mm.
because off all the messurmants I did..more than 10 times every messure to calculate out the mistakes.
the exact theoretical rocker ratio is 1,3214:1 so 1,32:1 the post befor I forgott that the rockers are a bit different just 0,5mm.
the shaft is exact in level to the valves.

rocker and valve match very good.
for the racers:
1,34:1 is possible with these rockers..but it is it's max.

with my cam it should be about 0.480" lift max. an the EX. and 0.470" on the IN.


Very nice work, thank you for the info
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oval56
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PostPosted: Mon Nov 23, 2009 2:55 pm    Post subject: Reply with quote

i have done my homework also....

www.oval56.de/video/okrasa%20rockers.wmv

next step cylinder piston and headwork
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