| Author |
Message |
bvilletom
Samba Member
Joined: January 22, 2006
Posts: 95
Location: cedar rapids iowa usa
|
 Posted: Fri May 01, 2009 4:09 pm Post subject: 36 Rocker Art |
 |
|
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)
_________________
bvilletom
36hp Challenge record holder New Age 126.236mph
1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
1987 Chevy Turbo Sprint – under construction
Last edited by bvilletom on Tue Jul 07, 2009 4:19 pm; edited 1 time in total |
|
| Back to top |
|
 |
grueni
Samba Member
Joined: November 03, 2008
Posts: 582
Location: Germany
|
| Posted: Fri May 01, 2009 5:07 pm Post subject: |
|
|
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 |
|
| Back to top |
|
|
Julio Iniguez
Samba Member
Joined: April 19, 2004
Posts: 130
|
| Posted: Sat May 02, 2009 11:33 am Post subject: |
|
|
Very nice Tom!! Good luck on the test bed.
Julio |
|
| Back to top |
|
|
Art Thraen
Samba Member
Joined: January 19, 2004
Posts: 478
Location: Utah
|
| Posted: Sun May 03, 2009 8:15 am Post subject: |
|
|
Nice PICs Tom.... These little engines are Fun... But hard to hopUP..
See you soon, Art @ ACE |
|
| Back to top |
|
|
Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 76897
Location: Sneaking up behind you
|
| Posted: Sun May 03, 2009 8:24 am Post subject: |
|
|
It's great to see all this performance stuff for the 36hp... it's about time.
_________________
Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare |
|
| Back to top |
|
|
Louis
Samba Member
Joined: September 26, 2007
Posts: 423
Location: canada BC
|
| Posted: Mon May 04, 2009 2:41 am Post subject: |
|
|
| good job... will be waiting for those thats for sure!! |
|
| Back to top |
|
|
Roadcow
Samba Member
Joined: November 14, 2003
Posts: 1012
Location: Stockton, Ca. area
|
| Posted: Tue May 05, 2009 8:14 pm Post subject: |
|
|
Nice work Tom.
_________________
71 Westy Roadcow
67 Panel
63 Bug
66 Ghia Bonneville 2014
74 Ghia Vert
69 Bonneville Ghia 150 in Chico
69 Bonneville Ghia in Ireland
80 Cabby 2.1 16v
98 Passat |
|
| Back to top |
|
|
blacklineracing
Samba Member
Joined: March 21, 2009
Posts: 128
Location: Salt Lake City, Utah
|
| Posted: Wed May 06, 2009 5:01 pm Post subject: |
|
|
Very nice Tom,
we can't wait to see how they work for you
Justin and Colton |
|
| Back to top |
|
|
Unkl Ian
Samba Member
Joined: September 11, 2008
Posts: 288
Location: Near Toronto
|
| Posted: Sun May 24, 2009 10:26 am Post subject: Re: 36 Rocker Art |
|
|
| bvilletom wrote: |
We’re going to be testing these under racing conditions May 16th.
|
How well did they work ? |
|
| Back to top |
|
|
Roadcow
Samba Member
Joined: November 14, 2003
Posts: 1012
Location: Stockton, Ca. area
|
| Posted: Sun May 24, 2009 1:07 pm Post subject: Re: 36 Rocker Art |
|
|
| 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.
_________________
71 Westy Roadcow
67 Panel
63 Bug
66 Ghia Bonneville 2014
74 Ghia Vert
69 Bonneville Ghia 150 in Chico
69 Bonneville Ghia in Ireland
80 Cabby 2.1 16v
98 Passat |
|
| Back to top |
|
|
Unkl Ian
Samba Member
Joined: September 11, 2008
Posts: 288
Location: Near Toronto
|
| Posted: Sun May 24, 2009 3:32 pm Post subject: Re: 36 Rocker Art |
|
|
| Roadcow wrote: |
They set a new SSS record of 90 mph. |
Congratulations ! 
What were the arms for originally ? |
|
| Back to top |
|
|
bvilletom
Samba Member
Joined: January 22, 2006
Posts: 95
Location: cedar rapids iowa usa
|
| Posted: Tue Jul 07, 2009 4:13 pm Post subject: |
|
|
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
_________________
bvilletom
36hp Challenge record holder New Age 126.236mph
1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
1987 Chevy Turbo Sprint – under construction |
|
| Back to top |
|
|
greggearhead
Samba Member
Joined: June 20, 2004
Posts: 563
Location: Colorado Springs, CO
|
|
| Back to top |
|
|
grueni
Samba Member
Joined: November 03, 2008
Posts: 582
Location: Germany
|
| Posted: Thu Oct 29, 2009 1:29 am Post subject: |
|
|
| 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 |
|
| Back to top |
|
|
henry roberts
Samba Member
Joined: February 24, 2003
Posts: 1275
Location: australia
|
| Posted: Thu Oct 29, 2009 3:25 am Post subject: |
|
|
| beautiful work. |
|
| Back to top |
|
|
splitpile
Samba's Worst Speller
Joined: May 03, 2000
Posts: 5927
Location: back to living where hell meets the suface
|
| Posted: Thu Oct 29, 2009 8:51 am Post subject: |
|
|
| 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?
_________________
Stocking distributor of "The Funky Green Panels"
www.BUSTORATION.com metal and more for your bus
"no more hacking my sig line" |
|
| Back to top |
|
|
Unkl Ian
Samba Member
Joined: September 11, 2008
Posts: 288
Location: Near Toronto
|
| Posted: Thu Oct 29, 2009 9:16 am Post subject: |
|
|
| 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. |
|
| Back to top |
|
|
grueni
Samba Member
Joined: November 03, 2008
Posts: 582
Location: Germany
|
| Posted: Fri Oct 30, 2009 4:11 am Post subject: |
|
|
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  , cam , supercharger system,engine 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. |
|
| Back to top |
|
|
splitpile
Samba's Worst Speller
Joined: May 03, 2000
Posts: 5927
Location: back to living where hell meets the suface
|
| Posted: Fri Oct 30, 2009 10:48 pm Post subject: |
|
|
| 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 , cam , supercharger system,engine 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
_________________
Stocking distributor of "The Funky Green Panels"
www.BUSTORATION.com metal and more for your bus
"no more hacking my sig line" |
|
| Back to top |
|
|
oval56
Samba Member
Joined: July 21, 2003
Posts: 1309
Location: oktoberfest maintown
|
| Posted: Mon Nov 23, 2009 2:55 pm Post subject: |
|
|
i have done my homework also....
www.oval56.de/video/okrasa%20rockers.wmv
next step cylinder piston and headwork
_________________
www.oval56.com
1956 Oval, 2364ccm typ4
1957 Oval Ragtop 1584ccm singel port modified
1950 Hebmüller, 1584ccm okrasa modified
DBK Germany!!!!!!!!!!
www.dbkvw.com |
|
| Back to top |
|
|
|
