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 dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on June 29th, 2012 at 08:01 AM |
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| Quote: | Originally
posted by Stanley
What's doing DB......been quiet at Reedy Creek
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Been very busy with work since racing in Sydney,
but found some time at nights, to work on some improvements.
With some discussions with Roger Crawford at Heads Up performance,
and his valve train analysis program,
the momentum of the pushrods was out stripping the valve spring tension by 7200 to 7400rpm. (800lbs).
So I have reduced the mass slightly, without sacrificing the desired stiffness,
and am looking at making an improved rocker arm to reduce the flex.
I tried a lighter pushrod, made from 3/4" 7075 aluminium, but lift loss was a further .010".
While the rocker arms were not at fault for the failures,
(Mr Crawford uses these up to 11000 rpm and nearly 1" of lift,),
there is some flex within the arm as seen from the loss of lift from light "checking springs" to the actual race springs.
I have made one of each as prototypes,
and will do a production run of one set, once the clearances are worked out on the engine.
Here is an original arm, set on the jig as a guide, to curve the tops of the new ones.
| Quote: | Originally
posted by westi
That's mad Alan.
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on June 29th, 2012 at 08:04 AM |
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Here you can see the comparison of the originals, and the new versions.
| Quote: | Originally
posted by westi
That's mad Alan.
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66deluxe
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| posted on June 29th, 2012 at 08:09 AM |
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Holy shit, good work Dave.
This is my Volkswagen, there are many like it, but this one is mine. Without me my Volkswagen is useless, without my Volkswagen, I am useless.
61 Karmann Ghia 2110cc type1 w Los Panchito's
66 Deluxe Beetle 2270 type 4
10 Subaru WRX Impreza
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vassy66T1
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| posted on June 29th, 2012 at 10:11 AM |
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Very clever Dave 
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ian.mezz
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| posted on June 29th, 2012 at 10:19 AM |
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you should give Ron Flemming a call , I was telling him about your big arse push rods 
He told us heaps of stuff about push rods , valve , and rocker when we was at fAT Performance .
his on face book to.
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1916baja
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| posted on June 29th, 2012 at 12:09 PM |
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Wow Dave! Is there anything you can't make?
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20bkombi
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| posted on June 29th, 2012 at 12:53 PM |
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| Quote: | Originally
posted by 1916baja
Wow Dave! Is there anything you can't make?
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I think Dave has it all covered if its engineering, baking in the oven or a good impression on a mature lass
Nice work man!!!
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Stanley
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| posted on June 29th, 2012 at 02:51 PM |
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| Quote: | Originally
posted by 20bkombi
| Quote: | Originally
posted by 1916baja
Wow Dave! Is there anything you can't make?
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I think Dave has it all covered if its engineering, baking in the oven or a good impression on a mature lass:
Nice work man!!!
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I'm sure last time I was down there, there was a working model of a scaled down nuclear reactor
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1916baja
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| posted on June 29th, 2012 at 03:31 PM |
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I think Daves next challenge should be machining parts for an entire engine! although i dont know if that would really be much of a challenge for him.
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westi
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what the
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| posted on July 4th, 2012 at 01:19 AM |
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u crack me up dave.
amazing as always.
down sharon.
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on July 4th, 2012 at 05:11 AM |
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| Quote: | Originally
posted by westi
That's mad Alan.
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mactaylor
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| posted on July 4th, 2012 at 07:58 AM |
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did I read that dial indicator correct?
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on July 4th, 2012 at 08:16 AM |
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yep, all valves have .800lift plus or minus a couple of thou. 
| Quote: | Originally
posted by westi
That's mad Alan.
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 matberry
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| posted on July 4th, 2012 at 08:58 AM |
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wow....nice one Dave 
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
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whathaveidone
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| posted on July 4th, 2012 at 11:31 AM |
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I'd love to see what you could come up with if you had alot of time of your hands!!
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mactaylor
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| posted on July 5th, 2012 at 07:39 AM |
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very cool dave!
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HappyDaze
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| posted on July 5th, 2012 at 08:35 AM |
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To be able to make a rocker like that is mind-boggling.........but to then make another 7 identical!
I'd rather wear a Beetle out by racing it than by polishing it!
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on July 10th, 2012 at 07:29 AM |
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| Quote: | Originally
posted by HappyDaze
To be able to make a rocker like that is mind-boggling.........but to then make another 7 identical!
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That challenge remains, those ones are the prototypes.
I checked every cylinder to see the gains in lift...about .030" through reduced flex.
Now the chore begins:
| Quote: | Originally
posted by westi
That's mad Alan.
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dangerous
A.k.a.: Dave Butler Muffin Man
23 Windows of Awesome
Posts: 5901
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Registered: January 6th, 2005
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Location: Gold Coast
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| posted on July 10th, 2012 at 07:53 AM |
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| Quote: | Originally
posted by ian.mezz
you should give Ron Flemming a call , I was telling him about your big arse push rods
He told us heaps of stuff about push rods , valve , and rocker when we was at fAT Performance .
his on face book to.
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Yes, Ron rings me for advice all the time.
| Quote: | Originally
posted by westi
That's mad Alan.
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vassy66T1
A.k.a.: Marcus Vass
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| posted on July 10th, 2012 at 09:32 AM |
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Make sure you sweep up all that swarf 
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dragvw2180
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| posted on July 10th, 2012 at 10:22 AM |
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Wow .030 gained just turning it over by hand, just imagine how much you were losing at 8000 rpm's !!!!!! Mike McCarthy
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20bkombi
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| posted on July 10th, 2012 at 01:05 PM |
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Awesome Dave!!
Love your work!
How did you hold and clamp them for the fist cut, a vice??
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Specialising in Vw automatic transmissions, differentials and torque converters
Stock or modified to suit your application (street, drag, off road)
Ph 0402 233 027
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Stanley
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| posted on July 10th, 2012 at 07:28 PM |
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| Quote: | Originally
posted by dangerous
| Quote: | Originally
posted by ian.mezz
you should give Ron Flemming a call , I was telling him about your big arse push rods
He told us heaps of stuff about push rods , valve , and rocker when we was at fAT Performance .
his on face book to.
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Yes, Ron rings me for advice all the time.
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Nice.
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ian.mezz
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| posted on July 10th, 2012 at 07:33 PM |
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| Quote: | Originally
posted by Stanley
| Quote: | Originally
posted by dangerous
| Quote: | Originally
posted by ian.mezz
you should give Ron Flemming a call , I was telling him about your big arse push rods
He told us heaps of stuff about push rods , valve , and rocker when we was at fAT Performance .
his on face book to.
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Yes, Ron rings me for advice all the time.
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Nice.
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thats good to hear yous blokes keep in touch
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Super1302
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| posted on July 11th, 2012 at 05:18 PM |
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nice work, i like my shed, but wish it was filled with all the tools you have.
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on July 13th, 2012 at 04:09 PM |
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| Quote: | Originally
posted by 20bkombi
How did you hold and clamp them for the first cut, a vice??
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Initially I do as many facets as I can
using the vice and parallel strips underneath.
But eventually I had to make a jig and spacers to bolt each rocker down for the final shaping of the sides.
| Quote: | Originally
posted by westi
That's mad Alan.
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RISKY4LIFE
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| posted on July 13th, 2012 at 05:54 PM |
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| Quote: | Originally
posted by Super1302
nice work, i like my shed, but wish it was filled with all the tools you have.
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i don't think i would know how to turn on most of Dave's
gear !!
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mactaylor
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| posted on July 14th, 2012 at 03:22 PM |
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| Quote: | Originally
posted by RISKY4LIFE
| Quote: | Originally
posted by Super1302
nice work, i like my shed, but wish it was filled with all the tools you have.
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i don't think i would know how to turn on most of Dave's
gear !!
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I bet rub it gently and wisper sweet volks porn in his ear!
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1916baja
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| posted on July 14th, 2012 at 09:43 PM |
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on July 18th, 2012 at 07:50 AM |
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| Quote: | Originally
posted by westi
That's mad Alan.
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