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TXHCBeetle
Samba Member
Joined: October 07, 2021
Posts: 177
Location: Boerne, TX
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 Posted: Tue Mar 19, 2024 7:11 am Post subject: Re: Lightening any and everything … |
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| Vanapplebomb wrote: |
Bruce, that is only true for direct loading in tension. What you are talking about is how much force it takes to yield two different areas for a given material strength, which is a linear relationship to yield strength and cross section area. Indirectly, this can also be applied to deflection (stiffness), but it isn’t linear. So, yes, obviously hollowing out journals reduces the load that can be applied in tension and bending for a given deflection.
HOWEVER…
It’s not that simple. A crankshaft does not see a maintained static force applied in one direction. It is cyclical, and that changed EVERYTHING. Same is true for bolts. Your baseline yield or tensile strength is rendered somewhat irrelevant because the strength properties change in relation to operating conditions. Survival of the part becomes less dependent (to a degree) on force over a given cross section area (like you talk about), and more about shear stresses at the surface grain boundaries. There are a whole host of things that play into surface conditions… localized compressive forces (shot peening), part geometry, stress concentrations, etc. Remember, due to fatigue, you can fracture a part with FAR less force than the theoretical force based on the tensile strength of the material and cross section area. To some degree, you can manipulate those variables to change how strong you part is at a given number of cycles. See the picture I posted above. Cyclical loading is a whole different ball game.  |
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Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5571
Location: Holland, MI
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| Posted: Tue Mar 19, 2024 8:21 am Post subject: Re: Lightening any and everything … |
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These are the lifters I was wondering about on the last page. If anyone knows any current manufacturers, I would be interested.
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1800 Type 4 Berrien 295
http://www.thesamba.com/vw/forum/viewtopic.php?t=487021 |
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BFB
Samba Member
Joined: November 03, 2014
Posts: 2532
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| Posted: Sat Mar 30, 2024 8:00 pm Post subject: Re: Lightening any and everything … |
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"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't. |
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Bruce
Samba Member
Joined: May 16, 2003
Posts: 17553
Location: Left coast, Canada
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| Posted: Sun Mar 31, 2024 3:06 am Post subject: Re: Lightening any and everything … |
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Is that a stock steel retainer?
Weights?
I bet it still weighs more than a Ti retainer.
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| overheard at the portland Swap Meet... wrote: |
| ..... a steering wheel made from a mastadon tusk..... |
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celtune
Samba Member
Joined: January 31, 2010
Posts: 29
Location: Austria
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| Posted: Sun Mar 31, 2024 3:16 am Post subject: Re: Lightening any and everything … |
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| Bruce wrote: |
Is that a stock steel retainer?
Weights?
I bet it still weighs more than a Ti retainer. |
Hi Bruce,
i could not find an exact weight but here is the discription from the csp page:
"These special valve spring retainers are made of Saar steel - 42CrMo4 CNC and have a strength of 900 - 1200 N/mm² with a weight saving of approx. 5 grams per piece compared to the standard Type-4 valve spring retainer. The two-stage valve spring seat allows the use of an outer Type-4 valve spring, which can be combined with an inner waterboxer valve spring if required."
https://www.csp-shop.com/en/?func=detailcall&artnr=32515a
You need to switch to the german page for the pics |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27588
Location: Colorado Springs
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| Posted: Sun Mar 31, 2024 11:22 am Post subject: Re: Lightening any and everything … |
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Neat solution for that particular problem but not the most ideal design.
I like tool steel retainers, they can be made very thin.
The retainer can be springy, it can be an extension of the spring, and springs don't need holes. |
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panel
Samba Member
Joined: December 02, 2001
Posts: 1184
Location: Victoria B.C. Canada
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Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5571
Location: Holland, MI
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gears
Samba Member
Joined: October 28, 2002
Posts: 4411
Location: Tamarack, Bend, Kailua
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| Posted: Mon Apr 29, 2024 11:40 am Post subject: Re: Lightening any and everything … |
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Quite a few years ago, I walked into Dave Folts' shop, and he was carving a few ounces from the backside of a customer's ring gear, end-milling neat little pockets between the bolt holes. Needless to say, Dave appreciates the 7 POUNDS we removed from the GT version 091 TBD .. https://www.thesamba.com/vw/gallery/pix/2270675.jpg
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QRP
Samba Member
Joined: April 27, 2008
Posts: 1886
Location: NORTH HOLLYWOOD,CA
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| Posted: Mon Apr 29, 2024 2:05 pm Post subject: Re: Lightening any and everything … |
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| Bruce wrote: |
Is that a stock steel retainer?
Weights?
I bet it still weighs more than a Ti retainer. |
Stock retainers are about 17g, I trimmed some down to 14g |
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Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5571
Location: Holland, MI
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| Posted: Mon Apr 29, 2024 2:15 pm Post subject: Re: Lightening any and everything … |
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Trimming a stock retainer down to 14 is pretty good, actually. Took off more than I thought you could.
These are stock steel retainers for a popular V8 engine (you can probably guess which one), but nobody said you can’t use other engine parts on a VW.
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1800 Type 4 Berrien 295
http://www.thesamba.com/vw/forum/viewtopic.php?t=487021 |
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Stripped66
Samba Member
Joined: May 31, 2005
Posts: 3507
Location: Charleston, SC
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| Posted: Thu May 02, 2024 9:15 am Post subject: Re: Lightening any and everything … |
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| Vanapplebomb wrote: |
These are the lifters I was wondering about on the last page. If anyone knows any current manufacturers, I would be interested.
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When Schubeck closed, a former employee picked up manufacture of the lifters (Smith Machine/SM Lifters), at least for V8 applications. Apparently, they are closed, too.
I don't believe there are any current manufacturers.
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| 66brm wrote: |
| Bodacious wrote: |
| Why not just make a custom set of wires with a Y splice in them. Then you could just run one distributor. |
I don't think electrickery works that way |
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panel
Samba Member
Joined: December 02, 2001
Posts: 1184
Location: Victoria B.C. Canada
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BFB
Samba Member
Joined: November 03, 2014
Posts: 2532
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| Posted: Sat Jan 18, 2025 12:56 pm Post subject: Re: Lightening any and everything … |
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I had a Mazzone sandrail that had drums on it like that
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"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't. |
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BFB
Samba Member
Joined: November 03, 2014
Posts: 2532
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| Posted: Sat May 17, 2025 7:17 am Post subject: Re: Lightening any and everything … |
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_________________
"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't. |
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liquidrush
Samba Member
Joined: July 18, 2018
Posts: 739
Location: MO
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| Posted: Sat May 17, 2025 4:39 pm Post subject: Re: Lightening any and everything … |
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| That is completely wild! How much weight do you reckon you removed? Looks like about 30% and looks totally cool too. Like having a life size cut away learning tool. |
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BFB
Samba Member
Joined: November 03, 2014
Posts: 2532
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| Posted: Sat May 17, 2025 5:40 pm Post subject: Re: Lightening any and everything … |
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Sorry, not mine, it was in the Samba photos.
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"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't. |
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jim martin
Samba Member
Joined: January 14, 2004
Posts: 320
Location: Vancouver, BC
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| Posted: Sun May 18, 2025 2:53 pm Post subject: Re: Lightening any and everything … |
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I’m kinda opposite with crank and flywheel .
I remember when I switched to a Demello full circle crank and a nearly full weight flywheel I ended up turning faster 60 and 330 ft times which led to faster 1/4 times .
There was just more rotational mass the car would not bog and put more power going fwd , motor just maintained rpm instead of trying to recover it.
Even now I follow same program with crank and flywheel . On the street or launching at the strip just works
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