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ivan
Joined: 12 May 2009
Posts: 14
Location: kalamazoo, michigan
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 Posted: Tue May 18, 2010 4:30 pm Post subject: |
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If I had seen these before I would have pumped out the N/A intake flange. Class is over so i no longer have access to the tools required.
Thanks for posting these up though man, it just made my day. |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Thu Feb 10, 2011 1:26 pm Post subject: |
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Made this one awhile back, just hadn't posted it.
Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Mike9311
Joined: 14 Dec 2004
Posts: 1798
Location: Chicago-ish
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| Posted: Fri Feb 11, 2011 2:49 am Post subject: |
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Hey Min
Been thinking about this for a while. Were you able to confirm HRc 60 ? I have also been wondering exactly what material would we choose (Edit: Oh I see the material now off to the left sorry, looked too fast). I am actually willing to try and make a set and run them.
Drawing looks good.
Edit: Do we know exactly what material is used in the camshafts and of course hardness. This would dictate the material and hardness choice of the tappet. The rest is imitation of the original modded as you show for valve stem caps for adjustment.
Mike
_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Sat Feb 12, 2011 12:33 am Post subject: |
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| Mike9311 wrote: | | Been thinking about this for a while. Were you able to confirm HRc 60 ? I have also been wondering exactly what material would we choose (Edit: Oh I see the material now off to the left sorry, looked too fast). I am actually willing to try and make a set and run them. |
Material and level of heat treatment were design decisions. Bigger issue is that the top surface should probably have a better surface finish than I've specified on those drawings, I had intended to polish(mirror) that surface after having them manufactured.
| Mike9311 wrote: | | Edit: Do we know exactly what material is used in the camshafts and of course hardness. This would dictate the material and hardness choice of the tappet. The rest is imitation of the original modded as you show for valve stem caps for adjustment. |
Camshafts are made of cast iron usually. Level of hardness is dictated by which component you wish to have wear first. Camshaft, or lifters.
I selected D2 becuase it is a inexpensive tool steel that should hold up in our conditions. If money was no issue I would have selected something with more molybdenum in it (better wear). The heat treatment was specified based on a few other design decisions such as the hardness of cast iron camshafts etc (and the camshaft design book I got my hands on). Also note that the stock lifters are chromized which can range in hardness, I'll have to look it up again (depending on weither it was soft or hard chromizing). I designed these lifters more than 6 months ago now. So I forget all the fine details.
I had intended to have these made, and then use them in my car before posting this drawing. Hasn't worked out that way.
Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Mike9311
Joined: 14 Dec 2004
Posts: 1798
Location: Chicago-ish
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| Posted: Sat Feb 12, 2011 3:11 am Post subject: |
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For me the biggest cost will be tooling possibly if I don't already have the stuff stocked (I use all Sandvik). I am also in the same boat as you that I research heavily and then ignore for months at a time but I have a tappet research file on my desktop. One book I am reading states an apparent rule of thumb for durability of the follower that it is 5HRc harder than the cam. PM me your email and I will email to you in PDF.
I was even think DLC coating and such. Of course that all depends how well things actually turn out and then I will decide on the investment.
_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Sun Feb 13, 2011 10:00 am Post subject: |
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| Mike9311 wrote: | | For me the biggest cost will be tooling possibly if I don't already have the stuff stocked (I use all Sandvik). I am also in the same boat as you that I research heavily and then ignore for months at a time but I have a tappet research file on my desktop. One book I am reading states an apparent rule of thumb for durability of the follower that it is 5HRc harder than the cam. PM me your email and I will email to you in PDF. |
The main reason for me has been that I have been flooded with schoolwork. These followers are the last thing I need to get sorted out before I can repair my car. I sent you an email.
| Mike9311 wrote: | | I was even think DLC coating and such. Of course that all depends how well things actually turn out and then I will decide on the investment. |
My main concern on coatings is the longevity. If the coating starts to fail locally due to the high level of stresses, it will spread quickly across the face of the lifter. Or pitting will occur.
Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Wed Jul 27, 2011 9:01 am Post subject: |
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Transmission plugs are actually tapered, not going to work.
Final O-ring Bore has been mirror polished.
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Wed Jul 27, 2011 9:02 am Post subject: |
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Digging the prismatic black powder coat.
Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Wed Jul 27, 2011 9:05 am Post subject: |
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Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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macBdog
Joined: 16 Aug 2004
Posts: 1111
Location: Brisbane, Australia
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| Posted: Wed Jul 27, 2011 9:32 am Post subject: |
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BRILLIANT WORK. Inspirational stuff, I aspire to this level of engineering when working on hobby cars..
_________________
1979 931 with a 350 chev
1973 911E with EFI
| p-talk wrote: | I'm still convinced the word 'Porsche' makes people crazy in all kinds of ways  |
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flosho
Joined: 01 Jul 2004
Posts: 3160
Location: Eau Claire, Wisconsin
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| Posted: Wed Jul 27, 2011 9:43 am Post subject: |
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Someone has been busy!
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[This Space For Rent] |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Wed Jul 27, 2011 10:11 am Post subject: |
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Fuel Rail isn't finished at all, I've got a 3D model of the new bracket system that I am currently fabricating, also working on building a valve stem grinding tool so I can get my valves into adjustment. I have over 700 megs in my 3d modelling folder since I've been out of school for the summer. Design and fabricated full exhaust systems including headers, etc. Fun stuff. This is just my porsche stuff.
Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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flosho
Joined: 01 Jul 2004
Posts: 3160
Location: Eau Claire, Wisconsin
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| Posted: Wed Jul 27, 2011 10:22 am Post subject: |
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| Min wrote: | Fuel Rail isn't finished at all, I've got a 3D model of the new bracket system that I am currently fabricating, also working on building a valve stem grinding tool so I can get my valves into adjustment. I have over 700 megs in my 3d modelling folder since I've been out of school for the summer. Design and fabricated full exhaust systems including headers, etc. Fun stuff. This is just my porsche stuff.
Min |
Sweet stuff! Are you done w/class completely or just summer break? I'm sure all this fun stuff makes it worth it! 
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[This Space For Rent] |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Wed Jul 27, 2011 11:04 am Post subject: |
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Just summer break, one more semester left before I'm free again.
Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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buldogo2
Joined: 13 Nov 2009
Posts: 79
Location: Nederland, Tilburg
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| Posted: Thu Jul 28, 2011 12:12 am Post subject: |
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| Min wrote: | Just summer break, one more semester left before I'm free again.
Min |
Good work looks very good what you made so far!
ps
I know the 3D cad drawing of the head from somewhere...hmm.  |
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