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Derek

Twin cam head for the L6 from Derek at Datsunworks

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5 hours ago, turbogrill said:

For us that hasn't followed the 50 pages in this thread, is it possible to get a 3-4 sentence summary regarding progess, cost and expected use case?

Not sure this is a Champcar legal head, but I won't protest you if you run it.

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8 hours ago, zack_280 said:

Not sure this is a Champcar legal head, but I won't protest you if you run it.

 

The rules are clear, non-OE cylinder head is 100pts.

 

If Derek gives me one for free I would be happy to stress it for him. It would involve irresponsible drivers and ziptie loving mechanics...and somehow beer.

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On 3/27/2018 at 6:42 AM, Derek said:

Owner of V3 sent me an update picture.

 

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Pretty freaking cool if you ask me.

 

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I checked the 3D model and tilted the amount they did the intake side of the water jacket is just below the outlet so hopefully there won't be any steam pocket issues.

 

Snifff....I'm so proud:)

 

I wish I would have loved the ladder out of the background 

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VCT Progress!

 

So slowly but surely I have been chipping away at making the VCT fit in the available space. What a freaking PIA. The problem with timing chains is you are constrained distance wise by the pitch of the chain and the adjustment can be a bit coarse.  Multiply that by two and you can see how it can get tricky. I model things the best I can in 3D but when it comes to something like this I find a hands on approach leads to a more satisfactory result. 

 

Machined of the small gear from the KA24 idler.

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I'm using a 5C expanding mandrel that I machined to fit. 

 

Test fitting the Honda exhaust cam gear that I machined previously.

 

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Happy with the fit for sure.

 

 

Quick test fit with the first idler sub plate. Looks good but I know from experience that there is a really long road from this point to the final fitting.

 

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Here are the finalish mockup sub plates for the idler gear and the tensioner arm pivot. I may move the idler up another .010" but I haven't decided.

 

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I do the majority of my prototyping in plastic. Easier to work with than aluminum and a lot cheaper. The idler plate will be steel and the pivot plate will be aluminum.

 

Upper tensioner mount.

 

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The semi finished layout.

 

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Upper tensioner is from a Mazda 626. Hybridz member Tioga turned me on to this one . I reshaped the contact shoe a bit and slapped it on there. It is a ratcheting style. They can be problematic if the lobe design on the cams are crappy. The constant pumping on the chain can break the pawls. I'm making the assumption at this point the Schneiders lobe design is a lot better than Cranes and won't be a problem. I had to reshape the contact shoe and will probably work it some more if I stick with it.

 

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Tight fit but the bottom line is....It fits. Which is a good thing since I committed to the cams before I knew for sure.  Unfortunately I can't access the VCT oil ports on the head because the idler gear is covering them but I already designed a manifold as a work around.

 

So if the pictures make it look like this was a walk in the park here is a shot of the different versions of the sub plates I made to get the relationship between all those moving components the way I wanted them as well as fitting in the space I had to work with.

 

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I picked the wrong time to quit sniffing glue:)

 

 

 

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Derek,   I came to the L6 forum looking for tips on updating an L28 during rebuild and what did I find?  THIS!  This is amazing, I just read all 50 pages of this, and this has been a fantastic thread. I'll definitely keep watching. The 3D sand printing is intriguing, and seems to have great resolution.  You know I love 3D printing, and I understand what a big job this has been  The Fact that v1 lasted a good long time was great! I look forward to hearing how V2 and V3 (+VTC) will work out. you've got a lot of great partners that realize how amazing this is.  I won't be able to afford one of these for some time, if ever, but I would bet they'll hold their value well! Hopefully next time I'm in FL I can come by and see your shop!

 

Question though,  How did you figure the cam profile for 6 cylinders vs the Honda 4cy? Is it based on any existing L6 cam, or fully custom, derived from L28 cams?   I will keep watching this thread and lurk your Datsunworks site.  Amazing work! 

 

Phar

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Hi Phar

2 hours ago, Pharaohabq said:

and what did I find?  THIS! 

 

Took you long enough:)

2 hours ago, Pharaohabq said:

The 3D sand printing is intriguing, and seems to have great resolution

 

It truly is an amazing process. It opens up so many things to be produced that would not have been practical before.

2 hours ago, Pharaohabq said:

Question though,  How did you figure the cam profile for 6 cylinders vs the Honda 4cy? Is it based on any existing L6 cam, or fully custom, derived from L28 cams?

 

The profile that I machine into the cams are oversized based on a Schneider profile. At that point any cam grinder with a Honda profile can finish them off. The lobe is large enough for most builds. It's S7 which means it's through hardened so you are not restricted by case thickness. 

2 hours ago, Pharaohabq said:

I will keep watching this thread and lurk your Datsunworks site

 

Yea the VCT should be pretty interesting. I'm starting a pool for how many valves I bend before I get it all sorted:)  

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8 hours ago, texis30O said:

Is this a v2 or v3 head?  Robello not doing the build on the head?

 

This is a production head or V4. I now refer to the production heads by their serial number.   S/N005  is being assembled buy the person who bought it. He chose Xtreme  to do the head work and so far I think he chose wisely. They take raw Porsche head castings and bring them all the way to a finished product so I felt comfortable with them doing the work. They also have experience with the K20. I'm hoping they become an option for people who can't wait on Rebello or like S/N005 want's to do their own build. I'm assuming they will flow the head so they will have good data for people that want to go that route. 

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On 6/2/2018 at 5:46 AM, Derek said:

 

This is a production head or V4. I now refer to the production heads by their serial number.   S/N005  is being assembled buy the person who bought it. He chose Xtreme  to do the head work and so far I think he chose wisely. They take raw Porsche head castings and bring them all the way to a finished product so I felt comfortable with them doing the work. They also have experience with the K20. I'm hoping they become an option for people who can't wait on Rebello or like S/N005 want's to do their own build. I'm assuming they will flow the head so they will have good data for people that want to go that route. 

This is very interesting.....very....

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Yea hopefully it will open up some options for people. SN005 took a bullet for the team and payed for the fixtures and the programing. The tentative pricing I saw seemed pretty reasonable depending of course on the flow gains. I hand cleaned up the ports on my new head only removing the casting finish and then smoothing. I'm going to get if flowed so there will be some sort of base line.

 

 

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