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Derek

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Derek last won the day on July 21

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About Derek

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    That Horny Z Guy
  • Birthday 04/01/1958

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    Central Florida USA

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  1. I’m sure OSHA would have no complaints with anything in this picture:) Now that I have a surfacer I’ve decided to play around with CC’ing chambers after I make my final pass. When I originally modeled the chamber in 3D I left a 1mm straight wall plus machine allowance for the builder. The reason for that was to create a known steady surface area if you wanted to really dial in the chamber volume. A .010” surface cut will remove approximately 1.3 CC’s. The problem is Even though there are seats in the head you can’t put valves in since the guides are not sized and even if you coul
  2. You beat me to it It was a lot better than I was expecting and mostly accurate. I'm glad they kept the HybridZ origins in there and a link to the page also.
  3. Ok well we know it will go to 3.4. Still a lot of questions though. Also the lack of actual pictures of the MRZ 3.4 DOHC makes me wonder. I will say that knowing MRZ's price points even if they offered a head like mine it would be pricey.
  4. Nope. I saw that awhile ago and assumed that they were either developing their own head or had made a deal with OSG to buy complete motors. It also say's Nissan 3400 straight 6. Neither the OSG nor mine is a Nissan product so I'm not sure what is going on. I suppose they could be doing some sort of RB thing. Can you get an RB out to 3.4? I don't think the head will flow enough to feed it though in a NA application.
  5. I am but as soon as I put bungs there I guarantee you someone will want them somewhere else. Also the majority of the builds are running Jenvey stuff and for the most part they come with bungs. And last but not least the casting works for both tilts depending on how I machine it. The bungs would over complicate that.
  6. I think Derek's injectors are at the head I purposely have left that stuff up to others since A: I know very little about making power and B I know even less than that I do know how to make a casting though so that's more important in my mind. I did a search on production vehicles that make over 100 HP per liter NA and it's a pretty impressive list. Rob sent me a link to an article that came out. https://www.thedrive.com/news/41805/nissan-240z-roars-with-honda-style-dohc-head Links to and mentions this build thread which was nice.
  7. Thanks Ben I'm glad some numbers on a 3.2L (3.18) are finally out. 100hp per liter is pretty decent from what I hear. Rob feels like there is still some more to be had via tuning but it's a street car so there is always a balance to strike. I'm just glad that for Zcar Garage it's now an itch they need to scratch.
  8. I own one and the videos even got my blood pumping. That car is really amazing. Hopefully after this round of heads I'll be able to finally finish my 3.1 ish build. I will say that the sound is pretty much the same with mine. It's really great that now there are some real HP numbers on the head. It's an expensive head for sure but getting 350HP at the wheel out of a regular ported head wouldn't be cheap. The best part is that is the SEMA car that HAD the OSG head. Had..... Bwahaha
  9. Looks great. I think you drove mine at Bill's if I remember correctly. That was with Rfactor. It's up in a pallet rack since I seem to have ZERO free time these days. How do you like the VR vs monitor?
  10. Just had a long talk with Rob. He has some valid points but mostly they are just so busy that it kind of has been pushed aside from a social media standpoint. He was hesitant to post numbers because he knows he can get more out of it with a better tune. The owner of the car loves the head and has zero complaints about it. The problem is Rebello is just so busy all the time that they take forever on a regular build. Add the complexity of the KN20 and waiting a year for a motor is a real buzz kill. Other avenues are being explored to speed it up and at the request of Rebello I'm now
  11. As it stands I have been paid for 10 cylinder heads. The only ones that are actually running and drivable is SN001 which is mine and I have over 7K miles on it, SN005 has over 10 K I think and SN010 which is in a Zcar Garage/Rebello build. Probably not to many miles on it but the word I got on that one was the owner was very happy. That car is a 3.15L I think. They haven't released the Dyno numbers at this point for whatever reason but I was told it was very impressive. Here is a link to an instagram video they posted of it on the dyno and then a short blast on the street. https://www.ins
  12. It's not a good platform. And it won't matter how many caveats I put out there on how tired the motor is or the lack of compression ratio etc etc the internet truth will be "that Datsunworks head only made XX hp". My butt dyno says it is faster than a SOHC but not by much since the CR is way way low. Probably in the 9:1 range. If I needed the data I would do it in a heart beat but I don't.
  13. Well If I ever get my 3.15L built I'll have some numbers but the the motor that is currently in it there is no reason to dyno it.
  14. When I did the KN20 prototype I used a lot of JB weld on the water outlet without issue. I would have done it after assembly though to give it a little more to hang onto.
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