No username? Register here.
  #1  
Old 14-07-2017, 01:24 PM
smileyinside's Avatar
smileyinside smileyinside is offline
Administrator
Fifth gear
 
Join Date: Jun 2013
Location: The dog house
Posts: 2,276
Member 911
Double OHC quad valve L series head

I can't remember if I shared or indeed anyone else shared this but I thought it may be of interest.

Something exciting for those of us without OS Giken money to aspire to.

Tim - don't worry, this link is "Mrs safe"! :P

http://www.datsunworks.com/Blog/

Reply With Quote
  #2  
Old 14-07-2017, 04:35 PM
richiep's Avatar
richiep richiep is offline
Z Club member
Fifth gear
 
Join Date: Jul 2003
Location: Macclesfield, Cheshire
Posts: 2,408
Member 167
It was discussed on the OS Giken thread a while back. A few of us are watching with interest the excellent thread about it over on hybridz.org. A twin cam head kit that would actually be semi-affordable versus the unobtainium of the TC24-B1Z.
Reply With Quote
  #3  
Old 14-07-2017, 04:56 PM
franky franky is offline
Z Club member
Sixth gear
 
Join Date: Sep 2011
Location: Sunny southwest
Posts: 3,128
Member 770
Quote:
Originally Posted by richiep View Post
It was discussed on the OS Giken thread a while back. A few of us are watching with interest the excellent thread about it over on hybridz.org. A twin cam head kit that would actually be semi-affordable versus the unobtainium of the TC24-B1Z.
has he had it on the dyno etc yet vs his standard head?
Reply With Quote
  #4  
Old 14-07-2017, 06:01 PM
Turn & Burn Turn & Burn is offline
Z Club member
Second gear
 
Join Date: Apr 2016
Location: Cumbria
Posts: 104
Member 1085
It's up and running, sounds amazing on this clip...

https://youtu.be/gYxPvMvYvrU
Reply With Quote
  #5  
Old 14-07-2017, 06:39 PM
smileyinside's Avatar
smileyinside smileyinside is offline
Administrator
Fifth gear
 
Join Date: Jun 2013
Location: The dog house
Posts: 2,276
Member 911
Wow!!! I must have that sound in my life!!!

My left kidney is on notice.
Reply With Quote
  #6  
Old 14-07-2017, 06:51 PM
smileyinside's Avatar
smileyinside smileyinside is offline
Administrator
Fifth gear
 
Join Date: Jun 2013
Location: The dog house
Posts: 2,276
Member 911
Quote:
Originally Posted by richiep View Post
It was discussed on the OS Giken thread a while back. A few of us are watching with interest the excellent thread about it over on hybridz.org. A twin cam head kit that would actually be semi-affordable versus the unobtainium of the TC24-B1Z.


This one, right?

http://forums.hybridz.org/topic/1196...t-datsunworks/
Reply With Quote
  #7  
Old 14-07-2017, 07:00 PM
franky franky is offline
Z Club member
Sixth gear
 
Join Date: Sep 2011
Location: Sunny southwest
Posts: 3,128
Member 770
It'd be interesting to see how it compares to a properly done head like SKiddell has on his(cnc done head).
Reply With Quote
  #8  
Old 14-07-2017, 07:19 PM
jonbills's Avatar
jonbills jonbills is offline
Z Club member
Fifth gear
 
Join Date: Sep 2005
Location: M6
Posts: 2,300
Member 254
No one but skidell dare answer 🙄
__________________
1974 260z
Reply With Quote
  #9  
Old 14-07-2017, 10:51 PM
smileyinside's Avatar
smileyinside smileyinside is offline
Administrator
Fifth gear
 
Join Date: Jun 2013
Location: The dog house
Posts: 2,276
Member 911
Double OHC quad valve L series head

OK I'll dare but cautiously - I'd hazard a guess that in some ways one beats the other and vice versa! The twin cam sounds like it "comes on" noticeable at a particular point. Listening to the video, it was reminiscent of my old S2K once the vtec cut in.

I bet a "properly done" n47 or P90 head has a smoother more linear torque curve.

Last edited by smileyinside; 14-07-2017 at 11:12 PM..
Reply With Quote
  #10  
Old 16-07-2017, 07:39 PM
Moriarty Moriarty is offline
Website member
Second gear
 
Join Date: May 2012
Location: A Waterfall
Posts: 93
There is very little comparison
The Datsun works head is a very cleverly (and skillfully) crafted Honda K series scale up, and Honda heads are renown for making very high BMEP figures due to excellent port and chamber design

The P90 (in practical applications) can flow enough air to make figures over and above 300HP (350 with bigger valves, offset guides huge ports, big compression, over 3 litres and a well matched cam) where as the Datsun works head will EASILY flow figures that would dwarf that plus it has a very stable twin cam/lifter layout that will rev comfortably to 9-10K (HP = torque and rpms right)

The downside is that its still a lot of money, 10K will buy you the head and induction system but its not going to bolt onto a cooking or even mildly built engine and make big numbers, the bottom end would need decent crank, rods, pistons etc to get the rpms and compression up plus it needs a custom exhaust manifold etc not for the faint hearted

Budget circa 15K (ex labour) when its imported a decent L series short engine is built and set up.
But in the right circumstances on say a 3.2 or a 3.3 litre 400 naturally aspired HP and a noise to wake the dead would be something to behold

Conversly a crate V8 LS3 and T56 could be had for circa 7k and would make enough torque to put that new iceberg back in place.
Reply With Quote
  #11  
Old 16-07-2017, 08:32 PM
franky franky is offline
Z Club member
Sixth gear
 
Join Date: Sep 2011
Location: Sunny southwest
Posts: 3,128
Member 770
Quote:
Originally Posted by Moriarty View Post
There is very little comparison
The Datsun works head is a very cleverly (and skillfully) crafted Honda K series scale up, and Honda heads are renown for making very high BMEP figures due to excellent port and chamber design

The P90 (in practical applications) can flow enough air to make figures over and above 300HP (350 with bigger valves, offset guides huge ports, big compression, over 3 litres and a well matched cam) where as the Datsun works head will EASILY flow figures that would dwarf that plus it has a very stable twin cam/lifter layout that will rev comfortably to 9-10K (HP = torque and rpms right)

The downside is that its still a lot of money, 10K will buy you the head and induction system but its not going to bolt onto a cooking or even mildly built engine and make big numbers, the bottom end would need decent crank, rods, pistons etc to get the rpms and compression up plus it needs a custom exhaust manifold etc not for the faint hearted

Budget circa 15K (ex labour) when its imported a decent L series short engine is built and set up.
But in the right circumstances on say a 3.2 or a 3.3 litre 400 naturally aspired HP and a noise to wake the dead would be something to behold

Conversly a crate V8 LS3 and T56 could be had for circa 7k and would make enough torque to put that new iceberg back in place.
not an l6 though and wouldn't sound the same.
Reply With Quote
  #12  
Old 17-07-2017, 01:35 AM
Moriarty Moriarty is offline
Website member
Second gear
 
Join Date: May 2012
Location: A Waterfall
Posts: 93
Quote:
not an l6 though and wouldn't sound the same.
No, it was just for a HP/ comparison that's all

Latest on the Datsunworks head (well last that I read) was that the original prototype that in Derick's car had dropped a valve seat after 4500 miles or so, and they were investigating as to the cause.
Reply With Quote
  #13  
Old 21-07-2017, 11:27 AM
zNathan's Avatar
zNathan zNathan is offline
Z Club member
Fourth gear
 
Join Date: Dec 2012
Location: UK
Posts: 520
Member 973
I feel like as an update to the guys not following his thread for fairness to Derick - the valve seat issue points to an incorrect installation by the installer, not Derick's head design.

Been following the thread for a long time and is amazing the design work gone into it. Love how he decided to extend a Honda K20 head!
__________________
1973 240z
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 07:27 PM.

The Future Is Bright... The Future Is ZClub!

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright ZClub.net, All Rights Reserved.