Double OHC quad valve L series head

AliK

Vehicle Dating Officer
Staff member
Club Member
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/

059303e22400c6cd6fa069a2dce689dc.jpg
 

richiep

Club Member
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.
 
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?
 

AliK

Vehicle Dating Officer
Staff member
Club Member
Wow!!! I must have that sound in my life!!!

My left kidney is on notice.
 

AliK

Vehicle Dating Officer
Staff member
Club Member
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.
 
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Moriarty

Well-Known Forum User
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.
 
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.
 

Moriarty

Well-Known Forum User
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.
 

zNathan

Well-Known Forum User
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!
 
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