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i wonder what a nice prepared Grp44 race heads would do on a good condition 6.0L, pre HE engine?
warrjon a straight round port would be almost impossible with any V12 engine , 1st would need 12 individuel TB plates!
i suppose it could be done but cost would be staggering! then comes the tuning, probably cost as much as the engine itself! these self tuner ECUs only get you close.
HEY i like your new Lathe, and mill, next comes a good surfacing machine, so you could build a closed deck block?
then you need a main brg align bore machine, the list is endless!
pic of my Align bore , with a LAMBO V12 block on it.
Continuing on the theme of head design, I can't remember if I've seen a discussion about this design anywhere else: A V12 head w/ a non-wedge Chevy-like-chamber casting (flat head based I presume.)
Well my clever lad has been making visible progress, he has fixed the CAD programming so that he can quickly adjust inlet port size whilst maintaining port wall thickness. The saving on port machining and opening will be great with heads being made for a required port size. Looking to see if we can possibly fit in twin plugs given the poor combustion chamber, if indeed you can call the remaining area a chamber!
Pics top follow.
24 spark plugs would be interesting. Looking forward to the pix.
Originally Posted by xjr5006
Well my clever lad has been making visible progress, he has fixed the CAD programming so that he can quickly adjust inlet port size whilst maintaining port wall thickness. The saving on port machining and opening will be great with heads being made for a required port size. Looking to see if we can possibly fit in twin plugs given the poor combustion chamber, if indeed you can call the remaining area a chamber!
Pics top follow.
So who makes the Quad heads, on the Orange roadster and the Red E-Type shown in the U-Tube videos earlier in this thread?
If they exist already, why all the discussion/speculation about feasibility...are they available for purchase, or were those one off unobtainium for mere mortals?
Last edited by Fla Steve; Sep 7, 2018 at 10:05 PM.
So who makes the Quad heads, on the Orange roadster and the Red E-Type shown in the U-Tube videos earlier in this thread?
If they exist already, why all the discussion/speculation about feasibility...are they available for purchase, or were those one off unobtainium for mere mortals?
Those heads are AJ6 heads modified, and one reversed, then fitted to a V12 block. Valve gears and a great deal of other things have to be made as one-offs. An engine modified like that would come in a about 100,000 UK pounds, if you can find someone to do it. The bore spacing on the AJ6 and the V12 engines is identical - they were machined on the same machines on the same production line - which is why it is possible.
Thanks for the answer Greg. I figured they were beyond the range of affordability. This is an interesting discussion; however....It is disappointing to accept the fact that the "Mighty V12" Jaguar only puts out in the neighborhood of 300HP and Torque (for 326 Cu In); when as we all know, in 1957 Chevy had 1HP/CI in the Fuelie 283, and by 1962, the Fuelie 327 had 360HP. It's all in the cylinder head flow, along with the tune. So XJR5006; what is the objective you are trying to obtain with this new cylinder head? BTW; my Sea Ray had a 260HP 350CI stock engine.
NOTE: I purchased a Marinized 383 from Blue Print Engines; it was dynoed at 450 HP, 440 TQ. My boat went from a GPS verified 40 mph to 55 MPH!. That's huge for a heavy 24 ft boat.....I'm Very Happy. (I changed the weak Alpha outdrive to a Bravo; went from a 14 1/2" 17 pitch prop, to a 15" 19 pitch prop and it may even need a 21 pitch as I'm turning 5200 rpm.)
Last edited by Fla Steve; Sep 8, 2018 at 12:11 PM.
I mean, you're at it so why not? 
