|Job # 2189 (MW) - Stage Two 7 liter Jaguar
Stoker engine rebuild incorporating very special Group 44 cylinder heads
Update report - January 14, 2017
Block machine work, continued...
|Indicating additional relief that will be
for full honing stroke
|Block now machined for over-sized custom
Boring the block to accept the custom over-sized liners.
|Custom oversized liners
||Boring the block for the new liners
|To be continued..
|Factory bores were .002" out of round
Comparing the Group 44 heads to more traditional Jaguar castings has thrown up some remarkable flow test results. At about .450" lift, a standard V12 Jaguar intake port flows around 159 cfm. After our Stage One/Two porting and valve job, the standard V12 Jaguar intake port will pick up around 37 cfm, ultimately flowing about 197 cfm.
The Group 44 heads, with their completely different casting and runner design, plus of course larger valves, flowed an impressive 235 cfm right out of the box. Following our valve job, and blending the seats to the venturis, we picked up an additional 15 cfm, for a maximum flow number of almost 250 cfm - more than 90 cfm more than an unported V12 Jaguar intake typically flows.
These numbers are pretty spectacular!
|Note difference between Group 44 ports
the regular Jaguar fayre (above)
|Surfacing the heads
|Blending valve job with venturis
|Designing custom stroker piston by creating
a plastic model
|This is a sample of typical Stage One/Two
numbers (before and after porting)
|Out of the box, the Group 44 heads flowed
more than even our ported standard Jaguar casting
|After CJ valve job and venturi blend, the
heads flowed 106 cfm (@.500 lift) more than a
standard (unported) Jaguar casting!
I am pleased to report that we now have this very special engine rebuild well underway.
|Pulling seized cylinder heads using our
|Group 44 heads will be used in this build.
on this later...
|Pressure testing the Group 44 heads
|Preparing to bore out the block for the
over sized liners
|Align hone in progress
|Stroked forged crankshaft
|Lightweight billet steel flywheel and
RBR rear seal upgrade
Go to other CJ engine rebuilds