Hey guys, still sloooowly working on my supercharging my 6.0 V12. To lower compression, I milled out the combustion chambers down to the seat on the intake valve, using my copper gasket as the template. One of my club members suggested I have the heads ultrasonic tested to make sure my effort hasn't made the wall between the combustion chamber and water jacket too thin. There is a company in my town that will do this, but needs to know the grade of aluminum to get the correct reading. They stated that this was very important. Thanks!

 

Hiya, sorry I can’t help with the grade of ally. Can you tell me more about your planned supercharging? Thanks.

 

Page 63, April 1971 View Original Pages Materials used in the Jaguar V12 engine




Cylinder blocks: LM25 aluminium alloy, sand-cast open-deck.
Cylinder liners: 4 K6 cast-iron, machined all over, slip-fit.
Cylinder heads: LM 25P aluminium alloy, sand-cast.
Tappet blocks: C125 aluminium alloy, pressure die-cast.
Tappets: Chilled cast-iron.
Crankshaft: EN 16T manganese molybdenum Tuft rided forged steel.
Camshafts: Cast-iron.
Bearing caps: Chilled cast-iron.
Connecting-rods: EN 16T steel forgings
Main and Big-end Bearings: Vandervell steel-backed VP3 copper-lead.
small-end bushes: Clevite 10.
Sump: LM 24 aluminium alloy casting
Inlet manifolds: LM 6M aluminium alloy.
Jackshaft bearings: Steel-backed white metal.
Jackshaft: Cast-iron.
Valve guides: 2kII or NC cast-iron.
Valve inserts: Sintered iron.
Oil heat-exchanger: Cast aluminium.
Camshaft bearing caps: Die-cast aluminium alloy.
Pistons: LM 13WP aluminium alloy, pressure die-cast.
Inlet valves: EN 52 silicon chrome steel.
Exhaust valves: 21-4NS austenitic steel.
Head gasket: Cooper's steel-core, asbestos-filled.
Oil-filter head: Aluminium alloy.
Timing cover: Aluminium alloy.
Timing-chain tensioner blade: Polypenco Nylatron GS molybdenum disulphide-filled nylon.
https://www.motorsportmagazine.com/a...uar-v12-engine
Greg

 

I'll use this. Thanks! I can only hope that Ford didn't change the grade when they took over, or, if the grade changed when Jaguar went to the HE head.

 

I doubt it. The same foundry all through.

 

Yep same foundry, the WYF on the side of the block = West Yorkshire Foundry.
Doing some checking up on this and some castings ie block and heads were LM16, Blocks made of LM 25 actually have this cast on the side by the WYC.
TWR ensured their LM25 blocks were made of virgin LM25 as opposed to recycled bits (within the foundry) + virgin billets. There are no marks on heads to identify the metallurgy.
So I would get your guys to measure for both LM25 and LM16. I cant see that there will be much difference between the results for either, but I could be wrong.

see here also .http://www.cast-alloys.com/products/lm_chart.htm

 

This helps even more! I am scheduled to take them next Monday morning. I will tell them, and surely they will know, as this company specializes in aircraft.