The liners would appear thinner on a standard engine. I would have thought it would be pretty obvious.
dougdotcom
Active Member
so is the block ground to take the top hat?
Irishrover
Well-Known Member
The top face of the block is bored out to create a "Step" for the flange on the top hat liner to sit in.
Yes it is cut out with a boring bar to accept the new top hat flange.The liner is then trapped between head and block and cannot move. Think what a good engine it would have been if Land Rover had spent a little more in production.
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norseman
Well-Known Member
I agree entirely but then does the 'top hat' prevent the block cracking behind the liner? I'm given to understand that when the yanks designed the engine the liners were cast in the block (technical explanation appreciated) as opposed to Rover's method of pressing them in.
Yeah i have a manual 928s with that engine. Silicone impregnated alloy bores.
You would think they would have modded it long ago. The casting has to be machined to take the straight liners adding a flange cutter to the boring bar would not have cost the earth. Likewise the liners. Even a 0.050" lip would have done the job.
norseman
Well-Known Member
Nickasil coating I believe. Porsche appears to have got it right but BMW tried the same trick with some models with both 6 & 8 cyl engines & really caught a cold, something to do with a high sulphar content in the fuel. If an outfit like that can get it wrong can you imagine what a f... up LR would have made?
Derek Ward
Active Member
They did. Jaguar used it on the first of their V8s. Not sure how they got around it though. Didn't they have to liner them after that or did they alter the Nikasil formula or something?
fett
Well-Known Member
correct , luckliy my one had had a warenty alusil block fitted before I got it at a parts cost of £1700 in 1995!!
