dougdotcom
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how to tell the difference
- Thread starter dougdotcom
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- Posts
- 58,170
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- Preston Lancs.
The liners would appear thinner on a standard engine. I would have thought it would be pretty obvious.
dougdotcom
Active Member
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so is the block ground to take the top hat?
Irishrover
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- La Trimouille, Vienne, France
The top face of the block is bored out to create a "Step" for the flange on the top hat liner to sit in.
gavbriggs
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- Sheffield uk
also notice the absence of a chamfer to the inside top of the liner!
top hatted blocks in theory (and if done correctly) cannot slip liners!!!
top hatted blocks in theory (and if done correctly) cannot slip liners!!!
- Posts
- 58,170
- Location
- Preston Lancs.
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.
Last edited:
norseman
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- Essex - UK
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.
Datatek
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Might have been even better if the Porsche system of running direct in a coated alloy block with no liners had been used.
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Yeah i have a manual 928s with that engine. Silicone impregnated alloy bores.
fett
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my bmw has that too, good system.
regarding the orginal american production method you are correct and landrover should have stuck to it but as usual no pennies for tooling investment :doh:
regarding the orginal american production method you are correct and landrover should have stuck to it but as usual no pennies for tooling investment :doh:
- Posts
- 58,170
- Location
- Preston Lancs.
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
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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
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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
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- South Hampshire
correct , luckliy my one had had a warenty alusil block fitted before I got it at a parts cost of £1700 in 1995!!
