cracked 4.7l block + 4.5l spare block - what to do?
#1
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cracked 4.7l block + 4.5l spare block - what to do?
Cheers guys,
I'm asking on behalf of a friend from UK - he's got a 4.7l EURO with a cracked cylinder bore. And he has a nice 79 4.5l whose block he could use.
Would you suggest to bore it to 4.7l or what else? I'm aware of the problem to get the Nikasil cylinders well honed... How much would be such job?
Thanks :thumb:
Marc
I'm asking on behalf of a friend from UK - he's got a 4.7l EURO with a cracked cylinder bore. And he has a nice 79 4.5l whose block he could use.
Would you suggest to bore it to 4.7l or what else? I'm aware of the problem to get the Nikasil cylinders well honed... How much would be such job?
Thanks :thumb:
Marc
#2
Team Owner
it would be less expensive to get another running engine 4.7L
#5
Former Sponsor
Turns out that i have a perfect 4.7 Euro S block, without any numbers. I thought it might have the numbers "ground" off, but after disassembly, it was determined that the block was a factory replacement block.
Probably expensive to ship?
Probably expensive to ship?
#6
Nordschleife Master
Set a budget and dig around for parts. The "S" heads can't go directly on the 4.5l block because of the bigger valves with taller cam. The valves will hit the pistons.
A half-way decent option is to notch the pistons and put the Euro stuff on the 4.5l block. There'll be a loss of power but not nearly as noticeable as going with a 4.5l engine.
Best option is finding another 4.7l block. Can't be too rare in your parts.
A half-way decent option is to notch the pistons and put the Euro stuff on the 4.5l block. There'll be a loss of power but not nearly as noticeable as going with a 4.5l engine.
Best option is finding another 4.7l block. Can't be too rare in your parts.
#7
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Thank you guys,
I'll forward this to my friend. His car is a very nice manual (ex Derek Bell), and he already had bad luck with purchasing a long block that was in worse condition...
@Greg, I'm going to figure out how much shipment to UK will be - probably, thats the best option
I'll send ya a pn
Best
Marc
I'll forward this to my friend. His car is a very nice manual (ex Derek Bell), and he already had bad luck with purchasing a long block that was in worse condition...
@Greg, I'm going to figure out how much shipment to UK will be - probably, thats the best option
I'll send ya a pn
Best
Marc
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#8
Rennlist Member
Do you truly mean to say that the block is cracked or do you mean that one or more of the cylinder bores have scratches? I would be very interested in seeing a picture of the damage. I have never heard of a 928 block cracking before.
#12
Rennlist Member
I have not ever heard of anyone hydrolocking one of these engines either. I have seen plenty of bent rods and damaged bearings as a result of hydrolock on other vehicles though. In those experiences I have almost always found that it was either the result of water in the intake, a head gasket failure, or a cracked head or block. My point is that it seems much more likely, to me, that the cracked block is more often the cause of hydrolock than vice versa.
#13
Rennlist Member
Other way around. These don't crack like a 305 Chevy with its thin jackets
These suffer hg failure due to corrosion at interface and crank binding when thrust bearing is allowed to wear out.
These suffer hg failure due to corrosion at interface and crank binding when thrust bearing is allowed to wear out.
#15
Rennlist Member
Maybe this is an opportunity for me to learn from others experiences then.. Just how does hydrolock cause cracking to an engine's cylinder bore? I've only seen hydrolock cause damage to the rods, bearings and/or crankshaft in my limited experience.