Hayk928

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

Mrmerlin

it would be less expensive to get another running engine 4.7L

Landseer

Perhaps a straight injection of the 4.5 engine ( if it is complete still ) into the car. That's what I would do.

danglerb

Find a good 4.7L block.

For the brave .... sleeve the bad cylinder.

GregBBRD

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?

GlenL

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.

Hayk928

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

Kiln_Red

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.

blown 87

Been quite a few crack from hydrolocking to TBF and other causes.

9x8

I've seen one cracked by frozen coolant.

danglerb

Sounds like hydrolocked.

Kiln_Red

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.

Landseer

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.

Landseer

Check out the pictures in this thread, post #55 and #75

https://rennlist.com/forums/928-foru...freshen-4.html

Kiln_Red

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.