mk1 xr2 crossflow - score in cylinder of crossflow engine

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Mon 29 Aug 2011 15:36
mk1 xr2 crossflow - score in cylinder of crossflow engine - AJP

I got a crossflow from an xr2 to put in my mk1 fiesta but after taking the head off to inspect it i found a score in the first cylinder, it's about 2 inches down and runs down below the piston, it's probably about 0.3mm deep, will this affect the engine much? will it need reboring?

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Mon 29 Aug 2011 17:40
mk1 xr2 crossflow - score in cylinder of crossflow engine - unthrottled

Technically it does need reboring, but the cost is prohibitive. If the source of the scoring can be identified you could try soldering it. This used to be a popular cheap fix.

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Mon 29 Aug 2011 20:42
mk1 xr2 crossflow - score in cylinder of crossflow engine - Peter D

And how are you going to raise the cylinder wall to in excess of 190 degrees C. This could be a busted ring that caused this damage. Regards Peter

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Mon 29 Aug 2011 20:58
mk1 xr2 crossflow - score in cylinder of crossflow engine - unthrottled

It could be, but a rebore, hone and a set of oversized pistons just isn't warranted on an old Kent engine. If the rings are ok, bodge it and get the head back on.

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Mon 29 Aug 2011 21:13
mk1 xr2 crossflow - score in cylinder of crossflow engine - bathtub tom

I've heard of scores like that being filled with, well, filler. Perhaps one of these products advertised as 'chemical metal' would do the job.

It's not as if it has to take the wear of the rings, the metal either side of the score will do that. It's the combustion process, oil and fuel that could destroy it.

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