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Old 11-25-2005, 12:09 PM
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Originally Posted by Darth Vader
Hi Ed & Chris,

I took my engine apart and took some pics.
A couple of things puzzle me.

1) The sleeve in the PR12 is supposed to be bi-metal right?
Shouldn't there be a weld line round the middle of the sleeve where the 2 metals are welded? I remember seeing a picture of the bi-metal sleeve on this thread and there was a faint line round the middle of the sleeve. Or am I totally mistaken...?

2) I have heard that the piston and sleeve fit should be really tight and gets stuck at TDC. But with my engine, I can turn the crank around by hand after mounting the flywheel. Seems like there's little compression. It's not even run in yet. Is this normal with the PR12?

Hope you can clarify my queries before I run in the engine...

It is depend which version of motor you get-if it is BRB, will be no welding line, if it is Bi-metal then you will clearly see welding seam.
About fitting of piston-we don't make them very tight to save time and fuel on run in process. It still will take 10-12 tanks to have fully run in.
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