RCU Forums - View Single Post - Tapered-Bore Engine Break-in

06-19-2010 | 10:07 AM

#293

DarZeelon

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From: Rosh-HaAyin, ISRAEL

RE: Tapered-Bore Engine Break-in - Upgraded

BW,

I (and several others here) do not think Le Fou needs to replace the sleeve in his engine...
Only Le Fou, after reading this thread (and probably Dub Jett's break-in procedure...) thought that a problem exists, because the pinch at TDC was not as tight as he thought it should be, after break-in...

If any engine manufacturer(s) actually thought following the technique outlined in this thread, could actually compromise the well-being of their tapered-bore engines, he/they would have 'chimed-in' and written something to indicate this...

None have and also, even OS did not go into the Q&A of their US rep and 'removed' the 'harmful info' that contradicts their manual...

So far, it seems, the only person of the over 22,000 who have seen this thread, who actually thinks following it may be harmful to engines; is you!
You seem to also be the only one who assumes the manufacturer's PR people, actually know what they are talking about...

While many engineers do take pride in their work, it is not engineers who write most manuals.
If they did, the manuals would not have contained WRONG break-in instructions.

I don't think a tedious and elaborate process is used to produce any sleeve, of any manufacturer...
It is probably machined bar-stock, before getting its plating/coating and final machining.

Current sleeves are cross-hatch finished to the final taper (not wrought, stretched, Etc.)... I have seen previous generation MVVS sleeves, that have hand-polished sleeves and a pretty tight TDC pinch!
No costly alloy is used for sleeves either... As it is they already cost nearly their weight in gold...

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