At 08:52 AM 3/3/98 +0000, you wrote:
>Do you not mean running in. From what a friend tells me from
>doing his 2.5Pi you need to break-in the engine, that is, use
>almost no torque, and leave off the top revs. 2/3 throttle
>max. This has to be maintained for at least if not more than
>the initial running in period, because the tolerances are not
>as good.
Engine yes; bearings and thrust washers, no. The difference is that piston
rings need to be seated into their bores.
>At a guide, you should keep the revs between 2500-3000 to 4000
>RPMs. Your engine in that region should be as gentle as possible.
I believe you are talking about tappet break-in here. This higher rpm
requirement is used to insure the tappets rotate within their bores to
insure they break in evenly. The rockers impart a spin to the tappets.
>Use a running in oil if you want to do it properly, ether that
>or use a really cheap oil. You defiantly don't want to use any
>synthetic oil, or anything that stops engine even ware.
I believe a standard oil is much better for break-in than synthetic, but
for bearings and thrust washers, I believe synthitic would be fine, as
there are no contact surfaces like you would have with piston rings.
>The art or running in, is to ware the engine in so that you do
>as little damage to it as possible when it's most delicate.
Exactly.
>James Carpenter
>Yellow '79 spit wired by a trained marmot
Jack Brooks
'60 TR3A
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