Why Run In?

[banned advertiser]

I think I heard that at a given rpm the apex seals start to lose compression so have to assume there are bouncing away from the housings or lose the force necessary to keep them there?

[banned advertiser]

Dont even start on oils, it aways gets messy.

[kev-yorks]

The oil type doesn\'t even come into it Gary even if we all ran mineral it still bears no resemblance to what it was 10yrs ago. It comes out of the ground and is called oil still, but the addative list that is put in is pretty extensive nowadays

[RemarkLima]

I thought the apex / side seals were the smae as piston rings, in as much as, it\'s LOAD that compresses them against the side / rotor housing (or Cylinder wall).

So not revs that are important, but LOAD of all different types, but make sure you get full throttle even if it\'s from 2000 rpm to 4000rpm. This would force the seals out and surely bed in quicker?

[iaint]

I think I heard that at a given rpm the apex seals start to lose compression so have to assume there are bouncing away from the housings or lose the force necessary to keep them there?

The force for teh end seals will only ever increace with RPM - think about a kiddies roundabout - the faster it spins the harder it is to hold on.  Side seals may well be different though...

[Brett]

Interesting thread this

Having only ever done \'homers\' I can\'t comment on the warranty aspect.  However given personal experiances and the amount of work involved on any rebuild, be it the old capstan lathe I used as an apprentice or the 13B rebuild on my first Rx7 I would always want to stick religiously to running in guidlines.  IIRC I used a 1000mile running in period, with engine speeds no higher than 4500rpm, but kept the revs pretty varied during that period.  The amount of bedding in required will be (previously stated) dependant upon the number of new surfaces.  It is my understanding that during this intial period (I think this is what Trex is reffering to) you are allowing the components time to clearance against each other.  I know how different these engines feel from 0 miles to 1000 to 5000, to 15000, to 155000 and I because of that I fall firmly into the \'Run it in properly\' school of thought. :wave

[kev-yorks]

Any clearancing should be done on the build though Brett.
 
Kevin