Almost all reputable kits use a single seal bearing to facilitate splash lubrication.There has been a huge amount of discussion on this and few dispute its positive results.
Some diy guys removed both seals .They did not read the oil-in-the-ims-tube discussions.
The potential flaw in the 1RS IMSB proposal is filtration.That can be addressed by a filter upgrade.
But this is just one part of the total subject
The TuneRS kit has the oil line but you can choose not to fit it. If you check experience mentioned by JFP ,you;ll note some serious problems with using the supplementary oil line fed by the port on top of the camshaft cover.
Quote:
Originally Posted by thom4782
Sealed bearings are great until...
Over time acids and other contaminants in the oil cause IMS bearing seals to degrade. When this happens, leaking oil causes the grease to wash out. When the grease is gone, splash oil isn't sufficient to lubricate the bearing because not enough oil gets through the seal to adequately lubricate the bearing. With too little lubrication, the bearing fails eventually.
BTW: if you don't buy what I've said, why do you think aftermarket suppliers like LN and TuneRS use unsealed bearings as their fixes to a design flaw?
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