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Talk about engine building here. New products, tricky questions or showcase your work - If it's engine building related it's welcome here.
= Resolved threads
I am trying to figure out the best approach to tighten up some clearances on an engine I'm building. I have a 2jz that is going back in my MKIV supra that will primarily be street driven with some occasional highway pulls and trips to the drag strip. I should be around 900whp with the setup I have with e85 but will run pump at times so flex fuel.
I measured rod bearing clearances with standard size ACL bearings and about 3 of them were 0.0025", which is on the loose side for a 2.04" journal diameter. I believe most builders would target 0.0020".
With this said, should I worry about that extra clearance? If so, I would like to tighten them up about 0.0005" and I believe I could achieve this getting a set of +0.001" (tighter) and running one +0.001" bearing and one STD size bearing to make up the 0.0005" of clearance.
Thanks
Yes, this is an acceptable practice, providing you're using bearing shells from the same manufacturer. The only warning I'd add is that this needs to be well documented as it's easy to overlook this at a later stage if the engine is freshened up, perhaps by another engine builder, and the wrong bearing shells are installed.
