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Posted by Mikey P (93 SE) on August 09, 2002 at 08:33:16:
In Reply to: Engine rebuild update >>> posted by The Max on August 08, 2002 at 19:21:54:
Also, you may not see any improvement in oil flow through a stock block, but if you are able to smooth out/ debur the oil return holes and passages you should be able to improve flow and see some benefit from an oil pump upgrade. Maybe the builder doesn't want to do that because it can be a time intensive process; more time than he has. Could you steal the block back from him and do that work yourself? You can buy dremel kits that will come with an assortment of bits with various grits. Hey that rhymes. Okay, that's my $.02 -MP : He advises against a bigger flowing higher pressure oil pump as what was suggested by Kaleb simply because he feels the turbo won't rob the oil pump of anything in any significant amount and the pump can only put out as much as the oil galleries allow for anyway. Seems logical. He did say that he'll be checking the oil pump and as long as it's still in pristine condition, he'll continue to use that one. : The pistons are another matter. Now that they're definitely lighter, it means blueprinting/balancing the whole assembly ... from pistons to crank. No concrete word on whether we'll actually be using the Z32TT crank (the snout needs machining to fit the oil pump and besides, it was grazed by the air chisel used to get the rusted timing belt cog off). Nevertheless, it is definitely in the picture so hopefully something good will come of it. : We've only discussed bottom end so far, so I'm not too sure what the story is with the top end (valves, lifters, etc). I'm sure if there was a major issue, we would've discussed it by now but maybe he also needs reminding when it's all ready to be slapped together again. I'm going to place an order with my dealership for the exhaust studs just to make sure that they'll handle the extra heat and more importantly, so I don't have to do any friggin' more motor work if I can avoid it!!!!! : So that's it thus far guys. More updates in 1.5 weeks when I speak to him again.
Coming from an american V8 background I would say that it is standard procedure to replace the oil pump during any engine rebuild. Do people not always follow this for imports? I know there are price things to think about. You can probably get a small block chevy pump for around $30, but I'm sure the Nissan one is much more. Maybe the failure rates are significanty lower.
: Handed over pistons (and Z31T water pump) to my engine builder. He's keen to get the motor completed ASAP, which is good news because it means I won't have to kick his arse for being so damn slow with it!!