out_riding Posted December 28, 2014 Share Posted December 28, 2014 I have a built 3.0 with a Rebello prepared block and crank running a turbo oil pump and Rebello's oil bypass modification. The oil pressure is fine at idle, but at speed, it runs right around 100 psi. Does anyone know of a lighter spring for the oil pump or an easy way to adjust the pressure? I have a mechanical autometer gauge, so I am sure this is the pressure. My engine seems to find leaks where there would normally be none. Any real world experience would be sincerely appreciated Quote Link to comment Share on other sites More sharing options...
NewZed Posted December 28, 2014 Share Posted December 28, 2014 (edited) Rebello probably knows. Probably interested in what you're thinking of doing also, I would guess. You could call him. Here's a book that describes modifying the pump's relief pressure - http://www.amazon.com/Modify-Your-Nissan-Datsun-Engine/dp/1931128049 Forgot to say - the stock senders and gauges aren't very accurate, if that's where you're getting the "100" from. Best to verify with a directly-mounted gauge on an oil passage first. Edited December 28, 2014 by NewZed Quote Link to comment Share on other sites More sharing options...
Tony D Posted December 31, 2014 Share Posted December 31, 2014 What weight oil are you running and is it the weight Rebello recommends? Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 31, 2014 Share Posted December 31, 2014 I agree with NewZed. Check the pressure with a mechanical gauge before doing anything. Quote Link to comment Share on other sites More sharing options...
Tony D Posted January 1, 2015 Share Posted January 1, 2015 "I have a mechanical autometer gauge" Is it me...or does this say he's already GOT a mechanical gauge? Quote Link to comment Share on other sites More sharing options...
Xnke Posted January 1, 2015 Share Posted January 1, 2015 Yes...what viscosity of oil are you running and what is your oil temperature? Quote Link to comment Share on other sites More sharing options...
NewZed Posted January 1, 2015 Share Posted January 1, 2015 I missed "I have a mechanical autometer gauge"Is it me...or does this say he's already GOT a mechanical gauge? Missed that, oops. But Autometer does sell typical electrical sender type gauges. Good to verify that the OP actually has a tube full of oil running to the gauge. I'm curious in general about the Rebello bypass. Does Rebello modify the pump when he installs the bypass? Seems odd to pay for a Rebello motor then get on to an internet forum and ask how to mess with it. Quote Link to comment Share on other sites More sharing options...
z-ya Posted January 2, 2015 Share Posted January 2, 2015 "I have a mechanical autometer gauge" Is it me...or does this say he's already GOT a mechanical gauge? Tony, it's me not reading the entire post. I plug the bypass on the engines I have built, and even with the Wolfcreek adjustable pressure setup, I still couldn't get more than 80psi. And this was with the NISMO pump cover and external pickup. You can get one of these adjustment bolts from Wolfcreek and try to turn the pressure down. I've got a good (bad) Rebello story. I won't bash Dave in public as he is making good on it. Quote Link to comment Share on other sites More sharing options...
Tony D Posted January 2, 2015 Share Posted January 2, 2015 JeffP wrote up his experiences with the Melling Pump on his webpage, he wanted some big number at idle... Don't recall where it tapered off to on the top end. Quote Link to comment Share on other sites More sharing options...
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