JagoBlitz Posted February 23, 2023 Share Posted February 23, 2023 (edited) Hello, I own a 280Z and in the book "How to Modify Your Nissan & Datsun OHC Engine" by Frank Honsowetz he describes enlarging the oil-jet from 2.0 mm to 3.17 mm to increase oil flow to the head to improve oil lubrication of the Cam and rocker arms. I found out that the L28ET uses a different oil pump and different oil jets. Unfortunately, I cannot find the bore size of these jets anywhere and I am really curious if the Nissan engineers increased the oil flow to the cylinder head for the Turbo version. Does anybody have the opportunity to measure the openings of the oil jets for me? Thank you very much. Edited February 25, 2023 by JagoBlitz Quote Link to comment Share on other sites More sharing options...
A to Z Posted February 25, 2023 Share Posted February 25, 2023 The little bit I do know about this, is that you need to upgrade your oil pump to a 280ZX turbo pump to handle the excess oil flow. Quote Link to comment Share on other sites More sharing options...
A to Z Posted February 25, 2023 Share Posted February 25, 2023 Shoot Tony D a PM on here. If you ask him nicely, he may help you out. Quote Link to comment Share on other sites More sharing options...
JagoBlitz Posted February 25, 2023 Author Share Posted February 25, 2023 1 hour ago, A to Z said: The little bit I do know about this, is that you need to upgrade your oil pump to a 280ZX turbo pump to handle the excess oil flow. I already have the turbo pump, but I just found out that also the oil jet sizes are different and I would like to know how the Nissan engineers modified them as well. Are there any other changes I should be aware of? Quote Link to comment Share on other sites More sharing options...
jonbill Posted February 25, 2023 Share Posted February 25, 2023 Why not order some and measure them? They look cheap enough. Quote Link to comment Share on other sites More sharing options...
JagoBlitz Posted February 25, 2023 Author Share Posted February 25, 2023 That's plan B. The problem is that I live in Germany and they are not anywhere on stock here and my engine is already at the machine shop. And the oil jet at the front seems to be discontinued. Quote Link to comment Share on other sites More sharing options...
jonbill Posted February 25, 2023 Share Posted February 25, 2023 Can't the machine shop measure what they've got? Quote Link to comment Share on other sites More sharing options...
JagoBlitz Posted February 25, 2023 Author Share Posted February 25, 2023 I don't have a turbo engine block so there's nothing to measure. Quote Link to comment Share on other sites More sharing options...
A to Z Posted February 26, 2023 Share Posted February 26, 2023 20 hours ago, JagoBlitz said: I already have the turbo pump, but I just found out that also the oil jet sizes are different and I would like to know how the Nissan engineers modified them as well. Are there any other changes I should be aware of? Give Godzilla Raceworks a call. The are into Turbo builds Quote Link to comment Share on other sites More sharing options...
JagoBlitz Posted March 2, 2023 Author Share Posted March 2, 2023 (edited) The Turbo Oil Jet between the 3rd and 4th cylinder has a diameter of 2.5mm. Edited March 2, 2023 by JagoBlitz Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted March 4, 2023 Share Posted March 4, 2023 If you're getting a "turbo pump" make sure you go the extra step for a "turbo Auto Pump" or get one from something like a Z24 truck engine. Quote Link to comment Share on other sites More sharing options...
JagoBlitz Posted March 4, 2023 Author Share Posted March 4, 2023 What exactly is the difference? Part number? Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted March 12, 2023 Share Posted March 12, 2023 Check this thread out.......it has information. I believe the earlier KA24s (s13 engine) had a pump as large as the turbo pump. Quote Link to comment Share on other sites More sharing options...
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