Andzey Posted October 4, 2019 Report Share Posted October 4, 2019 Hi guys! I was about to swapping the head from my 1999 early RN to 2005 S60R. Accordingly I would delete the intake VTT and leave operational exhaust VVT. There are some doubts with the VVT hub itself. The early version hub coming from my 1999 engine has back-spring therefore it is fully back rotated to max retarded position, while B5245T4 hubs rotate freely without any back-pressure. Do you have any guess, how would my 1999 ECU and solenoid react on spring-less hub, or are there any success stories of swapping later (2004-07) RN VVT cams and hubs into earlier RN engines? Link to comment Share on other sites More sharing options...
Ihatespeedbumps Posted October 4, 2019 Report Share Posted October 4, 2019 Moving this to performance for better exposure. Link to comment Share on other sites More sharing options...
242bleek Posted October 5, 2019 Report Share Posted October 5, 2019 I have a RN head on my 98 N engine. It has the VVT gear on the exhaust side with nothing driving it. It will work fine just be sure that the gear is at full forward lock when installed and to use the proper cam lock tool. You can leave VVT solenoid in place and oil flow will not go to the gear. Link to comment Share on other sites More sharing options...
Andzey Posted October 6, 2019 Author Report Share Posted October 6, 2019 Sure, disabling works by only unplugging the solenoid. My worries are about S60R spring-less exhaust hub, how the early P80 ME7 would addapt it Link to comment Share on other sites More sharing options...
242bleek Posted October 17, 2019 Report Share Posted October 17, 2019 The spring makes no difference. In fact most RN heads ive seen had no spring in the vvt hub me7 included. Im not sure what determines what cars got a sprung hub and which didnt or why its even there but I think that may have been something done early on maybe 99-00. I know P80 C70's made around 04 dont have springs so you should be fine. As long as the gear is fully clocked clockwise and cams are locked in on install it shouldn't matter. Link to comment Share on other sites More sharing options...
Andzey Posted October 21, 2019 Author Report Share Posted October 21, 2019 I just dismantled both the spring and spring less hubs, must say all the components are identical. One just has a spring in one side, other doesn't. The spring definitely helps keeping the hub in max retarded position. Also it seems obviously that in order to reach some cam angle advancement, the oil pressure in a spring-ed hub must reach higher value due to overcome the spring force. I highly recommend checking the hubs for axial play. All my hubs had various wear, but I was able to interchange the guts until complected one nice hub without any play. Link to comment Share on other sites More sharing options...
242bleek Posted October 23, 2019 Report Share Posted October 23, 2019 Still curious as to why none of the whiteblocks after a certain year have it. Any time ive see one its been on a 99-2000 car. Maybe it wasnt needed? Link to comment Share on other sites More sharing options...
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