jacky4566 Posted September 29, 2016 Share Posted September 29, 2016 Has anyone ever investigated adding VVT to the L series heads? Seems like it would be "easy" given the first cam tower is removable and has an oil feed. In my mind one would simply need a new front cam tower with integrated solenoid a custom camshaft and an adjustable cam gear from a chain driven engine. Just curious. Quote Link to comment Share on other sites More sharing options...
Leon Posted September 29, 2016 Share Posted September 29, 2016 1 Quote Link to comment Share on other sites More sharing options...
Pillar Posted September 29, 2016 Share Posted September 29, 2016 Thanks Leon, you made my morning Quote Link to comment Share on other sites More sharing options...
Tony D Posted September 29, 2016 Share Posted September 29, 2016 Piece of Cake, just buy the Datsunworks DOHC head then you only change the timing of the cam that makes a difference, and not both of them.... Quote Link to comment Share on other sites More sharing options...
Leon Posted September 29, 2016 Share Posted September 29, 2016 Thanks Leon, you made my morning Quote Link to comment Share on other sites More sharing options...
Leon Posted September 29, 2016 Share Posted September 29, 2016 But in all seriousness, this is not a trivial task. The question to ask is, is it worth it? Engineering R&D is not cheap. If you're up for it, please do it! I'd love to see the execution and results. Quote Link to comment Share on other sites More sharing options...
Derek Posted September 30, 2016 Share Posted September 30, 2016 I can tell you from experience it's a bitch to make something like VCT adapted to an engine to work. Getting the oil to it is the least of your problems. Quote Link to comment Share on other sites More sharing options...
vinceqn Posted October 21, 2016 Share Posted October 21, 2016 Didn't OS Giken make a limited run for almost $20k a piece? Quote Link to comment Share on other sites More sharing options...
Zipper Posted October 21, 2016 Share Posted October 21, 2016 Didn't OS Giken make a limited run for almost $20k a piece? I have faith that Derek will easily half that price. ***complex milling sounds*** Quote Link to comment Share on other sites More sharing options...
Derek Posted October 21, 2016 Share Posted October 21, 2016 I have faith that Derek will easily half that price. ***complex milling sounds*** Hold my beer, I got this. Quote Link to comment Share on other sites More sharing options...
Tony D Posted October 22, 2016 Share Posted October 22, 2016 Didn't OS Giken make a limited run for almost $20k a piece? No, they did not. You guys realise on a single overhead cam engine, you don't do "variable valve timing" because there's no way to alter the phase relationship of intake and exhaust cams on the same cam blank, right? Please, someone ... anyone ... restore my faith! Quote Link to comment Share on other sites More sharing options...
Leon Posted October 22, 2016 Share Posted October 22, 2016 No, they did not. You guys realise on a single overhead cam engine, you don't do "variable valve timing" because there's no way to alter the phase relationship of intake and exhaust cams on the same cam blank, right? Please, someone ... anyone ... restore my faith! VTEC yo! Quote Link to comment Share on other sites More sharing options...
KidandhisCar Posted October 22, 2016 Share Posted October 22, 2016 On alot of the midsize Cat truck engines,3406,3456 etc,they had single cam vvt. They worked by having a a "rack" over each set over cylinders(straight 6). The rack was fed with with engine oil,that when actuated by a solenoid in the rack,would push down a little pawl on the bridge for the intakr valves on that cylinder.Cat calls it VVA,variable valve actuation. Quote Link to comment Share on other sites More sharing options...
jacky4566 Posted October 22, 2016 Author Share Posted October 22, 2016 Haha Tony D your probably my favorite person on this forum. But your right. On a SOHC you cant change the relationship between intake and ext. But changing the cam timing should change the peak hp rpm right? So it stands to reason that vvti type system should still have benefit on a SOHC. KidandhisCar that sounds like a vtec type system? Its changing the valve lift right? I did see that Mahle developed these trick camshafts. http://www.mahle.com/mahle/en/news-and-press/press-releases/mahle-camincam-variable-valve-train-increases-torque-significantly.jsp Super cool idea! Probably cost 20k though. Quote Link to comment Share on other sites More sharing options...
KidandhisCar Posted October 22, 2016 Share Posted October 22, 2016 (edited) It doesnt change how far the valve opens, just how long it stays open. Its pretty neat,its only on the ohc engines,as on a pushrod engine the pushrod would fall out. Also,i said the actuator pawl pushes on the bridge,that was a typo,it pushes on a flat spot on top of the rocker,wich pushes on the bridge. You'll probably ask, what happens to the roller on the back of the rocker when it slams back onto the cam when the actuator lets off,well....thats probably why roller failure is pretty common on those engines haha. Edit: here's a pic of it Edited October 22, 2016 by KidandhisCar Quote Link to comment Share on other sites More sharing options...
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