Jellybean Posted March 10, 2015 Share Posted March 10, 2015 Taking the VQ35 as an example , how does quad cam engine work? I presume they have twice the amount of valves as a twin cam , but it is a conventional Piston Engine , I am confused at what point on the crank stroke would it merit to have an additional cam? Or do both cams run in tandem and its just a means to get more fuel in there? I suppose Valves can only be so big Quote Link to comment Share on other sites More sharing options...
Luxluc Posted March 10, 2015 Share Posted March 10, 2015 On a V-engine, you have 3 cylinders on one part of the V, 3 on the other. The intake cam for the left 3 cylinders needs to by syncronised with cam for the 3 cylinders on the right ; the same applies for the exhaust cams. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted March 10, 2015 Share Posted March 10, 2015 On V engines you have two cylinder heads, two cams per head = Quad cam Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted March 10, 2015 Share Posted March 10, 2015 The 2JZ-GTE is a straight-six DOHC engine. Weld two together and you've got a V12 quad-cam Quote Link to comment Share on other sites More sharing options...
masterfett Posted March 10, 2015 Share Posted March 10, 2015 like this http://www.engineswapdepot.com/?p=3134 Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 10, 2015 Share Posted March 10, 2015 http://www.chriswilson.tv/mugen/mugen.html my V8 Honda Mugen from my Lola F3000 3 litre 480 BHP quad cam N/A Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 10, 2015 Author Share Posted March 10, 2015 I was not expecting that , I was expecting 4 cam shafts not a camshaft with twice the lobes I reckon that puts a smile on your face and a lot of something in your trousers Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted March 10, 2015 Share Posted March 10, 2015 (edited) I was not expecting that , I was expecting 4 cam shafts not a camshaft with twice the lobes I reckon that puts a smile on your face and a lot of something in your trousers That's only one of the heads, there's an identical one on the other side. As the name implies, there are 4 cams in a quad cam engine. The 1UZ is a quad cam, as are most modern V engines. One of the biggest departures is VW's VR architecture, which although is technically a narrow V engine, only has one head, and so only a pair of cams. The W architecture engines used in the Veyron and Continental GT are quad cam too. Edited March 10, 2015 by j_jza80 (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 11, 2015 Share Posted March 11, 2015 Pah, Lancia had a single head V4 in 1963 http://www.carthrottle.com/post/obsolete-engines-101-the-mythical-v4/ Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted March 11, 2015 Share Posted March 11, 2015 They sound incredible, but are hardly commonplace I've spotted a tired looking Lancia Montecarlo on a local industrial estate. I'm half tempted to make an offer on it, but suspect they can be money pits Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 11, 2015 Share Posted March 11, 2015 Very pretty coupe, Fiat twin cam engine, mid mounted. But a REAL rot box and I am told no panels are available any more. The wife was after a Renault Alpine GTA like I used to have years ago, but similarly there is hardly any stuff available for them any more. Glass is all but impossible, no panels, some bespoke gear ratios not available, no head gaskets. None starter, in my opinion for a daily driver, thank God she went mainstream in the end. I also managed to talk her out of a Cayman, I had visions of constantly working on the gutless lemon, or the intermediate shaft bearing going and rendering the engine effectively scrap..! How Porsche sell such @#~& I don't know. Quote Link to comment Share on other sites More sharing options...
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