Thought I'd chuck together a compilation [yt]tu_D3v_1lCE[/yt] JUN, for those that don't give a **** about bonnet clearance [yt]lVeA5DxhTQo[/yt] JUN for a customer I think, bonnet included this time, 2:10 onwards someone say **** bonnet clearance? Steve Millen race car One off set up out of the states, had a v-mount, twin high mounts and all that cool shit this looks pretty shit So does this This too [yt]42UW0kaXlOQ[/yt] Would love to see what one of these plenums that's been designed properly looks like, and yes that means CFD analysis -A
Wonder if anyone has ever sunk the intake plenum into the engine below the intake line and whether its even possible (the vapour would have to travel up into the intake instead of down) Just seems to be lots of spare room in the guts with the exception of the coolant hard line Would certainly lower the profile of the entire engine and make it easy to work on with no stock wide plenum or hump in the bonnet..........
http://www.nengun.com/greddy/intake-plenum-nissan-skyline The problem with setting the plenum itself into the valley is you lose the runners. If you want a decent plenum to suit a single turbo without bonnet mods you'll probably be best off with something akin to the DET with two TBs to one side so you don't need a 3-4" throttle body and piping to make power.
Agreed - the runners is the key issue here When you look down there though, it just looks like there's enough room to use a twisted piping style instead of a cast to feed them direct into an inline large throttle intake series pre chamber using low and high pressure areas. In addition you can make use of the height and pyramid space of the lower intake plenum valley to help get the runners length In a high flow motor it could be reasonably practical given less volume / resistance to flow but it certainly would be difficult given such a customised system. Going on facts: How much runner do you need for a High Performance Hi Flow motor, looking at the JUN Blitz would probably give you a good idea without inventing wheel or sinking too much time into it, but what if the same length runner could be incorporated into valley collector pipes instead? In general the two TB's are quite practical and so I agree with you, I was rather just wondering if anyone had done this, given the amount of room in the lower intake plenum valley is fairly significant and some peoples desires to do things different for that "sleeper" look. JC :zlove:
I considered it but it means the idler pulley that connects to the lower plenum needs some kind of mounting point. Ultimately you want the runners as straight and as long as is possible or you'll get a shitty ram.
Other than simplifying the inlet tract and tidying up the engine bay (especially for a single turbo install) what advantage would be gained by going with a centre plenum? I personally think it looks much neater and would love to have a crack at it myself, but only if there is useful gains to be had without introducing more problems. Surely there would a loss of torque at low rpm brought about by shortening the runner length to effectively nothing with the same size or smaller plenum (i.e the simple tube style plenum with a large throttle body on the front).
Sadly there is far more fail here than win. Obviously Jun & the chaps who built Steve Millens car knew what they were doing, some of that other gear though ..... let's just say if it were on a car I purchased it's be finding its way to the scrap metal dealer pretty quickly.
I agree with you Mungo I want something like an LS manifold. Single inlet, long runners inside it still.
Considered posting this last night when they uploaded it but thought it might be more off topic info that's more about telling you your question is wrong than giving a productive answer but since you brought it up... Edit: Looks like the yt embed feature doesn't like timestamps, skip to 12:37 or use this link https://youtu.be/VsmbbuSq9m0?t=12m37s [yt]VsmbbuSq9m0[/yt]
It will have a hump in the bonnet then........you can't avoid it I would think the runner only needs to have the volume of a cylinder to tune a high flow setting (or just above it) The guy in fists video makes the point it would be for top/ high end flow I'm almost tempted to start measuring with the size of that valley just to see even if its possible (for the fun of it) :rofl:
Remember the LS is a 90 degree V too so more room in the valley than the 60 degree VG, going to be harder to get decent length and angle.
:thumbup: It's episode two of a new series from /Drive, I'm liking it, listening to passionate engineers talk about what they do is always fun. First was on heat management, not super technical but still interesting.
Anti the best way to do a LS style one would be from composite. If you cut an LS one open or have a look at a stock VH56 style one they both have runners that wrap around inside which give them a long length and still keep a relatively straight path to the back of the inlet valve. Unless its Sandcast / lostcast or Composite it would be very difficult to achieve one that out performs the standard plenum I would think. From a looks perspective I would keep the dual entry but would have loved to see individual polished pipework from plenum to the intake port. Ala Ferrari/ Alfa style or twin carbon plenums like a Japanese Na zed I have seen.
Yeah I know they do. Decent runner length with a single throttle body. I'm sure a good VG30 single inlet can be done, I'd love to see how an engineer would do it.
