alistairolsen
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| posted on 6/1/11 at 08:15 AM |
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The plenum shown in the OP is a pretty poor design IMO, I'd be looking at something like the pulsar plenum if it will fit.
My Build Thread
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hobbsy
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| posted on 6/1/11 at 08:53 AM |
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I don't know if he's done any forced induction plenum's but TrevD on here is very good with aluminium and TIG and has made a few
airboxes for NA.
He's very local to me (also in Northampton) and so not too far from you either.
He's also fairly recently set up his own business (mostly does very sexy car bodies for equally expensive cars - DROOL!):
http://www.circuitmotorbodies.co.uk/
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CNHSS1
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| posted on 6/1/11 at 10:19 AM |
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flak monkey
liking that, very ingenious! 
the Pulsar is indeed an SR20DET, but its a fair bit different than the RWD SR20DET as its based on the FWD SR20. The Pulsar SR uses individual
throttle bodies per cylinder as it was homologated for rallying, whereas the RWD Sr20 uses a single TB on the end of the plenum.
Bellhousing patterns are different too, just to make life difficult!
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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matt_gsxr
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| posted on 6/1/11 at 12:20 PM |
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quote:
Originally posted by alistairolsen
The plenum shown in the OP is a pretty poor design IMO, I'd be looking at something like the pulsar plenum if it will fit.
The centre entry design is ubiquitous for motorcycle designs and the symmetry helps encourage even airflow. The fact that the air
"turns-around" means that momentum effects (i.e. all the air shooting into one inlet tract) will be reduced, which will reduce efficiency
but should allow even air into each tract (which is important with EFI).
Big CC do have a race plenum, which is probably more efficient, but would be even more difficult for me to fabricate.
According to A.G.Bell (Forced induction tuning). It is more tricky to do the packaging though in a car, which is probably why the car ones have air
from the end. But flowing from the end has potential problems from the momentum effects of the inflowing air.
I do like that pulsar idea though. I guess I will keep my eyes open on a certain website.
Matt
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matt_gsxr
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| posted on 6/1/11 at 12:27 PM |
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quote:
Originally posted by hobbsy
I don't know if he's done any forced induction plenum's but TrevD on here is very good with aluminium and TIG and has made a few
airboxes for NA.
He's very local to me (also in Northampton) and so not too far from you either.
He's also fairly recently set up his own business (mostly does very sexy car bodies for equally expensive cars - DROOL!):
http://www.circuitmotorbodies.co.uk/
Thanks, I hadn't realised he was that local.
If I get a plan together he'd be excellent.
Matt
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NS Dev
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| posted on 6/1/11 at 12:36 PM |
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quote:
Originally posted by flak monkey
The main bit of the plenum is just bolted on, so you can change the backplate to whatever you like if you can get the parts laser cut. The Pulsar is a
modded version of the SR20 engine yes.
This is the bit you need:
Then I had these bits cut:
To this:
Would have suggested exactly what you've done David but thought it would be too big for a bike engine in terms of length.
We were looking at a pulsar inlet for the engine in the kadett but we reckon (with no scientific backing!! ) that the volume is a bit low for beyond
500hp........velocities are probably getting a tad high which will make flow imbalances very likely (as they are now when we go for over 28psi on the
current fabricated plenum)
We're looking at either a lot of money on a Jenvey plenum (which looks to me to have been CFD'd for laminar flow maybe???) or a similar
thing, i.e. a 3 piece plenum ( backplate with trumpets, cover with inlet and intermediate plate with guide vanes) that we fabricate............bit
stuck really!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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matt_gsxr
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| posted on 6/1/11 at 02:14 PM |
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My bore spacing is 86 102 86 (from memory, turns out 86 92 86, although that isn't the bore spacing but the TBI spacing)
Duratec is about 102 102 102 so not so different.
sr20det is 107 107 107 so a bit longer, fair comment NSDev
I have acres of space too, existing air box (NA) is 10 litres or so.
The problem will be finding a GTiR plenum is suspect as googling around shows this mod to be quite popular (unlike the original car). Great idea
though, and very impressive work (as ever) David.
Matt
[Edited on 6/1/11 by matt_gsxr]
[Edited on 6/1/11 by matt_gsxr]
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CNHSS1
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| posted on 6/1/11 at 02:48 PM |
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guy breaking a pulsar here
http://www.pistonheads.com/sales/1809593.htm
and another
http://www.pistonheads.com/sales/2366736.htm
and another
http://www.pistonheads.com/sales/1618525.htm
complete inlet mani here
http://www.pistonheads.com/sales/2331183.htm
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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matt_gsxr
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| posted on 6/1/11 at 03:37 PM |
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I guess I was looking on the wrong site.
Matt
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carpmart
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| posted on 6/1/11 at 04:37 PM |
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quote:
Originally posted by matt_gsxr
I guess I was looking on the wrong site.
Matt
Not anymore though eh! 
You only live once - make the most of it!
Radical Clubsport, Kwaker motor
'94 MX5 MK1, 1.8
F10 M5 - 600bhp Daily Hack 
Range Rover Sport - Wife's Car
Mercedes A class - Son's Car
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RazMan
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| posted on 6/1/11 at 05:14 PM |
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That plenum looks like a suitable alternative to the (rather expensive) Pipercross PX600 airbox.
Mind if I ask how much the new backplate machining would cost?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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flak monkey
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| posted on 6/1/11 at 05:28 PM |
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Andyw7de cut the backplate and spacer for me - if anyone else goes that route then give me a shout and I'll send the dxf's across which
would just need the centre's changing on the big holes. I honestly can't recall how much all the bits were, but it was around £60-70.
You could increase the plenum volume to whatever you like depending on what thickness spacer(s) you use.
Sera
http://www.motosera.com
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RazMan
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| posted on 6/1/11 at 05:49 PM |
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Thanks for the info David - I feel a cunning plan coming on
You have U2U
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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matt_gsxr
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| posted on 6/1/11 at 06:01 PM |
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Interestingly I bet the spacer will cost the same to make up as the back plate as they use the same amount of material and also a similar amount of
cutting.
No reason not to cut with a bandsaw though and do a bit of file work, although its nice getting pre-made bits in the post isn't it.
Matt
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matt_gsxr
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| posted on 6/1/11 at 06:33 PM |
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Just ordered one
WWW.GTI-R-US.CO.UK
£25 + £10 postage
Matt
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