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Twinky plenum chambers
https://ausmini.com/forums/viewtopic.php?f=5&t=77897		 Page 1 of 1
Author:  TheMiniMan [ Sat Aug 04, 2012 11:03 am ]
Post subject:  Twinky plenum chambers
Kenno was hitting on a plenum chamber subject a little while ago but i can`t find it anywhere so i`ll throw these pics up here & everyone can have a gork :-)

we used to make round (cylindrical) plenums but now we make square (rectangular) ones--> i know that may not make much sense but still, the pics will tell the story better

This is about all these particular hi-los are good for :-) & even then they`re not that good at that either :-) but still , it`s what i use to make my ram tubes :-)
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i cut short tubes of alloy & put them in the press ontop of the hi-lo & press away , down to a pre-described point, bang the hi-lo out & hey presto,,, one nice neat cheap ram-tube pipe ready to weld into my plenum/box thing
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then we cut out a piece of alloy RHS , mark it then cut & shape it up to suit
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they come out a treat when welded & the flange plate for the throttle body is fitted

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we taper the bottom of the plenum to help direct & ram/squeeze to share the air more evenly between the inlets,,, but also to help clear the alternator underneath the end of it :-) :-) ;-)

i`m trying to find more pics of this stuff but they`re in this computer somewhere :-)

some of our old stuff here,,, inlet plenums & exhaust manifolds & extractors & their respective Jigs-->

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nice shiny bling-bling ceramic coated ones now too :-)
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more to come
Author:  Kennomini [ Sat Aug 04, 2012 12:01 pm ]
Post subject: 
Here it is Matt http://www.ausmini.com/forums/viewtopic ... be+designe
So your new design has the trumpet flush with the edge of the plenum where as the old round design had the trumpet half way inside the plenum correct :?:
I'm planing on doing a hybrid of both those designs. I'm trying to use as long runners as I can mounted half way inside a rectangular plenum. I figure the BMW air box has (roughly) 7" 90* runners so I figure if BMW had long ones I want long ones. Now I just need to get off my but and actually build it like you've done Matt.
Author:  TheMiniMan [ Sat Aug 04, 2012 12:14 pm ]
Post subject: 
yeah that`s correct

& yes i`d like to have long runners inside the plenum but i figure the whole length of the inlet system, throttle body & air filter assy included will do me, as it`s all still a decent sized "mass" of moving air once the engine is running :-)

for a naturally aspirated thing i`d like to do some more homework on longer individual runners yes, for sure, there`s merit there for sure & totally agree it will be well worth the effort,,, but with the turbo donks i`m VERY happy with what we have, there`s PLENTY of grunt :-) More than enough really :-) & absolutely Zero Lag :-) just beautiful wonderful response with lovely usable power delivery :-)
Author:  dalmeny [ Sat Aug 04, 2012 10:29 pm ]
Post subject: 
Ok Matt, you have got my ears pricked up!. So does this mean my naturally aspirated set up with the BMW throttle bodies will need one of these plenum's. And I assume it has some sort of air filter attached to the end of it? Because I was picturing the 4 throttle bodies with filters on each one.

I also see the photos of your set ups of engine pipes on a jig for the extractors. Wouldn't they be a standard length and bend for all minis? If so do you have any left?

Steve
Author:  mini_mad_matt [ Sun Aug 05, 2012 12:16 am ]
Post subject: 
Different Matt but i'll answer anyway

You can run the 4 throttle bodies with filters on each one, or make an air box for all 4.

Matt's plenum chambers are designed to be used with a single throttle body (ideal for turbo applications but still works with N/A). So the single throttle body feeds air to the plenum chamber, which all 4 cylinders draw from. You can then have some type of air filter before the throttle body. Pretty much all modern cars have a setup like this. Air box/filter -> throttle body -> plenum chamber(inlet manifold) -> cylinder head.
Author:  TheMiniMan [ Sun Aug 05, 2012 2:21 am ]
Post subject: 
yep, Matt`s right :-) i make the plenum chambers for turbo applications

& yes you can just run filters on the ends of your std BMW throttle bodies.

& the bottom piece of the extractors that you see in the photos were an early attempt to cater for all types of minis & mokes but they don`t fit everything,,, different shifters & different angles & different heights meant it needed to be modded each time we fitted one up,,, hence why i dropped the lower piece out of the equation.

it`s best to have that part made up to suit each different application... i`d much rather people have trouble understanding that part than complain that my bits don`t fit & need modifying :-)
Author:  dalmeny [ Sun Aug 05, 2012 2:13 pm ]
Post subject: 
Thanks Matt's, I'm still learning :wink:

Steve
Author:  Kennomini [ Sun Aug 05, 2012 3:13 pm ]
Post subject: 
If it's going into a clubby you'll have more room for decent inlet runners and good filters, I'm doing a plenum on my round nose simply because I cant fit all that stuff in front of the head.
Author:  TheMiniMan [ Sun Aug 05, 2012 3:47 pm ]
Post subject: 
oh yes, sorry Steve,,, & thanks for mentioning that Kenno

yes you can run a plenum before the Quad-throttle bodies on a clubby , similar to what we make for the tubos , simply because you have the room,,, & then with that lot you can run a single air filter at the end of the plenum if you like

& in that circumstance i`d call it an air-box more than a plenum, but still it`s similar

on mokes & roundys tho i`m afraid there`s just not enough room
Author:  dalmeny [ Sun Aug 05, 2012 8:40 pm ]
Post subject: 
Yeah, definitely a clubby so I hope it will fit without bonnet mods.
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