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Main : Mechanical : Fuel Injection Quad throttle manifold 9

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Quad throttle manifold 9
Quad throttle manifold 9Popular
Submitterlamb_daiquiriMore Photos from lamb_daiquiri   Last Update2011/8/20 6:16    Tell a friendTell a friend
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Poster Thread
Posted: 2011/8/24 22:35  Updated: 2011/8/24 22:35
No life (a.k.a. DattoMaster)
Joined: 2008/3/15
From: Melbourne
Posts: 2792
 Re: Quad throttle manifold 9
I like it although I don't think you'll see any results below 3500rpm. It would work well with a turbo or SC

Poster Thread
Posted: 2011/8/24 12:23  Updated: 2011/8/24 12:23
No life (a.k.a. DattoMaster)
Joined: 2009/4/30
From: Adelaide
Posts: 1085
 Re: Quad throttle manifold 9
Should've checked notify on the comments, didn't notice sorry. Questions from the top:

Unfamilia: No bonnet scoop, if you extended the pipe out the other side of the throttle bodies they would just clear the rocker cover. I plan to build an airbox to fit on the manifold side of the rocker cover. More pics when I've cleared my plate a bit and get back to it.

Shoota_77: Can I make you one? Expect to wait a long time, supplied with premade flanges and the bends it wouldn't take long. Chris supplied the head side flange, the other one I made by hand with a drill press and some 6mm flat. Took about 10-15mins to cut each hole with lots of rp7 and a HSS hole saw as my drill press is only 200W.

DDgonzal: Agreed, will definately fit. Thought about going higher and over the rockers to the other side of the bay (which would also fit) but as it is the centreline distance entrance to port will be roughly 600mm, should get the second harmonic at roughly 5500-6500 rpm provided my plennum is big enough, smaller flattens the VE peak and moves it down the rpm band. Bigger plennum means larger narrower peak.

Reuby_Tuesday: Mandrel bends
2-1/2 radius
1-1/2 O/D
tube length 4 from centre of radius
$19.10 from Daaldler in Preston
You can get them marginally cheaper but they are close and I picked up a few offcuts at the same time for nothing (I asked nicely) when I was thinking about extending the runners.
I think I paid about 100 for the throttle bodies with an air box and all 8 injectors, fuel rails etc. CBR1000RR 45mm butterflies, 80-81-80 centres.

ssskiwi: this can be compensated for by appropriate tuning of X-tal type enrichment/ leaning. The other method is to build in modelling of fuel pooling. A control expert at Melbourne Uni did this with regularisation networks (works kind of like figuring out what worked and remembering it). The simplest way is just to increase acceleration enrichment and let it go rich for a bit on deccel.

Sikyne: Sequential would be ideal, megasquirt 3 would be able to cover sequential staged injection for all 8 injectors but is another few hundred bucks upgrading what I've got. I figure I'll give it a go with batch and megasquirt 2 (which I already own) and if it's not good enough upgrade. Give me more time to save the cash and only spend it if I need to. Batch will probably be alright, might just produce a few extra emissions during transients. Still got to be better than the carb that's on it!

D: Plennum. I'll build a box, mount the 2nd row of injectors and plumb the box to behind the grill for nice cool air. The box will probably take as long or longer to build than the manifold, I knocked that off in a few hours after all the thinking was done.

Long post but I think that covers it.

Poster Thread
Posted: 2011/8/22 7:45  Updated: 2011/8/22 7:45
Home away from home
Joined: 2010/2/13
From: Ringwood, Melbourne, AUS
Posts: 924
 Re: Quad throttle manifold 9
I would be concerned with the fuel falling out of suspension due to the 180 degree change in direction, wouldn't the injectors be better off firing into the ports/back of valve area?
All OEM's using long runner intakes still fire the valve at the back of the valve for this reason (actually emmissions but puddling fuel causes bad emmissions).

Poster Thread
Posted: 2011/8/22 4:07  Updated: 2011/8/22 4:07
No life (a.k.a. DattoMaster)
Joined: 2004/2/14
From: Coondle, WA Australia
Posts: 2238
 Re: Quad throttle manifold 9
thats looking pretty good.

how expensive were the mandrel bends to buy?

Ive been considering something like this myself.

Poster Thread
Posted: 2011/8/21 11:23  Updated: 2011/8/21 11:23
No life (a.k.a. DattoMaster)
Joined: 2002/3/7
From: Look who's back in town
Posts: 14015
 Re: Quad throttle manifold 9
That's nice, but how big a bonnet scOop you going tO need?

Poster Thread
Posted: 2011/8/21 23:21  Updated: 2011/8/21 23:21
Home away from home
Joined: 2011/1/9
From: Melbourne, Australia
Posts: 797
 Re: Quad throttle manifold 9
Looks good Dylan. Once this one works you can make me one!

Poster Thread
Posted: 2011/8/22 3:12  Updated: 2011/8/22 3:12
Joined: 2001/5/3
From: Hawaii, USA
Posts: 30847
 Re: Quad throttle manifold 9
I think that will fit under the bonnet of a Datsun 1200.

Poster Thread
Posted: 2011/8/22 13:30  Updated: 2011/8/22 13:30
No life (a.k.a. DattoMaster)
Joined: 2006/6/4
From: Ballarat Victoria
Posts: 1308
 Re: Quad throttle manifold 9
This will work well! Plenty of length and good TB sizing.

The fuel dropping out of suspension wont be a prob, maybe a little at idle. but certainly no worse than a carb at idle.

Are you you going to set it up as sequential or batch fire?

Poster Thread
Posted: 2011/8/22 14:12  Updated: 2011/8/22 14:12
No life (a.k.a. DattoMaster)
Joined: 2002/10/28
From: Melbored
Posts: 10702
 Re: Quad throttle manifold 9
Looks good! are you running a plenum
with a filter or sox?