Just go weld a tennis ball can to the factory runners and you have a new manifold.

 

Finally found pic of almoust finished product. Its quite rare but far as i know it works

 

So this is a dual-plenum plenum?

 

Looks that way with a slot down the whole length. I guess in theory it would be like an air curtain flowing downwards more evenly than blowing past #1

 

Hmm. That's interesting.

 

Never seen that before... Thanks for sharing your find. Looks like it would take up quite a bit of space, but should distribute air more evenly across all cylinders.

 

That thing looks massive... But I like it! I really would like to change the stock manifold on my car eventually.

 

I know one miata running whit that kinda plenum. I told him to come and tell his opinion about it

 

That would be cool to have an opinion with real-world experience on that design instead of guessing how it works.

 

thats my inlet.. its the second one we build for the miata using that layout..
the design originates from grB rally etc.. very nice flow, very even distrubution of air.. and quite compact..


here's a pic of the setup with the old manifold.. same idea, just not as nice finish, and a smaller stock throttlebody instead of the 70mm ..






comparison of new/old




inside of the new manifold..





lenghts , volume etc etc, have been calculated for my setup, turbosize, cams +++ .. ive had help dooing this.. worked great on the last one.. should work this time too..

 

hf - Do you happen to have any more pics of your setup? I'm going to be converting to a bottom mount manifold similar to yours and trying to lay it all out in my head. I'm also running a T3/T4 with a Tial. A few pics would certainly help me. You can pm me if you would rather just send them to an email addy.

Looking damn good btw!

-Michael

 

Oh wow!!! Any additional pics of the new intake manifold? That is sex!!! Also, what did you use to calculate the needed volume and such? Thanks for joining in the discussion!

 

short speclist.. (added a few more pics in the previous post)

1883cc , miataroadster billet oilpump, fully balanced lower end, carrillo rods, wiseco pistons, fully ported++ head, maruha motors cams, HF design coolant reroute, homemade 321 ss exhaust manifold, 3" exhaust, gt3076r turbo, twin 25row oil coolers and the custom inlet..
all controlled by a autronic sm4 ecu, running chevy LS2 coils for spark. car is buildt as a trackday monster, but is still streetable, kinda..

lots and lots of other mods on the car.







hope you guys like it

 

Do you happen to have more of the exhaust manifold side of things?

Thanks

Michael

 

Wow... freaking wow. That looks great!

 

Sorry for off topic, but where did you get that trunk lip spoiler??

 

Looks nice... Any additional pics of the intake mani? Also another off topic, what kinda power are you laying down with the GT3076R?

 

That is one NICE Miata.

If you care to stick around here the expertise put into your build would be appreciated.

 

very nice manifold, i like the design, my next one may be similar, your engine setup is not far off from mine, i think i have more head work, im running a gt3071r, integral cams R3 in and R1 ex,

 

NICE!! Along with everyone else I would love to hear as much as possible about your set-up!