finishing custom intake manifold...need some advice...

[thomasK(austin)]

So i bought this almost done intake manifold for the RB25. what do you think i should do, re-fab the coolant inlet and put a TB plate on straight like it is now OR keep the location of the coolant inlet and get the TB off to the side more so it will all clear?

let me know what you guys think

Modified by thomasK(austin) at 9:14 PM 6/21/2006
Modified by thomasK(austin) at 9:15 PM 6/21/2006

[thomasK(austin)]

pics

[thomasK(austin)]

pic

[Imissmyturbo]

I have to say that the surge tank is too small for a 2.0-2.5L motor. The tank should be X (I wanna say 2.5 Times the engine size) amount that size of the motor. I read it in an artical about how to build intake manifolds. Without the proper size surge tank you will not get even air distribution.

[IowaRB240SX]

Agreed. You really wouldn't be gaining much there. Mine is goin to have a volume of 678 cubic Inches! For tose that want details, it will be 24" long and made of 6" ID aluminum pipe.

[ISL33P]

simply cut off the existing metal inlet and weld on a 90deg angle with a bit of straight pipe the same size. you then simply rotate the standard hose and it will line up with the bend/pipe. then simply cut the hose to the correct length to make it fit.

this is how i do all my rb20/25 intakes.

i will get you a photo of what i mean ASAP

[FAST-DATSUN]

For any kind of HP you need to get the flow checked; the size and lack of extra space on #6 looks like it will lean out badly, if its only for show who cares, but you do not want to keep killing #6 due to air flow problem..

[DETurbine]

That is one hacked up custom intake manifold...I like how the velocity stacks are flush with the plate but other then that I can point out tons of problems. The meterial is to thick which will add some weight and most importanatly...heat soak a little more then the thinner aluminum normally would, the runners to velocity stacks ID are different size, which will mess with the flow and the tank itself is to small. The welds itself look like complete ****...hopefully you didn't pay over $100 for that.

[ISL33P]

congrats on the effort.speaking from experience for the flow, you will find quite the opposite, as 6 will not flow enough air and therefore have a rich mixture

ps this is what i mean about the 90 deg turn...it still retains a standard hose, just cut and turned 90 deg on radiator to suit, its that simple