AAN Inlet Manifold on 3b

[Doug_RS2]

Looks awesome

I wish I could weld like that - did you weld it yourself?

[Mark Halligan]

Looks the Dogs Martin six hours LOL oh to have the proper tools

I sent you Dougs FPR the other day can you let me know when/if you get it OK.

Cheers,

Mark.

[martinjs]

Looks awesome

I wish I could weld like that - did you weld it yourself?

well i had a go, but needless to say the angle grinder had to come out to get rid of my attempt lmao

[martinjs]

I sent you Dougs FPR the other day can you let me know when/if you get it OK.

Cheers,

Mark.

Will do mark, thanks a lot.

martin

[4WheelDrifter]

[Greg_S]

Looks spot on, fancy doing one for me......?

Might be worth tapering the end on the 5th cylinder where you have re done the end to get the right flow the cylinder no 5.

Greg

[martinjs]

Might be worth tapering the end on the 5th cylinder where you have re done the end to get the right flow the cylinder no 5.

Greg

?? do you mean no1 cylinder greg, at the front?

marco, what do you think?? will i have any problems as it is at the moment.

[Mark Halligan]

Might be worth tapering the end on the 5th cylinder where you have re done the end to get the right flow the cylinder no 5.

Greg

If you look at this photo the manifold does actually taper at the entrance to the runner to number five cylinder

[rotoryboy]

Hmmmmmmmmm, inlet manifold (in homer's voice,lol)

[Greg_S]

Doh, didnt scroll across on the screen. No need to do anything then.

Bit of a simpsons theme coming thru tonight, just been watchin the thing on C4 about them.

Greg

[Pisobiker]

Martin, the job looks absolutely gorgeous. Wish I had the machinery you used and the welding skills for making such good looking welds....

Apart from the look, of course the manifold NEEDS to work fine, but there is no way we can tell for sure until testing it.
The theory says for flow, while running from an end to the other of a tubing, actual section decreases partially 'cause of the "limit stratus" of fluid sticking on the walls and partially for all the drag and aerodynamical losse it might find on its way. This causes the speed to increase, therefore decreasing the boost (total energy MUST stay the same. Bernoulli "dixit"). To overcome this problem the tubing should smoothly increase the section accordingly. But on the plenum, each time flow meets a runner, is just like you're adding a flow section to the tube, therefore needing to taper.
Problem is while speed of flow and boost increase, frictional losses increase (actually with the square of the speed) therefore messing a lot calculations up. Only a very sophisticated matematical model can calculate the dimensions with good approximation.

Other possibility is you check what happens on each cylinder while running:

You put an EGT on each ex-runner and a boost meter (with peak function or with a one way valve on the line) on the in-runner.

I know this sounds a little complicated, but I can see no other way to be 100% sure.


Marco

[91_S2]

Beautiful work Martin.

A simple way to test flows is to use a flow bench. With all the gear you seem to have access to, I am sure you must have one sitting in a corner somewhere. Check behind the cyclotron or the sweep electron microscope

[Pisobiker]

Hi Rich,

well the flow banch would be nice, of course, but alone doesn't tell if a cylinder will work leaner or richer:

Quantity of charge (therefore volumetric efficiency) is also affected by the exhaust design, so you might have bench-tested and perfetly balanced the IM, but if one or more of the exhaust runners flow better/worst than others this will affect VE of that particular cylinder therefore causing lean/rich mixtures on it. Only monitoring the EGTs will make sure all 5 of the cylinders run whitin safe thermal and fuelling limits.

This of course means anytime you change EM layout things should be optimized again....
Of course if the 101% potential has to be found.


Marco

[audiman]

Good welding, i might invest in a TIG welder as they can do anything from Ali,SS,mild steel.

[martinjs]

Thanks for the comments, i think i'll leave it as it is and see what happens.
Just got the water manifold to sort out plus PS pump bracket to do, and numerous other things no doubt.