BAE manifold shoe

Well, I have been searching high and low for info on this, but none was found - So here goes.

Have anyone tinkered with the idea of a shoe in the front of the intake manifold to prevent air from getting caught in the burst plate pocket??
As far as I see it, it could be done with a curved plate deflecting air down and to the sides, but still making if possible for the pressure to get around to the burst plate in case of a BOOM.

Am I way of base here, or have I just not looked the right places??

 

You have touched on an area that I think could have a lot of improvement, for years I have been saying blower manifold are just an adapter from the heads to the blower, the problem is time and money for someone to really change the manifold plenum area, good luck I'n whatever you find, call me if you have any questions that might help you

 

Manifold shoes have been around for a long time and are still in use for a lot of Nitro motors that don't run a setback manifold --- you can buy one or have it installed in your manifold --- it requires a number of runs to get it right .

I just assumed the Alcohol motors used them ? What I want to know is do the screw blower setups use a higher pressure rated burst panel ?

 

Mark,

We utilize a dual-panel setup on the blower in the rear. It has 1 on the blower case, then an aluminum plate about .500(?) thick with another panel on that. So they are almost stacked, but with a spacer between them. It also has a hole in the spacer that we adapt a line to so we can blow into and check to see if the inner panel is all good. The intake manifold has the standard burst panel setup in front.

But no, as far as higher rated panels. Although, I wouldnt mind it. Finally turned our blower up a little more and now we are fracturing the inner panels. Not blowing them out, but just cracking them in the pre-formed crease. Pain in the ass to replace them on a door car!

Nice to meet you BTW. Been a long time coming. See you soon and thanks for the nice words when we spoke.

 

Thanks Jason, good to meet you -- I saw that "mister" on Marks car spraying at the end of a run --- so I am figuring that's a tattletale sign to change the inner ?

 

I was thinking about setting the blower back on the BAE std manifold (I do not think they make a set-back manifold for those heads?) with a plate and then make the shoe in front of the blower outlet.
Kind of making it horisontal at the top - flat on the setback plate - and then curve it down until it is vertical below the burst plate. Does that make any sense at all?

 

What I have in mind is some setback, and then putting in a curved plate to stop the flowing air from going into the burst plate pocket, but still allow it to burst the plate in case of a backfire.
The purpose of the shoe I am suggesting is not as much to redirect the air to the back, but simply to prevent the airflow from piling up in the burst plate pocket.

 

Maybe a bit too simple, but once you have pushed air into the burst panel pocket there is local high pressure there and this may just act as a natural deflector?
Setting up an additional deflector may just cause further separation of fuel and air disturbing matters rather than improving it.
If you want to control air flow exiting the blower you may want to consider guide vanes in the lower opening, but that probably requires setting the blower up much higher with a spacer to create enough space to make that work with some sort of efficiency. It probably also requires a degree in fluid dynamics so I wouldn't go there.

 

A problem with shoes, deflectors, and other devices is that they usually lead to more fuel seperation, which is going to cause more problems.

 

I have laid in bed at night thinking about this, wondering how to make it better,, I haven't had time or money to experiment with this but could you make a divider in the plenum some sort of modified dual plane to help the air return to the rear past the pie without running into it's self? is that how the shoe you are speaking about works?

 

high helix manifold shoes

We always ran one in our IHRA roots set up. works great with our Veney stuff. no more short rods in the front 4 cylinders. motor was much happier. we were 3inch wide 1.750 high sides 4 inch long and a 1 inch radius at the front. most of the boost comes out of the front 2 inches of the pie opening witch is why we made good gains opening up in front of the rotor more. then the later blowers came this way. we went right out and ran it all the way down the track. ended up taking some port nozzle away from the front and adding to the rear. works really well. Made the first one out off fabricated aluminum, they don't last! ended up using steel.

 

And TRUST ME!!! I had a "glimps" of their Intake once!! hahaha And they ran WELL in IHRA!!! You guys ROCK Mark!!

 

Interesting thread here..
Would be nice to see some photos of shoes

 

How far would I need to set the blower back, in order for all cylinders to be even?

 

It"s almost impossible to get the cilinders even with a standart manyfold due the pie shape of the outlet at a high-helix blower, we use a 10" setback with a standart manyfold and use on some cilinders different rocker arm ratios and dished valves.
I"m not a fan to put shorter rods in an engine, we run veney heads and these heads like to have the piston almost touching the chamber (we have tried with a shorter rod, but it makes less power)
you can get it almost even with a setback manyfold with long intake runners(like the veney setback manyfold) only bad thing is you loose a couple pounds of boost due the the large intake manyfold volume.