BVH flow bench findings...

[PeteG40]

all 1.3s are yeah

[G40 AD]

Cheers Pete - I have my shell sorted now so will be in need of your super supercharger services as soon as my 6n sells!
Me and Saf (grungeisdead) will bob over for some of your Supecharger expertise when you are free!

I was always under the impression a 1.0l had the same head as a 1.3l??? I have the G40 head already so I think I will just get the inlet flow improved and polished... would it be neive to think that if your were running enough boost that the standard port size of a G40 would be a more suitable size over the 1.0l???

After 4 days of driving my new shell as a 1.0l on a 4speed i'm ready to get the G engine in ASAP... planned to wait till April but that just simply is not happening unless I get my main G finished v soon!

cheers Ad

[Varnish]

Here are some of my findings on the superflow 110 at college.
I'd be interested to see how they compare with the numbers the OP has.

7mm stem, 74mm bore adaptor, 10"H₂O

Standard AAV
Lift"   Flow in CFM
0.05   12.7
0.1   27.54
0.15   39.2
0.2   46.6
0.25   55.07
0.3   58.25
0.35   61.42
0.4   62.48

Standard AAU
Lift"   Flow in CFM
0.05   11.2
0.1   23.9
0.15   32
0.2   41
0.25   46.2
0.3   47.5
0.35   48.1
0.4   48.3

AAU with 36mm Valve (+2mm oversize)
Lift"   Flow in CFM
0.05   13.5
0.1   29.2
0.15   37.4
0.2   47.5
0.25   51.9
0.3   52.8
0.35   54.6
0.4   55.2

AAU with some work done on the short side and bowl area.
Lift"   Flow in CFM
0.05   13.5
0.1   30.4
0.15   42.8
0.2   54.3
0.25   59.5
0.3   60.6
0.35   63.5
0.4   63.9

Ported AAV
Lift"   Flow in CFM
0.05   16.4
0.1   29
0.15   38
0.2   49.3
0.25   59.1
0.3   64.6
0.35   66.8
0.4   69

I managed to get 79.8 CFM (discharge coefficient of 0.90) out of this port by using plasticine to increase the radius on the short side. There isn't enough room to get a TIG torch in these ports, so welding the floor up isn't an option.
Maybe I could use a pencil torch, but I don't have one of those.

I was trying to recreate this shape in the AAU port.
With the 36mm valve in the AAU there is little flow around the back of the valve, as was clearly shown by using a flow wand.
Unfortunately I found that the casting around the back of the valve (on the long side) is thin and I was into the water jacket before I had the shape right.
Maybe I just have a thin casting, I don't know.

With a little port work the AAU flows better than the AAV at all the recorded lift points,

The velocity kicks ass as the port is that much smaller than the AAV.
If I could get the air to flow on all sides of the valve I know it'd be a really strong flowing head.

But the only option may be to fill the AAV with JB Weld or similar.