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Predator flow numbers

W

Westy

New member
Hi, new to the forum, and to karting.
I am looking for some flow numbers for the Predator 212 head and other parts.
Stock and ported if available.
Thanks
 
Thanks for the info.
I ordered a flow bench kit with cylinder bore adapter and velocity probe. It looks like I will be able to use a shop vacuum to power my flow bench. I can't wait for it all to arrive.
 
I just got the Performance Trends EZ Flow bench and I'm using a Fein Turbo vac. The Fein vac is pretty much a very high quality Shop Vac. I would think they will perform relatively the same. At 100 cfm actual test pressure is 16", which gets corrected in the software to whatever test pressure you choose. I sort of doubt one shop vac will flow anywhere close to 145 cfm @ 28". Like mentioned above you'll most likely need at least 2 to get that kind of flow. I could be wrong, but flow is flow no matter what bench you have.
 
No that's a highly modified Hemi head. A stock Hemi head flows around 52 cfm on my bench. Here's the head I posted the flow numbers of....
 
BradH -That's a very nice looking welded up chamber, do you know what the combustion chamber volume is in cc? How small a chamber have you been able to achieve?
 
That one was 18 cc. I have done some below 15 but they start to crowd the valves quite a bit and require the 28.5/25 valves. And maybe a little milling too��
 
Young, at what test pressure/depression are you using?

I use a single motor for mine. I'll have to look but pretty sure mine will get up to 145 at 28". I bought the motor/fan separate from an online vac parts/repair shop. It was about $100 just for the blower/vac motor.
 
I use a large shop vac.. I would have to look and see what its actually pulling at max flow... I do know I used a smaller vacuum that wouldn't pull as much.. but the meter showed the same flow numbers..
 
Got my flow bench kit yesterday. Here are some numbers from a stock non-hemi 212 head intake port.

FP1 v4.9.6490 (C)2014
Flow Performance LLC
PS1=40 PS2=40
Pitot Mode
DAD 0.0747
.039 .022 0.0
z
;Edit
Predator 212cc non-hemi cylinder head
Stock head, valves.
Cylinder bore adapter 2.755 ID x 2.2" length
Clay radius on inlet port ~1/2" radius
;
Mode 1
New value: 2
z
28.0 19.4 19.3
28.0 19.4 19.4 < Mark 0.05

28.0 36.1 36.0
28.0 36.1 36.1
28.0 36.2 36.1 < Mark 0.10

28.0 48.9 48.8
28.0 48.6 48.5 < Mark 0.15

28.0 51.9 51.8
28.0 51.9 51.8 < Mark 0.20
z
28.0 53.2 53.1
28.0 53.0 53.0 < Mark 0.25

28.0 54.0 53.9
28.0 54.1 54.0
28.0 54.0 53.9 < Mark 0.30

Looking forward to seeing how much I can improve those with a dremel.
 
After a little work with a Dremel tool I was able to get 66 CFM, up from a stock 54 CFM at .3" lift., 28"H20. About a 22% increase.
I was hoping to get 70 CFM. I just worked the short side radius and the bowl area without touching the actual port walls.
This was a stock non-hemi 212 head intake port and valve.
 
Yep , Rounding That "short side radius" is worth a lot . Now is that a 27mm or 25mm intake valve ? The non hemi Preds come both ways ..
 
sneaks12303 said:
Yep , Rounding That "short side radius" is worth a lot . Now is that a 27mm or 25mm intake valve ? The non hemi Preds come both ways ..
Click to expand...

The valve is 27mm. I did some more work on the short side radius and lost about 3 cfm. I had lowered the port floor as it approaches the radius.
 
When you remove material from the floor as it approaches the seat it needs to be minimal. The problem with the predator and clone head is that the air cannot be turned toward the valve. You can often pick up flow and lose power by doing this This is why the animal makes allot more power. Some will argue this but its just the way it is. Flowing air on the to the valve at an angle is a hp killer. A good animal motor will pull 9500 easily.
 
Westy said:
The valve is 27mm. I did some more work on the short side radius and lost about 3 cfm. I had lowered the port floor as it approaches the radius.
Click to expand...

One thing you don't want to do is lower the floor. By lowering the floor you take some of the short side radius away and the air has no chance of making the turn then. On the next head I do I'm going to raise the roof as much as I can and fill the floor to give it a straighter shot at the back of the valve.
 
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