GoinManta· Opel Tinkerer and Rescuer
1996 Opel Calibra
Waiting on the man (Gil) to get the man (Bob) some 2.4L valves to do the flow test.I’m keeping my fingers crossed. I think it’s great that you are taking this on. Just curious Charles did your design(s) go through the RB flow test yet, if so how do they stack up? Or is my question still a little premature yet?
I have ZERO question as to how well it will flow well and also if it balanced.
So It will be does it flow as good as a side draft ? better than a 1.9L EFI ? better than a standard downdraft ? etc.. etc..
Where does it fit ?
Long story short..
- Plenum is Larger than stock 1.9L EFI by about 25% in volume
- Runners are shorter than the EFI intakes, and less restrictive
- The runners are longer and more balanced than the stock downflow intake
- The throttle body and opening is 60mm ventri with a slope to help tip in. But about a 20% increase in surface area
32+36 = 1820 sq mm
38+38 = 2168 sq mm
52 (EFI Stock) = 2123 sq mm
40+40 = 2512 sq mm
60 = 2827 sq mm
Now I hear you saying that could make the car touchy during tip in off of idle.. and you would be right EXCEPT..
The Throttle body I picked has this ramp at the base to only allow the top of the ventri to up from 0 to about 20% throttle.
The first 5% of throttle you have virtually only half the face of the ventri opening
This should help with the issue of the throttle being to big.. think of it like a 32/36 having a primary and a secondary.
I have a feeling this will flow as good as a single midi sidedraft intake and be possibly better balanced due to the plenum buffer
The real test will be when on a car and you can run the snorkel to the front of the car for a little naturally forced intake with no AFM in the way.