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ezzzzzzz
Still Cruizin'
USA
3 Posts |
 Posted - 09/08/2008 : 08:27:12
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I'm fabbing a SC intake manifold for a Datsun L6. The SC is a M62. My design mounts the SC directly to the intake manifold (plenum with 6 runners to intake flange). The SC will be offset forward to line up the pulleys and belts. Here is where my question come into play. With the offset of the SC, the outlet is focused over the #1 and #2 runners. Should I build some baffling into the plenum to divert the SC charge away from these runners? I'm thinking they will possibly run lean due to the proximity of the SC outlet. A baffle would directly block the first two runners and would gradually taper down to a point ending up near dead center of the plenum. SC charge would hit this baffle and slowly blend it in the plenum to provide some kind of balance across all 6 runners as it flowed down and around the taper. I wish I could insert an image but there's no way to link back to my work account due to security restrictions. Let me try to explain better below;
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Imagine this is the opening , [00___], in the intake for the
SC outlet. The 0's are the #1 and 2 runners. The X's are the #3,4,5
and 6 runners inside the enclosed plenum. Now try to imagine a flat baffle that ressembles the tip of a pencil recessed into the opening so the 0's are not directly exposed. The taper of the baffle would run to the right stopping at or near the center two runners (X's). Compressed air would flow into the plenum, down the tapered baffle, flow progressively over the edges of the taper and charge the plenum more uniformly(?). Hopefully, this would provide better balance and equalized airflow into all 6 runners(?). Any observations or suggestions?
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CharlieB
Still Cruizin'
USA
2 Posts |
Posted - 04/21/2009 : 16:48:19
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I am assuming that you are planning on using a carb, thus the 'wet flow' characteristics of the air stream must be considered.
The fuel has inertia, simply diverting 2/3's of the airstream will help equalize the air flow but the inertia of the fuel may still cause leaning of cyl's 3 & 4.
Curved (?) 1/2 tube dividers would more favorably 'bend' air flow and tend to keep more fuel in suspension/atomized. Avoid Sharp corners, even with the turbulance, the inertia of the fuel causes inpact/wetting, and fuel accumulation.
If you could 'split the manifold so as to fabricate internal 'baffling' then marry the two planes of the manifold back together.
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CharlieB
Still Cruizin'
USA
2 Posts |
Posted - 04/21/2009 : 16:54:55
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My baffles were all displaced between my design and what appears in the actual posting.
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SC L6 intake design questions
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