Inlet Manifolds!?
01-07-2004, 01:11 PM
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Inlet Manifolds!?
How do u work out how big they should b in respect to engine capacity!?
also what sort of thickness metal is best!?
also what sort of metal!? ally, stainless!?
also what sort of thickness metal is best!?
also what sort of metal!? ally, stainless!?
01-07-2004, 01:25 PM
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no mate no at all, too big and you gain lag, and will get a pressure drop.
there's always an optimum size
but then again its all based on engine spec etc etc
but there are general rules of thumb to follow
there's always an optimum size
but then again its all based on engine spec etc etc
but there are general rules of thumb to follow
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01-07-2004, 01:50 PM
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obviously if you've got bling manament, i.e T2, SESC, Autronic, etc You can have fuel trim, but obviously for optimum performance i would think you would exactly the same amout of fuel and air into each cylinder to create a indentical combustion.
01-07-2004, 02:51 PM
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Back in my Formula SAE days, I had a discussion with Paul Gentilozzi (yes, that PG) and he commented that a plenum should be 110% of the engine capacity in volume.
This generalization seemed to work really well on the cars that we build subsequent to the discussion with PG as we set new records for HP and Torque using M85 (basically methanol)
The manifold that I made was basically a flat floor with 4 holes in it for the individual runners to each cylinder. Pressed and welded into the holes were basically velocity stacks that were fairly short. The 'roof' of the plenum tapered down from the inlet end to the blocked off end.
Worked great and was not all the difficult to fab.
This generalization seemed to work really well on the cars that we build subsequent to the discussion with PG as we set new records for HP and Torque using M85 (basically methanol)
The manifold that I made was basically a flat floor with 4 holes in it for the individual runners to each cylinder. Pressed and welded into the holes were basically velocity stacks that were fairly short. The 'roof' of the plenum tapered down from the inlet end to the blocked off end.
Worked great and was not all the difficult to fab.
01-07-2004, 03:17 PM
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Originally Posted by B19-TRB
nah not even the other MMS members can understand me! 
can someone be my translator whilst i am staying with lewis?
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