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Re: plenum volume
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Not sure if this is the right form, but it has to do with my crossfire =
injected project. It seems that a better(more even) distribution and =
better flow would result from moving the top plate/swirl plates away =
from the manifold floor.
True
This would also change the plenum volume.
True
What part does plenum volume play in the over all scheme of intake =
design?
Lots, it basically controls what rpm the engine makes peak torque/HP. =
Also, makes up for flow limits in TB (to a minor degree).
How will increasing it effect performance, and is there a formula for =
figuring the correct volume for a certain engine combination?
Varies alot. Anything from one cylinders volume, to 1.5+x the =
engine's CID.
I would like to base the changes on something other than physical =
restraints(hood clearance etc.), without having to try a bunch of =
different combos with all the tuning and testing etc involved.
I have sone extensive porting mods to the cross fire manifold. Making =
a 1/4" thick spacer for the lid made a large difference (BTW, I'm =
running a 355 CID). Much better high rpm breathing.
Also, ground out the ERG tunnel. Opened up the outside pockets, and =
cut port roofs back 1/8" also. With enough cam 2" butterflies also =
help.
BTW run it with a 1227747. I some wotk but with the info from =
programming 101 makes it real sweet.
Grumpy
Kevin R
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<DIV><FONT size=3D2>Not sure if this is the right form, but it has to =
do with my=20
crossfire injected project. It seems that a better(more even) =
distribution and=20
better flow would result from moving the top plate/swirl plates =
away from=20
the manifold floor.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>True</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> This would also change the plenum =
volume.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>True</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> What part does plenum volume play in the =
over all=20
scheme of intake design?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Lots, it basically controls what rpm the engine =
makes peak=20
torque/HP. Also, makes up for flow limits in TB (to a minor=20
degree).</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> How will increasing it effect performance, =
and is=20
there a formula for figuring the correct volume for a certain engine=20
combination?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Varies alot. Anything from one cylinders =
volume, to=20
1.5+x the engine's CID.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> I would like to base the changes on =
something other=20
than physical restraints(hood clearance etc.), without having to try a =
bunch=20
of different combos with all the tuning and testing etc =
involved.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I have sone extensive porting mods to the cross =
fire=20
manifold. Making a 1/4" thick spacer for the lid made a large =
difference=20
(BTW, I'm running a 355 CID). Much better high rpm=20
breathing.</FONT></DIV>
<DIV><FONT size=3D2>Also, ground out the ERG tunnel. Opened up =
the outside=20
pockets, and cut port roofs back 1/8" also. With enough =
cam 2"=20
butterflies also help.</FONT></DIV>
<DIV><FONT size=3D2> BTW run it with a 1227747. I =
some wotk=20
but with the info from programming 101 makes it real =
sweet.</FONT></DIV>
<DIV><FONT size=3D2>Grumpy</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Kevin R</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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