Afternoon...
Whilst this is actully distracting me from designing an inlet for a race engine, Id thought Id show you anyway.
This is an inlet manifold Ive been designing to fit a 1242cc 8v SPi Engine, it'll also fit the 1108cc SPi and with mods would fit the 8v MPi too
It looks a bit like this
Ive been running it through an analysis package to see what the flow is like...I can't do a dynamic engine cycle in this / I cba figuring it out as Ive got bigger fish to fry atm...so Ive done a series of static analyses on it taht approximate an 1-3-4-2 cycle.
On cylinder 1 inhalation:
On Cyl 1 and 3 overlap period:
Cylinder 3 Inhaling after Overlap Period:
Cylinders 3 and 4 during Overlap:
Cylinder 4 inhaling after overlap:
Cylinder 4 and 2 during Overlap:
Cylinder 2 inhaling after overlap:
As you can see, theres quite a lot of turbulence caused / pressure losses around the point the runners meet the main chamber. This is as the joint is 90-degree. it needs to be radiused ideally...Im gonna give that a go eventually.
But overall average pressure loss is around 0.003Bar...and theres some swirl in the runners (notice the flow is reasonably straight), but not too much (its not all over the place- like at the chamber-runner joint. So it should perform reasonably well...
Whilst this is actully distracting me from designing an inlet for a race engine, Id thought Id show you anyway.
This is an inlet manifold Ive been designing to fit a 1242cc 8v SPi Engine, it'll also fit the 1108cc SPi and with mods would fit the 8v MPi too
It looks a bit like this
Ive been running it through an analysis package to see what the flow is like...I can't do a dynamic engine cycle in this / I cba figuring it out as Ive got bigger fish to fry atm...so Ive done a series of static analyses on it taht approximate an 1-3-4-2 cycle.
On cylinder 1 inhalation:
On Cyl 1 and 3 overlap period:
Cylinder 3 Inhaling after Overlap Period:
Cylinders 3 and 4 during Overlap:
Cylinder 4 inhaling after overlap:
Cylinder 4 and 2 during Overlap:
Cylinder 2 inhaling after overlap:
As you can see, theres quite a lot of turbulence caused / pressure losses around the point the runners meet the main chamber. This is as the joint is 90-degree. it needs to be radiused ideally...Im gonna give that a go eventually.
But overall average pressure loss is around 0.003Bar...and theres some swirl in the runners (notice the flow is reasonably straight), but not too much (its not all over the place- like at the chamber-runner joint. So it should perform reasonably well...
