J666AYP
|
| posted on 26/4/18 at 08:57 PM |
|
|
Inlet manifold feedback...
Gents,
Just having a brainstorming session in the garage. Could this work? (excuse the lack of primarys its just a mock up and dont want to waste my time
welding it if its no good)
Jay
|
|
|
|
|
snapper
|
| posted on 26/4/18 at 09:12 PM |
|
|
There should be some sort of inlet trumpet in the box and the very narrow profile of the box at the far end is very restrictive.
You need more room between individual inlet hole and the face of the box.
There is a volume of air in the plenum that the negative pressure created by the piston descending draws on, because the induction is not linear you
don’t want the volume trying to move back and forwards up and down the plenum.
A bit difficult to describe but I hope you get the idea.
Basically the very narrow far end is not a good desighn
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
|
|
|
J666AYP
|
| posted on 26/4/18 at 09:37 PM |
|
|
Snapper,
I thought narrowing the back would speed up the airflow towards the rear end and ensure that the last cylinder would not be starved of air after the
other 3 have drawn air in?
I may have that completley wrong (the logic seemed so strong lol).
Back to the drawing board it is 
Cheers,
Jay
|
|
|
bi22le
|
| posted on 26/4/18 at 09:56 PM |
|
|
I am lucky enough to have access to CFD software and I can 3D CAD model quickly. Snapper is bang on. The first three will take all of the air.
Remember the engine is still sucking the air, even though it's under pressure.
I tried designing various home brew versions and then realised that actually the best designs are already out there.
Google to death after market turbo plenums for any make of car. If you can hit on Motorsport ones that's even better as they are normally
completely uncompromising.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
|
|
|
theduck
|
| posted on 26/4/18 at 10:10 PM |
|
|
quote:
Originally posted by J666AYP
Snapper,
I thought narrowing the back would speed up the airflow towards the rear end and ensure that the last cylinder would not be starved of air after the
other 3 have drawn air in?
I may have that completley wrong (the logic seemed so strong lol).
Back to the drawing board it is
Cheers,
Jay
That theory is correct, but I think the point is it narrows too much
|
|
|
J666AYP
|
| posted on 26/4/18 at 10:40 PM |
|
|
Oh well, win some lose some.
Cheers gents I will get back to the drawing board.
Jay
|
|
|
coyoteboy
|
| posted on 27/4/18 at 02:49 PM |
|
|
quote:
Originally posted by bi22le
Remember the engine is still sucking the air, even though it's under pressure.
Technically, the plenum air is pushing in on the lower pressure area generated by the opening of the valve on a lower pressure cyl, sucking is a
misnomer here - forced induction or natural, the process is the same, only the absolute pressure values change.
|
|
|
