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| Swirl direction??? https://www.ausmini.com/forums/viewtopic.php?f=5&t=96243 |
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| Author: | Besser [ Mon Oct 30, 2017 8:23 am ] |
| Post subject: | Swirl direction??? |
Supplemental to my injector question, however.... A: Which way CW/CCW does each cylinder swirl? B: At what RPM does the swirl become tumble? (allows me to multi injector fire) |
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| Author: | Kennomini [ Mon Oct 30, 2017 6:46 pm ] |
| Post subject: | Re: Swirl direction??? |
I don't know, but are we talking about swirls in the compression stroke? Dose the inlet manifolds affect any of this? Interesting topic I've never really got into. |
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| Author: | Besser [ Tue Oct 31, 2017 7:47 am ] |
| Post subject: | Re: Swirl direction??? |
It's on the inlet stroke. two valve heads generate a swirl where 4(+) valve heads tumble with efficiency cross over around 4000rpm (stroke/bore ratio dependant). Im assuming the swirl in the mini 5 port is both CCW/CW due to the Siamese ports with the direction correlating to the tangential momentum of air-fuel to the cylinder circumference. But that's only an assumption. If I can shoot the fuel from each injector to suit cylinder fill, I can smooth out the rich/lean bias. I'm also considering smaller injectors and concurrent firing at higher demand. If I can poke holes in my thoughts now it'll save some coin later. |
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| Author: | fuzzy-hair-man [ Tue Oct 31, 2017 6:05 pm ] |
| Post subject: | Re: Swirl direction??? |
I figure looking from the inlet port side from the top of the cylinder: 1 CW, 2 CCW 3 CW 4 CCW. But that's just a slightly educated guess that most of the charge goes in the backside of the valve and will turn around as it encounters the cylinder wall. I suppose an injector fired at the valve would have to help somewhat with charge robbing and maybe firing cylinders 1 and 4? slightly later. It was an idea I had some time ago, swap the exhaust and inlet ports, so you have 3 inlet ports an 2 exhaust ports, cylinders 2 and 3 then share the middle port but are separated so charge robbing would be minimal. The exhaust might not be optimal however... You would have a charge go out the port immediately followed by it's neighbour which might result in some scavenging happening? You would need a pretty different camshaft though. |
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| Author: | Besser [ Thu Nov 02, 2017 10:07 am ] |
| Post subject: | Re: Swirl direction??? |
Ok updated the cranium to one injector per cylinder (2 per port), dumped the concurrent firing. |
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