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 8604 Posts Member #: 573 Formerly Axel Podland |
28th Feb, 2011 at 02:35:32pm
Following on from yesterdays discussion about the use of dual cone inlets, I've attempted to simulate the effects.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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1267 Posts Member #: 831 Post Whore Montreal, Canada |
28th Feb, 2011 at 02:53:24pm
What I was also wondering about this type of inlet was the effect on the laminar flow. The fact that Calver mentions having to lean out the fueling would seem to indicate that there is more air speed over the carb jet.
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8604 Posts Member #: 573 Formerly Axel Podland |
28th Feb, 2011 at 03:07:07pm
On 28th Feb, 2011 jbelanger said:
What I was also wondering about this type of inlet was the effect on the laminar flow. The fact that Calver mentions having to lean out the fueling would seem to indicate that there is more air speed over the carb jet. I would expect it to alter the velocity profile across the port with a higher peak in the centre. Given that the MED setup places the inner cone very close to the auxilliary venturi, then I would expect that the higher velocity cause higher fuel flow, hence the need to lean it off a bit. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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1267 Posts Member #: 831 Post Whore Montreal, Canada |
28th Feb, 2011 at 03:13:36pm
So would that have an effect on VE which your model would not take into account?
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8604 Posts Member #: 573 Formerly Axel Podland |
28th Feb, 2011 at 03:33:35pm
On 28th Feb, 2011 jbelanger said:
So would that have an effect on VE which your model would not take into account? It may well improve the VE and the model would not identify it because of the method that I've had to use to simulate the cones. Interestingly, the natural frequency of the dual cone should be higher than a single inlet, but it has lowered the frequency at the valve 
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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8604 Posts Member #: 573 Formerly Axel Podland |
28th Feb, 2011 at 05:26:30pm
I've just ran the same simulations with a plenum, first with 100mm runners, then 250mm and in both case I've lost power/VE.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
28th Feb, 2011 at 06:01:33pm
Bah! this was getting intreguing too. On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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 4633 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
28th Feb, 2011 at 06:45:22pm
I was getting the lathe ready to make a set up to ...... |
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8604 Posts Member #: 573 Formerly Axel Podland |
28th Feb, 2011 at 07:02:30pm
Well, thinking about it, the plenum must be cancelling out the advantage. Therefore, if we make the plenum bigger the improvement may come back.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
28th Feb, 2011 at 07:31:10pm
Mine is about 2.2 litres, On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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4633 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
28th Feb, 2011 at 08:12:34pm
Mines the size of an oil tanker ! Lol |
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 8215 Posts Member #: 90 Post Whore Somewhere around Swindon |
28th Feb, 2011 at 09:59:57pm
Paul have you done a simulation on a standard inlet and plenum on a 1275 turbo? Crystal Sound Audio said:
Why wolfie...you should have your name as Fuckfaceshithead ! "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."-Douglas Adams |
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8604 Posts Member #: 573 Formerly Axel Podland |
1st Mar, 2011 at 08:50:36am
On 28th Feb, 2011 wolfie said:
Paul have you done a simulation on a standard inlet and plenum on a 1275 turbo? No, although I baselined the software on a number of known NA builds, then the 998Ti and got very accurate results. Why do you ask? Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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8604 Posts Member #: 573 Formerly Axel Podland |
1st Mar, 2011 at 10:32:06am
I've just modelled it with 100mm runners, dual inlets and a 2.5 litre plenum and it is no better.
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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8215 Posts Member #: 90 Post Whore Somewhere around Swindon |
1st Mar, 2011 at 11:46:10am
Just wondered how the results from the simulation came out Crystal Sound Audio said:
Why wolfie...you should have your name as Fuckfaceshithead ! "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."-Douglas Adams |
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