Re: How to fix this intake?
[Re: feets]
#3094297
11/15/22 09:58 AM
11/15/22 09:58 AM
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Joined: Jan 2003
Posts: 4,045 Shelby Twp. Mi
HardcoreB
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,045
Shelby Twp. Mi
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When I look at that gaping maw of a plenum with stubby little runners I see a chaotic hurricane of fuel mist getting slapped around by induction and reversion pulses. At low rpm the fuel is likely puddling on the floor. At the hit the end cylinders are getting a big gulp of dry air and the centers aren't doing much better.
That thing needs air flow. Big air flow. Bigger than that. A 440 will need scary rpm to make it work and will struggle getting up to speed. Big inch engines (bigger than my 541) would likely do better with it but, again, you'll have to work to get into the usable rpm.
Just my amateur eye speaking.
I do like some of those runner mods. Not sure if you’ve read the entire thread but this isn’t exactly what the plenum will look like when done.
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Re: How to fix this intake?
[Re: HardcoreB]
#3095625
11/19/22 10:07 PM
11/19/22 10:07 PM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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Not sure if you’ve read the entire thread but this isn’t exactly what the plenum will look like when done.
I read it and I'm interested in the results. In some situations it seems like I can see the air movement. This is one of those things and I'd like to know if my feeble imagination is on track.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: How to fix this intake?
[Re: feets]
#3095798
11/20/22 03:01 PM
11/20/22 03:01 PM
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Joined: Sep 2003
Posts: 19,366 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,366
north of coder
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i wonder if one were to bolt the intake to a flow bench, tape some yarn to the plenum, and watch what happens. maybe blocking off the runners you don't want to see ? or is that a common practice these days ? i have no idea how anyone does this stuff these days, so just bear with an old guy's blabbering.............
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Re: How to fix this intake?
[Re: moparx]
#3095864
11/20/22 07:43 PM
11/20/22 07:43 PM
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Joined: Mar 2006
Posts: 9,827 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,827
MI, usa
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i wonder if one were to bolt the intake to a flow bench, tape some yarn to the plenum, and watch what happens. maybe blocking off the runners you don't want to see ? or is that a common practice these days ? i have no idea how anyone does this stuff these days, so just bear with an old guy's blabbering............. Flow is going from the carb pad to the head back and forth at a unbelievable rate. The yarn would flutter. Doug
Last edited by dvw; 11/20/22 07:43 PM.
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Re: How to fix this intake?
[Re: moparx]
#3095944
11/21/22 10:00 AM
11/21/22 10:00 AM
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Joined: Jan 2003
Posts: 2,296 NE Ohio
DoubleD
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,296
NE Ohio
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i wonder if one were to bolt the intake to a flow bench, tape some yarn to the plenum, and watch what happens. maybe blocking off the runners you don't want to see ? or is that a common practice these days ? i have no idea how anyone does this stuff these days, so just bear with an old guy's blabbering............. pretty hard to do - its all about how they act under actual operating condition - with the different pulses created by the intake valves opening - Kaase has built some box type intakes out of clear lexan for this purpose The mod-man intake was built as a universal design - its a clunky intake at best I have played with putting some brodix turtles in the base - seemed to help with bottom end on the street - I have not used one on a race motor
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Re: How to fix this intake?
[Re: dizuster]
#3096017
11/21/22 01:14 PM
11/21/22 01:14 PM
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Joined: Jan 2003
Posts: 2,296 NE Ohio
DoubleD
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,296
NE Ohio
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I guess I'lll see how this one works when it goes down the track in the spring. Lot of speculation until that happens.
HardcoreB followed some guidance on floor mods that others have tried successfully.
We also worked with Larry Meaux... and the runner length, plenum volume, taper, CSA, etc... is almost to a TEE what was recommended when he ran the pipemax calcs for me
Tried to make it is as well thought out as possible, it's certainly not just a shot in the dark.. It will be interesting to see how it works out - because much of your design could apply to the Indy Bathtub intake which is horrible for fuel puddling and turbulence - especially once you modify it and cut the runners back and put plates in like was done on Russ's intake
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Re: How to fix this intake?
[Re: B1duster]
#3098146
11/29/22 04:48 PM
11/29/22 04:48 PM
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Joined: Jan 2003
Posts: 6,136 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,136
Melbourne , Australia
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I had saved this blower/modman pic months ago I would be curious to see how those spacers helped or hindered that manifold.
Alan Jones
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