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Re: How to fix this intake? [Re: feets] #3094237
11/14/22 10:03 PM
11/14/22 10:03 PM
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MI, usa
dvw Offline
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I know of at least two N/SS racers running a far less modified version of the Mod Man that have both been in the 9.50's. I constantly hear how bad the 440-25 Indy cross ram is as well. Both work way better than many give them credit for.
Doug

Re: How to fix this intake? [Re: dvw] #3094296
11/15/22 09:54 AM
11/15/22 09:54 AM
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Shelby Twp. Mi
HardcoreB Offline OP
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As long as it goes 10.0s I’ll be happy!

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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Shelby Twp. Mi
HardcoreB Offline OP
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Originally Posted by feets
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.

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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Irving, TX
feets Offline
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Originally Posted by HardcoreB

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
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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north of coder
moparx Offline
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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 ? shruggy
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.............
beer

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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MI, usa
dvw Offline
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Originally Posted by moparx
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 ? shruggy
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.............
beer

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.
Re: How to fix this intake? [Re: dvw] #3095935
11/21/22 09:24 AM
11/21/22 09:24 AM
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Georgia
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Mine is modified. Sure, I wanted a quicker ET but that is not what started me down the path of modifying mine. I wanted to build a better mouse trap. The fuel stains from puddling told me, that I could build a more consistent combination. I spent three years in search of a way to make it better while slowing it down to run an index.When I ran restrictor plates, I found the car would pick up et at bizarre times. Definitely did not follow the log book and details.
Is mine quicker after the modifications? Yes. It wasn't the goal though.

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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NE Ohio
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Originally Posted by moparx
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 ? shruggy
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.............
beer


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

Re: How to fix this intake? [Re: DoubleD] #3095990
11/21/22 11:53 AM
11/21/22 11:53 AM
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Oakland, MI
D
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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..

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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NE Ohio
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Originally Posted by dizuster
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

Re: How to fix this intake? [Re: DoubleD] #3096068
11/21/22 03:24 PM
11/21/22 03:24 PM
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MI, usa
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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 [/quote]
Yup those Indy intakes don't work. Especialty unmodified like this one.
Doug

indy casey me.png
Re: How to fix this intake? [Re: dvw] #3096086
11/21/22 04:05 PM
11/21/22 04:05 PM
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NE Ohio
DoubleD Offline
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Doug

Did I ever say they don't work ?????????

Re: How to fix this intake? [Re: DoubleD] #3098073
11/29/22 01:01 PM
11/29/22 01:01 PM
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Shelby Twp. Mi
HardcoreB Offline OP
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Yeah I hope I'm not portraying that anything is bad so much as what i think can be done to improve. AND AGAIN not that any of this makes sense but when did I ever do anything rational to a bracket/index car? (Although as Brett has said and Ken @ Indy has also mentioned, in as-cast form it has distribution issues.) But again I'm not willing to A-B-A to compare it to a stocker because it isnt mine and I'm sure it's better! lol The Universe has had other plans for me still but i did manage to mangle it more together and added a pic of basically the way it's planned to look AGAIN WITH SOME other things not shown. basically I'd go to press with epoxy in it as pic'd here. Doug has proven the Indy bathtub works in stock form no doubt. Many of us do feel it can be improved and not necessarily in the few different ways i have seen. I'll also say I feel confident a SM 2x4 intake on Doug's motor will make more power and go faster but, is that saying anything?

tac4filled.jpg
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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Melbourne , Australia
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Originally Posted by B1duster
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
Re: How to fix this intake? [Re: LA360] #3103947
12/20/22 02:12 PM
12/20/22 02:12 PM
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Shelby Twp. Mi
HardcoreB Offline OP
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At least the outside might look decent?

SeanManDone2.jpg
Re: How to fix this intake? [Re: HardcoreB] #3132945
03/28/23 10:12 AM
03/28/23 10:12 AM
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Going to press with this...

LongSM.jpgSMplen2.jpg
Re: How to fix this intake? [Re: HardcoreB] #3133305
03/29/23 01:49 PM
03/29/23 01:49 PM
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north of coder
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that is quality work proudly displayed ! up bow
beer

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