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Old 04-16-2013, 11:03 PM   #1
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Hair-brain idea, planning stage

*This has been shelved. Not dead but highly unlikely to work.*

So I've acquired a M112 off a Lightning.
I just want confirmation that I'm figuring the, rough, math correct:

The math isn't. I'll correct it once I get back home ...




- According to Eaton's explanation of how the blower is named, it's 112 Cubic Feet of air per revolution.
- That equates to 1728/112 to find Cubic Inches per revolution, ~15.429.

- To pressurize the intake you need over 100% Volumetric Efficiency, at least in the sense that the blower needs to input more air than the engine is able to use.
- Using strictly displacement of the zetec, 121/4, 30.25 CI.
- 30.25/15.429, ~1.96. This is how many rotations the blower must make to equal the volume of 1 cylinder.
- That means anything over that point will create pressure and we now have a minimum ratio to use for pulley diameters.

- Stock Crank Dampener is ~ 5.1875" in Diameter.
- 5.1875/1.96, 2.65" is the minimum diameter of a usable blower pulley.

- Engine RPM*1.96 equals blower speed
- 1,000*1.96, 1,960
- 2,000*1.96, 3,920
- 3,000*1.96, 5,880
...
- 7,000*1.96, 13,720, which is over the RPM limit of the blower per Eaton, 12,000 RPM.

- Let's say my max engine RPM is 8,000 and we're sticking with Eaton's 12,000 limit.
- 12,000/8,000, 1.5 is the optimal pulley ratio.
- 5.1875/1.5, 3.49" is our maximum blower pulley diameter.

- In a nutshell, the point at which 'boost' comes on is determined by the pulley ratio
- Maximum blower speed should not be exceeded

So if I still want to rev the snot out of my car I should look for a largish pulley for the blower. But I'm probably better off using less engine RPM and more blower speed earlier.



Just need you guys to double check my math/theory.
I know it sounds like it'd be way to damn big, but just ignore that and concentrate of facts/math.



Last edited by iminhell; 12-14-2013 at 07:31 PM.
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Old 04-16-2013, 11:25 PM   #2
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You lost me at "acquired a M112 off a Lightning" LOL

In theory sounds pretty good, wonder about the power curve, it's peak and rpm.
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Old 04-16-2013, 11:36 PM   #3
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That's what it's capable of flowing.
The truck it came from put down 499whp on my tune and E-85.
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Old 04-16-2013, 11:50 PM   #4
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I guess you're deadset on a custom made pulley? I did a brief look around and found 2.9"ish was the biggest I found off the shelf. What size pulley did your kit come with and would the car even drive with it?

I'm not a math guy but it 3/4s makes sense from what I could follow and I doubt you'd post if you weren't 98% sure so let's trust it.

Do you have the money and means to test a few different pulley sizes? My instinct would be to shy away a bit from your "optimal" 3.49" calculations just for margin of error and safety, I don't know what your compression ratio is but if I remember correctly you're doing around 180 WHP and that's pretty potent.

EDIT: I just browse active chat topics and visit what looks interesting, I don't claim to be a knowledgeable FI guy by posting hurrrrrr.
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Old 04-20-2013, 04:08 PM   #5
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Your math and theory looks good , Do you want my opinion ?

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Old 04-21-2013, 02:32 AM   #6
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You might want to check your math from the first line:
"According to Eaton's explanation of how the blower is named, it's 112 Cubic Feet of air per revolution.
- That equates to 1728/112 to find Cubic Inches per revolution, ~15.429."

112 ft^3 / rev *1728 ci / ft^3 = 193536 ci / rev

Check the units, they need to cancel. Obviously there is no way this blower displaces this volume.
I would bet it is 112 CI (cubic inches) per rev.
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Old 04-21-2013, 09:54 AM   #7
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Quote:
Originally Posted by 1turbofocus View Post
Your math and theory looks good , Do you want my opinion ?

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I'm always open, you know that.
(and yes I know I'm nuts and this may not pan out in the least)



Quote:
Originally Posted by paulg127 View Post
You might want to check your math from the first line:
"According to Eaton's explanation of how the blower is named, it's 112 Cubic Feet of air per revolution.
- That equates to 1728/112 to find Cubic Inches per revolution, ~15.429."

112 ft^3 / rev *1728 ci / ft^3 = 193536 ci / rev

Check the units, they need to cancel. Obviously there is no way this blower displaces this volume.
I would bet it is 112 CI (cubic inches) per rev.

I got that wrong. Eaton rates them in Cubic Inches, not feet.
I amended my initial post.

Last edited by iminhell; 04-21-2013 at 11:10 AM.
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Old 04-22-2013, 11:12 AM   #8
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I dont think your going to gain a lot , back in the early years I tuned a Focus with a large SC on it all custom made mated with a turbo as well , the SC just couldnt be turned enough so he made pulley to turn it more , it took so much TQ from the engine to turn it that all the HP it was making was taken away in turning the SC

People dont realize how much TQ/HP it takes to turn a SC , this is why jrsc chose such a small SC as well as pw

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Old 04-22-2013, 09:01 PM   #9
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I understand that. Anything belt driven is a balance between power to drive vs power gained.
I honestly think this blower is waaay too big. But for sake of going through and being thorough I'm just running the numbers.
I don't think I'll end up going through with it, but so long as I tell myself I am I'm saving money from being spent on something else. Who knows, maybe I will just say screw it and do a big shot of nitrous.
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Old 04-23-2013, 08:14 AM   #10
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if i were in your position i would just go with the nitrous. simpler, more power, and probably cheaper. that is unless you just want to be different. really cool idea either way
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