[Jokerz]

Blower porting adds heat because you are getting more air into the blower, which results in an increase in boost, which results in more heat.

It's more efficient, but still increases the heat as you can't get around physics.

You will still increase power.

The blower will be more efficient than one not ported, so it's still a worthy upgrade.

I just feel the need to point it out as I'm an engineer, and I personally would want to know all aspects.



CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

When you do Efficiency mod with supercharger porting temps go down or remain neutral. On every before and after I have done there was no increase in iat2. On old school blower temps actually drops 40-50 degrees and boost increases by 2-3 lbs.


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[Karch]

With all due respect, if you are compressing more air, you get more heat, no way around it. If you port the inlet side of the blower, nothing on the outlet side, you must have more heat generated because the vary act of compressing air adds heat.

PV=nRT

If you are seeing otherwise, it's that you are either making other changes, or something else has changed, or your equipment isn't accurate enough.

 

[Lt1z]

With all due respect, if you are compressing more air, you get more heat, no way around it. If you port the inlet side of the blower, nothing on the outlet side, you must have more heat generated because the vary act of compressing air adds heat.

PV=nRT

If you are seeing otherwise, it's that you are either making other changes, or something else has changed, or your equipment isn't accurate enough.

Don't be getting all scientific with gas laws up in here

 

[Jokerz]

With all due respect, if you are compressing more air, you get more heat, no way around it. If you port the inlet side of the blower, nothing on the outlet side, you must have more heat generated because the vary act of compressing air adds heat.

PV=nRT

If you are seeing otherwise, it's that you are either making other changes, or something else has changed, or your equipment isn't accurate enough.

First of all Eaton blowers don't compress air though they are merely an air pump. Not a compressor. Whipple kennebell ihi are all types of compressers. Eatons are air pumps They merely speed up air and push into a cavity creating an atmosphere of pressure. When you port and eaton blower you lower the internal temps of the rotor pack housing where heat is generated. When in stock form the blower is efficient enough but when pulleys are added rpm is increased and internal pressures of the rotor pack area are increased. Pressure rises heat goes up. By porting and Introducing air to the inlet side more supplied air through the rotors helps to cool the outlet temp discharge. By lowering the internal pressure of the case you lower the iat2 or remain neutral. OBecause you increase efficiency you balance out the air temps. On old blowers you port the blower outlets to drop the case pressure even farther. This allows a temp drop internally. Allows you to run more pulley and control the iat2.




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[Karch]

Sorry, I believe you are not correct here.

I understand the blower doesn't compress the air internally, but it does so externally, by moving the air into a fixed space, where the air cannot be ingested fast enough, pressure rises.

The air isn't in contact with the rotors long enough to increase the air temp that much, it's the compression that does it.

To believe otherwise is wrong, or misleading.


CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

 

[subaru335i]

lol @ a supercharger not being a compressor "They merely speed up air and push into a cavity creating an atmosphere of pressure." Aka the compress air...like a compressor.

I can't comment on your hand porting but here and other threads you definitely don't seem to know what you are talking about on the technical side.
Simple trial and error can certainly get results but if you don't really understand what is going on you can easily misattribute gains to either a mistake in your testing or something unaccounted for because you are fumbling in the dark.

 

[Jokerz]

Since the boost gauge rises when using a roots Blower,
it is in fact compressing the air, albeit very inefficiently

The result of the blower pushing the air into an area by superchargers definition is not a compressor. The blower itself does not compress the air at all. A whipple/kennebell compresses the air internally. By internally I mean inside the rotor pack area.

 

[Jokerz]

lol @ a supercharger not being a compressor "They merely speed up air and push into a cavity creating an atmosphere of pressure." Aka the compress air...like a compressor.

I can't comment on your hand porting but here and other threads you definitely don't seem to know what you are talking about on the technical side.
Simple trial and error can certainly get results but if you don't really understand what is going on you can easily misattribute gains to either a mistake in your testing or something unaccounted for because you are fumbling in the dark.

Actually I am correct. The roots blower does not compress air.

https://www.enginebasics.com/Advanced Engine Tuning/Forced Induction Pg7.html

http://kennebell.net/KBWebsite/Common/pdfs/twinscrew-vs-roots-fromcatalog.pdf

Good read

And for the last time a roots blower does not compress air period. Sorry

The internal temperatures of a rotor pack area can get extremely hot when spun past its normal designed intent. By porting on either side you can help lower or balance these temps which reflect the temps.

If you take 2 lb increase from porting and put it against 2 lb increase from pulley the iat2 will be substantially higher with the 2 lb increased from being pullied. But by these statements it should be equal. I promise you it will not. This is statement changes from platform to platform. When you port a lightning blower and gain 2 lbs of boost temps actually drop 30-40 degrees because your dropping the internal temps of the case housing. On an lsa you gain 1-2 lbs and iat2 remain neutral. Which is from the porting getting air to the weakside and helping cool the rotors. When you add more blower rpm rotors start experiencing rotor starvation. Without the air the blower starts to heat up and tolerances disappear. When you port the blower and give the rotors more air to move the temperature will remain neutral or drop in temp and boost will go up not because of the temp increase but by you have giving the rotors more air to move.






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[Karch]

And why I mentioned the LSA blower doesn't compress the air internally, but does so externally. I tried to point that out, but he didn't catch it, read it, or something.

In the end, the LSA blower, when packaged with the intake and heads, does in fact increase mass air flow into the head. Pull the belt off, and that goes away, therefore the NET result is the blower is, IN EFFECT, compressing the air (again, external to the rotors, unlike a screw compressor).

 

[Bluebeare]

You would have to have data of a pullied up stock blower/snout on a 90+ TB/4"+ intake VS only change being ported blower/snout.

The power gains from snout/blower seem fairly low, and somewhat speculative. Maybe the temp increase is marginally low as well?

I do see Bretts point at allowing more air into the casing before it's inhaled by the rotors, possibly decreasing temperature as its more volume of air to distribute the heat that's soaked into the walls and rotors. It has access to more air now after porting, so the ratio of heat to accessible air, has now changed, thus lowering air temp into the rotors.

Also, the velocity has decreased in the housing, which also creates more heat. Always hearing about inflow restriction, which increases velocity and heat too!

 

[Jokerz]

Agreed to all comments. Yes I'm
Being way to literal but it's the business that makes my money. So I like to take it seriously probably to serious.


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[Jokerz]

So if you do agree to all comments;
What type of sauce do you prefer when your eating chunks of iron and aluminum?

Wd40


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[bmylez]

I was going to say duck sauce.

 

[_GTO_]

I don't know about what might happen with a ported blower but I'm sure with bigger intakes like the 5" I can see easily a 1-2 psi increase in boost and drop in IAT2 while IAT is the same .

So I'm with Brett at this one .

 

[adam112]

What does porting do to the pressure differential across the blower? Asking for actual data, not theory (theory tells me porting reduces vacuum at inlet assuming throttle body can flow enough for my stock heads and cam).

I'm currently seeing -0.8 psi gauge at inlet and 11.4 psi gauge max boost.

 

[09_v2_cadi]

Depends on supporting mods. On a great day porting the snout to 102mm and the blower case in conjunction with a 102mm tb and a good flowing motor (cam, exhaust,4.5 intake, and possibly headwork) I can see the 40hp. With just a stock ish setup maybe a 10 hp bump.

I feel like its so much just to get so little. Will it be worth the cost if im not doing a full out build? Lets say i just do snout and TB then cam?

 

[Karch]

Not worth doing the snout only unless you do the work. Figure 10 hp.


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[Rubber Duck]

Not worth doing the snout only unless you do the work. Figure 10 hp.


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-just for informational purposes-
The size of the TB 'Required' is dependent on several variables.
There has been much discussion on this topic over the years.

Once you have reached your 'Optimum' _Flow Area / _Size, there is little
value in going beyond / larger than that required area. . . _Circular Square Area!

Your better off being just a little on the 'Small Side' versus the 'Big Side'.

--------------------------------------------------------------------

I am still waiting (Yawn) for the 'Great One', Random 456789 / Jesse
to complete his testing.

Cheers

 

[TriTexan]

With all due respect, if you are compressing more air, you get more heat, no way around it. If you port the inlet side of the blower, nothing on the outlet side, you must have more heat generated because the vary act of compressing air adds heat.

PV=nRT

If you are seeing otherwise, it's that you are either making other changes, or something else has changed, or your equipment isn't accurate enough.

Don't be getting all scientific with gas laws up in here

EDIT: Almost forgot - Pervnert for the win!

-just for informational purposes-
The size of the TB 'Required' is dependent on several variables.
There has been much discussion on this topic over the years.

Once you have reached your 'Optimum' _Flow / Area / _Size, there is little
value in going beyond / larger than that required area. . . _Circular Square Area!

Your better off being just a little on the 'Small Side' versus the 'Big Side'.

--------------------------------------------------------------------

I am still waiting (Yawn) for the 'Great One', Random 456789 / Jesse
to complete his testing.

Cheers

I'll add to Duck's Sauce with a little anecdotal evidence from various sources on the forum here:

Some say Airaid and LS7 TB to about 675whp or so, above that go 102mm TB and 4.5 inch intake with appropriate filter size.

Others say Airaid and LS7 are good to 750whp or so.

I've tended to notice Duck tends towards a 102mm for larger builds. If the math is a bit intimidating (which it certainly can be), there ARE some basic rules of thumb you can go by. It's not rocket science....until it is.

 

[Karch]

The 90 can flow enough to support 750, but take that same setup, swap to a 4.5” quality intake and 102, and you should see gains.
These are on pump gas, not E85, as it takes more airflow to make these numbers on 91/93 than ethanol.


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