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Old 08-04-2022, 12:16 PM   #1
Smokin19

 
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Porting blowers

Read this interesting article talking about porting blowers. Whether you agree or not it makes an interesting read. I came away with a question or two for those whizzes on physics and math.

If a blower can move more air after porting does the volume in increase in cfm or is it fixed at 1.7L? With both pulleys changed does the increased velocity equate to more volume?

My new fact I learned was the boost is actually left over air. So if after porting and no other changes the boost goes down. How did getting better flow with larger intake and headers out to 3" long pipes create my boost of >14.5 psi?

I am but a lifelong student of auto mechanics and still need to learn.

https://synergymotorsports.com/blogs...gers-and-boost
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Old 08-04-2022, 01:14 PM   #2
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After porting, your boost will go UP. The engine has not gained any efficiency, but the blower is moving more air, therefore boost goes up.

Now if you add headers, ported heads, a cam, etc them you’ve improved the efficiency of the engine and boost will go down. That’s not a bad thing, the engine is now moving more air, which means more power.

Oh, and the rotor pack volume is 1.7L on the OEM blower. Porting improves the ability of the blower to fill the rotors, that’s all.
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Old 08-04-2022, 01:51 PM   #3
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Quote:
Originally Posted by Joshinator99 View Post
After porting, your boost will go UP. The engine has not gained any efficiency, but the blower is moving more air, therefore boost goes up.

Now if you add headers, ported heads, a cam, etc them you’ve improved the efficiency of the engine and boost will go down. That’s not a bad thing, the engine is now moving more air, which means more power.

Oh, and the rotor pack volume is 1.7L on the OEM blower. Porting improves the ability of the blower to fill the rotors, that’s all.
What he said. ^^
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Old 08-04-2022, 04:04 PM   #4
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Quote:
Originally Posted by Smokin19 View Post
Read this interesting article talking about porting blowers. Whether you agree or not it makes an interesting read. I came away with a question or two for those whizzes on physics and math.

If a blower can move more air after porting does the volume in increase in cfm or is it fixed at 1.7L? With both pulleys changed does the increased velocity equate to more volume?

My new fact I learned was the boost is actually left over air. So if after porting and no other changes the boost goes down. How did getting better flow with larger intake and headers out to 3" long pipes create my boost of >14.5 psi?

I am but a lifelong student of auto mechanics and still need to learn.

https://synergymotorsports.com/blogs...gers-and-boost

Great read... thanks for sharing...
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Old 08-04-2022, 04:25 PM   #5
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Not only do you move more air you also generate less heat in the process that is if you keep the same pulley.
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Old 08-04-2022, 06:59 PM   #6
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Originally Posted by Dan82679 View Post
Not only do you move more air you also generate less heat in the process that is if you keep the same pulley.
Stock pulleys FTW.
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Old 08-04-2022, 07:30 PM   #7
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That's my plan. I want to port the stock blower and snout and eliminate TM in the stock tune. That's about it.
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Old 08-04-2022, 07:34 PM   #8
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Originally Posted by Blackdevil77 View Post
That's my plan. I want to port the stock blower and snout and eliminate TM in the stock tune. That's about it.
The only way to eliminate TM is in the TCM isn't it?
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Old 08-05-2022, 05:49 AM   #9
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Originally Posted by ZLRob View Post
The only way to eliminate TM is in the TCM isn't it?
Yes, unfortunately
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