Porting blowers

Smokin19 · 08-04-2022, 12:16 PM

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

Joshinator99 · 08-04-2022, 01:14 PM

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.

ZLRob · 08-04-2022, 01:51 PM

Quote:

Originally Posted by Joshinator99

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. ^^

SOCAL.M6.ZLE · 08-04-2022, 04:04 PM

Quote:

Originally Posted by Smokin19

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...

Dan82679 · 08-04-2022, 04:25 PM

Not only do you move more air you also generate less heat in the process that is if you keep the same pulley.

CW3SF · 08-04-2022, 06:59 PM

Quote:

Originally Posted by Dan82679

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.

Blackdevil77 · 08-04-2022, 07:30 PM

That's my plan. I want to port the stock blower and snout and eliminate TM in the stock tune. That's about it.

ZLRob · 08-04-2022, 07:34 PM

Quote:

Originally Posted by Blackdevil77

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?

Blackdevil77 · 08-05-2022, 05:49 AM

Quote:

Originally Posted by ZLRob

The only way to eliminate TM is in the TCM isn't it?

Yes, unfortunately

08-04-2022, 12:16 PM	#1
Smokin19 Drives: 19' ZL1 A10, w/pdr Join Date: Sep 2014 Location: S.W. ohio Posts: 1,406	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 __________________ BTR Stg II cam w/ 38% fuel lobe, ARH 2" headers into 3" w/cats, AWE Touring, Kong X port, Weapon X triple ht exchangers, NW 103, Rotofab big gulp, DSX lowside, TCM tune, BMR Lockout, Mustang dyno 720 rwhp, 634 rwtq.

08-04-2022, 01:14 PM	#2
Joshinator99 Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: Petersham MA Posts: 3,390	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. __________________ 2017 Chevy Camaro 2SS A8 Kong ported Whipple 9.25/3.25, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, everything BMR makes, OEM 1LE wheels (street), Forgestar D5 bead locks (track). *955 WHP/842 WTQ, 9.65 best ET, 149 best MPH* 2021 Ford Expedition Limited 4WD (daily driver) 2018 Alfa Romeo Giulia Ti Sport Q4 (hers)

08-04-2022, 04:25 PM	#5
Dan82679 Drives: 2017 ZL1 Join Date: Jul 2019 Location: NJ Posts: 228 View My Garage	Not only do you move more air you also generate less heat in the process that is if you keep the same pulley.

08-04-2022, 07:30 PM	#7
Blackdevil77 Drives: 2008 Pontiac G8 GT, Shelby GT500 Join Date: Mar 2011 Location: Long Island, New York Posts: 1,376	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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