Cylinder Head Intake Runner Dimpling - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

olblue75 · 01-06-2020, 08:48 AM

Just watched the below video and first time I’ve heard of dimpling the the intake runner like a golf ball, said Dyno proven results. So scroll towards the end and you’ll see it.

https://youtu.be/X7NbAU9OSag

Russell James · 01-06-2020, 01:16 PM

Just my opinion, mostly myth and theory. What really works is what the pro race engine builders do everyday. You can look at what shops like Frankenstein or Reher Morrison or Musi or ECR or gazillion others on how they finish their ports... I can't think of a single one I've seen make their ports look like a golf ball. Most common is just a slightly rough burr bit finish.

David Reher from Reher Morrison is one the brightest racing engine minds out there. If you really want to see speed secrets, he spells out his list of important things in a cylinder head port here. And I don't see dimpling.

https://rehermorrison.com/product/bu...tips-and-info/

Great reading for anyone getting into engine building his 1-100 tips. And their paper copy engine building book is worth it's weight in gold.
http://rehermorrison.com/category/tech-talk/

On intake port wall finish, the goal of the finish is to avoid atomized fuel sticking to the walls as liquid (falling out of atomization). The traditional burr bit finish does that just fine. Concentrate on the proper port shape, and don't go mirror polishing it. Spend time on that long list of other more important stuff Reher listed out.

And if your fuel is having a falling out of atomization problem... some other big problem is going on. Junk... fuel, injector, carb... If someone did happen to mirror polish an intake port and was using junk fuel with a junk injector/carburetor... I bet dimpling the ports would help. But as a bandaid.

hammdo · 01-07-2020, 12:11 AM

I had those from GPI with my heads. They stopped doing that — didn’t see a big difference...

Not sure if the intake would be much better...

-Don

Bo White · 01-07-2020, 02:45 AM

Meh

Clarkstar · 01-07-2020, 09:14 AM

If it worked the best in the industry would be doing it already....

lazerlemonta · 01-07-2020, 09:42 AM

FOUR!!! look out here comes some "balls" from my dimpled heads lol id rather see 60 grit scratches or cnc marks to atomize the fuel. lots of vodoo in head porting. You can screw one up in a minute

Russell James · 01-07-2020, 10:55 AM

http://speed.academy/10-myths-of-cylinder-head-porting/
#2 for the dimpling mumbo jumbo
#5 and #6 for the world's smoking hottest cylinder port Goddess

zz430camaro · 01-07-2020, 11:29 AM

I talked to a guy who has a program that can do that to the heads. He said it's mostly for show, it does nothing to help flow, it just looks cool.

Bo White · 01-07-2020, 04:36 PM

Id be afraid of lifting a head with dimpled ports......

Greenhornet2 · 01-08-2020, 01:07 PM

I didn't watch the video no time at the moment but the only dimpling I have even done is on a chevy 350 intake and block on the ends where you run a bead of RTV this DOES help make a good seal and gives RTV extra grip

01-06-2020, 08:48 AM	#1
olblue75 Drives: 2010 2SS/RS Join Date: Dec 2009 Location: Clarksville Tennesse. Posts: 6,062	Cylinder Head Intake Runner Dimpling Just watched the below video and first time I’ve heard of dimpling the the intake runner like a golf ball, said Dyno proven results. So scroll towards the end and you’ll see it. https://youtu.be/X7NbAU9OSag __________________ Orange Krush II 1LE Front sway bar, Splitter, shocks and struts, Z28 dual mode mufflers, Intake, UCA Bushings, and Toresen 3.91 Diff. 1 piece DSS Drive Shaft, ZL1/C7 Calipers, and 32mm JPSS Rear Bar. ASC race spec splitter and wicker. 6th Gen M017 Wheels. Stainless Works 1 7/8 LTs. DSE and PAFDT Suspension components.

01-07-2020, 12:11 AM	#3
hammdo 'It's an experiment' Drives: [COTW 2/09/15] '11 GPI LSA SC Z/LE Join Date: May 2014 Location: Dallas TX Posts: 8,693 View My Garage	I had those from GPI with my heads. They stopped doing that — didn’t see a big difference... Not sure if the intake would be much better... -Don __________________ 747 RWHP 794 RWTQ "Horsepower sells cars, torque wins races." - Enzo Ferrari See My Build: http://www.camaro5.com/forums/showthread.php?t=385577

01-07-2020, 11:29 AM	#8
zz430camaro Drives: 2015 1LE Join Date: Oct 2015 Location: Cleveland, OH Posts: 1,485	I talked to a guy who has a program that can do that to the heads. He said it's mostly for show, it does nothing to help flow, it just looks cool. __________________ 2015 1LE, TSP 225/236 113+3, VMAX Throttle Body, CAI with race scoop, GPI Ported Intake, Land Speed Stage 2 Heads, 1-7/8 headers, NPP exhaust, 25% Fluidampr, LT1-S Monster Clutch, 485 RWHP & 444 TQ

01-08-2020, 01:07 PM	#10
Greenhornet2 Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019 Location: Connecticut Posts: 1,925	I didn't watch the video no time at the moment but the only dimpling I have even done is on a chevy 350 intake and block on the ends where you run a bead of RTV this DOES help make a good seal and gives RTV extra grip __________________ Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane

01-06-2020, 01:16 PM	#2
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,483	Just my opinion, mostly myth and theory. What really works is what the pro race engine builders do everyday. You can look at what shops like Frankenstein or Reher Morrison or Musi or ECR or gazillion others on how they finish their ports... I can't think of a single one I've seen make their ports look like a golf ball. Most common is just a slightly rough burr bit finish. David Reher from Reher Morrison is one the brightest racing engine minds out there. If you really want to see speed secrets, he spells out his list of important things in a cylinder head port here. And I don't see dimpling. https://rehermorrison.com/product/bu...tips-and-info/ Great reading for anyone getting into engine building his 1-100 tips. And their paper copy engine building book is worth it's weight in gold. http://rehermorrison.com/category/tech-talk/ On intake port wall finish, the goal of the finish is to avoid atomized fuel sticking to the walls as liquid (falling out of atomization). The traditional burr bit finish does that just fine. Concentrate on the proper port shape, and don't go mirror polishing it. Spend time on that long list of other more important stuff Reher listed out. And if your fuel is having a falling out of atomization problem... some other big problem is going on. Junk... fuel, injector, carb... If someone did happen to mirror polish an intake port and was using junk fuel with a junk injector/carburetor... I bet dimpling the ports would help. But as a bandaid.

01-07-2020, 02:45 AM	#4
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,018	Meh

01-07-2020, 09:14 AM	#5
Clarkstar Drives: 2013 1SS 1LE Join Date: Jun 2016 Location: Ixonia wi Posts: 1,456	If it worked the best in the industry would be doing it already.... __________________ 2013 1le- Katech 416 short block, TSP custom grind cam, LOD intake, cnc heads by F.ED., Nick William's 102mm T.B., CORN fed, Pedders coilovers. Performance street alingnment by Justin at Lake Country Alignment and dyno tune by Late Model Throttle. 603 h.p. 495 ft lbs tq.

01-07-2020, 09:42 AM	#6
lazerlemonta Drives: 2010 C6 1LT Join Date: Dec 2011 Location: Virginia Posts: 879 View My Garage	FOUR!!! look out here comes some "balls" from my dimpled heads lol id rather see 60 grit scratches or cnc marks to atomize the fuel. lots of vodoo in head porting. You can screw one up in a minute __________________ 2010 C6 JET STREAM BLUE BOLT ONS TO THE EXTREME, GPI 281cc HEADS, Darth_V8r SPEC CAM, FAST 102 INTAKE, CRANK SCRAPER, QUARTER MASTER 7.25" CLUTCH, RPM 3.90 STAGE II DIF, Z51 Gear Set AND E85 Best ET 10.58 @ 131.8 stock heads and stock cam 453/445 SAE 10.62@134.82 GPI 281CC Heads, SS4 Cam and X1 Intake Best 1/8 6.80@105.75 Best MPH 134.82

01-07-2020, 10:55 AM	#7
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,483	http://speed.academy/10-myths-of-cylinder-head-porting/ #2 for the dimpling mumbo jumbo #5 and #6 for the world's smoking hottest cylinder port Goddess

01-07-2020, 04:36 PM	#9
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,018	Id be afraid of lifting a head with dimpled ports......