NPP & burned valves???

Reply Subscribe

Thread Tools

Search this Thread

Jul 28, 2013 | 05:52 PM

olefam

Thread Starter

Pro

Joined: Oct 2003

Posts: 732

Likes: 2

From: Baxter MN

NPP & burned valves???

Hi,
Thinking about adding a switch so I can have my NPP exhaust baffles open when I want them open. This is on our 2013 Grand Sport, if it makes a difference. But wondering if there might be an issue with burned valves from too little backpressure? Anyone have any knowledge of this or experience one way or the other?
TIA
Glen

Jul 28, 2013 | 06:02 PM

Walt White Coupe

Race Director

Joined: Jun 2005

Posts: 10,909

Likes: 2,701

From: Phila Suburbs 2023 C8 & 2013 650ix

You can worry about something else because that is not an issue.

Jul 28, 2013 | 06:50 PM

Bill Dearborn

Tech Contributor

Joined: Oct 1999

Posts: 41,058

Likes: 9,820

From: Charlotte, NC (formerly Endicott, NY)

Quote:

Originally Posted by Walt White Coupe

You can worry about something else because that is not an issue.

Bill

Jul 28, 2013 | 07:07 PM

eboggs_jkvl

Moderator emeritus

Joined: Jun 2001

Posts: 18,599

Likes: 3,954

From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati

2015 C7 of the Year Finalist

Quote:

Originally Posted by Bill Dearborn

Bill

I'm with the guy!

Elmer

Jul 29, 2013 | 03:11 AM

REDC4CORVETTE

Safety Car

Joined: Apr 2004

Posts: 4,532

Likes: 7

From: Lahaina Hi

When the exaust is opened up it is to far to the back of the car to allow cold exaust into the head ,valve warpage or burning is not an issue.

Jul 29, 2013 | 02:00 PM

TLS_Addict

Team Owner

Joined: Oct 2007

Posts: 26,745

Likes: 694

From: PA

People run cut outs WELL before the flipper flappers and never an issue.

Jul 29, 2013 | 03:54 PM

Bill Curlee

Tech Contributor

Joined: Dec 1999

Posts: 32,910

Likes: 2,402

From: Anthony TX

CI 6,7,8,9,11 Vet

St. Jude Donor '08

The NPP flaps on my 11 Grand Sport have been open since the day I purchased the car OCT 2011.

Purchased the kit to open and shut them. They are always open!

NO ISSUES!

Bill

Jul 29, 2013 | 05:04 PM

AIR_RAM

Burning Brakes

Joined: Dec 2011

Posts: 876

Likes: 116

From: HOMESTEAD FL

Quote:

Originally Posted by Bill Curlee

The NPP flaps on my 11 Grand Sport have been open since the day I purchased the car OCT 2011.

Purchased the kit to open and shut them. They are always open!

NO ISSUES!

Bill

Same here... I just removed the fuse... but have run it more often with them open than not. The only time I MAY close it is when taking a long road trip with the better half... she does not like it as much as I do.

Just pull the fuse and enjoy!

SPEED SAFE, AIR RAM

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

10 Ugly Corvettes That We Still Kinda Love

Joe Kucinski

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

Brett Foote

10 Things Every Corvette Owner Needs (2026 Edition)

Michael S. Palmer

8 Most "Only Corvette Owners Understand" Quirks and Problems

Pouria Savadkouei

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Joe Kucinski

How Much Horsepower Every Corvette Engine "LOST" in 1972

Joe Kucinski

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Michael S. Palmer

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Joe Kucinski

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Joe Kucinski

8 Coolest Corvette Pace Cars (and Replicas) of All Time

Verdad Gallardo

Jul 29, 2013 | 06:59 PM

haljensen

Race Director

Joined: Mar 2005

Posts: 10,399

Likes: 26

From: Austin Texas

Backpressure isn't the problem, temperature shock is. Run without exhaust manifolds or headers where 60° air can hit 2,000° valves and you'll have a problem.