[DeTomaso] [EXTERNAL] Re: Exhaust popping

[Mirril McMullen]

Big Bores with tiny rust holes created the backfires in my car....

Now sporting R. McCall 180s and never going back....

Trunk space is over rated ;-)

/\/\

#6859 WAYBAC

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf Of Himes, Terry (US 397C) via DeTomaso
Sent: Sunday, April 5, 2020 1:51 PM
To: Mike Drew; fred
Cc: detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] [EXTERNAL] Re: Exhaust popping

HaHa...  ouch.  I've had Hall Big Bores since 2000.  ;-/



"A Purple Heart proves you were smart enough to hatch a plan,
 stupid enough to try it and lucky enough to survive!"
 
Terry W. Himes 
JPL Jet Propulsion Laboratory
Deep Space Exploration – Mission Operations
 
Dawn Spacecraft Team
Europa Lander Science Support Team
TGO Sequence Lead 
MEX Sequence Lead
Odyssey Sequence Team
Spitzer Space Telescope Data Team
 
Phone: (818) 393-6261
Cell:     (818) 653-8213
thimes at jpl.nasa.gov

 

On 4/4/20, 7:23 PM, "DeTomaso on behalf of Mike Drew via DeTomaso" <detomaso-bounces at server.detomasolist.com on behalf of detomaso at server.detomasolist.com> wrote:

    Fred,
    
    You almost assuredly have an exhaust leak. Before you start monkeying with your carb, have somebody rev the car (in neutral!) while you stand alongside, or sit atop the gearbox listening for a metallic clicking sound (which would indicate a leak at one cylinder) or a coarse exhaust note (which would indicate a leak at the collector (or the presence of a Hall Pantera Big Bore exhaust system))
    
    Sorry, couldn’t resist... :)
    
    When you have an exhaust leak, under acceleration exhaust gases leak out at the location of the leak. When you lift off the throttle, a vacuum effect is created inside the exhaust system which draws in air from the outside. This air mixes with unburned fuel in the exhaust tract and ignites in the exhaust system, creating the popping noise you are hearing. 
    
    New header and/or collector gaskets will probably sort you out. 
    
    Let us know what you find out?
    
    Cheers!
    
    Mike
    
    Sent from my iPad
    
    > On Apr 4, 2020, at 19:00, fred <fred at creekspeak.com> wrote:
    > 
    >    When I back off of the accelerator,  the exhaust makes a popping noise.
    >   It isn't  a backfire in the carb. Wonder if the noise is caused by way
    >   too rich setting resulting in fuel detonating in the exhaust pipes. Car
    >   is running uneven and I can smell gas inside the car. Do I need a carb
    >   rebuild or ??? Please email me. Thanks in advance.  Fred
    > 
    >   Sent from Samsung tablet.
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