[DeTomaso] Exhaust "Popping"

[Dan Courtney]

It looks like it could be two of these. The fellow who installed the engine 
used the wrong exhaust gaskets, plus they were burned out (probably due to 
loose header bolts) and the fuel pressure regulator was set to 3.5 psi, 
which I understand to be inadequate for a Holley 750 dual pumper.
I'm having trouble finding correct header gaskets so I won't be able to try 
it again till tomorrow. The exhaust ports are regtangular while the header 
tubes are round. The Mr. Gasket set has openings too large for the header 
(the header tube diameter is smaller, meaning the exhaust port opening in 
the gasket extends over the edge of the header tube allowing exhaust to 
escape from the head). The stock ones appear to be too restrictive.
This engine is supposed to have 4 bbl heads but I'm checking the casting 
number in the morning to make sure they are not 2 bbl heads. It's an Aussie 
block so who knows.

Dan F. Courtney


Excalibur Commercial Real Estate Services
La Jolla, CA

Phone (858) 551-5455
Fax (858) 551-5456

----- Original Message ----- 
From: "Donny Williams" <Donnylee at ccwebster.net>
To: "david rehberg" <drehberg74 at hotmail.com>; <dfcex at pacbell.net>; 
<detomaso at realbig.com>
Cc: <wheelinj at netzero.com>
Sent: Monday, April 23, 2007 7:28 AM
Subject: Re: [DeTomaso] Exhaust "Popping"


>I can think one of three things as been pointed out.  I would look for the 
>following in this order
>
> 1. Exhaust Flange leak
> 2. Vacuum Leak
> 3. Very lean Idle circuit
>
>
>
>
>
> ----- Original Message ----- 
> From: "david rehberg" <drehberg74 at hotmail.com>
> To: <dfcex at pacbell.net>; <detomaso at realbig.com>
> Cc: <wheelinj at netzero.com>
> Sent: Monday, April 23, 2007 7:15 AM
> Subject: Re: [DeTomaso] Exhaust "Popping"
>
>
>> >Hi Dan;Vacum leak or valves not adjusted properly?
>>
>>
>>>From: "Dan Courtney" <dfcex at pacbell.net>
>>>To: <detomaso at realbig.com>
>>>CC: wheelinj at netzero.com
>>>Subject: [DeTomaso] Exhaust "Popping"
>>>Date: Sun, 22 Apr 2007 21:23:41 -0700
>>>
>>>"The Winged Warrior" is still getting a constant and loud "popping" out 
>>>of
>>>the exhaust each time I left off while driving. The higher the rpm the
>>>louder and longer it "pops".
>>>It's been doing this since the new (rebuilt) engine has been in.
>>>So far I've changed:
>>>Cracked distributor cap (MSD dist running off a MSD 6AL).
>>>Plug wires.
>>>Plugs.
>>>Tried a substitute carb.
>>>Retarded the timing.
>>>It has the same exhaust system as on the previous 351c and the same
>>>ignition (MSD 6AL). It never popped with the previous engine.
>>>
>>>Any suggestions?
>>>
>>>Dan
>>>
>>>
>>>Dan F. Courtney
>>>
>>>
>>>Excalibur Commercial Real Estate Services
>>>La Jolla, CA
>>>
>>>Phone (858) 551-5455
>>>Fax (858) 551-5456
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>>
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>
>