[DeTomaso] Exhaust "Popping"

[Donny Williams]

Dan-  Ever think about just taking your ride down to one of the many Pro 
engine shops you have in California and having them go over your engine? 
Might be some peace of mind in that....

But it sounds like your onto something with the gaskets and the popping 
problem.


----- Original Message ----- 
From: "Dan Courtney" <dfcex at pacbell.net>
To: "Donny Williams" <Donnylee at ccwebster.net>; "david rehberg" 
<drehberg74 at hotmail.com>; <detomaso at realbig.com>
Cc: <wheelinj at netzero.com>
Sent: Tuesday, April 24, 2007 12:49 AM
Subject: Re: [DeTomaso] Exhaust "Popping"


> 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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