Engine trouble, help please
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Elder User
Joined: Dec 2006
Posts: 881
Likes: 1
From: Sudbury, ONT.
Now that you mention it, last winter I replaced my existing 3" dual exhaust with a new 2.5" dual exhaust. I assumed the 2.5" would still flow well enough for 400ish HP? Perhaps not
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
I would have thought so also but a 460 is a heck of an air pump! Are all of the pipes mandrel bent?
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Elder User
Joined: Dec 2006
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From: Sudbury, ONT.
The pipes are all mandrel bent, I had to cut/ weld all the curves myself. I was able to get a better look at the plug itself today. It developed a small rust spot in the middle that finally blew out I guess. The plugs are just mild steel, and I guess the exhaust gasses are not healthy for them. I ordered two more (just in case the other side lets go).
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
The pipes are all mandrel bent, I had to cut/ weld all the curves myself. I was able to get a better look at the plug itself today. It developed a small rust spot in the middle that finally blew out I guess. The plugs are just mild steel, and I guess the exhaust gasses are not healthy for them. I ordered two more (just in case the other side lets go).
Are your plugs reading lean by chance? I know you know this Merc but for the googlers out there , a lean mixture creates hotter exhaust.
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Elder User
Joined: Dec 2006
Posts: 881
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From: Sudbury, ONT.
which indicates a leaner mixture. Yet when it's idling, it'll make your eyes water cuz it's so rich....
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
But is their any way to thread them & put in pipe plugs??
Just a thought..
Orich
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Thread Starter
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Elder User
Joined: Dec 2006
Posts: 881
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From: Sudbury, ONT.
I thought old trucks were always supposed to need tinkering!
Pipe plugs are a good idea.....really good idea. Thank You!
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Elder User
Joined: Dec 2006
Posts: 881
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From: Sudbury, ONT.
Holley 770CFM Street Avenger.
I bolted it on right out of the box, and it has always worked well. It idles rich when cold even with the choke off, and runs a little lean on the top end. I've though about changing jets, but it's something I've never done before.....not that has ever stopped me with this truck before.
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
I have also fixed those burned out plugs a different way. Since that is the provision for air injection, there is a bolt hole right by the welsh plug where the rail was bolted down. I have made a heavy strap and sealed it with high temp silicon to bolt into the bolt hole and cover the welsh plug hole. But only when the space was too confined to have access to the welch plug.
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Elder User
Joined: Dec 2006
Posts: 881
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From: Sudbury, ONT.
Making your eyes water is more likely lean. That is unburned hydrocarbons that burns your eyes, a product of incomplete combustion due to lean mixture. Take it to a shop with a good 4 gas analyzer (and someone who knows how to run it) and you can find out more in 10 minutes than hours of trial and error tuning.
I have also fixed those burned out plugs a different way. Since that is the provision for air injection, there is a bolt hole right by the welsh plug where the rail was bolted down. I have made a heavy strap and sealed it with high temp silicon to bolt into the bolt hole and cover the welsh plug hole. But only when the space was too confined to have access to the welch plug.
I have also fixed those burned out plugs a different way. Since that is the provision for air injection, there is a bolt hole right by the welsh plug where the rail was bolted down. I have made a heavy strap and sealed it with high temp silicon to bolt into the bolt hole and cover the welsh plug hole. But only when the space was too confined to have access to the welch plug.
Really?! I always thought it was from being too rich.
That's got me thinking....
The truck always runs awesome in the warm/ hot weather of summer. When the weather cools off in the fall, the truck doesn't seem to have the "punch" that it does in the summer. It doesn't run poorly, it just doesn't feel the same. I've had two different Holley Street Avengers on this truck and they both performed the same. Up here, (Northern Ontario), anything with a carb always ran better in the fall, with the cooler/ denser air. With my Holley, I figured it was jetted to run better in the hotter Southern USA, not the frozen North? I always put the truck away in October anyway, so driving it in the cooler weather was never much of a big deal. When I get the truck back together, again, I'll do some reading up on carb jetting.
And thanks for the tip about those plates you made. Between you and Orich, I have a few different ideas to permanently fix this exhaust leak issue.