Mudhorn Passed Smog with 3FE manifolds! (1 Viewer)

elripster

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Friends today is a glorious day. It is such because Mudhorn didn't just crush a smog test but did so with 3FE manifolds here in good old SoCal!

There a few good threads about adding 3FE manifolds to the 2F so I won't go into that. I machined down the 3FE manifolds where I could with my mini-mill and JB Welded a stack of cut washers on the intake side where the mill could not reach.

The wrinkle here is that had to retain the EGR if I wanted any chance at passing smog. I tried welding two sections of EGR pipe together but I couldn't get them to seal and the bends were too close to the all of the emissions and steering plumbing. The more I tried to tweak them the more it cracked... rinse - repeat. I searched and searched. Just as I grew discouraged I found a high temp gas line with fittings that were similar in size to the original. However, they were a standard thread (3/4" MIP/FIP) where the truck is the M26X1.5mm metric thread. I then searched for an adapter and actually found a male and female version to connect to the pipe just as it arrived.
Amazon product

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The adapters I found where these... the kicker is for one of them they had a 12 piece min order so I have 11 left. If anyone decides to do this PM me and I'll make you a great deal. I also have an extra of the other since I ordered 2 just in case.


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Here are some install pics. This length gives the EGR gases some opportunity to cool which should help reduce NOX.
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Despite the truck likely running a little lean, NOx was nice and low. I theorize that because the 3FE manifolds do not superheat the air like the 2F one did the cooler intake temps are helping reduce NOx production.

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The best part, performance is noticeably improved. The engine has gained 1000 RPM of useful torque production. It feels more like my 3FE but with that 2F long strong torque-love.

I was able to retain the necessary-for-visual-inspection air duct between the air cleaner and manifold by using an unused bolt hole oh so conveniently located in just the right place.

Frank
 

elripster

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This distributor has passed smog in San Diego 2X so far.... it also makes the engine run better.
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Frank
 

elripster

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The truck had been down for long that I totally had the 60 glow driving back from the smog shop. I think I need cold scotch!


Frank
 

DFXR

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The truck had been down for long that I totally had the 60 glow driving back from the smog shop. I think I need cold scotch!


Frank
Wow. This is very cool. Way to MacGyver it with the propane hose!

I know that "just passed smog" feeling. There is always a little bit of dread mixed in... like "what next?"

I spent big on a NOS 2F manifold a couple years ago, but if I hadn't I'd be thinking about doing this.
 

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