Anyone ever done this?A retired ford mechanic said they would sometimes do this,using epoxy,or an epoxy paint.What is the benefit,what are the risks,and does anyone have reccomendations as to methods/materials?Thanks gentlemen...and gentlewoman,er,person, Janet...Dear!

 

Sounds a wee bit insane. Might work.

Perhaps a smooth epoxy coating would 1.) affect the flow... though there is something about boundary layer air that wants broken up. 2.)The volume of the intake would be reduced... though not much depending on the application. 3.) This may have been a way to fix a crack from the inside.

I don't see a benefit in either of the first two notions above. I guess in desperation you could repair a crack in the manifold from the inside. Who really knows? The down side appears to be that you would be messing up a perfectly good intake manifold or not fixing one that is already messed up.

I'd avoid putting epoxy down my intake, Buzz. best. himmelberg

 

Before I did anything like that I would test the stuff with whatever type of fuel your likely to encounter.

 

I'm no fuel intake expert... I'm still studying to get to rookie grade...

but I thought the rough finish helped keep the atomization up...if it's slick it tends to puddle ??? I know I remember that from somewhere didn't I ???

It might be a different thing in full blown race engines... but on the street with different throttle positions and varying vacuum... I don't know ???

john (dumb...but cool)

 

with the Nascar enginge they want a degree of roughness to atomize the fuel. I can imagine why you would want to smooth the intake


Jet Jock
"I drive a 'girly' 302 because, when I want to go fast, I go to work"

 

I use to build racing engines for Ed Pink. I have never heard of anyone painting the inside of a manifold? That's crazy. If its in the port themselves, the paint won't last regardless of epoxy. Take my advice. Go buy a dremel grinder and smooth out the ports. That will work.

 

He wasn't talking about Glyptol was he? They used to paint the inside of blocks to seal the porous castings. But I've always understood that the roughness was desirable on intakes as John indicated.

 

Don't paint the inside! If the coating ever fails it will damage your engine. It's not worth the risk. JMHO John

 

I think he was talking about the Glyptol as mtflat suggested. He was probably saying paint INSIDE the intake valley. It would aid the oil drainback to the pan.

 

I believe, as suggested, that intake manifolds have been coated to seal them up because they failed a leak test due to porosity. I would expect that this coating is very thin, just enough to seal, and that it is certainly compatible with fuel. I have heard of this as a repair/rewqork procedure for OEM parts to the engine plant so the caoting would have to have been OEM approved and tested.

Regards, John

 

I was told by cleaning my plastic intakes with carb and choke cleaner it would strip away a special coating they put on them at place they make intakes. Can anyone confirm if they do this and if they do can I buy it to re coat them on the inside. So if this is true I would not spray anything inside, cause this coating is supposed to reduce carbon buildup

 

I’ve never heard of this on an intake., You may be referring to throttlebodies. It is very true that you need to use throttlebody cleaner, and not carb cleaner because of the special coding that is applied.

 

Woo! Cool, so wheny say throttle body you are referring to the metal piece that attaches to the front of upper intake/plenum with the round air adjustment flap right?

 

Yes, and for those of you with modern engines, keeping your throttle body clean is easy. And, if you don’t, you can have idle problems and even generate codes.

 

Thank you brother, I'm trying to get this new 4.0l v6 sohc mfg before 03/00 installed and the mice have chewed all my stickers off that go with my steps to re install. 😵