Painting the bottom side of a bb valley pan?
- Thread starter Lycandart
- Start date
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demon seed
The Original Demon Seed
Never heard of that, usually it's for asthedic reasons like hemi orange. Gotto check though, when you say underside you're not referring to the side of the valley pan which comes in contact with the oil are you.
Terry
camd64
Remember Landy
i painted the underside of my intake ,318, it is supposed to reduce the heat from the the oil hitting it and the combustion gases if you use a ceramic engine paint. great for me since the runners are not protected by a valley pan. maybe it works or maybe not but doesnt hurt to try.
grumpuscreature
Resident Curmudgeon
Seems to me that the air gap between the valley pan and the intake would be a better insulator than a coat of paint.
briankaplan
greenduster
The factory used a chunk of insulation under the intake.
This will help control heat transfer.
I think this would be a better way to do it.
This will help control heat transfer.
I think this would be a better way to do it.
Waaaay back in the early '70s, the trick thing to do was paint the inside of your engine (non-machined surfaces only) with Rustoleum to both seal the casting and help promote oil flow back to the pan. Never experienced any problems with my engines then.
With todays much improved technology, I believe a ceramic thermal barrier sure couldn't hurt and would probably improve insulation for the incoming fuel/air mix.
With todays much improved technology, I believe a ceramic thermal barrier sure couldn't hurt and would probably improve insulation for the incoming fuel/air mix.
moper
Well-Known Member
Right idea, wrong reason...lol. It wasnt heat. It was the reasons about (oil flowback and protection. Why hold more heat in there when it could be transferred to the air?
John Deere here in Waterloo has painted the inside of their engines, transmissions and drive axle cases for years. I'm sure it's all about oil return. toolman
moper
Well-Known Member
Lycan..waht really needs to be asked is, why put insulation there, but have the heat crossover on top of it....lol. I can't answer either on of those...lol.
Boys, it's called Glyptol. Eastwood and a bunch of other places sell it, and it's not cheap. It's used to help speed the return of oil to the pan. I offer it as an extra service for the undersides of intake manifolds, valley pans, etc., and quite a few customers have taken me up on it. Here's what it looks like on the bottom of a 6-pak.
Here is the blurb from our supplier on intake manifolds:
You will also aquire heat from the hot oil that may be tossed up under the underside of the intake manifold. This means we want to apply a thermal barrier ( TLLB, CBC2, CBX, MCX ) to the bottom of the intake manifold, the flange area where it would bolt to the head and also the flange area where the carburator would bolt to the intake manifold. This will reduce the amount of heat that enters the manifold itself, keeping the manifold cooler. Typically, a normally asperated engine will see a 1% improvement in power for every 10 degree drop in carb air inlet temperature. A Turbo charged engine will see a 2% increase. Keeping the manifold cooler than normal allows an engine to generate more horse power. In addition to this, you would coat the top of the manifold with a thermal dispersant such as our TLTD. This means that the heat that does get into the intake manifold will be more rapidly dispersed into the air moving over it, thus cooling the intake manifold further. This gives you a greater chance of creating more horse power by reducing the inlet temperature. You can also coat the inside of the runners in an intake manifold. You can use 1 or 2 coatings. A single coating that we recommend would be our dry film ( DFL-1, TLML or CERMA LUBE ). These are known as 'fluid retaining coatings' and the fuel/air mix as it passes through an intake manifold on a carburated engine is treated like a 'fluid in motion'. The coating will have a tendency to create a small amount of boundry layer turbulance which will reduce fuel drop-out. You may also apply a thermal barrier to the inside of a runner first, then the dry film over it. If you're doing this, we recommend using our TLLB with TLML over the top of it. You not only create the boundry layer turbulance, you further reduce the amount of heat that does enter the fuel/air mix.
You will also aquire heat from the hot oil that may be tossed up under the underside of the intake manifold. This means we want to apply a thermal barrier ( TLLB, CBC2, CBX, MCX ) to the bottom of the intake manifold, the flange area where it would bolt to the head and also the flange area where the carburator would bolt to the intake manifold. This will reduce the amount of heat that enters the manifold itself, keeping the manifold cooler. Typically, a normally asperated engine will see a 1% improvement in power for every 10 degree drop in carb air inlet temperature. A Turbo charged engine will see a 2% increase. Keeping the manifold cooler than normal allows an engine to generate more horse power. In addition to this, you would coat the top of the manifold with a thermal dispersant such as our TLTD. This means that the heat that does get into the intake manifold will be more rapidly dispersed into the air moving over it, thus cooling the intake manifold further. This gives you a greater chance of creating more horse power by reducing the inlet temperature. You can also coat the inside of the runners in an intake manifold. You can use 1 or 2 coatings. A single coating that we recommend would be our dry film ( DFL-1, TLML or CERMA LUBE ). These are known as 'fluid retaining coatings' and the fuel/air mix as it passes through an intake manifold on a carburated engine is treated like a 'fluid in motion'. The coating will have a tendency to create a small amount of boundry layer turbulance which will reduce fuel drop-out. You may also apply a thermal barrier to the inside of a runner first, then the dry film over it. If you're doing this, we recommend using our TLLB with TLML over the top of it. You not only create the boundry layer turbulance, you further reduce the amount of heat that does enter the fuel/air mix.
Nicely done Boxer!!! :-D You're a true asset to our profession and your boss should be proud to have you.
And both of our bosses are gonna kick our butts for talkin shop on the lunch hour. LOL!!!!
And both of our bosses are gonna kick our butts for talkin shop on the lunch hour. LOL!!!!
ramcharger
Dismember
That was to keep the oil from burning/caking then sticking to the underside on the manifold. In other words, the insulation was not there keep the manifold from absorbing heat from the oil but keep the oil from getting scorched on the hot manifold under the crossover.
Any OEM manifold that has a heat crossover will have some sort of plate or insulator to prevent oil caking.
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