Remember this manifold?
Well,it's getting coated.
It's new,so thankfully that shaves an hour or more cleaning it.
Here's some of the pics of the process though.
First it had to be thoroughly cleaned,so as not to contaminate the aluminum oxide in my blast cabinet.
Then it's off to the blast cabinet for blasting with 120 grit aluminum oxide.
This etches the surface for the coating to bite into. Sand is too dusty and inconsistent,glass beads tend to not be sharp enough to create a bite surface and close the pores of the metal.
Here's after blasting.
The bolts are in the holes mainly for media control.
Less of a chance of getting media in the holes that might escape cleaning and find its way into..anything.
They will also function as "stands" so I can flip manifold over while coating and not mess up the coating.
Next it got thoroughly blown out with 160psi of air to get any media cleaned out.
From there,high pressure wash with water to clean out anything remaining.
After that,it's into the oven for "de-gassing".
It gets heated to a temperature above curing temperature to allow anything trapped in the metal to burn off.
Cure temp is 350*,I degas at 400* for 1hr.
Even being new and having been thoroughly cleaned it smoked quite a bit for awhile.
Next I taped off several areas for this particular manifold.
Generally I don't tape anything cause I just have to clean the residue off and it's more work.
Usually just spray,and any light overspray is wiped off with acetone before curing.
But wanted to try something different,so I taped it off so I could spray heat barrier on the fuel rail mounting tabs as well as the threads where the various temps sensors go.
Generally these would be sprayed over with the heat transfer coating.
This way,i'm hoping to keep any heat from transferring into the rails,as well as the sensors.
I figure the sensors will then be more accurate reading just air and coolant flow.
Sorry,forgot to take a pic of it taped off.
Next it get thoroughly cleaned yet again,this time with acetone.
Finally,ready to start spraying.
I use a detail spray gun,i've got 3 that I use.
Heat barrier coating is first.
The product is called TLLB and is a lubricating,oil shedding heat barrier.
It goes on the mounting flanges to keep heat from the heads from transferring to manifold.
Also on the bottom,to keep oil splash from heating manifold as well as shed oil.
(most engine builders have used ceramic paint for this in the past,most NHRA cars paint under valve covers,manifold and in lifter valley)
The carb mounting flange is also coated to keep any manifold heat out of the carb (or in this case elbow and TB).
I also coat the cooling passages to keep coolant heat from bleeding into the manifold.
The runners also get this coating,to keep heat in the manifold isolated from the airflow.
Pretty tricky to get in there,takes some patience. Usually have a couple bare spots but thats okay.
Ready for flash cure-10m@200*
After the flash cure I go back over the runners with TLML which is a moly dry film lubricant.
This is what will keep the air moving and on a carb vehicle keep the fuel in suspension.
I didn't take a pic,cause you can't tell its there when spraying. When dry however it turns a dark chocolate color.
Doesn't need to be perfect or complete coverage.
Almost just didn't use since no carb,but it helps with airflow pretty sure and if water methanol is used in it then it will help same as it would with fuel.
Now to fully cure for 1hr@350*.
Last edited by playtoy_18 on Wed May 02, 2012 4:04 pm; edited 3 times in total