Intake manifold heat?
 

I bought a teflon insulator for my intake manifold It is supposed to decrease the transfer of heat to the intake. But it seems to be the opposite the runners are getting hot quicker than before. This is a dry intake no water goes thru it.
I'm not using any gaskets just the teflon spacer. And the car idles fine. So I doubt there is a vacuum leak.
I just bought a heat gun, so if there are no suggestions, I'm going to pull the spacer out and take the temp without it.

Re: Intake manifold heat?
 

Dunno about your problem but we use a combination of BIRCH plywood and phenolic resin spacers on our Comp car- works great for us--Comp 387

Re: Intake manifold heat?
 

Re: Intake manifold heat?
 

Yeah, Teflon is not really a good insulator, if you think about it, if it kept heat transfer down, they wouldn't put it on the inside of skillets.

Re: Intake manifold heat?
 

In the world of plastics fluoropolymers (Teflon) has a middle of the road thermal conductance. It is an excellent high temperature service plastic however wood only has about ½ the thermal conductivity of PTFE. But comparing Teflon to aluminum Teflon is 1000 times less thermal conductive.
Cork has about ½ the thermal conductance of wood or ¼ that of Teflon.
So, technically a paper or cork gasket is going to give you far better insulating properties than a Teflon one of the same thickness. Or in the case of thermal spacers wood or paper fiber insulate 2x better than Teflon or nylon.

Re: Intake manifold heat?
 

any body know of any space age material or coating that when the surrounding heat increases it "cools off"!!!! NASA must know of some thing, think "SPACE SHUTTLE".

Re: Intake manifold heat?
 

Tomorrow I going to pull the spacer out. And see if it runs cooler.
I'm not sure it is teflon. But it looks and feels like it.
When I start the motor the intake runners are the same temperature as the head. And the bolts that hold the manifold on. There is no water passages in the intake so it should take more time to heat soak. And as it idles you would think the incoming air would cool the manifold somewhat.
Icing the intake picked the car up a solid tenth last year (when I had water a passage in it)
I cut the water passage off but the manifold seems hotter than last year.

Re: Intake manifold heat?
 

It's called... Ceramics...and it is an insulator. The only product that cools off when heat is applied is sodium.

Re: Intake manifold heat?
 

Heres a link to the spacer. I didn't expect that but I thought it might help.
http://hondata.com/heatshieldgasket.html#Details

Re: Intake manifold heat?
 

The material shown in the above link is phenolic laminate material.

Re: Intake manifold heat?
 

It looked and felt like teflon to me. The one the sold me was white not blue.
It doesn't seem to work. I'll know for sure tomorrow.

Re: Intake manifold heat?
 

It does not look like Teflon. Take the temp readings and post them.

Re: Intake manifold heat?
 

After a few of minutes at idle the intake runners were 105 degrees the head next to the intake manifold was 108. As the head got hotter the runners the runners got hotter to.
I didn't have the temp gun before but I think the runners stayed cooler longer, till they eventually heat soaked.

Re: Intake manifold heat?
 

It may be too thin; the spacer looks more for a street/OEM application and it may need to be thicker for your application.
Just make your own heat spacer from a thick sheet of Black Nylon 66.

Re: Intake manifold heat?
 

The spacer is about .300 thick. How thick is the Black Nylon 66?

Re: Intake manifold heat?
 

It's available in many thicknesses.

http://tridentplastics.thomasnet.com...eet?&forward=1

Re: Intake manifold heat?
 

Thinking out loud:

Timing ?

Reversion?

Re: Intake manifold heat?
 

Hey Art, in your class are you allowed coatings ?

Ive got some waterbased ceramic that is a heat dissapation coating, stuff works great. Ive got about a half gallon of the goo left, coating the intake inside and out I can almost guarentee a big heat soak drop......problem is once it does the stuff works the other way around and will hold it in, but it takes a lot longer ? Why kill the water passage ?

Re: Intake manifold heat?
 

GOLD my wife is always cold when i am HOT it must be the gold ring

Re: Intake manifold heat?
 

Pulled the motor to check the bearings. didn't mess with the timing belt at all.
Timing light is in the trailer. I'll go get it on Tuesday and double check it but it starts easy and idles great.
As far as reversion goes. This is a different cam (much bigger) than last year. I haven't paid attention to the manifold heat this year. Each time out I've been heating the engine, to allow heat soaking. I'm finally going to a track without eyes. So I want to know what I can pick up with a cold intake.
Took a leakdown to see if I had some bent intake valves It was 3 to 5 percent (not bad for gasported pistons).
This is the motor that I had asked about the compression pressure before It is 300 pounds. I worried myself sick about it. But have just learned to live with it as a quirk with the 4 valve setup.

Re: Intake manifold heat?
 

Hi Chris

Yes I'm allowed to do anything I want to the manifold. But In the not to distant future I'll be going to a 4 throttlebody setup (that was really what I wanted the spacer for). So I'm not going to waste a lot of time on my stock type intake.

Re: Intake manifold heat?
 

Gotcha, hey Art on that note, if youre going to have them made how about outta a thermoplastic ? Or do any of the OE setups come that way ? Just a thought....

Re: Intake manifold heat?
 

Art, I do not think your timing is off and if you have a reversion problem, it not not create heat. You need an isolator made of thicker material such as phenolic, Black Nylon 66 or similar high temperature thermoplastic. I have not seen your intake location, however, is the intake above the exhaust?

Re: Intake manifold heat?
 

It is in front of the motor the header is in the rear. checked timing it is right where it's supposed to be.
I might just leave the spacer in and got to Valdosta the way it is. then try to compare intake temps to comparable ambient temerature.

http://i203.photobucket.com/albums/a...2/DSC01575.jpg

Re: Intake manifold heat?
 

fins...

Re: Intake manifold heat?
 

By looking at your intake design...you still have lots of more power left... :)

Re: Intake manifold heat?
 

http://i203.photobucket.com/albums/a...C_Manifold.jpg


http://i203.photobucket.com/albums/a...nifold2_sm.jpg


This is the manifold style of the future for me with 4 individual throttle bodies.
Total cost $1200
The present one is made from a dodge caravan base (the runners would be legal in stock LOL) with a box welded to it.
Total cost $200.

Overall. I'm very pleased by what I get out of the car compared to what I have in it

Re: Intake manifold heat?
 

Art sent u a PM--Comp 387

Re: Intake manifold heat?
 

My first thought was "why would he run a muffler up there...:rolleyes: "

Re: Intake manifold heat?
 

Don't know about mufflers, but I have a front mounted parachute
Non Functional 68 Hemi Hood Scoop == Parachute.