Gernby

I don't think Honda should use a paper one either. I think Honda should be using gaskets like the one Hondata sells. I often wonder how much better it would have been if Honda had lined the inside of the intake manifold with some sort of insulating material (epoxy, ceramic, jet hot, etc.).

Destiny2002

I thought I saw the Intake manifold is fed with engine coolant. Wouldn't this make the heat transfer through the gasket a non-issue?

cjb80

There is a little known trade off with the intake manifold. The ECU uses water temp to determine if the motor needs to be warmed up. Basically based on water temp the motor will add tons of fuel (like 30% more than the normal operation fuel map.) the reason why is because when the metal in the motor is cold the metal actually pulls the fuel out of the air stream and it will stick to the sides of the intake runners....

The water circulates through the intake manifold in stock form so therefore it can be reasonably assumed that the temp of the metal in the intake manifold is close to the temp of the water.

When you cut off the flow of water to the intake manifold, the intake manifold runs cooler. When you turn off your engine from a decent cruise, and you let it sit for a while, the water temperature will slowly cool. The metal will cool much faster.

Say you come back 20 minutes later, now the water is close to operating temp, but the intake manifold is not.

Sooo..... for about 4-5 minutes the car will run slightly lean.

Not to scare anyone, just something that happens..

Chris

Gernby

The intake on the F20C cannot be shielded from the heat of the coolant, since ALL coolant passes through it. This is not the case on other Honda engines.

The coolant passes through a short passage past the #4 cylinder. The Hondata gasket will prevent most of the heat that is transferred from the head into the manifold, but not from the coolant. This means that the intake runners closest to the front of the engine will be cooler than the intake runner for the #4 cylinder.

This doesn't mean that the Hondata gasket isn't effective. It will reduce the overall temperature of the manifold (and the air that passes through it).

Destiny2002

I don't believe it unless you can show me the difference in temperatures before and after using precision thermocouples attached to each object. Not that I'm a skeptic, I just won't go through all that work without some proof.

Gernby

If you haven't already seen it, Marcucci did an excellent writeup about the benefits and installation process for the Hondata gasket (Here).

Gernby

Marcucci used several temperature logging "things" to measure the benefits. See my previous post.

Destiny2002

That's helpful. Exactly what I needed to see... Thanks!

moyopoyo

larry, check your PM please!

vtecskunk

that usually takes about an hour or two with a razor blade