Fuel rail insulators

[Hal]

The oem rail has plastic insulators under it, but the mounting bolts still transfer heat to the rail.

I made up some phenolic insulators that cover the bolt (1st photo), but the bolt hole in the rail had to be enlarged to accommodate them. Combined with a heat wrap (like DEI), rail temps are lower meaning that fuel doesn't boil off as easily while the car sits after having been driven. The oem black spacers are still used in their oem location.

I also made up something similar for my Magnus fuel rail (2nd photo).

 

[DSM_PWR]

Wow!

Now thats a new idea

Although i was never aware that "Fuel Boiling" was ever an issue ... care to elaborate?

 

[reno23]

^^^Good call on that! I have insulated the major parts with phenolic insulating gaskets from Outlaw Engineering, but I totally missed that part of the fuel rail. I might look into that in the future. And before anyone says that this, such as this fuel rail bolt insulators is too much for something negligible, I would be the first to argue. For instance, heat insulation/separation is too important for turbo applications where i'm at.

 

[Hal]

While the engine is running, the rail is cooled by fuel flowing thru it. Whether the fuel is heated to a point that it makes any difference isn't what I'm concerned about.

It's what happens when you shut that engine off.

The heat from the head is absorbed into the rail via the bolt heads as well as from the under hood air temps.

That heat can cause the fuel in the rail to turn to vapor. If that happens, the car is hard to start and runs rough for a short time.

These parts deal with one part of the transfer process.

 

[crimsondragon]

Have you tested it out yet? I typically find the car harder to start when cold or in dead of winter. Given a nice long drive where it's fully warmed up, shut off, then start back up like 20-30 mins later when fuel pressure has completely bled off, and it starts on the first revolution.

 

[Hal]

It made a noticeable difference, but I run E85 which turns to vapor easier.

 

[greengoblin]

That is a very good idea Hal. Great work. I wonder if that would help with the black goo problem people are having with e85.


Kevin

 

[Ludachris]

Nice. How did you go about making these Hal?

 

[Hal]

I used my cnc lathe to turn them from some small square pieces that I cut from a larger piece of bulk stock.

 

[Gamble97]

Nice, I will be buying some.

 

[reno23]

Nice, I will be buying some.

^^^ Where? They are "one off" pieces, aren't they?