pre heater hose route

[turfman454]

1984 Brat with 1.8. Guys where the preheater hose from the bottom of the air filter go once it leaves the air filter housing. Most run to the exhaust somewhere. Am i missing a bracket or what. Its the silver looking hose that looks like a small dryer vent hose. 

[pksjeep]

If it is the stock header it should be on the passenger side  near where it bolts to the head. I have also seen a pipe tack welded to the header  on the passenger side . The pipe isn't welded solid it must allow a little air flow around it . Copy this description into eBay and it shows the pipe sticking out. 

Magnaflow Catalytic Converter Direct Fit 1980-1987 Subaru Brat 1.8L

Paul

Edited December 23, 2019 by pksjeep

[turfman454]

mine is all original and i have had it since new. I just cant remember if there was something it slip into. I dont think it just hangs loose

[el_freddo]

There’s a pipe that it slips onto and it’s clamped in place by a tensioned wire ring, same as what’s under the intake tract of the air cleaner housing at the other end of this pipe. 

Cheers 

Bennie

[turfman454]

Bennie you have a pic of yours

 

[pksjeep]

If you look from the bottom of the car where the passenger side pipe comes out of the head you will see the tube that sticks out pointing to the front of the car. The tube from the air cleaner slides on there with the clamp that was mentioned  in the other post by Bennie.

[el_freddo]

11 hours ago, turfman454 said:

Bennie you have a pic of yours

Sorry mate I don’t. And I can’t find one on google. Mine is missing and not really necessary in Oz most of the time. 

Cheers 

Bennie

[DaveT]

Generally. ..  starting at the air cleaner,  it should angle back and to the side, then  turn down toward the exhaust pipe.  The should be a heat sheild with. Pipe stub, same size as the one on the air  cleaner. 

 

[mkoch]

Make sure the stub the pre heater hose connects to is a true air heater.

 

Many aftermarket y pipes just put a dummy pipe there.

[turfman454]

On 12/24/2019 at 8:00 AM, DaveT said:

Generally. ..  starting at the air cleaner,  it should angle back and to the side, then  turn down toward the exhaust pipe.  The should be a heat sheild with. Pipe stub, same size as the one on the air  cleaner. . Thanks. I think the stub you are talking about is missing and i thought the same

 

 

[el_freddo]

On 12/26/2019 at 12:05 PM, mkoch said:

Make sure the stub the pre heater hose connects to is a true air heater.

 

Many aftermarket y pipes just put a dummy pipe there.

A what? All the aftermarket Y pipe needs is a pipe welded to the RHS exhaust that drops from the header pipe. This pipe only needs to have two decent tack welds to hold it on. Heat will transfer very easily to the intake air charge. 

This system is only used a low revs, so it’s not like it needs to be sucking pure hot air at a great rate of knots, nor would you want it to be once the engine is at full operating temp. 

 Cheers 

Bennie

[DaveT]

There is a temperature controled air valve in the air cleaner that selects the heated air or the regular under hood inlet.  And when the air is cold,  you do want a real amountil of warmed air going into the intake.  It helps when the engine is cold, and when the conditions are right for carburetor icing.  Low temps, high humidity and light throttle can combine to make ice in the air path.