heater pipes....

MostlyMonki · Posted: Sun Jun 01, 2008 2:33 pm Post subject: heater pipes....

slowly figuring out which hose is which in my engine bay, but im not sure about the heater ones. can anyone point me in the right direction? i'm only going to loop them for the time being anyway.

'93 ej20t by the way.
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'72 Ratty Bug - Subaru EJ20 Turbo motor.

rjes · Posted: Sun Jun 01, 2008 5:48 pm Post subject:

Feed = end of coolant manifold
Return = steel pipe from thermostat across the two cylinders on the starter motor side of the engine, ending near starter motor
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MostlyMonki · Posted: Sun Jun 01, 2008 7:05 pm Post subject:

thanks Richard. Happy

now im just left with a couple on the header tank... the top (small) one is the overflow (so i can vent that?), the big top one is the turbo return, the other big one (on its own on one side) looks like the main coolant outlet... so what's the small one underneath the overflow?
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'72 Ratty Bug - Subaru EJ20 Turbo motor.

ricola · Posted: Mon Jun 02, 2008 9:21 am Post subject:

The small one that is in the cooling circuit coming off the top of the header tank is the rad top bleed.
The small one that is on the side of the cap bit is the overflow pipe, this must go to an overflow bottle. The subaru system is designed with a header tank which is too small, so the coolant expands when hot into the overflow tank, when it cools back down it siphons the coolant back into the system. If you don't have this hooked up properly you will lose coolant from the system every time you run it and will get air into your system and problems with running temps...
Rich
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MostlyMonki · Posted: Mon Jun 02, 2008 10:15 am Post subject:

hmm ok, so whats the bast way of rigging it up... get a much bigger tank with 2 less pipes, and lose the overflow and rad bleed?
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'72 Ratty Bug - Subaru EJ20 Turbo motor.

ricola · Posted: Tue Jun 03, 2008 10:23 am Post subject:

In my speedster I ran it for ages with a pipe on the overflow of the header tank into a 0.5l coke bottle. Seemed to work OK!

This time I will use a bigger header tank, may well end up getting an ally one custom made but I'd prefer to use a plastic one so I can keep an eye on levels..
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MostlyMonki · Posted: Tue Jun 03, 2008 12:51 pm Post subject:

ricola · Posted: Tue Jun 03, 2008 2:13 pm Post subject:

If you can't connect it up somewhere else in the system to help keep air out of high points just blank the rad one off...
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MostlyMonki · Posted: Tue Jun 03, 2008 3:50 pm Post subject:

cheers Rich much appreciated!
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'72 Ratty Bug - Subaru EJ20 Turbo motor.