Cylinder 4 extra cooling mod - heard of this?
#1
Posted 29 August 2020 - 11:27 PM
http://shop.getadomt...GTC8UvMopiW_xhY
Is this something legit? Im guessing it would most likely help high boost/prolonged load applications. Seems easy enough to DIY for less than the item listed.
This and parallel fuel rail mod could be good long term insurance to help with longevity with my build.
Thoughts?
Im curious about it - it seems so simple to do I dont see why Subaru didnt do it themselves. And it makes sense - cylinder 4 is the only cylinder that doesnt have coolant constantly bleeding off to something else, other than cylinder 2 that gets the freshest coolant from the water pump.
Cheers
Bennie
https://www.imageshack.us/i/po1BKrxbj
El Freddo's Pics - El_Freddo's youtube
#2
Posted 30 August 2020 - 09:29 AM
Parallel rails is a bit snake oil imo. Fuel reg manages pressure at the end of the rails by letting fuel out. Can't have varying levels of pressure over the system.
For a 400kw engine it's probably a good idea, for 150kw it's fine on stock plumbing
#4
Posted 31 August 2020 - 04:02 PM
So it’s not taking IN coolant, it’s letting it OUT to the heater return line.
That’s how I’ve understood it anyway.
Definitely a DIY mod I’ll be looking into.
Cheers
Bennie
https://www.imageshack.us/i/po1BKrxbj
El Freddo's Pics - El_Freddo's youtube
#5
Posted 31 August 2020 - 04:09 PM
IIRC we used to do something similar with the old XE Falcons.
We would drill and tap a hole into the water jacket at the rear of the head and run a line back to the radiator top hose via an adapter. The idea was if any steam pockets formed in the rear of the head, they could make their way directly to the radiator. This sometimes is called 'nucleus boiling'. When the coolant suddenly boils it can, over time, erode the metal in the head.
The cooling system would have to be the most underrated system on a car...
If I told you I was a compulsive liar, would you believe me?
#6
Posted 03 September 2020 - 12:44 PM
MY00 Red RX, a nice daily that was sold off once the B4 became reliable...
MY02 Blue B4, aka 'The Project' - v8 JDM STi engine package and assorted other 'goodies' - Sold, then bought back for parts. Stripped and crushed.
MY03 Blue RX, the newer old daily, pretty well more B4 than RX now... In the process of being converted to the track toy... Watch this space!
MY02 Silver Wagon, H6 conversion, full blue/black leather and almost full black interior to go with it.
MY03 White/Silver H6 Outback, donor car for silver waghoon.
MY97 Silver RX, acquired to become track car, but plans changed. To be stripped and scrapped in time.
#7
Posted 03 September 2020 - 02:19 PM
I did this to my brothers engine when it was out. Had to wait for the plug in the back of the block to come in off back order (typical...). Actually ordered 2 of them, 1 is still in the shed somewhere.
Got some brass tee's (got 2, 1 still in the shed somewhere.) from somewhere and the heater hose from Supercheap (I think).
He's been driving it for 6 months or so and hasn't said anything about temperatures etc but he is the type were the only maintenance he does is putting petrol in it.
I used the Subaru SLLC (super long life coolant, blue stuff) as I had a few bottles (and still do).
Fair bit of info, part numbers etc;
https://forums.nasio...d.php?t=2882734
2002 Outback - it's gone...
#8
Posted 03 September 2020 - 08:20 PM
OEM nipple as used on the EJ25D kit from Subaru as a HG fix by reducing pinging through reducing heat accumulation in cylinder 4:
21170AA020
Currently not available on partsouq
Cheers
Bennie
https://www.imageshack.us/i/po1BKrxbj
El Freddo's Pics - El_Freddo's youtube
#9
Posted 04 September 2020 - 12:24 PM
It's NASIOC... 2 people actually know things and another 7 think they know things.
That's the part I've got a 'spare' in the shed.
2002 Outback - it's gone...
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