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Cylinder 4 extra cooling mod - heard of this?


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#1 El_Freddo

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Posted 29 August 2020 - 11:27 PM

I was doing some facestalking tonight on Mrs El_Freddos account when I came across this apparent mod:

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.

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#2 Barbbachello

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Posted 30 August 2020 - 09:29 AM

Cylinder 4 mod defs has merit.

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

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#3 BG11XV

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Posted 31 August 2020 - 01:18 PM

look up ryder racing mate 

 

https://ryderracing....inder-4-mod-kit


PHOTOSHOP MOCK UP

 

 

 

 


#4 El_Freddo

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Posted 31 August 2020 - 04:02 PM

I like how everyone has a different understanding on how this works. My theory is that this mod allows more coolant flow over cylinder 4 by pushing coolant out to the heater return line and back to the water pump - much like the turbo getting its coolant from behind cylinder 3 and the oil cooler getting its coolant from under cylinder 2.

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
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#5 RX25SE

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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...


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#6 allpaw4

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Posted 03 September 2020 - 12:44 PM

Going to look at doing this I reckon. Certainly has merits. And added longevity is where its at. No good going fast if you suddenly stop in a spectacular fashion not long after...

MY02 Blue B4, aka 'The Project' - v8 Spec C engine package and assorted other 'goodies' - Sold, then bought back for parts. Stripped and crushed.

MY97 Silver RX, aka 'The Track Toy' - All good bits from B4 will *eventually* find their way into this...
MY03 Blue RX, the new daily, pretty well more B4 than RX now...


#7 bobbyjimmy

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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


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#8 El_Freddo

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Posted 03 September 2020 - 08:20 PM

Geez, that thread turned into a proper shit fight!

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
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#9 bobbyjimmy

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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.


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