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> Radiator hose size for a Subie conversion?
CptTripps
post Oct 29 2016, 03:46 AM
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I need some help from the group before we go too much further right now.

When I bought my car, it had a V8 conversion in it. The radiator hose was only 1" throughout the car. Temps ran just fine.

I'm converting it to a Subie EJ20, and I went with the same size hose throughout the car. I'm using a dual-pass all aluminum radiator and silicone hose. Its fittings are 1.5" on the radiator and the engine, which isn't a problem, as we can adapt it to 1". But before the work is done, Scott sent me an email asking if I'm SURE that 1" is OK.

I was thinking that the V8 as a much bigger displacement engine, and the radiator wasn't as nice. So with a smaller engine and better radiator, that 1" would be fine. Someone at some point told me that 1" would be fine...but I just want to be sure.

Can I get some second/third/fourth opinions?


Thanks guys.
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76-914
post Oct 29 2016, 09:53 AM
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Doug, I'm running 3/4 & 7/8 w/o any cooling problems. I will be changing over to 1.25 as a precaution to prevent excessive pressure at high RPM. I made this up in my own mind with nothing to substantiate it other than the 3.0 needing a head gasket replaced. If I were running an on demand electric pump I wouldn't even consider going to the 1.25". Glad your getting this completed. The Trifecta (You,me and Chris) will soon be complete. (IMG:style_emoticons/default/beerchug.gif)
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CptTripps
post Oct 29 2016, 04:03 PM
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Trifecta? More like "Holy Trinity"!!

3/4 seems way too small, but if you think I'll be fine with 1".

Any other opinions?
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JRust
post Oct 30 2016, 01:37 AM
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1" will be fine. I'm running the gates green stripe that is 1 1/14" & I have never had a heat issue not matter how hot a weather. A NA suby motor just doesn't take much to cool. I think you will still move plenty of water with 1". So I wouldn't worry to much about changing it.
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Chris H.
post Oct 30 2016, 11:22 PM
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Yeah you should be fine with 1" Doug. Renegade Hybrids sells 1" hot and 1.25" cold with their radiator kits designed for V8s, some with serious HP.

I switched over to 1.25 and mine runs VERY cool. I'm planning to downsize the radiator to a square 19x19 and lay it flat up front so I can reclaim some trunk space it's running so cool. Can't wait to hear that thing run! (IMG:style_emoticons/default/beerchug.gif)
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A&P Mech
post Oct 31 2016, 05:48 AM
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I'm running 1 1/4" gates with a 2.5L n\a Subie. My car runs 180 degrees no matter what the outside temp is.
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CptTripps
post Nov 1 2016, 06:57 AM
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Thanks for the help guys. Just wanting to make sure we're doing the right thing.
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JRust
post Nov 1 2016, 03:45 PM
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QUOTE(CptTripps @ Nov 1 2016, 05:57 AM) *

Thanks for the help guys. Just wanting to make sure we're doing the right thing.

By doing a Subaru conversion (IMG:style_emoticons/default/blink.gif)

Absolutely (IMG:style_emoticons/default/aktion035.gif)
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Costa05
post Dec 21 2016, 04:37 PM
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Are you guys running the radiator hose on the bottom of the car or through the interior tunnel on your conversions?
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flmont
post Dec 21 2016, 05:07 PM
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I did 1 " steel lines under the car,..but they duct up nice and tight.
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post Dec 21 2016, 07:09 PM
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QUOTE(Costa05 @ Dec 21 2016, 02:37 PM) *

Are you guys running the radiator hose on the bottom of the car or through the interior tunnel on your conversions?

Either way works. (IMG:style_emoticons/default/beerchug.gif)
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mepstein
post Dec 21 2016, 07:39 PM
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I'm going under the car with gates green stripe. It seems to work fine in that location and keeps it simple and easy. I'm not going really low with the car.
Just one of many ways to make it work.
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