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replacement for an old koyo in a 1.6L

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#1
gerglmuff2

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Looks like my radiator has a steam leak. i measured it, the end tank at the top is 60mm, which means its at least a koyo 53mm core. 

I was hoping to find an identical radiator and replace it, i have no issues with cooling. but it turns out koyo seems to have stopped making the 53+mm radiators, and instead replaced them with the 36mm "hyper-V" radiators. 

Id like to not spend 600 on a Springfield dyno, and its seems like there are plenty of other radiators that should provide the cooling. and honestly, i'd be fine with the 36mm hyperV koyo if i knew it cooled as well as the one in my car. 

what says mazdaracers? is the 36mm hyperV koyo enough? 


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#2
Johnny D

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https://www.advanced...uminum-radiator

 

J~


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#3
Bench Racer

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And if the $350.00 Koyo doesn't fit your budget. Install a good OEM salvage yard radiator. If your constantly close drafting OEM salvage may not work. I've viewed them in Spec Miata and F production and under conditions of not constantly drafting they work well.

http://car-part.com/cgi-bin/search.cgi


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#4
luvin_the_rings

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Mishimoto X-Line Performance Radiator has been working great for us.  105 deg Socal desert heat and never bumped 190, even in the draft. 

lifetime warranty for crashes and manufacturer defects. ** doesn't include corrosion** 

 

Cap and magnetic drain plug included. 

 

super thin cores for better efficiency. 

 

We ran into trouble when using an engine that had corrosion in it, the radiator clogged pretty quickly.  Replaced the engine for clean one along with the radiator, and has been going strong ever since. 



#5
gerglmuff2

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i called advanced about this, they said they didnt have one in stock, but it was not 60mm core, it was ~44mm core. 

they said they often retrofit NA cars with there custom NB radiator, which is 60mm thick. my cars radiator is mounted like a normal NA though. 

 

Mishimoto X-Line Performance Radiator has been working great for us.  105 deg Socal desert heat and never bumped 190, even in the draft. 

lifetime warranty for crashes and manufacturer defects. ** doesn't include corrosion** 

 

Cap and magnetic drain plug included. 

 

super thin cores for better efficiency. 

 

We ran into trouble when using an engine that had corrosion in it, the radiator clogged pretty quickly.  Replaced the engine for clean one along with the radiator, and has been going strong ever since. 

 

this looks promising, 53mm core, ~325 buck price. probably my leading canidate


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#6
Johnny D

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http://www.good-win-...rt/61-1516.html

 

IDK why this link take you to the 99 version but there is a 90-97 version.

 

J~


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#7
gerglmuff2

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http://www.good-win-...rt/61-1516.html

 

IDK why this link take you to the 99 version but there is a 90-97 version.

 

J~

 

i am aware and can google for these parts. my real question is what are other 1.6L guys running and is that enough cooling capacity? its a shame koyo no longer makes the radiator in my car, and it doesn't feel right losing cooling capacity. 


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#8
Johnny D

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Last one, I'm done.

http://5xracing.com/...l?ref=brand:245

 

"Koyo Racing is phasing out the R1139 53mm and V1139 36mm radiators and replacing them with this new Hyper-V 36mm radiator."

 

You can still find R1139-53mm

https://www.ebay.com...ta-na/671027931

 

Or repair your old one.

J~


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We have a Winnah! - Won their 1st race... Congratulations! Beta-Tester - Assisted us with beta testing the website. Donor - Made PayPal donation Bona fide - A bonafide Spec Miata driver Novel Approach - When a paragraph simply won't do... Survive the 25, NASA Thunderhill - Survive the 25, NASA Thunderhill Instigator - Made a topic or post that inspired other Make it Rain - Made Paypal donation of $100+

#9
Justin Casey

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http://www.trackspee...e-radiator.html

Definitely on the beefy and more expensive side, but I haven’t had any issues with it over the last 4 seasons on my car.

Proven to keep temps cool when bumpdrafting at Auto Club Speedway and even during triple digit weather at Thunderhill.
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#10
gerglmuff2

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http://www.trackspee...e-radiator.html

Definitely on the beefy and more expensive side, but I haven’t had any issues with it over the last 4 seasons on my car.

Proven to keep temps cool when bumpdrafting at Auto Club Speedway and even during triple digit weather at Thunderhill.

 

wow, that sucker is HUGE. 

i assume you had to clearance the fan box for it, or go with a different fan setup? 


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#11
Justin Casey

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wow, that sucker is HUGE. 
i assume you had to clearance the fan box for it, or go with a different fan setup?


An edge of the oem fan box was rubbing on the plastic intake tube, but a tech official told me to sand down the edge to prevent a hole from being created there. I use the oem fan.

Sidenote: Hello from a fellow Minnesotan!
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#12
gerglmuff2

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Minnesotans everywhere!

im shocked it didn't push your fan box into your anti-roll bar. if it doesn't though ... 


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#13
Tom Hampton

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I've run the koyo and the SD. Here in Texas I had heating issues with the koyo. Water temp would get well into the 200s on poor cooling days sometimes over 210. Switched to the SD a few years ago. Worst cast temp is rarely over 200 now. Typically in the 180s.

Note I do not run a tstat except in January.

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