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hendy

Second radiator any difference.?

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I know they cool the engine more & potentially giving it more hp at running race speed etc.

Over winter planning on giving the bike a tune & going over.... So thought about double rad but as you know there expensive item... So thought would do my research to see if anyone has one & noticed a difference? Thanks 

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IMHO there will not be a noticeable gain in engine capability when using a second rad, unless your bike is habitually running at excessively high temperatures.

The OEM's radiator should be sufficient for all but the most highly-performing engines, but there are a few mods you can make to improve efficiency for race use...

 - Remove the fans. They are useful for drawing air through the rad, but only at very low speeds. At anything over ~20mph they will hinder airflow and inhibit cooling.

 - Remove the thermostat. This is used to direct the flow of coolant (water) and meter between the radiator and the cooling jacket, depending on temperature. For race use they can be removed, but (i) you may need to provide some form of compression relief for the seal, depending on the design of the thermostat housing, (ii) the bike must be thoroughly warmed up and heat soaked prior to use.

 - Retain any pre- or post-rad ducting, which is important to help guide air into and away from the radiator efficiently.

 - Make sure your rad is in good condition, with straight fins.

Edited by 53 Stix
spellcheck

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Now that's a reply 👍 

 Nice to get some proper info instead of one word answers 😬

Thanks for your In put.. decided if one pops up second hand will have  it but seems silly to go spending big bucks on little gains by the sound of it .... just try to go a little faster on the bike 😜 Cheers 

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Thicker radiators do improve cooling but also increase drag. Before you worry about new radiators make sure the fairing meets the radiator to reduce air going around it rather than through it.

Crescent always used to increase the side tanks on their stock radiators but keep the standard core as the additional thickness wasn't worth the additional drag.

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If you are hard on the gas at a big warm circuit you can expect a stock rad to struggle to get rid of the heat - especially on the pitlane entrance when it will boil!  An additional rad helps in these hot situations ie above 20 degrees air temp.  At least once fitted you can always blank them slightly but we have experienced overheating many times without.

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