TR674 Posted March 3, 2015 Report Share Posted March 3, 2015 I don't usually take my Triumph out on a hot day, but I had to take it out on a 40C day a couple of weeks ago, which included a short run on the freeway. With an electric fan installed, it maintained 1/2 way mark on the temp gauge doing around 60km/hr. However, once I got on the freeway at 100km/hr the temp jumped to 3/4 very quickly. It only came down to 1/2 when I got off the freeway and back to 60km/hr. I have the cardboard radiator valance installed. Is it just a case of too much wind pressure at higher speeds in front of the grille, reducing the flow of air thru the engine bay? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted March 3, 2015 Report Share Posted March 3, 2015 Do it again but this time with the bonnet popped open, see if that changes the temp at 100 km/hr Peter W Quote Link to post Share on other sites
TR674 Posted March 4, 2015 Author Report Share Posted March 4, 2015 Peter will do, but as it's autumn now, I doubt we will see another 40C day. I'm also due to change coolant, that may help too. Regards Craig Quote Link to post Share on other sites
Peter Cobbold Posted March 4, 2015 Report Share Posted March 4, 2015 At 100kph on the flat the engine will be working at a bit over double the power at 60kph. http://www.e31.net/resistance.html So the rad has to dissipate heat twice as fast to keep gauge constant. Try it on a long steep hill where it will use serious hp. Mine runs over half even on cool days - the thermostats might be different. Peter Quote Link to post Share on other sites
Graze Posted March 4, 2015 Report Share Posted March 4, 2015 Craig the way the weather is now ill bet you get another hot day Somewhere between 36-39 here in Brisbane tomorrow Graze Quote Link to post Share on other sites
Damson6 Posted March 5, 2015 Report Share Posted March 5, 2015 What thermostat are you using? At 40c I would have thought a 76c would be about right. Give it a flush out when you change the coolant. Quote Link to post Share on other sites
TR674 Posted March 7, 2015 Author Report Share Posted March 7, 2015 I'm not sure on the thermostat specs, no issues there. I was just curious about the odd behavior, as I had not noticed it before. Graze, I'm hopeing the scorchers are over for the summer. You are probably getting all our hot weather.......... Quote Link to post Share on other sites
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