Mole Posted August 7, 2004 Share Posted August 7, 2004 I've noticed that on the rare occasions when I fill up with normal unleaded that the oil temperature (=engine temperature?) seems to be a few degree higher than when running on Optimax. Is there any explanation for this? SV 52 CAT - moles fly - here Link to comment Share on other sites More sharing options...
Myles Posted August 7, 2004 Share Posted August 7, 2004 Could the engine be pinking??? This is more likely with lower octane fuels (isn't it) and causes localised overheating (doesn't it????) Keep BC free and open for ALL. Membership No. 43xx Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Myles Posted August 7, 2004 Share Posted August 7, 2004 Hmm, well, my advice is don't try to search using a phrase based on 'pinking' - look for 'knock' instead. It's the only thing I can think of - assuming that your test conditions are comparable. Variations in air temp can make a big difference to the OT too - on my run up to Scottingland last w/e - starting in warm weather and arriving in the cool evening, the OT dropped quite a few degrees (well, single digits) as the air got cooler even though my pace was pretty much stable. Then again, I did fill up with a variety of fuels on the way Keep BC free and open for ALL. Membership No. 43xx Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Support Team Shaun_E Posted August 7, 2004 Support Team Share Posted August 7, 2004 See here fro some words by Simon Lambert (Caterham aftersales manager). Yellow SL #32 Link to comment Share on other sites More sharing options...
Mole Posted August 7, 2004 Author Share Posted August 7, 2004 I can't put it down to driving conditions or enthusiastic driving - pushing hard on a warm day (e.g. today) I get lower oil temp with optimax than driving more "sedately" in the cool of the evening with normal unleaded. I'm not aware of the engine pinking - it knocks slightly between 1500 and 2000 rpm with either type of fuel - I don't go there very often and of course it's hard to hear over 40 mph ! 😬 SV 52 CAT - moles fly - here Link to comment Share on other sites More sharing options...
dino ferrana Posted August 7, 2004 Share Posted August 7, 2004 Caterham recommend Optimax on track as it keeps temps down. I don't understand why but it does? Link to comment Share on other sites More sharing options...
Mole Posted August 7, 2004 Author Share Posted August 7, 2004 Interesting that it seems to apply under quite "normal" driving conditions as well .... SV 52 CAT - moles fly - here Link to comment Share on other sites More sharing options...
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