howdy folks
my van (twin tanked with FPHE) fluctuates between 70/85c, this range in fluctuation is due to the windchill factor (ambient temps/speed of travel/no insulation of FPHE/position in engine bay) etc. ive only done 2000 odd ish miles like this maybe 3000 miles-ish, even at this temp oil maybe alot thinner but the old IP knows its oil as i still get diesel knock / slightly... more noticeable on colder engine.
my car pug 406 has the modified filter housing but to date i have never taken temps for this, chug has and done tests and its been said the fuel sees a 10c rise in temp, everything else standard with the fuel system.
as an 100% veg oil runner, i know hotter runs better and starts alot better!
what i do know about discos and veg running is the disco hate starting in winter with veg oil, they smoke alot with high percentages of oil to diesel ratios, but at 50/50 run very well. one chap said his 300 TDI (is it really an I?) went better on oil with alot more compression and was like having a turbo and could overtake cars very easily...
On the other thread Julian posted "Interesting reading for veg runners ..." the PDF you can't read states:
Oil heating to the temperature of 60 C diminishes its viscosity to 19.5 mm2 sK1 ensuring a
smooth oil flow through the fuel filter and reducing the brake specific energy consumption at light
loads by 11.7–7.4%. Further heating to the temperature of 90 C offers no advantages in terms of
performance.
This does seem to suggest that 60C is a minimum for running veg, and 90C carries no advantage. However, this doesn't help Julian with his hot IP question. I guess when it's up to temp you could douse the IP from a hose and see if cooling it helps with the issue.
