Engine bay temperature
Discussion
I have just replaced the radiator fans with Pacet PF1011P so had fans to spare. I've tried and failed to find any position for them down around the gearbox tail (fan diameter is too large) so have now fitted one of them between the side grill and the oil cooler blowing outwards.
A number of owners have mentioned the engine bay temperature but no mention of how this was measured.
What form of instrumentation should I find?
Steve
A number of owners have mentioned the engine bay temperature but no mention of how this was measured.
What form of instrumentation should I find?
Steve
hi steve ,i bought a clock and temp sensor from halfods it is a nice digital device that comes with a sensor with a longish lead ,i fitted the gauge on the ally plate on the inside of the passenger foot well and ran the temp probe through side pod and into engine bay currently it is mounted as high up as possible but there is enough lead to put it all over the bay ,been out today and had temps upto 60 degrees under the rear clip when in traffic !!!!!! simon
That sounds like just the job. Nearly completed the instal of the side pod fan but decided it needs it's own relay so have come to a stop so a visit to Halfords was on the cards anyway.
I'm out with it tomorrow with lots of stops and starts so will see how the new rad fans work.
Steve
I'm out with it tomorrow with lots of stops and starts so will see how the new rad fans work.
Steve
The MS uses a simple sum based on the ideal gas law. Should be good for any temp from -70 to 180°C. According to my maths that will mean it was running at about 81% of the amount of fuel it would use with 25°C intake air. Been away doing a bit of background reading and it seems that the sum may be a bit on the simple side particularly with turbos. Having carefully tuned the idle when hot I may now have difficulty when idling with cooler air. It's all part of the fun I guess...
steve_d said:
I have just replaced the radiator fans with Pacet PF1011P so had fans to spare. I've tried and failed to find any position for them down around the gearbox tail (fan diameter is too large) so have now fitted one of them between the side grill and the oil cooler blowing outwards.
A number of owners have mentioned the engine bay temperature but no mention of how this was measured.
What form of instrumentation should I find?
Steve
A number of owners have mentioned the engine bay temperature but no mention of how this was measured.
What form of instrumentation should I find?
Steve
Steve, as you know ive stuck a fan in the same position, mine draws air
in rather than blowing outwards and works very well
Keith
I have heard a few things about the MegaSquirt calcs, but they are based on a standard air density formula so should be okayish. But 93DecC is very hot for a normally aspirated engine, I once saw 65DegC intake on my carb setup last year when sitting still but never any higher.
With my new flat panel filter and rear clip housing I see ambient when moving, but still get heatsoak when still. I hope to solve this with better sealing between the air filter holder and the fibreglass housing.
As for the fan, I have a pull fan mounted on the oil cooler, so it pulls air through it from the side pod into the engine bay. What this then does is cool the oil well but blow preheated air into the engine bay. This then serves to heat the intake air unless you duct it in from somewhere else. I put the fan on the oil cooler for piece of mind but don't think it is really all that necessary. It would be better used pulling air from the engine bay; it has even been suggested that it would be better to make it a push setup, ie, pulling engine bay air though the cooler and out of the side pod!
In general I think we get hung up on the under clip temmperature, providing your intake air is a good (read ambient) temperature I think everything else around the engine should survive a little 'warming', any electronics should be keep as low as possible (including the alternator) where it will naturally be cooler.
With my new flat panel filter and rear clip housing I see ambient when moving, but still get heatsoak when still. I hope to solve this with better sealing between the air filter holder and the fibreglass housing.
As for the fan, I have a pull fan mounted on the oil cooler, so it pulls air through it from the side pod into the engine bay. What this then does is cool the oil well but blow preheated air into the engine bay. This then serves to heat the intake air unless you duct it in from somewhere else. I put the fan on the oil cooler for piece of mind but don't think it is really all that necessary. It would be better used pulling air from the engine bay; it has even been suggested that it would be better to make it a push setup, ie, pulling engine bay air though the cooler and out of the side pod!
In general I think we get hung up on the under clip temmperature, providing your intake air is a good (read ambient) temperature I think everything else around the engine should survive a little 'warming', any electronics should be keep as low as possible (including the alternator) where it will naturally be cooler.
had a look at the ecu map to see how it changes upto 50degrees there is no change but 60degrees there is -2%fuel and -2d ignition and at 70degrees inlet temp there is a reduction off -4% fuel and -6d ignition raising to -10% fuel and -10d ignition at 80degrees air inlet temp ,no wonder it feels a bit flat with high inlet temps -10 degrees ignition at 4000 rpm means it is only running 13 degrees of advance at W.O.T. not much !!!.simon
bluesatin said:
tuxman
Fit a couple of knock sensors and let the advance run of that! Closed loop lambda will do the fueling.
Fit a couple of knock sensors and let the advance run of that! Closed loop lambda will do the fueling.
I agree with running closed loop for the fuel with AFR sensor but better to map the ignition correctly and use a knock sensor to only help when things get a bit hotter than they should. I have one fitted in my setup but I don't want to rely on it to get the best advance.
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