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On that photo manchild, they are deifinely 2 types of sensor. If you are going to vent anything into the exhaust, then you would use a reasonably large pipe. Those sensors have wires of no more than 10mm, which is far too narrow for any sort of effective evacuation. If I was to guess at what those sensors are for, one is definitely temperature, I guess the other one could be temperature too (measuring temp. at different points in the exhaust?) but it's more likely to be a lambda sensor.

Just a quick question, does anyone know whether F1 teams have pressure sensors in the exhaust? I would have thought they might find studying the pressure waves advantageous for engine development.

I never suggested that they are for “venting” something into exhaust since I know that such things are forbidden by FIA reg.

Yeah sorry manchild I just re-read my post and it came across a little aggressive, I didn't mean to imply that you said there was venting.

my apologies.

No need for apologies.

Perhaps the misunderstanding occurred because some sensors are indeed pipes filled with special fluid with probes on their ends while the others sensors are connected with wires to readout device. They both may look like pipes… from a distance and on low res photos.

if the exhaust is longer...then more hot air will be trapped in it...try to place the engine as close as possible to the gearbox...so hot air will be released more easily

Fundamentally true, but there are advantages to having a four into one collector system. Tuned with the correct length tubes, it does wonders in scavenging the exhaust. So it's to the engineers' advantage to have a tube of a certain length, going into a four into one collector. Of course, the present systems are a complex bend of pipes, terminating usually on the top of the sidepods. It's just a question where the aero requirements make this the optimum location.

manchild wrote:Blue smoke in first laps is probably just the result of engine being pushed hard without reaching full racing temperature.

Several years ago on one Mclaren in Monaco sensor malfunctioned and signaled that oil pump isn’t working properly so the computer turned on backup oil pump and messed things up (the blue smoke was coming out of the engine as it overflowed with oil since both of the pumps were working at the same time. Fortunately, back than remote engine management was allowed and crew from the pit managed to shout down the backup pump...

Do you mean that in the begining of the race we have unburnt gas coming out of the exhaust because the engine is not in the proper temperature (incomplete combustion)? Or that must be the result of friction of the rings agains the cylinder wall (I don't think so)? Or that when the engine is cold, the piston rings are not able to block the oil from coming up to the combustion chamber?

If oil smoke is blue, what's that white smoke coming out of Sato's Engine when he "exploded" it (mainly in 2004)?