F1: Exhaust Blow Ban To Cost Red Bull Dearly? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 06-08-2011, 11:27 PM Thread Starter
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F1: Exhaust Blow Ban To Cost Red Bull Dearly?

FORMULA ONE - F1: Exhaust Blow Ban To Cost Red Bull Dearly?

Written by: SPEED Staff / GMM
Date: 06/07/2011 - 11:36 AM
Location: GMM Newswire

Dominant team Red Bull stands to lose a chunk of laptime if diffuser exhaust blowing is banned after Sunday’s Canadian Grand Prix.

The team’s engine supplier Renault argued for a delay of the ban until after Montreal on the grounds that, because of the basic architecture of the engine, it is a reliability issue.

Adrian Newey explained in Monaco that the Renault V8 opens to full throttle when the driver is not pressing on the accelerator due to “exhaust valve cooling.”

Reliability aside, Germany’s Auto Motor und Sport and Autosprint in Italy claim that the driveability of the Renault engine will also be badly affected by the exhaust blowing ban.

The reports say the 2.4 liter Renault was designed specifically to produce an aerodynamic effect off-throttle, while others have struggled to adapt.

“We lost several engines testing this,” confirms Mercedes’ Norbert Haug.

Auto Motor und Sport estimates the total ban of exhaust blowing will cost some Renault and also Ferrari-powered teams as much as eight tenths per lap.

FIA president Jean Todt is resolute: “It (exhaust blowing) is a pointless consumption of fuel.”

Auto Motor und Sport said the Renault engine is designed to be at open throttle when not accelerating, with Ferrari also at risk of reliability and driveability problems in the event of the ban.

Specifically, Ferrari argues that is opens the valves in that situation to reduce pressure in the crankcase, while Mercedes and Cosworth have an entirely different approach to their valve philosophy.
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post #2 of 3 (permalink) Old 06-09-2011, 05:54 AM
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I'm curious to see how much is it going to affect RBR once the ban is on! So many people like to speculate and throw numbers out there but it never materializes. On the other hand I do see the blown diffuser as zero reference to automotive development.
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post #3 of 3 (permalink) Old 06-09-2011, 01:43 PM
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I'm wondering how much this all has to do with engine braking than it does with aero advantage. BMW was the first (I suspect, listening to their exhaust note) back four or so years ago to futz with exhaust gasses on deceleration. I surmise they may be altering exhaust valve timing during the run down on decel to create compression during some portion of the exhaust stroke to provide additional deceleration of the car. I could be waay off base but ever since listening to the BMWs during the 2007 season there clearly was something going on and it wasn't aero related. Since then more and more teams are generating the very distinctive change in exhaust note on decel.

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