RE: Bentley W12: more power coming

RE: Bentley W12: more power coming

Author
Discussion

inman999

24,852 posts

172 months

Saturday 8th December 2012
quotequote all
Greg_D said:
that sounds like standard durability testing to me, frankly i would expect any modern engine to pass that with ease.

this on the other hand, impressed me

ford ecoboost v6 torture test
http://www.youtube.com/watch?v=seKk4633Heo
It's too difficult to distinguish marketing bullst from fact, they're hardly likely to be independent.

Greg_D

6,542 posts

245 months

Saturday 8th December 2012
quotequote all
Eh, what are you saying, that they used different engines? Quite a bold claim, could you imagine the backlash if they were caught faking something like that, the collateral damage would be huge. I believe that it performed as described. It is a very american way of doing things, solid and tough sells trucks over there, not soft touch dashboards that we are so susceptible to in europe

Tartan Pixie

2,207 posts

146 months

Saturday 8th December 2012
quotequote all
The fact that manufacturers have these tests, yet cars still break down means the testing is incomplete.

They should leave the cambelt on too long, get their incompetent nephew to change the spark plugs half way through and put a button in a monkey cage, they're only allowed to change the oil when the monkey presses the button.

In fact, you could probably improve engine reliability quite a bit just by having the oil light come on a bit earlier.

anonymous-user

53 months

Monday 17th December 2012
quotequote all
Ok, i'm a bit late on this one, but i call CUSTARD on the scuff test procedure!


Scuff test: Cold engine revved to rev limiter 100 times within 30 seconds of a -10c cold start?



So, a Bentley V12 engine can get from idle to the rev limiter and back in 300ms can it?? Can it F**k !!!

I think you may be mistaking that for an F1 engine (~40krpm per sec max crank acceleration)


The cold scuff test is actually just a normal start, then straight to WOT peak power rpm. Where the engine is held until the thermostat opens, and then the engine is force chilled and the test repeated until either the piston picks up, or the bores are cream crackered.



Greg_D

6,542 posts

245 months

Tuesday 18th December 2012
quotequote all
Max_Torque said:
Ok, i'm a bit late on this one, but i call CUSTARD on the scuff test procedure!


Scuff test: Cold engine revved to rev limiter 100 times within 30 seconds of a -10c cold start?



So, a Bentley V12 engine can get from idle to the rev limiter and back in 300ms can it?? Can it F**k !!!

I think you may be mistaking that for an F1 engine (~40krpm per sec max crank acceleration)


The cold scuff test is actually just a normal start, then straight to WOT peak power rpm. Where the engine is held until the thermostat opens, and then the engine is force chilled and the test repeated until either the piston picks up, or the bores are cream crackered.
i read it as -10 start, within 30 seconds rev the nuts off it, repeat 100 times (ie a day or so to complete the test)

mrmr96

13,736 posts

203 months

Tuesday 18th December 2012
quotequote all
Max_Torque said:
Ok, i'm a bit late on this one, but i call CUSTARD on the scuff test procedure!


Scuff test: Cold engine revved to rev limiter 100 times within 30 seconds of a -10c cold start?



So, a Bentley V12 engine can get from idle to the rev limiter and back in 300ms can it?? Can it F**k !!!

I think you may be mistaking that for an F1 engine (~40krpm per sec max crank acceleration)


The cold scuff test is actually just a normal start, then straight to WOT peak power rpm. Where the engine is held until the thermostat opens, and then the engine is force chilled and the test repeated until either the piston picks up, or the bores are cream crackered.
Yes, it should have been written more clearly as: "Cold engine revved to rev limiter within 30 seconds of a -10c cold start, 100 times"

Captain Muppet

8,540 posts

264 months

Tuesday 18th December 2012
quotequote all
Max_Torque said:
The cold scuff test is actually just a normal start, then straight to WOT peak power rpm. Where the engine is held until the thermostat opens, and then the engine is force chilled and the test repeated until either the piston picks up, or the bores are cream crackered.
No one tests to distruction, you test to the target then inspect the engine. If distruction happens the engine isn't production ready.

If you test to destruction you have no idea of how bad wear is at the durability target.

anonymous-user

53 months

Tuesday 18th December 2012
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I test to destruction, although not always on purpose........... ;-)

Bobley

697 posts

148 months

Tuesday 18th December 2012
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I remember running a similar test for Rover 12 years ago. They just took an engine, started it, checked for leaks and then took it to max power for 30 mins. Thats its. I think that was the piston butch test. The only engine which failed was the one where the head had been dropped and the head gasket was leaking oil into the coolant.

Meanwhile, 650 ponies pulling a heavyweight bruiser, I wouldn't want to work in the cooling department at Crewe...just yet.

Edited by Bobley on Tuesday 18th December 21:39