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02-08-2008, 04:02 PM
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#1 (permalink)
| | Loyal Member Road burner
Join Date: Dec 2005
Posts: 386
|  How high can a petrol engine rev.
What is the highest revving petrol engine that you know about? I would guess an F1 car but dont know what they go to.
Is it much lower for diesels. What about the LE MANS diesel engines? Why do diesels not rev as high as petrols? | 
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02-08-2008, 04:28 PM
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#2 (permalink)
| | Moderator Torque Junkie Car: Peugeot 406 2.2D
Join Date: Apr 2006 Location: SOUTH EAST
Posts: 2,999
|  Re: How high can a petrol engine rev.
i'D IMAGINE A 2 stroke sports bike with red line over 23,000rpm is the highest revving reciprocating engine.
Turbine engines run up to 250,000rpm.
Diesels reciprocating engines rarely go over 5000rpm due to the compression the require.
Diesel turbines also do 150,000 plus rpm. | |
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04-08-2008, 08:32 AM
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#3 (permalink)
| | Administrator Torque King Car: A3 1.8T Sport
Join Date: Nov 2005 Location: Deal, Kent UK
Posts: 10,725
| Re: How high can a petrol engine rev.
23000 rpm I thought 12,000 in F1 was pretty high. I suppose bike engines are different beasts to cars.
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04-08-2008, 09:49 AM
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#4 (permalink)
| | Moderator Torque Junkie Car: Peugeot 406 2.2D
Join Date: Apr 2006 Location: SOUTH EAST
Posts: 2,999
| Re: How high can a petrol engine rev.
A sports bike is probably little more than 250cc. So there's little reciprocating mass. Hence the silly rpms | |
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04-08-2008, 12:27 PM
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#5 (permalink)
| | Human Version of The Stig Road burner Car: Ford Fiesta Zetec-S
Join Date: Jul 2007 Location: Swansea, Wales
Posts: 464
| Re: How high can a petrol engine rev.
With each year that goes by, cars are getting faster & faster.
The average diesel cars revs to about 5,000 rpm.
The average petrol car revs to about 7,000 rpm.
How do you think these statistics will change in the next 10 years?
Turbochargers and Superchargers as standard on family cars? 
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Some say... (Referring to The Stig)
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His fingernails have 330bhp...
His favourite food is raw meat... | |
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04-08-2008, 08:09 PM
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#6 (permalink)
| | Moderator Torque Junkie Car: Peugeot 406 2.2D
Join Date: Apr 2006 Location: SOUTH EAST
Posts: 2,999
| Re: How high can a petrol engine rev.
You say that bit about forced induction. I think it will become standard. All Saabs are turbocharged, as are lots of Volvos.
VW is also moving this way. | |
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05-08-2008, 07:42 AM
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#7 (permalink)
| | Administrator Torque King Car: A3 1.8T Sport
Join Date: Nov 2005 Location: Deal, Kent UK
Posts: 10,725
| Re: How high can a petrol engine rev.
Its the only way to meet the emissions figures. A NASP engine will only ever be 75% efficient wheras a turbo pushes the output to 150% of the NASP equivalent easily.
The twin charger is a very interesting concept and will no doubt become more widespread.
More efficient = better economy and that is what the makers are chasing. I suspect we will at some point all end up with noiseless electric motors with their massive flat torque curves.
(Then we'll get someone called Lekkymotor-fun joining up the forum and endlessly banging on about how good electric motors have become. And saying how much better they are than diesels  !)
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05-08-2008, 10:00 AM
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#8 (permalink)
| | Moderator Torque Junkie Car: Peugeot 406 2.2D
Join Date: Apr 2006 Location: SOUTH EAST
Posts: 2,999
| Re: How high can a petrol engine rev.
The problem with electricity is storing the stuff. Batteries are heavy. And anyone who solves this problem will wind up dead. Killed secretly either by the British government because of the massive impact that loss of fuel duty revenue will have. Or by the government of oil producing nations because such a breakthrough will render their oil seams WORTHLESS | |
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07-08-2008, 09:08 PM
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#9 (permalink)
| | Member Tuner Car: 750IL 300bhp/450Nm
Join Date: Jul 2008 Location: Carmarthen, Wales
Posts: 73
| Re: How high can a petrol engine rev.
there is a compound available that can absorb HUGE amounts of hydrogen in a tiny space, and very safely, the problem is that when the hydrogen comes back out it does so with such vigor that it is dangerous - but im sure they will fix that soon. any we already have the technology to make electricty from hydrogen (look up hydrogen fuel cell) im not talking about all that run your car on water stuff. | |
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08-08-2008, 05:51 AM
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#10 (permalink)
| | Administrator Torque King Car: A3 1.8T Sport
Join Date: Nov 2005 Location: Deal, Kent UK
Posts: 10,725
| Re: How high can a petrol engine rev.
Ive read interesting things on the fuel cells. It will be interesting to see what they come up with.
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I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint! | |
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08-08-2008, 08:51 AM
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#11 (permalink)
| | Moderator Torque Junkie Car: Peugeot 406 2.2D
Join Date: Apr 2006 Location: SOUTH EAST
Posts: 2,999
| Re: How high can a petrol engine rev.
No one's going to rush any alternative fuel. Last thing the govt. wants is to lose revenue from fuel duty. | |
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08-08-2008, 11:01 AM
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#12 (permalink)
| | Member Wrench Pro Car: 1.25 Mk 4 Fiesta
Join Date: Aug 2008 Location: Newcastle/Leicester
Posts: 32
| Re: How high can a petrol engine rev.
even if they did im sure they would find some sort of alternative tax to bleed us dry as usual | |
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08-08-2008, 05:36 PM
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#13 (permalink)
| | Moderator Torque Junkie Car: Peugeot 406 2.2D
Join Date: Apr 2006 Location: SOUTH EAST
Posts: 2,999
| Re: How high can a petrol engine rev.
Of course they would. Let's face it - there's a very important skirmish in Afghanistan to fund | |
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08-08-2008, 05:43 PM
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#14 (permalink)
| | Super Moderator Torque Junkie Car: VW Bora (184.6bhp)
Join Date: Jul 2007 Location: Lockerbie, SW Scotland
Posts: 3,930
| Re: How high can a petrol engine rev.
But is that not going to pay for itself through all the oil weregoing to get. Sorry this is going to turn very political if we stick to it. better get back on topic.
How high and engine can rev depends on alot of factors,
bore, stroke, compression ratio, fuel, block material. are just some
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08-08-2008, 06:49 PM
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#15 (permalink)
| | Moderator Torque Junkie Car: Peugeot 406 2.2D
Join Date: Apr 2006 Location: SOUTH EAST
Posts: 2,999
| Re: How high can a petrol engine rev.
Balance is critical. Theoretically a straight six has the best primary and secondary balance, but its length means that you can get torsional stresses in the crankshaft.
Valves can bounce if engines are revved too high. Double valve springs help overcome this as the two springs have different resonant frequencies.
Breathing, too. If you cant get enough air in then it won't rev. And you have to get the fuel in to match the airflow. Apparently the 1984 Sierra Cosworth had two whole injector rails (ie. 8 injectors for 4 cylinders). In road tune the second set never came into action but it maybe explains why some of these vehicles could sling out over 500bhp. | |
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