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Author: Subject: F1-style engine revving
millenniumtree

posted on 28/11/06 at 06:58 PM Reply With Quote
F1-style engine revving

How do they get F1 engines to go from idle to redline (and back again) in a fraction of a second?

Is it just super light rotating components combined with massive horsepower and low restriction?

Can something similar be done with a car engine? Or at least can you make this response better without completely destroying your engine?

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DIY Si

posted on 28/11/06 at 07:04 PM Reply With Quote
It's, I think, mainly really light internals and a very, very light flywheel (do they actually have one?). Bike engine rev up really quickly too, albeit not as quick as F1 engines.





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JoelP

posted on 28/11/06 at 07:04 PM Reply With Quote
that is basically what you are trying to achieve when you lighten components. F1 cars take it to an extreme by using exotic alloys, to get light strong parts, hence how fast the revs can change.
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flak monkey

posted on 28/11/06 at 07:05 PM Reply With Quote
If you think F1 engines redline quick you should listen to a top fuel drag car

http://video.google.co.uk/videoplay?docid=-4530549599507663097

(watch it to the end)

[Edited on 28/11/06 by flak monkey]





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BenB

posted on 28/11/06 at 07:11 PM Reply With Quote
Having no flywheel helps....
One reason why bike engined cars seem to rev quicker is their minimal flywheel. The downside is that it makes driving it more difficult (ie easier to stall due to less momentum in the engine parts)....
Ease of driving is why lots of pedestrian tintops (if that's not an oxymoron) take such a long time to "spool up"- my tintop is a Micra- in the time it takes to rev I could have done the same twice with the ST1100 engine!!! It's so fun sitting at traffic lights in the BEC blipping the throttle and watching the tacho wizz all the way round in a blink of an eye....
On a car-enginned-car reducing the flywheel weight through getting it turned down helps to a point. Do it too much, though, and it the engine turns into an expensive grenade.

The lack of mass throughout a F1 car helps the pickup- not just the engine but everything else that has to spin up. Okay okay when you're just blipping the throttle with the clutch down the propshaft doesn't move but you can't win a F1 championship without the car moving ... [drool] Carbon fibre propshafts.... [/drool]...

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James

posted on 28/11/06 at 07:29 PM Reply With Quote
Agreed, having just a clutch attached to the crank instead of a flywheel certainly helps.

Things like the (now banned IIRC) berylium alloy pistons and the like make a big difference too.

I think the attached file give a good example of what can be done.....

In case you're wondering it's the 2005 Renault v10 'playing' that tune!

Can you do this with Megasquirt?

Cheers,
James

[Edited on 28/11/06 by James]





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tks

posted on 28/11/06 at 07:39 PM Reply With Quote
mhhh

Mainly it is due to a very low stroke engine.

The piston speed is then very high.
Revs will be high to.
Torque is low.

F1 engines have low internals combine that with low friction (no cam etc.)

then you get easy reviing

Tks





The above comments are always meant to be from the above persons perspective.

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bilbo

posted on 28/11/06 at 07:50 PM Reply With Quote
quote:
Originally posted by James
Agreed, having just a clutch attached to the crank instead of a flywheel certainly helps.

Things like the (now banned IIRC) berylium alloy pistons and the like make a big difference too.

I think the attached file give a good example of what can be done.....

In case you're wondering it's the 2005 Renault v10 'playing' that tune!

Can you do this with Megasquirt?

Cheers,
James

[Edited on 28/11/06 by James]


Thanks just Great!
Clearly the Renault F1 team have far too much time on there hands

I also liked flak monkeys video. I've never seen engine revs nearly breaking a camcorder before I love the guy on the right grimacing and putting his fingers in his ear, knowing what was going to happen next!

[Edited on 28/11/06 by bilbo]





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russbost

posted on 28/11/06 at 07:50 PM Reply With Quote
No cam?????
Now that would be interesting, but can't recall the last 2 stroke F1 I saw!





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Wadders

posted on 28/11/06 at 07:51 PM Reply With Quote
Jesus, i think i'd be scared to stand so close to that thing never mind being strapped into it. Big cahoonas, much respect.



Originally posted by flak monkey
If you think F1 engines redline quick you should listen to a top fuel drag car

http://video.google.co.uk/videoplay?docid=-4530549599507663097

(watch it to the end)

[Edited on 28/11/06 by flak monkey]

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bebot

posted on 28/11/06 at 08:16 PM Reply With Quote
There's less moving parts, as the valve's are open pnuematically, there's not a lot to impede the crank rotating.
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Peteff

posted on 28/11/06 at 08:23 PM Reply With Quote
Light weight and high compression

Remember there's a downside to the lightening as well, they have to tick over at 5,000rpm and stall at the drop of a hat. That dragster smokes nearly as much as my Pinto





yours, Pete

I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.

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gazza285

posted on 28/11/06 at 08:45 PM Reply With Quote
quote:
Originally posted by bebot
There's less moving parts, as the valve's are open pnuematically, there's not a lot to impede the crank rotating.



Not quite. The valves are still opened by a camshaft and closed using pnuematics instead of steel springs.





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Jebus

posted on 28/11/06 at 09:05 PM Reply With Quote
its a similar idea 2 a desmo ducatti engine, they rev up a lot better than a normal v twin could
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Werner Van Loock

posted on 28/11/06 at 09:06 PM Reply With Quote
Don't F1 engines run on different octane fuel then our regular tin tops?

The Top Fuel dragsters run on nitro-methane, almost explosive!





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yorkshire-engines

posted on 28/11/06 at 09:57 PM Reply With Quote
i was lucky enough to have a drive in a top fuel dragster when i was racing in comp altered during the late 70,s (god was it so long ago)
dave lee travis who was a good friend got me a drive in the radio one sponsored top fueller the needle and it was set to run at half power around 1500 bhp

believe me thats the fastest scariest thing iv ever sat in i s@@t myself and shut the throttle halfway down the strip and still did 187 mph in it

still shudder to this day thinking about it and there a damn sight more powerfull these days

go to santa pod next year to the nationals and see for yourselfs

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flak monkey

posted on 28/11/06 at 10:06 PM Reply With Quote
The top fuellers are putting out 6000-8000bhp now and run 300mph+ 1/4s. There is no other sound like a top fuel drag car, the only car engine capable of making you physically shake 300 yards away when they rev it.

I think you might have driven a menthanol drag (look like a top fuel), which put out about 3000-4000bhp. Still bloody quick though (250+ 1/4s)





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JoelP

posted on 28/11/06 at 10:14 PM Reply With Quote
quote:
Originally posted by flak monkey
a menthanol drag


isnt that a type of fag?!

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Stuart Walker

posted on 29/11/06 at 10:28 AM Reply With Quote
I read somewhere F1 fuel has be 99% (or maybe 95% - cant quite remember) the same makeup as road fuel, although octane ratings vary slightly in road fuel anyway, but I guess that means it can't be much higher octane...

quote:
Originally posted by Werner Van Loock
Don't F1 engines run on different octane fuel then our regular tin tops?

The Top Fuel dragsters run on nitro-methane, almost explosive!

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tks

posted on 29/11/06 at 10:45 AM Reply With Quote
mhhh

you get me thinking but how do they manage the amount op valve lift then??

I´m quet sure F1 engines don´t have a cam shaft atleast not as BHP consuming as a normal one.. in fact with out the springs everything is said.

the also don´t have throttle butterfly the manage valve lift.

Tks





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jono_misfit

posted on 29/11/06 at 12:45 PM Reply With Quote
Im 100% confident they have camshafts. The valve acutation method is different though.
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