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Old 13 Nov 2008, 21:11   #1
Zico
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What N/A engine has best power/weight ratio?

Hoping you hillclimb guys can answer this..

Had a discussion with a friend of mine who reckons rotary engines provide the best power to weight ratio of all naturally aspirated powerplants while Im thinking the 90KG Hayabusa derived Hartley V8 with over 400bhp must be right up there. The amazing DP1 uses this powerplant.. see http://www.dpcars.net/dp1/index.htm

There must be other engines also, please educate me..

Cheers,
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Old 13 Nov 2008, 21:34   #2
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Certainly not my 1500 spitfire engine mores the pity.
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Old 13 Nov 2008, 21:52   #3
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Mike_Wooshy should be qualifying in the top 10 on the gridMike_Wooshy should be qualifying in the top 10 on the grid
Aside from Motorbike and special Engines (2.4 supercharged V8 in the Caterham lavante(sp?) etc etc) usual 4 pot engines, The Rover K-series, Ford Sigma and Ford Duratec (Mazda MZR) are all very light (around 100 kg) with reasonable scope for power.
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Old 14 Nov 2008, 08:06   #4
DaveK
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Assuming you mean any engine, then you are into the realms of F1 V8 engine @ approx 100 kgs and 800 bhp or the Moto Gp 990cc engine which i figures must only weight 50 kgs and produced approx 260bhp.
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Old 14 Nov 2008, 14:32   #5
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How about the Novarossi Plus12-5SCT. Weighs 225g and throws out 1.7bhp (do the math!), Peak RPM is over 45000 RPM

http://www.novarossi.com/content_uk/...lus12-5sct.htm
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Old 14 Nov 2008, 15:51   #6
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Originally Posted by DaveK
Assuming you mean any engine, then you are into the realms of F1 V8 engine @ approx 100 kgs and 800 bhp or the Moto Gp 990cc engine which i figures must only weight 50 kgs and produced approx 260bhp.
Dave's probably right. Although one or several of the <2007 F1 V10's probably went over the 1000bhp per 100kg mark.

One thing hillclimbing has proved time and time again, is that brute power to weight is academic if the way the engine delivers the power, or the logistics of it's design (low c of g, it's installation, the gearbox needed to transmit the power) is wrong for the application.

Mr Wight, who posts on here can attest to that. A few years ago he bought an ex DTM Opel/Cosworth 2.6 V6 into the sport. The combination of a lighter nimbler chassis with a more "drivable" engine compared to the 4.0l V8 brutes that were popular at the time, wiped the floor with everybody and reset the standards of the sport. True, eventually, higher BHP won the day. But not before the point was emphatically made.
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Old 14 Nov 2008, 22:52   #7
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Originally Posted by DaveK
the Moto Gp 990cc engine which i figures must only weight 50 kgs and produced approx 260bhp.

That includes the gearbox too though doesn't it?
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Old 14 Nov 2008, 23:25   #8
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Originally Posted by b1ackcr0w
How about the Novarossi Plus12-5SCT. Weighs 225g and throws out 1.7bhp (do the math!), Peak RPM is over 45000 RPM

http://www.novarossi.com/content_uk/...lus12-5sct.htm

You can't exactly power a Caterfield with one though.
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Old 15 Nov 2008, 00:11   #9
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IIRC Juniors V10 weighs about 85kg (from what I can remember being told) and can produce in excess of 750bhp so that scores quite high on the list I suspect..
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Old 15 Nov 2008, 08:15   #10
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Originally Posted by rescue dude
You can't exactly power a Caterfield with one though.
But you could use it to spin up a turbocharger!
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Old 17 Nov 2008, 15:43   #11
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Swiss Auto 500cc Two Stroke used in solo motorcycle and sidecar racing 200 bhp on a good day 39 kgs including gearbox
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Old 17 Nov 2008, 20:22   #12
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Oh I rememebr that Swissauto thing, I think if I rememebr Rolf Biland the sidecar ace of years developed it to replace the inline 4 sidecar engines.

The engine was also used later on in a 500 2 wheeler by MZ, was very powerful and quick but had a real harsh power delivery

What a lot of people dont know is that Swissauto develoepd a 250 turbo 2 stroke before this in teh 80's.

Now imaguine that in the wet, tiny powerband and a turbo!! These guys are nuts!
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Old 18 Nov 2008, 07:40   #13
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If you want extreme two stroke power then start googling Snowmobile Drag racing also some American race series allow two stroke engines .I quite like the idea of a 2 litre v8 Two stroke hillclimber but don't have the funds to get it done anytime soon and if Juniors electric car is successful everything else will be obsolete .
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Old 18 Nov 2008, 08:35   #14
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Originally Posted by Jedi088
I quite like the idea of a 2 litre v8 Two stroke hillclimber but don't have the funds to get it done anytime soon and if Juniors electric car is successful everything else will be obsolete .
Worry not! The Watt 4 will come unstuck on the longer courses as they can only use 1000 yards of cable!

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Old 19 Nov 2008, 15:42   #15
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Worry not! The Watt 4 will come unstuck on the longer courses as they can only use 1000 yards of cable!

He'll have no problem stopping at "The World Famous" then.
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