Engine Weights

[loomesy]

Hello,
Im interested to know how much the following engines weigh. This is for a university project, whereby we will be possibly using one of these engines on an integrated type racing hovercraft, so basically the lighter the better. OK here goes
Aprilia 450 V-Twin
Honda vfr400
Honda cbr400
Kawasaki gpz500
Kawasaki ZXR400
Suzuki DRZ400
Suzuki GS500
Yamaha YZ450

If any of you guys have Haynes manuals, i think engine weights are in there.
Thanks for your help. Also any other engine suggestions welcome, up to 500CC
Cheers
Loomesy

[halo123.]

Hi maybe its here
https://www.motorcyclespecs.co.za/

The Haynes i have doesent list the engine weight just the whole bike (gs500)
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Halo123. =Techie/geek and bike rider ,
current bikes owned ,fix me upper gs 500e missing cdi
cbr 250 virgin colours

[Robby]

The aprilia 450 and the two singles listed there should be by far the lightest.
Any of the four cylinder engines will be heaviest.

If you want a decent power/weight ratio you should go for a 2 stroke engine. A fair few of the dirtbike 2 stroke singles have magnesium alloy casings, single carbs, and fairly lightweight gearboxes. I assume you want to junk the gearbox anyway, so you may be better off looking at paramotor engines - 2 stroke, decent specific output, very lightweight.

[G]

I'd expect the Yamaha would be the lightest, followed by the Aprilia, then the DRZ. I'd expect the 400 il4s will all be about the same and the 500 twins the same, but not sure which is heavier out of the two.

As it's for something that won't be tilting much a dry sump maybe an advantage, as the oil can slosh about a bit in a wet sump.

The DRZ has a dry sump I believe, not sure about the others (oil nomrally stored in the frame.)

Reliabilty and servicing is also worth considering - the Aprilia engine probably makes about as much power as any of the others, but is quite expensive to keep running.
I'd be tempted to look at a 250-500cc mx or enduro 2 stroke, as these should be not too heavy and have at least simple maintenance.

[MarJay]

Most of the hovercraft kits I've seen use a TZR250 2MA engine, which is a two stroke, makes about 50bhp and weighs bog all.
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[loomesy]

Cool cheers for the help
Yeh sorry i shouldve mentioned no 2 strokes, which makes it hard to get a comparable amount of performance and weight.
Loomesy