Question about horse power

[JonT]

I've been looking at cars recently and the seemingly low hp listed on them confuses me.

My current bike (sv650) currently makes 33 because its restricted, but could normally do about 68. This is from a 650cc vtwin engine.

A 4 cylinder 1200cc petrol engine in a car might produce 60hp. Surely making so little HP and weighing so much it should crawl along?

A 1000cc motorcycle 4cylinder engine might produce 170ish though...

Is there any means of comparing the two?

[alone]

Slightly uninformed also.. But cars produce a lot more torque (generally), and that's what actually pulls the weight along..
A lot of it also comes down to gearing.

Something thats always got me (and might be answered here) is how one of my bikes is a 650, and makes only 50odd BHP,, yet the other is a 750, and makes 90odd (well, used to, 18yrs ago!).. That's quite a difference. Why? Why not have my BMW making 70/80 odd, and keep in fashion with the 750...

Figures are just guesses, btw!
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[Jamie S]

I know our 1.6 Astra sport is 200BHP and our 250 yammy is about 30bhp

[NSR Mick]

[Jamie S]

Omg if you want me to prove it i will scan the manual.

[NSR Mick]

[Jamie S]

will do it when i go to my other house mate. not a problem at all i know i can back up that it is 200bhp. and tbh i dont even see why you dont belive me, its a 05 not one of the shitty old ones

[NSR Mick]

A production 1.6 pushing 200bhp? I dont think so.

That's what 1.8 - 2.0 turbo's put out and the astra 1.6 isn't a turbo is it?
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[NSR Mick]

I've just had a look at the figures and it's actually 104bhp https://www.smileyhut.com/laughing/roflmao3.gif
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[Jamie S]

thats not for the Irmscher model tho which is the one we have got.

[Dave McCool]

[Jamie S]

one there is a standard car all be it the newer model than ours but thats just proveing that they are more than capable of 200bhp

https://www.grimshaws.co.uk/vauxhall_dealers/astra_VXR.htm
And 2 yes it is a factory car they go straight from vauxhaull to them then from them to you (or us in this case )
Costs a bit to have done but its worth it.

[Dave McCool]

[Jamie S]

no i am not saying thats the smae car as ours as ours is the version before that.

[Dave McCool]

And I'm saying an Irmscher grille will not give an N.A. 1.6 over 200 horsepower.

I'm also saying there was never an "Irmscher Version" of the Astra.

Unless you prove to me otherwise.
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[Jamie S]

I will find the site were we had it done after i have had some sleep,
But thanks for getting me 75 posts in on night ill soon have 500 ! i only had like 400 when i came online

[Dave McCool]

[Jamie S]

why am i ?

[Jazoli]

LOL at the above, just had a look in the handbook of my car, ooooh, it makes 500hp........oh no, hang on, thats for the M5 not the 525.....doh!

Fact, astra 1.6's make 104bhp, 2.0L turbos makes 200bhp, I know, I used to sell them, Irmscher only produce bolt on tat for them, if anything the stuff slows the cars down!


Back on topic, bikes produce more power than cars capacity wise as they rev a lot higher, cars need torque to get them moving, peak torque in a bike engine is about where most cars hit the rev limiter, also bikes weigh feck all in comparison.
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[Wafer_Thin_Ham]

Owned.
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[Bendy]

A lot of the available power (of anything powerful) isn't being used a lot of the time - remember the Veyron cruising on the motorway using 50 of it's 1001 horsepower?

Bikes, in general, have a gratuitous excess of power that's there purely for having fun with. Family hatchbacks don't.

Comparatively, they *do* crawl along.

[beatnck]

ive always thought the reasoning was that bike engines are more highly tuned than car engines - just look at the service intervals between the average family car and a bike. Granted, some cars do make a lot of bhp for their capacity - i had a tuned mi16 powered 205 gti that kicked out 200 bhp, but it cost a lot of money to build and required frequent and expensive services

[Phil_G]

Irmscher did used to make tuning products.

When I ran a Nova, it had a Twin 40'd 1.6 litre motor and the carburettors were on an Irmscher Manifold. To be honest though, I *think* that they were original Nova sport carbs which would date them to 1985 (or thereabouts).


I also had this discussion with many bike salesmen who were telling me that the ER/GS 500s were "dreadfully slow". I simply pointed out that there is no way I could class them as slow when I have the same amount of horsepower in my peugeot which is about 5 times the weight of the above bikes.
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[cestrian]

Compare the Bandit 650 and the Sv650.

The four cylinder Bandit 650 produces 77HP at 10,100 RPM and 59.2Nm of torque at 4000 RPM.
The Two cylinder SV650 produces 72HP at 9000 RPM and 84Nm of torque at 7200 RPM.

Both bikes are almost the same cubic capacity but the V-twin produces alot more torque. This is because each cylinder of the SV650 is twice the capacity (325cc) of a Bandit cylinder (162.5cc). The bigger 'bang' (created in the cylinder when the fuel/air mixture is ignited by the spark plug) pushes the piston down the tube with more force, thus producing a greater 'turning force' (more torque) at the crankshaft.

My little Hyundai Getz is 1100cc and only produces a piss poor 49BHP at 5500 RPM, yet 99Nm of torque at 3200 RPM.

So, bigger cylinders produce more torque at slower RPM's, and torque is what gives engines 'pulling power' at low running speeds. Generally, motorbikes need much higher revs to produce the same amount of horsepower as a car.

Hope this helps.

[0ddball]