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TOPIC: V8 or V4

V8 or V4 7 years 8 months ago #29667

  • S0lo
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This guy keeps telling me that the newer v8 BMW engines have this economy feature that when at low speeds works on 4 cylinders and when it runs at more than 80Km/h it works full capacity on 8 cylinders!!!

He knows a bit about cars, but I just can't get this into my head. How in the world would an engine do that without the driver feeling any thing at all, not to mention other technical difficulties. Did any one hear any thing about that? I couldn't find any references about it and he couldn't give me any either.
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Ammar Muqaddas
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Re: V8 or V4 7 years 6 months ago #30359

  • rizin
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Perhaps possible, i had felt the speed difference and performance while driving the different old and new model cars with 4 cylinder capacity. if the difference itself in 4 cylinders Why not with v8 :)

When you drive some new cars you feel the difference comparing to old model 2003 cars Both run on 80 km/hr But there is increased speed in new cars.

Apparently it is not only with volume of cylinders but with other advanced technical methods applied on camshaft and fuel injection etc..

Well Shall we know the brand name of your car :wink: How Would be a Car manfuctured by the brand name FIREWALL :)

Rizin
Known is a drop, unknown is an Ocean
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Re: V8 or V4 7 years 6 months ago #30360

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Thanks for the feedback rizin :), I agree with you on all. But I think I did not explain it really well. This guy is telling me that the SAME V8 car runs at lower speed on only 4 cylinders. In other words, 4 cylinders will be moving and the other 4 are STATIC!!, not moving at all!!, until the car reaches a certain speed, then those static cylinders suddenly start to move, and the car moves on 8 cylinders!!

So under 80Km/h, it's a V4, over 80Km/h the SAME car is a V8!!!

I find this really wild, I can't begin to believe it.
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Ammar Muqaddas
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Re: V8 or V4 7 years 6 months ago #30363

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I find that improbable. All the cylinders are connected to the same crankshaft so they will all be moving. However I suppose it's possible that only four of the eight will be generating power - i.e. undergoing compression and recieving fuel - and the others will be brought on-line when extra output is needed. You could do that with the fuel injection computer. You might get a bit of extra economy that way I suppose, but it sounds like a lot of effort for the return. Unless the engine drives two separate crankshafts that have their output combined in some way then I don't see how it can be done
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Re: V8 or V4 7 years 6 months ago #30367

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You could do that with the fuel injection computer. You might get a bit of extra economy that way I suppose, but it sounds like a lot of effort for the return. Unless the engine drives two separate crankshafts that have their output combined in some way then I don't see how it can be done

Ya, give me more of that TheBishop :). That sounds much more understandable. The "fuel injection computer", hmmm put more fuel here than here. Ya I could buy that 8).

The thing about the "two separate crankshafts" is that (I think) that the driver has to feel a jump or a change in engine tone or something when the transition from 4 to 8 happens. I drive the BMW V8, but I never noticed that. I might be wrong.
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Re: V8 or V4 6 years 5 months ago #34891

  • E_Money
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Your friend is correct. There are also a few trucks in America that have the same function. Dont know why they didnt think of that years ago.

Do they actually make 'v4's in kuwait or do you mean a i4 ( inline )??
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