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Thread: 3.2 V6 - How Many Sparks Per Rev

  1. #1
    Regular Member marcdale's Avatar
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    Default 3.2 V6 - How Many Sparks Per Rev

    Hello!

    Just messing around with my LPG system and came across some settings for ignition types.

    Can any one tell me for definate if the ignition system on the 3.2 V6 Petrol sparks once or twice per rev?

    It will help me get the correct ignition timing for my gas system.

    Thanks

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    Full Member Big Sig's Avatar
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    I would have thought that for one rev of the engine it sparks 6 times - once for each cylinder?
    Now I need a turbo to keep up!

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    Regular Member marcdale's Avatar
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    I see where you're going, but I meant per cylinder. I should have made that clear, sorry. Some coil packs fire twice per rev per cylinder, probably to ensure good spark or burn any left over fuel, who knows. It probably happens so quick it would like one spark anyway.

    Anyone got a haynes that might tell us? Any one on here who really know their stuff when it comes to ignition systems?

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    Regular Member Vauxhall Thru & Thru's Avatar
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    Quote Originally Posted by marcdale View Post
    I see where you're going, but I meant per cylinder. I should have made that clear, sorry. Some coil packs fire twice per rev per cylinder, probably to ensure good spark or burn any left over fuel, who knows. It probably happens so quick it would like one spark anyway.

    Anyone got a haynes that might tell us? Any one on here who really know their stuff when it comes to ignition systems?
    I don't know categorically, but I would say once per rev. Sparking twice would reduce the life of the units, and I doubt that Vauxhall would design it this way?
    Maybe one of the gurus can help?

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    A four stroke engine only sparks once every two revs. The camshaft only rotates at half engine speed, hence when doing the cambelt you rotate the crankshaft twice to match up the timing marks on the camshaft when checking. Remember suck, squeeze, bang, exhaust - four strokes.

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    Vehicle : Vectra C Hatch

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    It's true that you only need one 'bang' in your suck, squeeze, bang, blow cycle per cylinder but many engines have a 'wasted spark' setup. For ease of manufacture and design they spark at the top of each stoke but at the top of the exhaust stroke it has no effect and is therefore 'wasted'.

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    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : 3.2 V6

    Year : 04

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    Default

    As said above..From what I understand too. They spark Twice. Once to ignite the fuel and a "wasted spark"( I don,t think it is as strong as the ignition spark) to ensure all the fuel is burnt before it is sent into the exhaust ( unburnt fuel will damage the cat).

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    Regular Member marcdale's Avatar
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    Default Thanks VXVirgin and Ed Taylor

    I thought this might be the case. I know the obvious answer being 1 spark = 1 bang but with modern ignition systems there's a lot more to it.

    I also understand that modern fuel systems can some times open the injector twice per rev per cycle as well. Once for the bang you expect, the other is sometimes used for extra cleaning or lubrication and some times it use in conjuction with butterfly valves on the intake to 'pre' deliver a small amount of extra fuel to the cylinder in time for the proper amount of fuel arriving at the correct time in order to give you extra power.

    I certainly see this on the V6 petrol, you get to a point in the rev range and then there's a kick and it's got an immediate increase in power. This is most likely helped with the mentioned extra injection of fuel at the point the intakes spring open fully.

    Things aren't as simple as they used to be!

    Thanks anyway!

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    Regular Member Ste's Avatar
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    Default

    The only people to truly know how many sparks per power stroke would be the product engineers for the FIE.

    Modern diesel can do 5 injection events per power stroke, but most only do 3 - Pilot to warm, Main charge, and post to clean things up.

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    The 2.5 and 3.0 V6's in the Omega definately use the wasted spark system...as the 2.6 and 3.2 are developments of these I think it's highly likely they do the same.

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