b4l
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Registered: 7th Feb 06
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As far as I know most/all vaux engines have the arrangement above
Wouldnt the engine perform much better if it was rotated 180 degrees
So the manifold is at the back, and the air intake is at the front grille. As it is now the air has to enter the intake filter then come back on itself to get into the cylinders.
Same situation with the exhaust, it has to exit the cylinders then go through two 90degree bends till it can escape.
If it was turned 180 degrees the engine would be "straight through" If that makes any sense.
Im not an engine expert but maybe someone can explain this to me.
Is there a reason the engine is mounted this way? or is it just far too much hassle to mount it the other way
anyways cheers for any input
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Steve X16XE
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Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
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My Astra's engine is the other way round (Y20DTH)
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b4l
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Registered: 7th Feb 06
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yeah maybe I generalised a bit too much by saying "vaux engines"
but you see my point?
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Steve X16XE
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Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
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Kind of. Alot of frence (well older) cars are the other way round.
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M2RTY
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Registered: 25th May 01
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arnt heads sometimes reversed for this reason?
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Ryan_G1
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Registered: 29th Aug 05
Location: East Ayrshire
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The touring cars had revese heads
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Nic Barnes
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Registered: 5th Apr 04
Location: nowhere near ginger people
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i dont believe the reverse head 20xe in the touring car made much of a difference to the power it produced. you still have air flow issues with air having to pass through radiator fan and grill space etc.
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Marshall
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Registered: 10th Nov 05
Location: Boston, Lincs Drives: 1.4 Sport & 2.2 astra
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cooling of the exhaust manifold is probably more important on standard cars, which can be stood in traffic for ages. this is less important on a touring car with a superior cooling system and its moving all the time.
Also the std layout is safer for front end crashes, with fuel rails and stuff to worry about.
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Nic Barnes
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Registered: 5th Apr 04
Location: nowhere near ginger people
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imnagine 5 reverse gears aswell
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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2.2 Astras, Vectras, Signums and Zafiras have the engine the other way round.
Turning the head on the touring car 20XEs gained about 4bhp, well worth it for about 10 grand 
[Edited on 27-05-2007 by Robin]
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Carl
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Registered: 9th May 04
Location: Jimmy Bennett's la la land.
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quote:
Originally posted by Robin
2.2 Astras, Vectras, Signums and Zafiras have the engine the other way round.
Turning the head on the touring car 20XEs gained about 4bhp, well worth it for about 10 grand
[Edited on 27-05-2007 by Robin]
4 bhp is 4 bhp at the end of the day, 10k is nothing to a proper touring car team.
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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It would have cost them more than 10k to develop, that's about what it'd cost to buy one from Swindon now they have the cast for one 
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Rob H
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Registered: 28th Oct 00
Location: Staffordshire Drives: Astra SRi
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quote:
Originally posted by Marshall
cooling of the exhaust manifold is probably more important on standard cars, which can be stood in traffic for ages.
It's actually the opposite, you want the exhaust gases as hot a spossible really to keep the Cat working effectively.
Quite a good question really though, as by swaping them round, you can theoretically drop the engine down a bit more and improve the cars Centre of gravity so it'll handle beter.
Can only imagine it's related to cost (less pipework, wiring etc to do it at the rear), as mentioned above crash damage, not only having petrol lines at the front, but an inlet manifold is usually more complex than an exhaust manifold, so more likely to inflict damage. Might also be issues with heat entering the cabin, possibly even noise issues with it being closer  .
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STEvieXE
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Registered: 21st Jan 03
Location: Ballymena N.I.
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i like the look of them the way they are, (altho thats not really important)
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davey_jack
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Registered: 28th Jan 06
Location: Horley, Surrey Drives: Clio 182
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Ford puma's have it the other way around, to be honest there is not all that many gains to be made by locating the inlet at the front.
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Reedy
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Registered: 11th Apr 04
Location: Hammersmith
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The valver has it the otherway round, when i first saw it, i was alittle confused
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