moddedcorsa
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Registered: 15th Aug 02
Location: Argyll, West scotland
User status: Offline
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I was looking at a corsa in a scrappy, it was a 1.2 5dr gls, L-reg. and the plastic part that bolts onto the inlet manifold (the thing where the butterfly is, to mix air fuel) is half the size of mine, (on a 1.2 8v c12nz 1997 R-reg breeze)
the plastic thing on mine goes over the rocker cover a wee bit, and the pipe from the airbox goes into a T-piece and the 2 branches go into the box, whereas the l-reg gls theres only 1 pipe from the airbox.
what im wondering is, what difference do the diff design of the above make, and which will give more power or torque?
sorry for the really bad explanation. I would put pics up, but cant find any
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moddedcorsa
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Registered: 15th Aug 02
Location: Argyll, West scotland
User status: Offline
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any 1 got pics of 1.2 engines? so i can point out the difference?
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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Good enough explanation for me mate 
The post 97 1.2 8v's had a larger inlet manifold housing in an attempt to reduce noise + emissions, and improve economy. It kinda acts like an EFi box on a 2.0 16v engine, which helps store ari before it passes into the manifold.
I believe it also has another rocker breather pipe attatched to it, and like u say, the inlet pipe splits in to 2 (the housing towards the front of the engine is more of an "air storage" housing.
There is no difference in the 2 set ups in terms of performance, and between my old L reg 1.2 8v and my mates 98 1.2 8v, i could hardly notice a difference in sound etc. Possibly a smoother drive tho.
Not worth the hassle of changing it mate, might also mess up ECU sensors/set up etc
Matt
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moddedcorsa
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Registered: 15th Aug 02
Location: Argyll, West scotland
User status: Offline
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Ahh right, thanks alot. The explanation was soo bad as i didnt know what the parts were called.
So u reckon that the newer box gives a slightly smoother drive?
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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i believe that this was one of Vauxhall's aims when the c12nz was redeveloped, but the difference is so little. ie: not worth spendin the cash to replace inlet manifold housing + rocker cover + breather hoses etc
Matt
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J100RSA
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Registered: 4th Mar 01
Location: Thornhill, West Yorkshire
User status: Offline
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its a resinator box to quiten induction noise for ec laws
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