Paul_J
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Registered: 6th Jun 02
Location: London
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I know Vauxhaul purposely restricted engines like the 1.4 16v and 1.6 16v on purpose so that it didn't compete with the higher specs (hence you can get a velo's torque tube or whatever to release the power)
but, does anyone think the 1.2 16v is in any way restricted? as to follow the trend and not challenge the 1.4
Just wondering about this because whats the 1.4 unrestricted (with a torque tube or whatever) - 105+ bhp?
the 1.2 is only 200 cc smaller and that'd mean if it isn't restricted at all on purpose its over 30 bhp down on the 1.4??
Doesn't this seem a bit of a large difference of power for 200cc?
I know there are no products for unrestricting the 1.2 16v engine - but still curious to know whether it was limited at all?
Thanks,
Paul J
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chris_uk
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Registered: 8th Jul 03
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doog thought. for the corsa B or C or both
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Rob H
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Registered: 28th Oct 00
Location: Staffordshire Drives: Astra SRi
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if it was restricted, thered be product to un restrict it. the reason its not that powerfull is because thats how it was designed. Stuff like the cam duration/lift, and valve sizes will have been taken into account to produce the desired power output.
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MikeH
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Registered: 3rd Apr 03
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Makes you wonder why they didn't do that for the 1.4 aqnd 1.6 though!
Wish the 1.2 was restricted... coz i have one 
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Paul_J
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Registered: 6th Jun 02
Location: London
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true - but I would of assumed that it might be coz the power / cost ratio would mean the demand would not be v.high thus was never a product to unrestrict it?
Just curious if anyone know's the 2 engines well? wasn't it something to do with the inlet area having another 330 degree's of pipe to go through?
Paul J
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moddedcorsa
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Registered: 15th Aug 02
Location: Argyll, West scotland
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think the 1.2 16v is slow (75 bhp), try the 1.2 8v (45bhp) then u will no what slow is!!
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sxi boy
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Registered: 11th Apr 02
Location: north east Drives: clio 182
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the corsa B 1.2 16v engine is in fact 76bhp, and not 65bhp as vauxhall stated.
vauxhall fiddled the power and 0-60 figures for this engine so it would get a lower insurance group and tax rating.
this was important as this engine in particular was aimed at women and younger drivers to whom insurance would matter most sorta thing.
corsa c 1.2 16v is no faster than the corsa b 1.2 16v
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AdiSRI
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Registered: 1st May 02
Location: Berkshire
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The 1.4 16v / 1.6 16v did have a real dodgy inlet manifold with lots of turns, im gonna get the velos torque tube soon, see what kind of diffo that makes!!
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Adam_B
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Registered: 13th Dec 00
Location: Lancashire
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Doubt it, i think the 1.2 16v is a completley different engine from the 1.4, 1.6 and the 2.0 16v as there all from the xe family. I might be wrong but i dont think u get a 12xe 
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Paul_J
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Registered: 6th Jun 02
Location: London
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Well if the 1.2 16v is unrestricted... then how did they get the 1.4 16v unrestricted to push out 112.5 bhp!
thats a whooping gain of 37.5 bhp for 200 cc!!!!
I'm curious as to whether they did tone the 1.2 16v down too just for the fact that they're market was low insurance and good fuel economy - and thus didn't want it to compete with the 'Sport' model.
Punto's have the sporting 1.2 16v engine that pushes out 85 bhp.
I'm slightly curious to see what people who actually know the internals of the 1.2 16v and 1.4 16v engine could say?
Paul J
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Adam_B
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Registered: 13th Dec 00
Location: Lancashire
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Cylinder head on the 1.4 16v and 16 16v was designed by Lotus and is very very efficent
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Paul_J
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Registered: 6th Jun 02
Location: London
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quote:
Originally posted by Adam_B
Cylinder head on the 1.4 16v and 16 16v was designed by Lotus and is very very efficent
I'm guessing the cylinder head on the 1.2 16v must of been done designed by Mr Blooby then  37.5 bhp difference is bloody crazyness!
You gotta admit it does seem to make sense? vauxhaul make a decent engine for 1.2 16v and then tune it down so it gives good fuel economy and low insurance while still being nippy.
hehe (I can hope) 
Paul J
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WaNtEd_CoRsA
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Registered: 4th Mar 03
Location: Wakefield
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messing with power and 0-60 figures - has nothing to do with tax rating.
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Adam_B
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Registered: 13th Dec 00
Location: Lancashire
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I can just see all the Vaux boffins stood around the first 1.2 16v after testing -
"Aw bollocks weve done it again lads, acordin to this its pushin 140bhp. Pass us some of that rubber tubin, lets knock up another stupid inlet manifold"
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paul_spurrell
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Registered: 14th Sep 01
Location: Bath Avon
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quote:
Originally posted by sxi boy
the corsa B 1.2 16v engine is in fact 76bhp, and not 65bhp as vauxhall stated.
vauxhall fiddled the power and 0-60 figures for this engine so it would get a lower insurance group and tax rating.
this was important as this engine in particular was aimed at women and younger drivers to whom insurance would matter most sorta thing.
corsa c 1.2 16v is no faster than the corsa b 1.2 16v
the 16v engine in the b is different to the 16v engine in the c
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lacky75
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Registered: 8th Dec 02
Location: Norwich
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quote:
Originally posted by WaNtEd_CoRsA
messing with power and 0-60 figures - has nothing to do with tax rating.
it might not make any differance with tax rating? thats to do with the size of the engine, but it sure as hell does affect the insurance there was an article in motorworld recently regarding that subject.
the 1.2 from what im told is only restriced by the fact it has 2 very restrictive cats (catalytic convertors) apparently if u where to replace the manifold (it has 1 of the cats mounted there) for a cat-less manifold and replace the other cat ( for a less retrictive one) then that would free up a nice amount of power!!
but there isnt anything on the market at the moment that allows u to do this.
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sxi boy
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Registered: 11th Apr 02
Location: north east Drives: clio 182
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quote:
Originally posted by paul_spurrell
quote:
Originally posted by sxi boy
the corsa B 1.2 16v engine is in fact 76bhp, and not 65bhp as vauxhall stated.
vauxhall fiddled the power and 0-60 figures for this engine so it would get a lower insurance group and tax rating.
this was important as this engine in particular was aimed at women and younger drivers to whom insurance would matter most sorta thing.
corsa c 1.2 16v is no faster than the corsa b 1.2 16v
the 16v engine in the b is different to the 16v engine in the c
yes they are different but they both push out the same power.
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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quote:
Originally posted by Adam_B
I can just see all the Vaux boffins stood around the first 1.2 16v after testing -
"Aw bollocks weve done it again lads, acordin to this its pushin 140bhp. Pass us some of that rubber tubin, lets knock up another stupid inlet manifold"
actually they didnt cos its a suzuki engine along with the 1.0, the 1.4 and 1.6 are vaux engines.
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matt_jonesuk
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Registered: 27th Feb 03
Location: worcester
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quote:
Originally posted by Adam_B
Cylinder head on the 1.4 16v and 16 16v was designed by Lotus and is very very efficent
was'nt the 1.48 valve head designed by lotus to?
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Tom
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Registered: 3rd Apr 02
Location: Wirral, Merseyside
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tbh the 1.2 16v is never gonna eb quick there is more tuning available for the 1.4 and 1.6 16v's
Altho sayin that i'm currently tuning up my 1.4 mpi 8v, after a 4 branch manifold and decat if anyones got one 
already got full s/s exhaust induction kit (rolleyes: ) and superchip.
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MikeH
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Registered: 3rd Apr 03
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So has anyone actually dyno tested a 1.2 16v corsa B? To see if the vauxhall figures are wrong or not.
I've always felt my 1.2 16v performed better than expected. When i bought it i was resigned to the fact i'd not be overtaking much in it.... but it surprised me allot!
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Thoday
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Registered: 12th Jan 03
Location: Drove kitted corsa b now standard corcs c exclusiv
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hmmm is the 1.0 restricted,, it doesnt seem to move at all much??
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Dan_Corsa
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Registered: 27th Nov 00
Location: preston,Lancashire
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http://www.dbilas-dynamic.de/English/dbilas.html
they make 1 of these inlet manifolds for 1.2 16v aswel giving a claimed 25bhp
[Edited on 13-07-2003 by Dan_Corsa]
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M4tt
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Registered: 18th Apr 03
Location: Potters Bar
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dunno if n e ones said this, didn't see as i skimmed though, but the 1.0 and 1.2 16v were designed by suzuki, where as the 1.4 and 1.6 were built with lotus.
so they have completely different designs. the inlet manifold is the most restrictive element in the 1.4 and 1.6 but it may not be in the 1.0 and 1.2.
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blackula
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Registered: 26th Apr 03
Location: Cheshire
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Well is the Dbilas manifold gives 23 bhp according to he site when you also upgrade the ecu, (price included) then thats conclusive proof the engine in general is 'restricted' from the factory. I mean I drilled my airbox and fed a pipe from the air box 7 inches to the front grille or so and junked the resonator and inlet pipe and it made shed loads of difference, If i drive against my mate in an identical mileage 1.2 sxi I can pull away from...it used to be dead level. And the naysayers told me I'd probably not even got 1 bhp gain, ignorant twats !
I'd guestimate drilling the airbox, revising a cold air feed and K&N element gives about 10 bhp. Otherwise any gain less would never let you pull away.
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