M2RTY
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Registered: 25th May 01
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as above, are the pistons, head, inlet/outlet valves the same size
can full top half be swapped?
cheers
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mike_1.2LS96
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Registered: 23rd Oct 03
Location: Darlington | Mazda 323 1.8 Exec
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Erm no. Different size pistons, head, valves etc totally different.
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M2RTY
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Registered: 25th May 01
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thank u 
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mike_1.2LS96
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Registered: 23rd Oct 03
Location: Darlington | Mazda 323 1.8 Exec
User status: Offline
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Doubt you could swap the heads, cos the hi torq is a distributorless one the 1.2 has a distributor. If you got a non- hi torq, it would be tricky to put the head w/ manifolds on the 1.2 even though, everything would connect to it (same type of plugs etc).
When I get my 1.2 gasket off, I'll compare to the 1.4 one and let you know.
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Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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wot BHP is the 1.4?
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M2RTY
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Registered: 25th May 01
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65?
just needed 2 know as my 1.2 head i have spare is better condition then the 1.4 on it
i assume its hi torque. thought all1.4 8v spi were called that no?
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Adam-D
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Registered: 11th May 02
Location: Cheshire
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i have a whole 1.4 hi torq engine f/s and gear box ecu loom etc
u2u me if you want it
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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you can put the 1.2 head on the 1.4. loads of posts about this on migweb.
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corsa starter
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Registered: 20th Jan 03
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they are 60 break mate.... got one
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mike_1.2LS96
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Registered: 23rd Oct 03
Location: Darlington | Mazda 323 1.8 Exec
User status: Offline
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quote:
Originally posted by Kris TD
you can put the 1.2 head on the 1.4. loads of posts about this on migweb.
Why? What for?? 
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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changes the compression ratio. also apparently the 1.2 has a better design. been loads of posts on mig, lots of novas have done this.
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PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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quote:
Originally posted by mike_1.2LS96
Doubt you could swap the heads, cos the hi torq is a distributorless one the 1.2 has a distributor. If you got a non- hi torq, it would be tricky to put the head w/ manifolds on the 1.2 even though, everything would connect to it (same type of plugs etc).
When I get my 1.2 gasket off, I'll compare to the 1.4 one and let you know.
Nope, there not all distrobuterless... Mine had a dizzy & was a hi-tork (C14NZ)... It mainly depends on the version of the NZ if it has a dizzy or not (there are 3 different versions of the C14NZ according to vaux, 2 had distrobutors (early models) and the later had a distrobuterless igntion system (newest)).
If it is distrobuterless, you can actually fit a 1.6i head from a Nova on the 1.4 block, as it is pretty much the same just a few differences (believe me I seen it done). Not much of a gain tho bhp wise.
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PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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quote:
Originally posted by Kris TD
changes the compression ratio. also apparently the 1.2 has a better design. been loads of posts on mig, lots of novas have done this.
this is true. vaux were lazy designing the 1.4 head for the SPi's
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mike_1.2LS96
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Registered: 23rd Oct 03
Location: Darlington | Mazda 323 1.8 Exec
User status: Offline
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Shame I have distributor 1.2 and dist-less 1.4 lol. Would have tried that.
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PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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I have the engine loom & ecu for a 1.4 with a distrobutor in the garage somewhere, but has been there for about 10 months!
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mike_1.2LS96
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Registered: 23rd Oct 03
Location: Darlington | Mazda 323 1.8 Exec
User status: Offline
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Hmm, what about using the 1.2 valve section and manifolds, but the 1.4 cam top half?
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James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
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It's not the Spi head you use. It's the 1.2 carb head, and then the 1.3 SR inlet maniofld. but then you need to make sure it's not runngin lean from the increased VE. but the best heads are the MPI head (round port)
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Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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i always though the 1.2 and 1.4 were the same engine just the cylinders were slightly bigger.
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James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
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The SPi's and 1.4 SR heads are the same design (sqaure ports) the 1.2 has slightly small chambers.
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M2RTY
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Registered: 25th May 01
User status: Offline
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so it will fit
both dissy caps?
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James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
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Yesh it will. but use the cam housing from the 1.4 and all it's lifter and rocker etc.. swap them in to the 1.2 head. it will raise compression slightly, but I duobt it anythign to worry about, might even get a slight boost in perf from it, lol
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