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Author What is required to change.....
L885 1.28v
Member

Registered: 7th Aug 03
Location: Copthorne, Nr Gatwick
User status: Offline
25th Nov 04 at 09:58   View User's Profile U2U Member Reply With Quote

a 1.4 spi to a 1.4 mpi
how much and is it worth it
Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
25th Nov 04 at 09:59   View User's Profile U2U Member Reply With Quote

Fuel pump, injectors, as far as i know.
Siberia
Member

Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
25th Nov 04 at 10:03   View User's Profile U2U Member Reply With Quote

an inlet maybe?
Rileysport
Member

Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
25th Nov 04 at 10:12   View User's Profile U2U Member Reply With Quote

Get full head and manifolds off the mpi, and the pump, fuel connectors etc.

Pistons may be different though
James R
Member

Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
25th Nov 04 at 10:15   View User's Profile U2U Member Reply With Quote

do a search it's been posted millions of time.
There's a lot to it, it's just easier to swap the whole engine.
PaulW
Member

Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
25th Nov 04 at 10:15   View User's Profile U2U Member Reply With Quote

compression ratio of the SPi is lower than the MPi so the pistons are different... the poskets are deeper on the SPi to lower the compression.

SPi - 9.5:1
MPi - 10:1 or around that

[Edited on 25-11-2004 by PaulW]
James R
Member

Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
25th Nov 04 at 10:22   View User's Profile U2U Member Reply With Quote

The head design is also different, in the ports and valves are larger.

You'd need
Head
Cam
inlet manifold
Exhaust manifold
Loom
DIS pack
Fuel pump
Also if the engine Spi doesn't have a crank sensor then you'd need
oil pump
crank sensor
Crank pulley

so just swap the engines over
PaulW
Member

Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
25th Nov 04 at 10:25   View User's Profile U2U Member Reply With Quote

i used a 1.4sri 8v head on my SPi engine, kinda helped torque a bit & top-end power, but was still running the SPi setup...

only main issue i had was it ran a bit lumpy when cold with the sri head
Rileysport
Member

Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
25th Nov 04 at 10:27   View User's Profile U2U Member Reply With Quote

my SRi's lumpy when cold anyway
PaulW
Member

Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
25th Nov 04 at 10:37   View User's Profile U2U Member Reply With Quote

must be something with the ports duno...

still it sounded 'different' when it was done

i want another corsa with an 8v engine there sooo nice to work on!
Rileysport
Member

Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
25th Nov 04 at 10:38   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by PaulW
must be something with the ports duno...

still it sounded 'different' when it was done

i want another corsa with an 8v engine there sooo nice to work on!


thats why i'm trying to build a 2.0 8v turbo
PaulW
Member

Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
25th Nov 04 at 10:42   View User's Profile U2U Member Reply With Quote



I wana build an 8v on carbs - then get shut of the ECU
L885 1.28v
Member

Registered: 7th Aug 03
Location: Copthorne, Nr Gatwick
User status: Offline
25th Nov 04 at 12:05   View User's Profile U2U Member Reply With Quote

what difference does it make putting a mpi head on it then? could you also put a mild cam in the mpi head and get a decent power increase???
PaulW
Member

Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
25th Nov 04 at 12:18   View User's Profile U2U Member Reply With Quote

if you dont change the pistons, the compression ration will be lower & cause the engine not to run as well as it should as its N/A & not forced induction.
Rileysport
Member

Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
25th Nov 04 at 12:51   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by L885 1.28v
what difference does it make putting a mpi head on it then? could you also put a mild cam in the mpi head and get a decent power increase???


the cam in the mpi head aint anything that special

 
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