- Joined
- Oct 20, 2007
- Messages
- 4,936
- Points
- 744
i did read it but the project just dissapears? what was the final outcome lol.
Tuning 75 inlett or uno inlett
- Thread starter clock34
- Start date
Currently reading:
Tuning 75 inlett or uno inlett
dont know what happened to it, think he sold a few bits off the car 
dont know what happened to it, think he sold a few bits off the car
shame
im guessing you finished this one brooky as shown by the picture in the other thread
ITB's would clear up the restrictions on the inlet side just try to get them long enough to be effective at a decent RPM
Ash
naa i never finished that, i keep changing my plans.
Waiting for an email then ill decide
Waiting for an email then ill decide
Just to make sure
: spi gasket on punto inlet, as u see the mounting is way different at the top! Don't know about the mounting points on the uno inlet, hope the match the p75 head!
Cheers!
They are bigger. However, much of the bigness is shrouded by the injector. The 1400 8v ones are bigger still.
If you want to go MPI, go MPI. You'll really need a better fuel pump and after market injection.
John, can you fit the 1368 8v head to the 1242? Any idea if the valves are bigger?
- Joined
- Oct 20, 2007
- Messages
- 4,936
- Points
- 744
ive got a stilo fuel pump from the 1.4 so it will be fine. and im not really bothered mpi or spi just making best of what ive got. and uno inlet is the same as a spi inlet so will fit the same 'adaption' meothods to fit to a 75 head.
maybe.... im told the 1.4 8valve head is slighly longer
and the 16valve 1.4 is slightly longer then the 1.2
Im told the cylinders in the 1.4 are slightly further apart. (which makes sense to me as there is not much meat left between bores on the 1.2)
not saying the head wont fit anyway
BUT 1.4 8valves are rare and expensive. id spend the money on a getting bigger valves fitted into a head of your choice.
Dunno about the valves, but the head should be a straight swap. (8v for 8v)
For the OP, forget the MPI head: the P75 head is basically an early 1108 MPI head. The only thing in its favour is the cam. Use your old head, the Uno mani, the P75 cam, fit a 40mm tb.
If you compare the factory figures for MPI and SPI 1108s, they've virtually identical -- it was an emissions thing.
thats not right.
I recon ive seen the heads of every 8valve (other then maybe the very latest)
And the ONLY place to get a head like a 75 mpi is from a 75.
all other mpi 8valve heads have much smaller ports. it is DEFIANTLY not at early 1108 mpi head as these have the smallest ports of them all (altho to mpi manifold stud pattern is the same between all mpi heads)
I own 4 75 heads. 2 cento heads, one punto 60 and one sei 1108 mpi head
- Joined
- Oct 20, 2007
- Messages
- 4,936
- Points
- 744
i already have a uno mani, a p75 cam and a larger tb. and im looking for more after that. and im thinking 75 head. bigger inlets but it will then need to go through the same exhaust so is it really going to help
Still, forget it. The size of the ports at the mani joint is irrelevant, it's the area around the valve head that matters. Any book on tuning will tell you the same..................
Decent porting job, exhaust mani, McCritch chip........... after that it's a better cam and ITBs (talk to Brooky).
Last edited:
but its not the manifold joint im talking about (which is the case with all the other mpi heads ive seen)
the 75 ports are larger all round. from the intake to the valve seat. the area with the valve stem is much larger to. much higher up then the sei head
the 75 ports are larger all round. from the intake to the valve seat. the area with the valve stem is much larger to. much higher up then the sei head
I've got one knocking around -- will take a peek when I get a chance. Possibly a head that's been ported? Generally when a head is ported by a pro, the shapes will be different: something that's obviously just wider might indicate that a DIYer has been at it.
I'd say just save up for a better cam with the venier pulley and have it set up on RR
Ming
Ming
