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Single Point v Multipoint Injection
- Thread starter DTWD
- Start date
The difference is that with multipoint, a correct amount of air/fuel is mixed for each cylinder. With single point, one lot is mixed, and then distributed to each of the cylinders.
The problem with singlepoint is that it retains some of the shortcomings of the carb. For example, the car tends to run slightly richer than a multipoint car as the cylinder furthest away from the injector will get the least amount of fuel, so in order to not underfuel this cylinder, the rest tend to run slightly rich.
This is all just info I have read from various places - correct any of it if its wrong.
zedx19
ClioSport Club Member
Golf GTi DSG
The MPI in mk1 Clio actually had less bhp then the SPI, but it did have more torque and was quicker to 60 then the SPI. The MPI engine in the RT was put in on late phase 2 and phase 3 mk1 Clios as far as Im aware. 99% on mk1 phase 1 1.4 were SPI, cept a few early carb models.
Dont see the point in changing engine bits to make it MPI from SPI, just buy a MPI engine from a scrapper for £50 and whack in if you really must have a MPI 1.4!! Get the S gearbox an all, shorter ratios, quicker again to 60!
Sorry just to butt in, there were no mk1 1.4 multipoint injection clios, they are all single point injection.
I have one of the latest mk 1s (1998 1.4S) and it is the same engine as the earlier RTs as far as I can tell.
Although as mentioned it is supposed to be down 5bhp on the earlier engine but half second quicker to 60.
zedx19
ClioSport Club Member
Golf GTi DSG
Yes there was!! Yours is more then likely MPI, some late phase 2 were MPI as well. Yours also has the short ratio gearbox an all, now knowing Renault they could have used to SPI on the S and just switched the MPI on phase 3 RTs. Who knows with Renault!!! Who knows why the hell they decided to make that sh*tty mk1 Night and Day Clio with a 1.1 Carb engine out a R5 innit. Why oh why!!!!
Whats the engine bay laid out like in yours then Ben P? Where abouts is the air filter located?
Zed I am not trying to start an arguement but there were not any 1.4 MPi mark one clios ever made (in this country at least.)
How do I know mine is SPi? Because I can see that there is only 1 injector.
Air filter is mounted on top of engine as with all 1.4 Energy units.
Yes my car has close ratio box but it still only spi.
Tell me (or show me) one mk1 clio with a 1.4 MPi engine.
Zed I am not trying to start an arguement but there were not any 1.4 MPi mark one clios ever made (in this country at least.)
How do I know mine is SPi? Because I can see that there is only 1 injector.
Air filter is mounted on top of engine as with all 1.4 Energy units.
Yes my car has close ratio box but it still only spi.
Tell me (or show me) one mk1 clio with a 1.4 MPi engine.
)
zedx19
ClioSport Club Member
Golf GTi DSG
LMAO, talk about spam, anyway, lemme find some proof for you!
Grrrrr, why is it half the sites at work are blocked! Anyway, heres summit
http://www.parkers.co.uk/choosing/performance/performance.aspx?model_id=238http://www.parkers.co.uk/choosing/performance/performance.aspx?model_id=238
Pre 96, 80bhp, post 96, 75bhp, doesnt actually say MPI/SPI on there but the MPI engine did have 5bhp less but more torque. (I can see another arugment starting now asking why the same car with less power is 1 second quicker to 60!) As I said though, strange Renault stuff might not have put the MPI engine into the S, i dunno why but you know Renault, lets put 2 different types of calipers on the same car, same year, same model just to annoy people, lets make a 1.8 Auto thats really slow, lets make a lighter version of the 172 then decide to add the weight back into it as a opition and destroy the exclusivity by whacking another colour in for a laugh. Lets make a limited edition Williams of 500, then decide to really piss off all the people that bought that by making the Williams 2 and 3. (Rant over)
Now if ya want arsey, you dickhead, listen to me now boy, there were mk1 MPI 1.4 Clios and I still dont believe the c**k and bull about a DOHC 1.2 16v.
