ausmini
https://www.ausmini.com/forums/

carby -> fuel injection question
https://www.ausmini.com/forums/viewtopic.php?f=2&t=55318		 Page 1 of 2
Author:  Babes [ Mon Jul 20, 2009 7:36 pm ]
Post subject:  carby -> fuel injection question
How hard is it to convert from carbys to a fuel injection system and what roughly would be the cost of doing it? I have been told efi would be better for the supercharger set up when it gets here. Im more concerned with reliability than pure perfromance.
Author:  blue_deluxe [ Mon Jul 20, 2009 7:41 pm ]
Post subject: 
Could you find a 4 cylinder car with efi and take all the injection gear off it. Put a trigger wheel on the crankshaft. Put a lambda sensor in the extractors. And plug it all together to make it go?
Author:  Mokesta [ Mon Jul 20, 2009 7:48 pm ]
Post subject: 
^^^ Nope. Not on a 5-port head. Do a search for 5 port fuel injection and you'll find lots about the charge robbing issue.

You can do it if:
1) You use a small injector in a position a long way up the manifold. It will have a wide pulse width and the charge may mix sufficiently (see Rover single point)

2) You do port injection and you make it sequential and you alter the pulse phasing to combat charge robbing (see Rover multi-point). Not many EFI computers will give you that functionality cheaply.

3) You inject upstream of a supercharger so you mix the charge.

M
Author:  blue_deluxe [ Mon Jul 20, 2009 7:54 pm ]
Post subject: 
Would it work the way i said with a 7 port head? and run itb's?
Author:  drmini in aust [ Mon Jul 20, 2009 7:59 pm ]
Post subject: 
blue_deluxe wrote:
Would it work the way i said with a 7 port head? and run itb's?

7 or 8 port head, no problem. :wink:
But, some heads are better than others...
Author:  blue_deluxe [ Mon Jul 20, 2009 8:04 pm ]
Post subject: 
drmini in aust wrote:
blue_deluxe wrote:
Would it work the way i said with a 7 port head? and run itb's?

7 or 8 port head, no problem. :wink:
But, some heads are better than others...


Thats going to be the engine for my roundy, 7 or 8 port head with itb's and fast road/race spec.
Author:  simon k [ Mon Jul 20, 2009 8:07 pm ]
Post subject: 
blue_deluxe wrote:
drmini in aust wrote:
blue_deluxe wrote:
Would it work the way i said with a 7 port head? and run itb's?

7 or 8 port head, no problem. :wink:
But, some heads are better than others...


Thats going to be the engine for my roundy, 7 or 8 port head with itb's and fast road/race spec.


I had a play with a new Amal carb the other day - not EFI, but a nice bit of gear

a mate is in to racing old bikes and he'd just bought a new one
Author:  Angusdog [ Mon Jul 20, 2009 8:43 pm ]
Post subject: 
Canems do a kit, but you'll need to be fairly handy with electrickery. They've been installed on A-series engines (one was featured in Practical Classics magazine on an A40 Farina). It would be an interesting project. Perhaps try asking the same question on the MiniForum.co.uk.

Youtube video of the Canems kit here.
Author:  Babes [ Mon Jul 20, 2009 9:20 pm ]
Post subject: 
ok so not quite as easy as just bolting a few new bits on it seems. Is EFI really that much better than a well set up carby? The kit comes with a 1 3/4 SU.

Thanks for the links angusdog
Author:  drmini in aust [ Mon Jul 20, 2009 10:04 pm ]
Post subject: 
Babes wrote:
ok so not quite as easy as just bolting a few new bits on it seems. Is EFI really that much better than a well set up carby? The kit comes with a 1 3/4 SU.

Thanks for the links angusdog

SPI had less HP than the carby model.
People in UK used to convert them to carbys to get more HP. :lol:
Author:  Fat Boy Dave [ Mon Jul 20, 2009 10:31 pm ]
Post subject: 
Could try hiflow or Link
http://www.hi-flow.com/HPSU2.htm
Link had a fuel injector throttle body at the Mini show bolted onto the end of one of their supercharger kits. Brian said he had a customer that had a Rover that wanted one of their supercharger kits and wanted to retain fuel injection.

Failing that have a look at VMAX scart website in the UK. He is running fuel injection as an option with the kits he is selling.
Author:  bnicho [ Mon Jul 20, 2009 10:31 pm ]
Post subject: 
If I remember correctly the Practical Classics A40 used a Mini MPi intake manifold anyway?

People used to use Magna and Falcon SPi bits on all sorts of cars in the early 90's. BUt SPi is really just a fancy carb anyway. Better to stick with a 1 3/4" SU.

Cheers,
Author:  sgc [ Mon Jul 20, 2009 10:33 pm ]
Post subject: 
drmini in aust wrote:
SPI had less HP than the carby model.


The primary motivation for moving from carb to (SPI) EFI was for emissions control, not power -- you basically couldn't meet the unburnt hydrocarbon, oxides of nitrogen and carbon monoxide emissions regs with a carb. Better power didn't come until they went multi-point.
Author:  benoz [ Mon Jul 20, 2009 10:41 pm ]
Post subject: 
sgc wrote:
drmini in aust wrote:
SPI had less HP than the carby model.


The primary motivation for moving from carb to (SPI) EFI was for emissions control, not power -- you basically couldn't meet the unburnt hydrocarbon, oxides of nitrogen and carbon monoxide emissions regs with a carb. Better power didn't come until they went multi-point.


The HP difference from SPi to MPi is 1 hp, though the MPi has a little more torque. the real advantage to using efi for a supercharger would be the ability to change the fuel air mixture on the fly as far as I can tell with the O2 sensor giving real time data to the ecu.

Rover efi with Klas's mini squirt ecu can do the job, would cost in the region of $2k to do.
Author:  DOZ [ Mon Jul 20, 2009 10:45 pm ]
Post subject: 
Stick with a carby - its much cheaper to set up and can be tuned by a greater number of people. EFI on a 5 porter is very complex - the $$'s required would be better spent on other improvements such as a crossflow 7/8 port head

Daniel
Page 1 of 2 All times are UTC + 10 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/