Looks like someone has finally brought an EFI system to market for the A-series. Anyone know if they have actually made it work? I know from my research that while it isn't hard to get an EFI to idle smoothly, it is devilishly difficult to make it work at speed with a 5-port head.
http://www.gbcarparts.com/proddetail.as ... jectionKit
Fuel injection
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Westfield 129
- Posts: 882
- Joined: Sat Jun 04, 2011 4:20 am
Re: Fuel injection
Our friend Paul is working on one (A series specific unit) using a single large Honda (50 something mm!) motorcycle throttle body and a Maniflow single SU manifold. This should work as it is simple, and uses both cam position and crank position to fire a pair of injectors in stages. The original plan had two throttle bodies, but the size... Crack open the throttle and the air in the intake would just stop as there was so much area...
Of course, the real trick is the programming.
That said, the BMC A has been factory fuel injected in Europe for years with a throttle body, so the cylinder head is no real hinderance. Fuel and air flow into the ports just like any other engine. The problem is the programming of the injection itself, and most home garage engineers can't seem to get that right. Not a lot owners understand how the engine breathes, and give it way too much fuel, usually at the wrong time.
We will see how it all works out in the near future. Paul is a pretty sharp guy and his choice of an injection system that uses cam position to fire an additional injector was a good one. If it works, I may do another engine with it myself.
Meanwhile, I put some F2 E tubes into the carb on the new 1380 engine in my RHD car, combined with a previously chosen set of conventional jets, and have a perfect Weber, with scintillating throttle response throughout the range. Even I am amazed, but with carburetion like this, I don't need to go with injection. I am getting pretty good at choosing components for the Weber on an A series with a scatter pattern cam, and some healthy compression.
However, that engine management system on that link looks interesting, but could use a better intake manifold. Easily done, but it would have to be custom made to keep from poking the throttle body through the bonnet. However, what supplier of EFI ever said that their fuel injection was sure to guarantee rough running, poor mileage and miserable throttle response? Yet, striving to approach mediocrity is usually the best we can expect from most of the home programmed systems.
And, I can buy a lot of Webers and intakes for nearly 3 grand. Still, interesting...
Maybe with an alloy head and supercharger...
Seriously, you only know that it works when you spend the money, and sort it all out yourself. Otherwise, just a bunch of unfounded claims. While this system is interesting, so have several others I have seen. I will wait to see how Paul's works out before jumping in and buying one.
Of course, the real trick is the programming.
That said, the BMC A has been factory fuel injected in Europe for years with a throttle body, so the cylinder head is no real hinderance. Fuel and air flow into the ports just like any other engine. The problem is the programming of the injection itself, and most home garage engineers can't seem to get that right. Not a lot owners understand how the engine breathes, and give it way too much fuel, usually at the wrong time.
We will see how it all works out in the near future. Paul is a pretty sharp guy and his choice of an injection system that uses cam position to fire an additional injector was a good one. If it works, I may do another engine with it myself.
Meanwhile, I put some F2 E tubes into the carb on the new 1380 engine in my RHD car, combined with a previously chosen set of conventional jets, and have a perfect Weber, with scintillating throttle response throughout the range. Even I am amazed, but with carburetion like this, I don't need to go with injection. I am getting pretty good at choosing components for the Weber on an A series with a scatter pattern cam, and some healthy compression.
However, that engine management system on that link looks interesting, but could use a better intake manifold. Easily done, but it would have to be custom made to keep from poking the throttle body through the bonnet. However, what supplier of EFI ever said that their fuel injection was sure to guarantee rough running, poor mileage and miserable throttle response? Yet, striving to approach mediocrity is usually the best we can expect from most of the home programmed systems.
And, I can buy a lot of Webers and intakes for nearly 3 grand. Still, interesting...
Maybe with an alloy head and supercharger...
Seriously, you only know that it works when you spend the money, and sort it all out yourself. Otherwise, just a bunch of unfounded claims. While this system is interesting, so have several others I have seen. I will wait to see how Paul's works out before jumping in and buying one.
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Matthew Payne
- Posts: 1
- Joined: Mon May 06, 2013 7:54 pm
Re: Fuel injection
I'm fairly sure that this is the kit produced by Specialist Components (I have one of their systems in my Mini Marcos).
http://www.twinkam.co.uk/shop/article_S ... 08B.001%26
Matthew
http://www.twinkam.co.uk/shop/article_S ... 08B.001%26
Matthew