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MG MGB Technical - MGB fuel injection from MossMotors

Iam interested in the fuel injection system that is being sold by MossMotors,and want to know if anyone has used the system yet,and what they think of it,how the car runs,fuel mileage,etc,and if anyone is making a system that dosen't use the one piece manifold from the Zenith-Stromberg carb,would really like to use a header or the stock exhaust manifold from a twin carb system. Thanks Larry
LJM Lawrence

I installed a Moss system about 3 months ago. I live in a part of California with very strict smog inspections. The Moss system was an alternative for me as I did not want to deal with switching out induction systems every 2 years. The system is designed for the stock intake manifold. Keep in mind that not only is it "pricey" but it is not a performance oriented system. I think that there are a lot of better and cheaper alternatives for performance upgrades. Overall, it seems to work OK and has been generally reliable. The car runs more smoothly and a bit up on power. The only problem I have found is that it sometimes on warm startup kicks into a rich mode, with the motor stumbling until I turn it off and restart/reset. I would only recommend it for someone who has a late model B subject to smog inspections. It takes away a lot of the hassle.

Brian
r. LEARY

Brian. Very interesting. I had considered the fuel injection as being a performance modification which would also meet emissions standards. (Unfortunately, not here in Arizona where their books state "has a single carburetor" and that is the applicable standard.) I, too, had hoped that the Moss fuel injection system would provide a more efficient fuel. One which would provide both more power and one that would meet applicable emissions testing standards.

As for bi-annual emissions testing, we have to do it every year for cars made from 1967-1980. Thus, I have four vehicles which have to pass emissions testing every year. A major component in my life, especially the one which comes due during Arizona Summer. Very great fun to be working on a car in 110+ degree heat. It would be quite wonderful to be able to pass the required emissions testing, then, have two years to drive it without having to worry about such things.

Les
Les Bengtson

If your outside of California where you do not need this system, there are better choices, but for a bolt on, its probably one of the best current choices. This said without using it...

Now, you don't want the horrible 76-80 manifolds?

No problem. Here is what you need for "bolt on" from what I see and know.

First: Find an Austin Marina intake manifold for a 1.8L.

Install that with your header or leave the marina exhaust with it which is virtually identical to the earlier MGB exhaust manifold which really doesn't flow all that bad stock.

My Dad saved his marina manifold and used it for the first couple of years on his 1977 MGB. Decent system...


Your other choice is purchase one of the downdraught pierce or other brand weber type manifolds, make an aluminium adapter plate and bolt the moss system to that. Again, no experience with the Moss FI, but have the idea that it should not take too much to physically adapt this.

-BMC.
BMC Brian McCullough

Thanks for the comments so far,Iam not looking for high performance,but don't want it to be a dog also,Iam restoring a B-GT for long distance touring,which will include "AC",overdrive trans,so I want something will be super reliable with good fuel mileage without the balance problems of dual carbs.I have a Weber DGV on my other "B" now,and it runs "ok",but I like the ideal of turn the key and go.
Larry
Larry Mcphee

With all the current vehicles with FI. Would it not be possible to build a unit to fit the B that would give added performance? With FI, it would also be easy to add a turbo.

I know that you would have to make some other modifications so the computers that run these would work, but I have been learning a lot about my son's 97 eclips and know there are a lot of people building FI parts and systems these days.
Bruce-C

Larry,

My B/GT is set up also with A/C and O/D. We drove it on a 7319-mile trip this summer to California and British Columbia, and a 2451-mile trip this fall to Virginia and Massachusetts. It's been a super-reliable road car, consistently getting 30-33 mpg, and travelling through 100-degree heat, the A/C worked great. Depending on conditions and speed limits we drove 60-80 mph all the time. On our return from the west, we had 1000 miles of interstate posted at 75 all across Montana and North Dakota. We drove that thousand miles at a steady 80 mph.

My point is that it sounds like you need what we have, and we're getting along just fine with the oem dual SU HIF4s. Keeping them in balance (at least close enough to enjoy the car's modest performance) is not a hassle if the carbs are in reasonably good shape. Of course every four or five years I get out there and adjust those carbs, but no more than that.

My advice would be to make sure everything on the ignition side is good to go, head torqued, valves properly set, manifolds properly torqued so no leaking, crankcase breather in good shape, and well-sorted SUs. Then set 'em and forget 'em - for at least 20,000 miles.

You really don't need Moss FI just to get around balancing problems on dual carbs, and you'll like your SUs a lot better than the DGV!

FWIW,
Allen
Allen Bachelder

Hello,

I found that on EFI:

http://wisermotors.com/MGBEFI/intro.htm


http://www.hi-flow.com/HPSU2.htm

http://www.teglerizer.com/fi/MGB_twins/index.html

Well there is choices...

Cheers,

JGC
Jean Guy Catford

"With all the current vehicles with FI. Would it not be possible to build a unit to fit the B that would give added performance? With FI, it would also be easy to add a turbo."

Bruce, the injection offers more accurate metering, but it is just like bolting on different carbs. On the MG engine that is like trying to force golfballs up a garden hose - you just don't get much without improving the breathing of the engine, and that means either reworking or replacing the head.

There is no such thing as a magic injection system that will give you significant power just bolting it on. Having said that, a modern 4 port injection system on a crossflow 4 port head would be very nice, but I don't know of anyone that sells a well developed kit for that.

It is a lot easier to make injection run cleanly, given modern computer control, and it is more flexible than carbs normally are on a highly tuned engine, but they aren't magic and certainly can't cram more air through a restricted port area than anything else..
Bill Spohn

here is the link to Werner's website:
http://home.comcast.net/~whaussmann/wmgb/wmgbframeset.htm
You can get a lot of good ideas from his site but I have no idea how it will affect emissions.
thanks,
Ken
Kenneth Thompson

This is a great thread. I am always impressed to see how people reengineer things. It would look like a crossflow head with 4 ports would make a good base to work from for FI.

Bruce-C

This thread was discussed between 26/12/2007 and 30/12/2007

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