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I-6 in an MGB

Posted by scottydawg 
scottydawg Avatar
Scott B
MTP, SC, USA   usa
1973 MG MGB

This thread got me thinking:
http://www.mgexperience.net/phorum/read.php?40,780424

Does anyone have any idea if an I-6 transplant has ever been done on an MGB? I was specifically thinking about the 80's BMW 2.0-2.3 litre engines.





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Niels Christian Nielsen
Trondheim, Norway   nor
1967 MG MGB GT "Blåbæret"
2004 MG ZT

There was one with a Nissan Skyline RB25DET(t?) in a post on here a few months back. It had to have the heater shelf cut out to make it fit.



Niels

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scottydawg Avatar
Scott B
MTP, SC, USA   usa
1973 MG MGB

Depending on the oil pan config, it might be possible to move the engine forward along with the rad...

I mean, they did it with the MGC. I like the BMW motors, they're nice and torquey.






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chuckw2 Avatar
Chuck Williams
SoCal high desert, USA   usa
1967 MG MGB

There's a youtube video of a turbo Supra-powered GT beating the snot out of a new Vette in a drag race.
scottydawg Avatar
Scott B
MTP, SC, USA   usa
1973 MG MGB

I actually had an email exchange with that guy.

That car is insane.

Niels, thanks for the tip, I searched and now my brain is full.

I have a line on a 5-speed 2.3 1983 driveline. Unfortunately it's still attached to a Baur eurospec 323i and the owner wants $900.





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Niels Christian Nielsen
Trondheim, Norway   nor
1967 MG MGB GT "Blåbæret"
2004 MG ZT

Good thing about the BMW engines is that they're slanted over to the righthand side making them less tall. Howevere there's not much room from the front crossmember up underneathe the bonnet so even if the engine had a rear bowl sump it won't be possible to fit anything larger than a rotary ov the cross member. Have a look at my zetec thread for pics.

Best way to fit would be to remove heater shelf IMO. If you do go BMW engine there's not much difference between the 323i engine upto the last 6 cyl M3 engine in outer dimensions if I remember correctly so the scope for future upgrades would be fenomenal.



Niels

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scottydawg Avatar
Scott B
MTP, SC, USA   usa
1973 MG MGB

Right on, Niels.

I don't have a problem cutting up a crossmember for more clearance. It's when you start moving the steering rack around that you start to get weird things happening.





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Benny Avatar
Ben E
San Diego, CA, USA   usa

scottydawg Wrote:
Quote: It's when you start moving the steering rack around that you start to get weird things happening.

Weird things also start happening when you start cutting strength out of sheetmetal box sections designed to carry all of the loads from the suspension springs, the dampers, and the brakes.

The B crossmember is over-built, there's no doubt, but there are limits as to what you could/should take out of it.
scottydawg Avatar
Scott B
MTP, SC, USA   usa
1973 MG MGB

I'm aware of that.




"Since the creation of the Internet, the Earth's rotation has been fueled, primarily, by the collective spinning of English teachers in their graves."

"Keep in mind that free advice can frequently be worth less than you pay for it."
Niels Christian Nielsen
Trondheim, Norway   nor
1967 MG MGB GT "Blåbæret"
2004 MG ZT

Benny - that is exactly why I modified my sump instead of the front crossmember



Niels

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1744 Avatar
Bill Guzman
California, USA   usa
1973 MG MGB GT "Renegade I GT"
1974 MG MGB "Renegade"

There is an MGB with a V12 Jaguar, the question is why an Inline engine.

Moving the rack is not a big deal, if you know what you are doing.

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cstrong45 Avatar
Chuck Strong
Bainbridge Island, Washington, USA   usa

Why not use a Subaru 2.5 liter 4 cylinder wiht a single turbo system producing a maximum 11.6 psi of boost that bumps the 2.5's output from 165 to 210 horsepower at 5600 rpm and a hearty 235 pound-feet of torque at 3600 rpm. It would fit into a B easily.

sailadams Avatar
Larry Adams
Atlanta, GA, USA   usa
1967 MG MGB GT "Jose The GT"
1969 MG MGB "Raggedy (Ann) Roadster"

Because an inline 6 is perfectly balanced, all by itself. But maybe even more because there is no exhaust note like it, except a V-12. If someone has put a 100mm or 91mm BMW 6 in an MGB or MGC, I would love to hear how.
Niels Christian Nielsen
Trondheim, Norway   nor
1967 MG MGB GT "Blåbæret"
2004 MG ZT

cstrong45 Wrote:
Quote: Why not use a Subaru 2.5 liter 4 cylinder wiht a single turbo system producing a maximum 11.6 psi of boost that bumps the 2.5's output from 165 to 210 horsepower at 5600 rpm and a hearty 235 pound-feet of torque at 3600 rpm. It would fit into a B easily.


I don't see how it'll fit. It's surely too wide being a boxer?

But I agree that a I6 would be awesome in a B (or a better I6 in a C). My dad used to have a Rover SD1 2600 and there's sometinhg about the howl from a I6 on full song smiling smiley




Niels

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david peterson
NH, USA   usa

cstrong45 Wrote:
Quote: Why not use a Subaru 2.5 liter 4 cylinder wiht a single turbo system producing a maximum 11.6 psi of boost that bumps the 2.5's output from 165 to 210 horsepower at 5600 rpm and a hearty 235 pound-feet of torque at 3600 rpm. It would fit into a B easily.

the biggest problem i have with any subaru power plant is no RWD.
1744 Avatar
Bill Guzman
California, USA   usa
1973 MG MGB GT "Renegade I GT"
1974 MG MGB "Renegade"


sailadams Wrote:
Quote: Because an inline 6 is perfectly balanced,

And then loose the balance of handling by havin the front of the engine hanging in front of the axle.

That statement is partially true. In the early days of the V engines it was difficult to achieve a good balance. New technology has made the V engines come out with less harmonics vibrations and better design crankshafts for a smooth running V engines, such engines as the GM LS series, Ford new generation V8's and yes the 60 V6 degree engines after 1988. Now the 4.3 is different story. After 1992 ? the 4.3 came with a balance shaft to make it a very smooth engine.

An inline with more than 4 cylinders will take more room, thus taking away the balance of a sport car.

You could cut everything and fit the engine so that it sets behind the water pump, then it could be a fun car.

Member Services:
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scottydawg Avatar
Scott B
MTP, SC, USA   usa
1973 MG MGB

I doubt it, the BMW engine is very light, maybe even equal to that BL cast-iron lump.

They did an I6 with the MGC, don't know how it could be any worse with an alloy or magnesium engine that weighs a lot less.





"Since the creation of the Internet, the Earth's rotation has been fueled, primarily, by the collective spinning of English teachers in their graves."

"Keep in mind that free advice can frequently be worth less than you pay for it."
BMC Avatar
BMC Gold Member
Brian Mc Cullough
Minneapolis, Minnesota, USA   usa
1959 Austin A40 Farina
1959 Austin-Healey Bugeye Sprite
1961 Austin-Healey Sprite "Green Sprite"
1969 MG MGC GT "CGT"
1979 MG MGB   → more

I do not like installing I6 engines in MGBs. It was okay for the C, but not really good. Wish I could have kept my CGT but too many cars now! Anyways, if i am going to design a car, its got to make sense. An I6 does not make sense to me in the MGB unless its about a 2.0L and really- REALLY short. About 4 inches longer than the B series.

Weight is another thing I do not like adding to a small car like the B or displacing the weight further forward, thus an all iron V8 does not thrill me for a balanced car. You can make them work from my understanding of all the others who have far more experience in this than me that post here.

The one thing I will not disagree with is that there is no sound like an I6 or a V12. The sound of an I6 sounds far better to me then most V8 engines. Everything from my parents twin cam 2.8L Mercedes-Benz 280 SE, my Bimmer 528, the Big Healeys that come through the door to the Jaguars. Okay, I have not heard a well tuned Dodge pickup with a straight six, but sure someone out there will prove to me they can sound good too.

It is only my opinion, fit what you want but I personally feel that the I6 engines need to stay in mid size to full sized vehicles... Like the Chevy Trailblazer.

-BMC.

Member Services:
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FTD in an MGB Avatar
Ed Sweeney
Philadelphia, USA   usa

OK, how about the 2.0 liter I6 from the Triumph GT-6 , with a Moss supercharger on it?

Best of both worlds?




BMC Avatar
BMC Gold Member
Brian Mc Cullough
Minneapolis, Minnesota, USA   usa
1959 Austin A40 Farina
1959 Austin-Healey Bugeye Sprite
1961 Austin-Healey Sprite "Green Sprite"
1969 MG MGC GT "CGT"
1979 MG MGB   → more

I bet its too long for my Personal tastes. Too heavy all iron. The same basic motor as a TR6 with a smaller displacement correct? It's a Triumph anyways, thus there is nothing good about that either. (Thats a joke.)

-BMC.

Member Services:
BMC British Automobile is a Restoration and Repair shop north of Minneapolis, Minnesota. Our time is spent solely on British vehicles and British Conversions. MG and Austin are our specialties.
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