turbo 2.25L - Land Rovers Only

CliftonRover · 05-05-2008, 04:13 PM

I am a mechanical engineering student at union college and i have been thinking about a project of adding a turbo to a 2.25L gas motor. I feel like it could be interesting and I know that someone used to do it. I have thought about the fuel system and considered switching to a simple efi system. I went to look for turbos an found them for 3 or 4 hundred which seemed cheap. I am unsure about the cam and the compression ratio. what do you think?

ArmyRover · 05-05-2008, 04:39 PM

be happy with 80 hp that comes from the motor normally.

jimfoo · 05-05-2008, 10:32 PM

The low compression would be good for a turbo, but I'd make sure you have a 5 main bearing engine. That and be prepared to go through lots of exhaust valves as they seem to burn/break easily. The cam is probably good as there is no overlap from what I remember. You could even take the oil for the turbo off the line to the head if you needed. BTW, the 77 normal hp was at the crank, not the wheels. 80 at the wheels is sweet however!

XtremeMarine · 05-06-2008, 05:24 AM

I agree with the premise that it would be a good project. Get an 84-85 5 bearing longblock. Get hardened valves, and make sure the exhaust valves are sodium filled for heat issues. Get some HD, or titanium valve springs. "T" the oil line to the head, just because it's easier. I think your biggest problem will be designing an exhaust manifold that will allow mounting of the turbo, and still have clearance for everything else. One thing I have always hated about engines with the intake and exhaust manifolds so close to each other. Great idea. Go for it, and good luck.

CliftonRover · 05-06-2008, 07:54 AM

thanks, it is my job to mess with things being an engineer. it might be a while, but hwere is the best place to find a 5 mb motor?

XtremeMarine · 05-06-2008, 10:00 AM

The UK. lol. They came out mid 1982 year, and were used in the SIII until it's end in 1985. Maybe some early 90's in 86 might have had them, but I believe the 2.5 was used in all but maybe the prototypes.

jimfoo · 05-06-2008, 08:39 PM

I thought most if not all SIII's had the 5mb engine, though maybe I'm wrong.

XtremeMarine · 05-07-2008, 07:53 AM

I've got a mid-year production 78', and an 81' SIII 109's in the driveway right now, both with 3MB engines in them. Both original to vehicles. My info was based on info gathered on lr4x4.com, and originally posted by Mrs. Turner at Turner engineering.

antichrist · 05-07-2008, 08:51 AM

DAP carried turbos for the 2.25 back in the 80's. Al had one installed on an 88. No idea if they are still available. Ring them up and ask to talk to Al.

05-05-2008, 04:13 PM	#1 (permalink)
CliftonRover Senior Member Join Date: Mar 2007 Posts: 105 Gallery: 0	turbo 2.25L I am a mechanical engineering student at union college and i have been thinking about a project of adding a turbo to a 2.25L gas motor. I feel like it could be interesting and I know that someone used to do it. I have thought about the fuel system and considered switching to a simple efi system. I went to look for turbos an found them for 3 or 4 hundred which seemed cheap. I am unsure about the cam and the compression ratio. what do you think?

05-05-2008, 04:39 PM	#2 (permalink)
ArmyRover Rebuilding Rover Join Date: Sep 2007 Location: NH Posts: 1,684 Gallery: 0	be happy with 80 hp that comes from the motor normally. __________________ "Only two defining forces ever offered to die for you, Jesus Christ and the American G.I. One died for your soul, the other for your freedom." http://snhlr.org/ 91 Range Rover Classic 90 RRC Parts truck 94 Saab gas mileage beater

05-05-2008, 10:32 PM	#3 (permalink)
jimfoo jimfoo Join Date: Mar 2007 Location: Colorado Posts: 364 Gallery: 9	The low compression would be good for a turbo, but I'd make sure you have a 5 main bearing engine. That and be prepared to go through lots of exhaust valves as they seem to burn/break easily. The cam is probably good as there is no overlap from what I remember. You could even take the oil for the turbo off the line to the head if you needed. BTW, the 77 normal hp was at the crank, not the wheels. 80 at the wheels is sweet however! __________________ Jim Hall “That man has no respect for his Rover and beats the hell out of it every opportunity he gets, taking the most difficult line over each and every obstacle.” Michael 1966 88" 1.9l VW TDI, GT1749V, IC

05-06-2008, 05:24 AM	#4 (permalink)
XtremeMarine Senior Member Join Date: May 2007 Posts: 1,380 Gallery: 0	I agree with the premise that it would be a good project. Get an 84-85 5 bearing longblock. Get hardened valves, and make sure the exhaust valves are sodium filled for heat issues. Get some HD, or titanium valve springs. "T" the oil line to the head, just because it's easier. I think your biggest problem will be designing an exhaust manifold that will allow mounting of the turbo, and still have clearance for everything else. One thing I have always hated about engines with the intake and exhaust manifolds so close to each other. Great idea. Go for it, and good luck. __________________ "In certain places, at certain hours, gazing at the sea is dangerous. It is what looking at a woman sometimes is." - Victor Hugo

05-06-2008, 10:00 AM	#6 (permalink)
XtremeMarine Senior Member Join Date: May 2007 Posts: 1,380 Gallery: 0	The UK. lol. They came out mid 1982 year, and were used in the SIII until it's end in 1985. Maybe some early 90's in 86 might have had them, but I believe the 2.5 was used in all but maybe the prototypes. __________________ "In certain places, at certain hours, gazing at the sea is dangerous. It is what looking at a woman sometimes is." - Victor Hugo

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05-06-2008, 07:54 AM	#5 (permalink)
CliftonRover Senior Member Join Date: Mar 2007 Posts: 105 Gallery: 0	thanks, it is my job to mess with things being an engineer. it might be a while, but hwere is the best place to find a 5 mb motor?

05-06-2008, 08:39 PM	#7 (permalink)
jimfoo jimfoo Join Date: Mar 2007 Location: Colorado Posts: 364 Gallery: 9	I thought most if not all SIII's had the 5mb engine, though maybe I'm wrong. __________________ Jim Hall “That man has no respect for his Rover and beats the hell out of it every opportunity he gets, taking the most difficult line over each and every obstacle.” Michael 1966 88" 1.9l VW TDI, GT1749V, IC

05-07-2008, 07:53 AM	#8 (permalink)
XtremeMarine Senior Member Join Date: May 2007 Posts: 1,380 Gallery: 0	I've got a mid-year production 78', and an 81' SIII 109's in the driveway right now, both with 3MB engines in them. Both original to vehicles. My info was based on info gathered on lr4x4.com, and originally posted by Mrs. Turner at Turner engineering. __________________ "In certain places, at certain hours, gazing at the sea is dangerous. It is what looking at a woman sometimes is." - Victor Hugo

05-07-2008, 08:51 AM	#9 (permalink)
antichrist Senior Member Join Date: Aug 2004 Location: near Altanta Posts: 437 Gallery: 0	DAP carried turbos for the 2.25 back in the 80's. Al had one installed on an 88. No idea if they are still available. Ring them up and ask to talk to Al. __________________ Tom Rowe Atlanta, GA Four wheel drive allows you to get stuck in places even more inaccessible. 62 88 reg 67 NADA x2 74 Air Portable - The Antichrist (tag 6A666) 95 D1 95 D90

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