BritishV8 Forum: Re: Rover 4.9

Bruce Mills
Bruce Mills
Vancouver Canada
(71 posts)

Registered:
11/28/2007 09:31PM

Main British Car:
1974.5 MGB Roadster 3.5 Rover

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Rover 4.9

Posted by: Bruce Mills
Date: September 10, 2008 01:19AM

Hi

I have the specs for the Rover engines from the 4.6 down to the 3.5. But I am wondering if any one can tell me what the Bore,Stroke, Cylinder Capacity, Compression Ratio, BHP and Torque are for the 4.9.

I have located a 4.6 and wonder if I should wait to find a 4.9 or go with the 4.6. I will probably run it as a carburated engine. Hopefully all my external stuff from my 3.5, headers, intake, oil filter conversion from D&D, etc will just bolt on.

Would it mate up to the tranny bell housing?

Thanks for any information

Bruce

Moderator
Curtis Jacobson
Portland Oregon
(4577 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

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Re: Rover 4.9

Posted by: Moderator
Date: September 10, 2008 06:57PM

I'm no expert, but I think you'll find that there are several possible component combinations for stroking a Rover to 4.9. From what I can tell, most people leave the bore at 3.70" (i.e. the same as 4.0, 4.2 and 4.6 Rovers.)

Check with Woody at "The Wedge Shop" for expert advice. His contact info is in our vendor directory. The Wedge Shop offers a stroker kit. Here's a photo from their website:

http://www.thewedgeshop.com/images/strokerkit.jpg

Your intake manifold and bellhousing should be no problem. Your 4.6 front cover will get replaced with an earlier cover, and THEN your oil filter conversion should work fine too. You'll use the earlier oil pan. You may want bigger headers...

BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

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Re: Rover 4.9

Posted by: BlownMGB-V8
Date: September 11, 2008 11:04AM

3.7"? that's .050" smaller than a 300 or 340 block, so that crank would be about the same throw as a 300 crank. I've got two of those I need to get rid of. Soon as I find boxes to ship them in they'll go on ebay.

That block should be able to accept a 340/350 crank. Clearance at the cam would be the issue but it wouldn't be as bad as what I'm dealing with using aftermarket rods. Imagine that, you could probably get about 331 cu.in. that way. What would that be in liters? 3.7 bore, 3.85 stroke. A .030 overbore should give you about a 336. That's be about a 5-1/2 liter motor. Can't imagine why somebody hasn't tried it already.

Jim

Bruce Mills
Bruce Mills
Vancouver Canada
(71 posts)

Registered:
11/28/2007 09:31PM

Main British Car:
1974.5 MGB Roadster 3.5 Rover

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Re: Rover 4.9

Posted by: Bruce Mills
Date: September 11, 2008 10:40PM

Hi Guys

So are you saying there is no manufactured Rover 4.9??

Thanks

Bruce

Edited 1 time(s). Last edit at 09/11/2008 10:45PM by Bruce Mills.

MGBV8
Carl Floyd
Kingsport, TN
(4514 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

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Re: Rover 4.9

Posted by: MGBV8
Date: September 11, 2008 11:41PM

Yep. Rover stopped at 4.6, others didn't.

Bruce Mills
Bruce Mills
Vancouver Canada
(71 posts)

Registered:
11/28/2007 09:31PM

Main British Car:
1974.5 MGB Roadster 3.5 Rover

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Re: Rover 4.9

Posted by: Bruce Mills
Date: September 11, 2008 11:53PM

Interesting.

"others didn't"?

Could you clarify that a bit please

Bruce

filospinato
Jake Voelckers

(18 posts)

Registered:
01/15/2008 10:44PM

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Re: Rover 4.9

Posted by: filospinato
Date: September 12, 2008 12:28AM

I think TVR made a 5.0L and Wildcat produced a 6.0L.

[www.roverv8engine.co.uk]

Bruce Mills
Bruce Mills
Vancouver Canada
(71 posts)

Registered:
11/28/2007 09:31PM

Main British Car:
1974.5 MGB Roadster 3.5 Rover

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Re: Rover 4.9

Posted by: Bruce Mills
Date: September 12, 2008 12:54AM

Ok, thanks.

Looks like I am buying a 4.6 and will rebuild it. Probably stroking it as well.

More on this after I buy it.

Thanks

Bruce

Edited 1 time(s). Last edit at 09/12/2008 12:55AM by Bruce Mills.

MGBV8
Carl Floyd
Kingsport, TN
(4514 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

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Re: Rover 4.9

Posted by: MGBV8
Date: September 12, 2008 07:23AM

Plus Rimmer Bros. & RPI. All based on a bored & stroked Rover.

BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

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Re: Rover 4.9

Posted by: BlownMGB-V8
Date: September 12, 2008 08:44AM

The Aussies had a 4.9 Rover didn't they? Used it in trucks? Check out the 340 upgrade thread for details and photos on the cam clearance issues, 300 heads, pistons, rods, oiling mods, etc. TA may produce heads for it in a year or two. It's possible to build a really a fine engine.

Jim

Simon Austin
Simon Austin
Surrey, British Columbia
(107 posts)

Registered:
10/23/2007 01:44AM

Main British Car:
1977 MGB V8 / 1970 MGB GT V8 project Rover 3.5 / Rover 3.5

Re: Rover 4.9

Posted by: Simon Austin
Date: September 12, 2008 10:19PM

[en.wikipedia.org]

Here's a history of the Rover V8 including all the variations.

Bruce Mills
Bruce Mills
Vancouver Canada
(71 posts)

Registered:
11/28/2007 09:31PM

Main British Car:
1974.5 MGB Roadster 3.5 Rover

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Re: Rover 4.9

Posted by: Bruce Mills
Date: September 13, 2008 01:05AM

Thanks Simon for the Rover history.

I am off to take a look at the 4.6 tomorrow and find out how much he wants.

Know anyone who wants a 3.5??

Bruce

Simon Austin
Simon Austin
Surrey, British Columbia
(107 posts)

Registered:
10/23/2007 01:44AM

Main British Car:
1977 MGB V8 / 1970 MGB GT V8 project Rover 3.5 / Rover 3.5

Re: Rover 4.9

Posted by: Simon Austin
Date: September 13, 2008 07:11PM

No problem, Bruce. I've looked at that link a few times to clear up how many Rover variations there are. Good luck with the 4.6. That'd make for a great conversion.

Cheers
Simon

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