MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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james.dades@comcast.net
jim Dades

(3 posts)

Registered:
12/31/2015 05:11PM

Main British Car:


Considering v-6 swap
Posted by: james.dades@comcast.net
Date: December 31, 2015 05:41PM

Hi All,

I'm new to this forum although I have been looking at the MG swaps for quite some time. There are some beautiful project posted. I am considering starting a 3.4 V-6 swap into an 80 rust free B that I bought and would like some feedback from those of you that have finished a V-6 conversion. I have looked at all the projects posted, read a lot of the details, but I would like some feedback on performance of the finished product. I would like to get an idea of 0-60 times with the V-6, or quarter mile times, with the various induction, gearing combinations. I have picked up a 94 Camaro and am considering keeping the fuel injection, but now I am wondering if it will all be worth it. I,m not looking for a 3-4 second 0-60, but sevens would be nice. Is this possible?
Thanks everyone.

Jim Dades


MGBV8
Carl Floyd
Kingsport, TN
(3516 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Considering v-6 swap
Posted by: MGBV8
Date: January 01, 2016 10:58AM

Sevens is do-able, easier with a posi.

What is the fixation on the 0-60 time? The MGB does not launch well, so that hurts the 0-60. Once underway, the acceleration will feel like a 6-7 second 0-60 car. If you feel the need for more, you will have to step up to forced induction or a larger V8.


james.dades@comcast.net
jim Dades

(3 posts)

Registered:
12/31/2015 05:11PM

Main British Car:


Re: Considering v-6 swap
Posted by: james.dades@comcast.net
Date: January 01, 2016 11:23AM

Since it's not that easy to find an MGB with a V-6 to test drive I guess I'm looking for a reference of some sort to gauge the performance. Out of the hole is important to me so 0-60 is the only reference that I could think of.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5658 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Considering v-6 swap
Posted by: BlownMGB-V8
Date: January 01, 2016 12:00PM

I had a stock 1970 2 door Cutlass Supreme that would do 6 seconds on the nose. (It would also do a solid 150 mph.) Nothing special about it really. 310hp, 3400 weight. 3.31 gears, no posi. So my guess is if you are close to the 10:1 weight: HP ratio and avoid excess wheelspin you are going to hit that number if you have decent gearing. At about 2400 lbs that means about 220-240 HP. Looks like the stock rating on the 3.4 topped out at 185 so you'll have a little work getting there but I'd be very surprised if it couldn't be done. Bear in mind you won't be getting much if anything extra out of your headers so it'll take a cam swap, or you might do it by keeping the stock axle gears. I think the old rule of thumb was that you want no more than 1-2 rotations of the rear wheels before they stop spinning and that can be done.

So you are in the ballpark but still 30-50 hp short.

Jim


MGBV8
Carl Floyd
Kingsport, TN
(3516 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Considering v-6 swap
Posted by: MGBV8
Date: January 01, 2016 03:55PM

Where do you live Jim D? There are quite a few V6 swaps.


Another Jim. Gonna have to start numbering you guys. :)


james.dades@comcast.net
jim Dades

(3 posts)

Registered:
12/31/2015 05:11PM

Main British Car:


Re: Considering v-6 swap
Posted by: james.dades@comcast.net
Date: January 01, 2016 06:53PM

I'm in the Chicago area. You mean MG V-6 swaps? Wow!


MGBV8
Carl Floyd
Kingsport, TN
(3516 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Considering v-6 swap
Posted by: MGBV8
Date: January 01, 2016 10:53PM

[www.britishv8.org]

That is just a drop in the bucket. Talk to Brian McCullough. He can point you to many more.

[www.bmcautos.com]



BMC
Brian Mc Cullough
Forest Lake, Minnesota, USA
(377 posts)

Registered:
10/30/2007 02:27AM

Main British Car:
1980 MGB '95 3.4L 'L32' SFI V6, GM V6T5 & 3.42 Limi

authors avatar
Re: Considering v-6 swap
Posted by: BMC
Date: January 11, 2016 01:24AM

Stepping in late to the party but I can give you a few ideas. I think with any MGB V6/V8 with a nice wide power band with around 200 or so at the flywheel should produce somewhere around 6 seconds or so. Like the others, I would also suggest that an MGB is limited in 0-60 by the potential track or lack thereof. To get an MGB down to 4 seconds would take a substantial amount of work but I don't think you are looking for that.

I own a 1980 MGB with the 3.4L SFI V6 in it and have been driving it since 2008 but have been building the conversions since 2000. Our shop is currently underway with four 3.4L conversions and we offer most of the parts and advice towards the build. Contact me sometime and i can give you direction for your build.

-BMC.


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