MG Sports Cars

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

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v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: December 19, 2014 03:41PM

Hello all, Haven't posted for a while.
Been very busy with upgrades. Mainly the rear suspension conversion to 4 trailing links with coilover shocks and a mumford linkage which seems to work very well indeed.
Just finishing an engine swap to a 5.0L rover short stroke with TA cylinder heads, 248 mechanical cam and throttle bodies.
The car is fighting against me though, as everything seems to have a knock on effect resulting in un expected work.
I should be starting the engine for the first time soon and once mapped will see if it has all been worth it.
There doesn't seem to be a lot of info about these heads. Has anyone published bhp figures? cant seem to find any reviews.
thanks
mark


mgb260
Jim Nichols
Sequim,WA
(1913 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.6 GT V8 Modified for road & track
Posted by: mgb260
Date: December 19, 2014 04:13PM

Mark, What did you do to upgrade the rear axles, posi?


v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: December 20, 2014 05:03AM

Jim,
I am using the MGB axle with quaife LSD. Also have had some special half shafts made which I am assured will cope with the abuse.
I re designed the area above the axle as you can see in this pic.
http://i76.photobucket.com/albums/j30/V8bloke/IMG_0460_zpsddb8bb48.jpg
Its difficult to get a decent photo but this one gives an idea of what I did.
http://i76.photobucket.com/albums/j30/V8bloke/IMG_0556_zpsee57b1e2.jpg
Also I had to re design the fuel tank. It now sits upright behind the mumford link.
http://i76.photobucket.com/albums/j30/V8bloke/IMG_05941_zps010d10de.jpg

http://i76.photobucket.com/albums/j30/V8bloke/IMG_06001_zps94f20395.jpg
It was a lot of head scratching!
Mark


mgb260
Jim Nichols
Sequim,WA
(1913 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.6 GT V8 Modified for road & track
Posted by: mgb260
Date: December 20, 2014 11:30AM

Wow!, Mark you have been busy! Keep us posted.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5626 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 4.6 GT V8 Modified for road & track
Posted by: BlownMGB-V8
Date: December 20, 2014 01:30PM

Not a lot of info yet on the TA heads. Art has a set but hasn't run them yet, looks like you get to be the pioneer, so we are very interested in your impressions and results. Nice work.

Jim


v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: December 23, 2014 08:17AM

Thanks,
Latest problem is that my alternator doesn't clear the new heads as casting is different than the previous merlins (was very close anyway). Getting very close to starting the engine for the first time. Should have some rolling road info early in January.

Mark


v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: January 18, 2015 03:13PM

Update
New alternator fitted and engine running. Needs re mapping now.
some pics.
http://i76.photobucket.com/albums/j30/V8bloke/IMG_07771_zps858b8dd3.jpg

http://i76.photobucket.com/albums/j30/V8bloke/IMG_07781_zps6d7216b2.jpg



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5626 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 4.6 GT V8 Modified for road & track
Posted by: BlownMGB-V8
Date: January 18, 2015 08:47PM

Looking good Mark! Interesting valve covers, I hadn't seen those before. Did you consider the TA ones, or just have those on hand?

Jim


v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: February 04, 2015 04:00PM

Jim, I had the covers made by these people [jrcast.com] you can choose up to 10 letters. Thought I would be a bit different.
didn't know TA made any!

Cheers
mark


Moderator
Curtis Jacobson
Portland Oregon
(4372 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: 4.6 GT V8 Modified for road & track
Posted by: Moderator
Date: February 04, 2015 05:59PM

re: "I had the covers made..."

They're so very cool!


MGBV8
Carl Floyd
Kingsport, TN
(3471 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: 4.6 GT V8 Modified for road & track
Posted by: MGBV8
Date: February 04, 2015 06:04PM

Quote:
I had the covers made by these people [jrcast.com] you can choose up to 10 letters.

Hmm.......R-O-A-D-M-A-S-T-E-R......yep, that's ten. Way cool!


v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: February 07, 2015 05:58AM

Rolling road 429bhp at fly 380 at wheels over 390lb ft torque. she is gonna fly!!!!!!!


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5626 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 4.6 GT V8 Modified for road & track
Posted by: BlownMGB-V8
Date: February 07, 2015 10:40AM

That's quite impressive Mark.
Do you mind revealing how much the rocker covers set you back?

Jim


v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: February 07, 2015 01:23PM

Jim, covers were about 200 inc shipping from Ireland.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5626 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 4.6 GT V8 Modified for road & track
Posted by: BlownMGB-V8
Date: February 07, 2015 02:56PM

Probably not out of line for a custom part. Might be out of reach for the Roadmaster though.

Jim



302GT
Larry Shimp

(188 posts)

Registered:
11/17/2007 01:13PM

Main British Car:
1968 MGB GT Ford 302 crate engine

Re: 4.6 GT V8 Modified for road & track
Posted by: 302GT
Date: February 11, 2015 08:18AM

Regarding the TA heads, on the v8 Owners Forum a 5 liter Rover (NA) with TA heads was reported to put out 429 hp (engine dyno).


302GT
Larry Shimp

(188 posts)

Registered:
11/17/2007 01:13PM

Main British Car:
1968 MGB GT Ford 302 crate engine

Re: 4.6 GT V8 Modified for road & track
Posted by: 302GT
Date: February 11, 2015 08:35AM

Clarification:
The 429 hp figure was extrapolated to the flywheel from a measurement at the wheels. Dyno graphs are not posted yet, will be in a few days.


mgb260
Jim Nichols
Sequim,WA
(1913 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.6 GT V8 Modified for road & track
Posted by: mgb260
Date: February 11, 2015 08:17PM

Larry, I believe it is Mark's engine in this thread


v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: February 15, 2015 05:04AM

Yes 429bhp at flywheel, 380bhp at wheels, 390ft lb torque.
Car is still at the rolling road as they have found a slight problem. intermittently one cylinder down ( number 6). They have diagnosed the injector as being at fault. Should have a replacement in a few days.
When I eventually collect the car I will upload the dyno sheet.
Mark


v8bloke
Mark Rawlins

(73 posts)

Registered:
02/02/2010 02:13PM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: v8bloke
Date: August 05, 2016 06:52AM

Well I haven't posted for a while.
I have been having a miserable time with the new engine. To cut a long story short The mapper messed up big time running the engine very rich which resulted in smoke puffing out the exhaust after only a few hundred miles.
Had to have the cylinders honed with new rings mains and big ends.
On top of this the Engine will just not run properly. I have replaced everything and come to the conclusion that it must be the Canems ECU.
While the engine was being refreshed I had the car blown over and tidied up.
http://i76.photobucket.com/albums/j30/V8bloke/IMG_1173_zpsfdszvtdi.jpg

http://i76.photobucket.com/albums/j30/V8bloke/IMG_1169_zpsrakhgpdu.jpg

http://i76.photobucket.com/albums/j30/V8bloke/IMG_1171_zpsp5c7m9wq.jpg

The car has been sent away to have a new Link G4 Extreme ecu fitted together with new loom. the tuning shop said it would take 2 to 3 weeks but has now been 10 weeks and still not done.
I'm feeling somewhat frustrated but hopefully I should see the car again soon and it should actually work.
Watch this space.
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