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: March 28, 2011 03:37PM

Definateley an improvement with the lowered panhard Bar.

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: March 29, 2011 06:39PM

Just uploaded some footage. Took a bloke for some passenger laps, his comments are quite funny.



J Man
jason adkins
NW OH
(194 posts)

Registered:
01/21/2009 08:49PM

Main British Car:
'61 Morris Minor panel, '70 MGB GT, '74 MGB GT MGB 1.8, unsure yet on the GTs

Re: 4.6 GT V8 Modified for road & track
Posted by: J Man
Date: April 02, 2011 07:03PM

Any chance you could do a write up for the Photo Gallery section, I did not see one there.


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: April 05, 2011 03:22PM

J Man

OK Ill take a few more photos and have a go!

Mark


Preform Resources
Dave Craddock
Redford,Michigan
(353 posts)

Registered:
12/20/2008 05:46PM

Main British Car:
72 MGB V6 3.4

Re: 4.6 GT V8 Modified for road & track
Posted by: Preform Resources
Date: April 06, 2011 06:29PM

Mark, been watching your videos,,,,,,,,,,,,,,,,,THEY ARE GREAT!


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: November 16, 2011 12:06PM

After destroying 2 big end bearings the engine is now 4.8 with a new standard 4.6 crankshaft and 96mm forged pistons.
Did my first trackday for six months last Saturday and found this on youtube.

[www.youtube.com]


RobertE
Robert Edgeworth

(77 posts)

Registered:
02/19/2008 08:27AM

Main British Car:


Re: 4.6 GT V8 Modified for road & track
Posted by: RobertE
Date: November 17, 2011 09:39PM

Wow! I've seen your videos before but I'm thoroughly impressed with the new handling characteristics - on this side of the pond they have an event called 'driftwater' where for a small price you can practice drift/grip skills. Your car looks like it would fair well in both. I'm wondering though what are the characteristics of the shocks you're running? I have a 4.9L setup and I'm considering rebuilding the shocks however I'm not sure if I should swap in the 20% stiffer valves or rebuild them to stock specifications(I have a rubber bumper model mind you).

Any advice? Keep up the good work



Moderator
Curtis Jacobson
Portland Oregon
(4365 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: November 17, 2011 10:14PM

Way cool video!


We need to get your car written up in the photo gallery.


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: November 18, 2011 12:50PM

Robert
Yes the handling is much improved with the new panhard location,
Curtis
Yes I need to sort this out, must take some more photos.


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 15, 2011 05:49AM

Here is a pic from last week at Brands Hatch.
http://i76.photobucket.com/albums/j30/V8bloke/XSP_9042.jpg

and here is a clip from the day.
[www.youtube.com]

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: June 17, 2012 04:05AM

Havent been on here for a while. Late last year I had a lot of issues with the car mainly with oil surge/pressure problems.
After the Big end failure in June last year i fitted the later intermediate timing cover with the crank driven oil pump and a Davies craig EWP. Straight away i was having problems with low oil pressure under medium to hard cornering. Was using the same sump/pickup so couldn't work out why. I tried fitting a big wing trap doored sump which improved things slightly but still not good.
Would like to have fitted a dry sump but space was too tight so as a compromise fitted an Accusump which seems to have solved the problem. Now have 2 Gopro cameras so video quality is improved.
Here is my latest adventure with the car spinning out near the end.

Cheers

Mark





Edited 1 time(s). Last edit at 06/18/2012 05:25AM by v8bloke.


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 22, 2012 06:15AM

Here are the latest upgrades, a rear Wing and front splitter. Yet to be tested on track.





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: April 12, 2013 06:07PM

Rear wing and front splitter getting their first test on Track @ silverstone.
[www.youtube.com]

A huge improvement to high speed stability and cornering.


Moderator
Curtis Jacobson
Portland Oregon
(4365 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: April 12, 2013 10:25PM

Awesome video!


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 12, 2013 04:18PM

Update.
Modifications are underway to fit these,
http://i76.photobucket.com/albums/j30/V8bloke/mark042_zps903535e8.jpg
Jenvey 45mm throttlebodies together with a Canems ECU
Hoping for superior power delivery and throttle response.



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 22, 2013 07:42AM

Nearly ready to fire up and start mapping.
http://i76.photobucket.com/albums/j30/V8bloke/IMG_0354_zpse3966642.jpg

http://i76.photobucket.com/albums/j30/V8bloke/IMG_0353_zps85856d4e.jpg

http://i76.photobucket.com/albums/j30/V8bloke/IMG_0352_zps09bc373f.jpg

Cant wait to get it up and running.


Moderator
Curtis Jacobson
Portland Oregon
(4365 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: August 22, 2013 12:53PM

That's looking fantastic!


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 31, 2013 01:36PM

The guys doing the conversion, [www.lloydspecialistdevelopments.co.uk] have managed to get it running and done some mapping on the road. Next step is a Rolling road session on Tuesday 3rd Sept so hopefully should get a power run and will post the dyno sheet.
Not expecting big gains in top end but throttle response and pickup should be improved.
Spec is 96mm bore, std 4.6 crank, forged pistons, Merlin F85 heads, Roller rockers, Mechanical 238 cam. 10.5:1 CR


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: October 03, 2013 03:54PM

Had to fit an uprated clutch as it started slipping on the rolling road. Re visited the RR today for final mapping and power runs.
Very happy with the results.
http://i76.photobucket.com/albums/j30/V8bloke/dynosheet_zps3bf8e40e.jpg

This is the latest vid with the new setup.
[www.youtube.com]

Cheers

Mark


DiDueColpi
Fred Key
West coast - Canada
(1256 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: 4.6 GT V8 Modified for road & track
Posted by: DiDueColpi
Date: October 04, 2013 03:19AM

Hey Mark,
I don't care if you made 2 hp and 5 ftlbs of torque.
The car looks meaner than hell and must be a thrill to drive.
Well done.
Cheers
Fred
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