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Frequently Asked Questions

If you are after answers to questions relating to upgrades or general running and maintenance queries, then hopefully these FAQ will help!


Q: Will my insurance be affected by modifications, or will I get cover for my modifications?

A: Any modification from standard will need to be made known to your insurers.  Some modifications will not increase your premiums but it is worth checking with your insurers before you spend money on your modifications.  As to cover, some insurance firms will not cover anything too radical, so you may need to find a new insurer, such as the typical specialist companies that cater for kit-cars and custom cars. Link

Body Modifications:

Q: What will it cost to get my sills repaired?

A: It depends what level of quality you are prepared to pay for is the short answer.  A sill kit including all the metal bits necessary (outer sill, inner membrane and castle rail, plus jacking point and repair panel for the lower rear wing) will cost around £80-100 alone.  Then add labour and consumables, plus making good the paint work, and it can soon add up.  Typically a professional job will cost in excess of £1000 per side.  You can reduce the labour cost by preparing the car (stripping out carpeting and trim etc).  Then there is the unknown factor, what will they find when cutting back the metal, will you need repair work to the inner wing, splash panel, inner rear wheel arch etc?  Several places advertise sill repairs for under £500 per side but this doesn't allow for any other work.  I was lucky and found a local bodyshop that was able to fit my BGT in between other jobs and they did a professional job, so it might pay to shop around outside of the MG specialist trade, but always ask for recommendations from others and try and view their work before committing.  And don't be surprised if it takes a lot longer than you were quoted.  Of course, this is the stage to attempt serious body modifications if you are planning any! Link

Q: Should I use fibreglass wings?

A: For a standard wing, I would err towards the metal.  Fibreglass wings may be cheaper, but they can also be very difficult to fit properly.  Many also feel the fibreglass wing is not as safe as a metal wing which will crumple more progressively absorbing the energy of an impact.  I tried a set of fibreglass wings, but in the end I gave up and bought some decent second hand wings.  Usually, a good set of second hand wings will currently retail around £75-85 each from various specialists and privately, as opposed to the £250 or more for new Heritage wings.  Of course, if you are going Sebring, then fibreglass is the only way forward unless you have exceptional metal working skills!

Wheels & Tyres:

Q: What size tyres should my MGB/BGT have or what others could I use?

A: The standard fit was 165 14, but many owners now run with 185/70 14 on the same rim.  Larger rim size and tyres are possible. Link

Q: What tyre pressures should I use?

A: This is always a difficult one - modern tyres require different pressures compared to the original cross-ply or larger profile radials.  However, the original handbook book pressures for 165 14 tyres are about 22psi Front and  24psi Rear, which will be comfortable but modern tyres with lower profile such as the 185/70 14 requires a bit more.  try experimenting at different settings to see what works best - some owners report 26/28psi (front/rear) as being ideal for the modern radials and some report running as high as 30/32psi front/rear.  Don't forget to add a little extra for touring especially on motorways and with additional luggage.  But be aware that insurance companies will also check pressures when you make a claim following an accident.


Q: What fuel should I use?

A: The best you can afford!  In all seriousness, the cars were designed in the age of leaded petrol with 5-star in mind, and the handbook recommends an Octane (RON) of 97 or more.  Modern fuels are unleaded and come in 95 and 97 Octane ratings.  If you are reading this website, there's a good chance you want more from the driving experience so whilst 95 will suffice for most owners, the cars do tend to run better on super unleaded (97).  However, a number of owners report that Shell's V-Power (99 Octane, which superceded their 98 Optimax in August 2006) suits their car better and eliminates problems such as run-on.  Tescos now offer a RON 99 fuel, too, and it will be interesting to get feedback on this.  For more information, Link.

Electronic Ignition:

Q: Will electronic ignition improve the running of my car and which one should I buy?

A: Electronic ignition has various benefits over the old mechanical points system, such as improved starting, smoother running, and not needing servicing.  It can also improve fuel economy and spark plug life.  As to what to buy, it depends on your budget and skill level.  At the cheaper end of the scale, the Lumenition units are easy to install and maintain a period look under the bonnet but rely on the existing distributor.  The 123 unit is a little more complex but offers a new unit with a choice of advance curves to allow you to get the most out of your engine, especially if it has been modified.  EDIS is not for the faint-hearted, requiring a bit more skill/effort to install and a lap-top to set-up, but offering endless permutations of advance to suit a tuned engine.  Read more here - Link




The FAQs will link with existing pages on the site so more FAQs will be added in time.