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MG MGB Technical - Horse Power
| Hi all, I need to know the Horse Power of my 1979 mgb roadster fitted with a Stage 2 1860 cc Engine. I know the approx BHP but the actual Horse Power is required for French Registration if anyone can help it would be appreciated. Thanks in advance OAO |
| M.J Egan |
| are you sure you're not mixing the two up, its more likely you hp rather than bhp of your engine so use the figure you know |
| Nigel Atkins |
| I have a feeling the French authorities use an old fashioned formula for registration (as indeed we did) - thus the "Deux chevaux" (or the Austin 7) When the MGB was introduced to the French Market - it was officially rated and somewhere in the Boulevard Saint-Germain a French official will be sitting on a type list. The fact that the car has been modified is irrelevant - unless you want to make life difficult for yourself. |
| Roger W |
| Roger, do you mean like the very old tax class where a '12hp' car wasn't necessarily 12hp? |
| Nigel Atkins |
| Hi Nigel No mix-up, they need the hp not BHP my roadster certainly doesn't have a 65 horse power engine OAO |
| M.J Egan |
| A 1798 cc MGB engine is 16 tax horse power ( RAC HP ) |
| Chris at Octarine Services |
| sorry I didn't make myself clear and it didn't help by my missing a word out I meant that it's you that's mixing up the two, it's more likely that you know the hp of your engine this figure you have mistaken for bhp what figures have you got and what do they relate to e.g. at flywheel fitted in car, at driven wheel including losses, engine claim, etc., ETA: possibly I've posted too late and it's resolved by Chris's post |
| Nigel Atkins |
| I wonder if Roger is giving you a hint - perhaps you want to check out some expert specialist advice before you fill the form as it may not be to your advantage to have a 1860 engine or higher hp some countries seem to be a lot stricter about changes from standard than the UK |
| Nigel Atkins |
| It may be the French authorities calculate the CV (horse steam) differently to how the UK did. The number of French fiscal horses is the result of an obscure formula taking many different factors into account. The prefecture will calculate it if you don't know it. |
| Chris at Octarine Services |
| See Wiki http://en.wikipedia.org/wiki/Horsepower#Metric_horsepower_.28PS.2C_cv.2C_hk.2C_pk.2C_ks.2C_ch.29 |
| Geoff Ev |
| Geoff - that only covers modern cars where the emissions are part of the type approval - i.e. cars built after 1998. Still safest to ask the prefecture to calculate it for the specific car. |
| Chris at Octarine Services |
| Thanks a bunch fellas, I'll go for 16 hp and let them tell me if they know different Thanks again OAO |
| M.J Egan |
| Hi - I have just had an email from a customer in France with an MGB GT and he says it is 10 CV! |
| Chris at Octarine Services |
| Good answer - I think we are all singing from the same hymnsheet. |
| Roger W |
| check Wikipedia: http://en.wikipedia.org/wiki/Horsepower#Metric_horsepower_.28PS.2C_cv.2C_hk.2C_pk.2C_ks.2C_ch.29 Have fun! ;) Siggi |
| Siggi |
| Siggi, You really put the debate on something of a higher level. Interesting but too deep pour moi Thanks OAO |
| M.J Egan |
| er, it's the same link Geoff gave earlier in the thread |
| Nigel Atkins |
uuups, sorry for not reading all of... Siggi |
| Siggi |
| Siggi, my comment was more for MJ don't worry about missing posts some don't bother to read most previous posts anyway better to have information twice than not at all |
| Nigel Atkins |
| Mine's (1800cc) rated at 10CV. Just make sure you tell them the car is a standard 1800cc, and standard everything else. Anything else will be making a rod for your own back. I had my Suzuki Bandit bored out from 600 to 884cc making it instantly illegal in France. Just for info: Our normally aspirated 2.2 ltr Renault Laguna 98bhp diesel is 7CV. Our turbo 2.0 ltr VW Passat, 140bhp diesel is 8cv. You work it out! |
| John Bilham |
| Lol - don't try and work it out - they are just taxation classes - I still can't reconcile how my 1.4 turbo diesel van costs £220 a year and the exact car equivalent costs only £30! My 6.5 ton HGV lorry is on;y £165 ... |
| Chris at Octarine Services |
| Here is a link that seems to provide the answer: http://www.citroen-ds-id.com/gen/Gen_CV_Calculator.html Up to 1977 it was a simple calculation based on engine dimensions and would make an MGB 10CV From 1977 on it is engine displacement, fuel type, number of gears and gear ratios! Makes an MGB around 16CV if you count overdrive as 5th gear, 17CV without overdrive! Richard |
| Richard Wale |
| Mine's 1977, 10CV. |
| John Bilham |
This thread was discussed between 16/01/2014 and 24/01/2014
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