Mini Sport and coopercarcompany.com share the same address which is the dead giveaway.

John Cooper Conversion - Everyday Usability?
#16
Posted 05 May 2017 - 11:09 AM
#17
Posted 05 May 2017 - 04:57 PM
Better heads than Minisport? Which one?
No essentially in it, they are the same kit! That's a weighty price for a name and a slightly remastered mini sports calliper!
As said, minisport now do the engineering for the cooper garages. Their heads are the blue painted Ines under the cooper name. However, you can get the same head or better from other venders!
#18
Posted 05 May 2017 - 05:35 PM
Better heads than Minisport? Which one?
No essentially in it, they are the same kit! That's a weighty price for a name and a slightly remastered mini sports calliper!
As said, minisport now do the engineering for the cooper garages. Their heads are the blue painted Ines under the cooper name. However, you can get the same head or better from other venders!
Turbo Phil
Minispares
Benross
MED
To name a few.
#19
Posted 05 May 2017 - 09:54 PM
Thanks! I suppose I should have asked what makes these better? Has a comparison test been done?
#20
Guest_minidizzy_*
Posted 06 May 2017 - 01:04 AM
Good question. I would be interested in any answer.
Going back to the original questions, The original 1991 Cooper Si pack did not include roller rockers. Power output was quoted as 74 @ 5800 rpm and torque as 108Nm @ 3000 rpm. This was less good than the earlier S pack for carb Coopers as on my Mini. For this the figures were quoted as 78 @ 6000 rpm for power and 106Nm @ 3250 rpm for torque. The carb Coopers had a much better cam – the MG Metro cam. The carb conversion also had a 3.44:1 final drive but was not included with the SPi kit probably because fitting this involved taking the engine out of the car. In 1993 the Si plus pack was introduced to increase the power to 78 for SPis. This was achieved with high lift rockers, presumably to compensate for the disadvantage the SPi cam had compared with the MG cam.
I cannot speak about the fuel economy of the Si or Si plus kits but my 1990 carb Cooper with S pack gives just over 40 mpg. The service record for my car has shown no reliability issues. An oil cooler is not really necessary.
The S pack was developed by John Cooper Garages with Janspeed. I believe David Vizard was associated with Janspeed around that time. He is featured in the video. Janspeed could not meet all the demand so Minisport and others took on some and then all of the output.
I have a particular interest in Cooper conversions and regularly talk to ex-JCG employees.
I would be genuinely interested to know if the new versions are just rebranded Minisport but without concrete evidence I will tend to doubt it. The Cooper Car Company is owned by the Cooper family and not Minisport even though Minisport continue to produce and sell the Cooper designed kits on behalf of Coopers. Callipers have never been part of the conversion kits.
#21
Posted 06 May 2017 - 07:28 AM
Thanks! I suppose I should have asked what makes these better? Has a comparison test been done?
I don't know if any comparisons have been done, but the likes of Turbophill and AC Dodd have far better reputations.
Phill did my head and was an absolute pleasure to deal with, helped me with spec, gave me loads of advice, our PM conversation is 3 pages long.
AC Dodd did all the rest of the work on my engine and saw where I was going wrong on pics I published on Facebook, phoned me up and talked me through stuff.
A head isn't a bolt on mod, it needs to suit the application and using one which has been modified to your specific will give better results
#22
Posted 06 May 2017 - 09:33 AM
The carb conversion also had a 3.44:1 final drive but was not included with the SPi kit probably because fitting this involved taking the engine out of the car.
and that made all the difference effectively bringing the gear ratios closer together and still good for 100+ mph which is 30 more that you should be doing on the public highway
when MG Metro`s were plentiful and about £50-£130 on average ( those were the days ) you could chuck the motor in your mini and you had a quick motor all down to that diff ratio.
Check out Guessworks speedo ratio calculator and you can check diff ratios against road speed.
#23
Posted 19 May 2017 - 05:09 PM
#24
Posted 19 May 2017 - 05:10 PM
If I remember correctly, my 96 Cooper S, 80bhp used to return 36-38mpg.
John Cooper Spi
#25
Posted 19 May 2017 - 05:27 PM
With its standard power, it was very usable daily. It has a claimed 0-60 of 8.9 seconds, and felt very quick through the usable speeds (namely 30 through 70). It was a tad loud on the motorways but I think the FD was in the 2.7 park. It was designed for back lane blasts rather than 100 mile cruises.
I absolutely love the little car and would definitely recommend the SPi Cooper S cars (the GP is essentially a S Works). So much fun, and it came with a unique leather interior, walnut trim all over the place. I can't wait until mine is back on the road!
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