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Car Forum / MINI / January 2004S/C or helical
If I buy a gearbox for my mini (to do sprints with) witch should I choose and what's the difference between both ? > If I buy a gearbox for my mini (to do sprints with) witch should I choose > and what's the difference between both ? usually straight cut for competition. faster engagement The straight cut are noisy so they use helical for street cars. Others may add to this. Advantages of straight cut gears are that they have less power loss, and are stronger due to not side loading and can be cheaply made in different ratios. The dissadvantage is the are noisy (esp the drop gears, that are not submerged in oil) and they have a shorter life so are not suitable for road millage engines. > > If I buy a gearbox for my mini (to do sprints with) witch should I choose > > and what's the difference between both ? [quoted text clipped - 4 lines] > > Others may add to this. > Advantages of straight cut gears are that they have less power loss, and are > stronger due to not side loading and can be cheaply made in different [quoted text clipped - 13 lines] > > > > Others may add to this. And the difference between Dog box kit and straight cut drop gearkit ? both have the name competition next to it but no futher explain. My technical english is not that good to understand all too. Also do they make a difference in rubber coupling ,pot joint and hardy spicer type. With used to be on a 1991 mini 1000 cc check mate ?(I think rubber coupling if I look to them but maybe internal differences ??? Thanks in advance Read This http://www.minimania.com/MM/GEARBOX___Syncro_vs__Dog__engagement__875.htm A1991 mini will have pot joints. Early mini's did have the rubber coupling, but these are no good as a performance item. The hardy spicer type were fitted to the cooper S and a very strong. With regards to the gearbox question. What is your engine spec? If you only want standard ratio's I would stick with the helical box. Get it rebuilt by someone who knows what they are doing and you shouldn't have any problems. If you have a high spec engine then perhaps consider straight cut drop gears, but most importantly, make sure they have the correct float. Most failiours I have seen have been due to badly shimmed drop gears. > > Advantages of straight cut gears are that they have less power loss, and > are [quoted text clipped - 25 lines] > > Thanks in advance > Read This > [quoted text clipped - 24 lines] > > > > Thanks in advance It's a 1380 cc unit with about 110 a 120 bhp at the crank (If I may believe the seller of it) I don't know the manufacturer of it but I think he said swiftune > Read This > [quoted text clipped - 13 lines] > gears, but most importantly, make sure they have the correct float. Most > failiours I have seen have been due to badly shimmed drop gears. Good tip that link. I will keep it on a straight cut synchro version but not yet sure if it will be a 4 or 5 speed box. Witch company is good ? KAD MED ... (not cheap but are quality wice a good choice I believe and hear from others) 5 speed boxes are not suitable for high powered applications. If you want a recomendation for the best place, then I've heard very good things about ML motorsport. Their gearboxes are sposed to be top notch. They have a web page you can find on google. The telephone number is +44 (0)1959 533130 Tell them what you want and I'm sure they can advise you best. > > Read This http://www.minimania.com/MM/GEARBOX___Syncro_vs__Dog__engagement__875.htm > > A1991 mini will have pot joints. > > Early mini's did have the rubber coupling, but these are no good as a [quoted text clipped - 18 lines] > ... (not cheap but are quality wice a good choice I believe and hear from > others) > 5 speed boxes are not suitable for high powered applications. > If you want a recomendation for the best place, then I've heard very good > things about ML motorsport. Their gearboxes are sposed to be top notch. > They have a web page you can find on google. > The telephone number is +44 (0)1959 533130 > Tell them what you want and I'm sure they can advise you best. OK thanks. The 5 speed Jack Knight Box is bullet proof because they don't unlike others bolt the 5th gear on the end, they make the shaft all one piece. MiniSpeed are a great place to get Jack Knight boxes from as are MED in Leicester. Good Hunting. Karl. Currently running a 1450cc 110bhp-124lbs/ft on a 5 speed Jack Knight. > > 5 speed boxes are not suitable for high powered applications. > > If you want a recomendation for the best place, then I've heard very good [quoted text clipped - 4 lines] > > > OK thanks. > The 5 speed Jack Knight Box is bullet proof because they don't unlike others > bolt the 5th gear on the end, they make the shaft all one piece. [quoted text clipped - 4 lines] > Karl. > Currently running a 1450cc 110bhp-124lbs/ft on a 5 speed Jack Knight. hmmm sounds like a nice engine to me :-) Where do you bought it ? Med,KAD,ML Motorsport I'm interested because I bought a second mini and I'm thinking of preparing it too for motorsport. The Box came from MED in around 92-93 not to sure and the Head is from MiniSpeed 36/32 stage 5 as for the block and crank well they were just machined from standard by a company in the midlands, the cam is a Kent 296 with standard rockers. You should be able to find a similar engine spec at MED and I can recommend them for there quality and attention to detail. Karl. > > The 5 speed Jack Knight Box is bullet proof because they don't unlike > others [quoted text clipped - 11 lines] > I'm interested because I bought a second mini and I'm thinking of preparing > it too for motorsport. |
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