Articles search results for 2nd gear

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Seems recently a number of folk have been suffering gearbox failures of various sorts; nothing new there then except they've popped their heads up over the parapet to ask why. part numbers: C-22A1738, C-22A1731, 88G396, CHM141, 13H9513, 22A611, 22A610, TSP100390, TSP100400, 22G2595 Under closer scrutiny this time around the reasons for bearing failures, gear tooth breakage, and jumping out of gears to name but a few are the sources of hassle. Just like in engine building, a gearbox needs careful and proper attention when building it up. It isn't a difficult job, and most competant DIY mechanics can make a decent job of it. But, just like engine building, it's the knowledge of what to look for prior to and during the build that sets the 'professional' builders apart. Hopefully resulting in a more reliable, perfectly functioning unit. One generally over-looked, or completely missed, feature is where the layshaft is carried in the gearbox casing itself. The shaft merely runs in tw

GEARBOX - Syncro vs 'Dog' engagement

NOTE

; A 'high' or 'low' ratio gear is in reference to it's performance, not it's numerical number. To illustrate - a 'high' FD ratio will give 'higher road speed', but will have a numerically low figure. A 'low' FD ratio will give lower road speed, but have a numerically high figure. part numbers: C-AJJ3371, C-AJJ3319, C-STN39, C-AJJ4014, C-STN76, C-STN77 A by-product of this will be reduced acceleration capability on the 'high' ratio, increased acceleration capability on the 'low' ratio. The main gearbox gears work in the exact same way. Cog swapping Elsewhere we've considered what alternative standard production ratios are available - but that still leaves you with the power-consuming and limited-ratio alternatives helical tooth type gears. Not desirable in a competition orientated car. The solution to this comes in the form of several types of straight-cut gear sets (teeth are cut at 90 degrees across the gear as opposed to the angled helical type).

As outlined in the 'Gearbox - standard production gearbox types' article, it is entirely possible to change the common 4-syncro gearboxes to the helical close-ratio set-up as used in the Cooper S, 1275GT, 1300GT, and some early MG Metros providing the right parts can be sourced. And you don't already un-knowingly have the close-ratio kit fitted! Part numbers are detailed at the end.

The other pre-requisite for this conversion is that it can only be applied to the early, pre-A+ type mainshaft gears. That's those that have the square-topped teeth as supposed to the distinctively pointed A+ profile. This is because despite being endowed with A+-type fittings for the mainshaft end and layshaft, the conversion gears have the pre-A+ tooth profile. This is not to say that the conversion cannot be put into an A+ gearbox casing - it can and is detailed in the relevant article.

What is essential to understand is that the pre-A+ second and third mainshaft gears are going to be

The first Minis rolled off the production line with a three-syncro gearbox, first gear as explained earlier was still a hit and miss affair.

Terminology -
FD - Final Drive

NOTE; A 'high' or 'low' ratio gear is in reference to it's performance, not it's numerical number. To illustrate - a 'high' FD ratio will give 'higher road speed', but will have a numerically low figure. A 'low' FD ratio will give lower road speed, but have a numerically high figure. A by-product of this will be reduced acceleration capability on the 'high' ratio, increased acceleration capability on the 'low' ratio. The main gearbox gears work in the exact same way.

I’m sure we’re all aware of Sir Alec Issigonis’ brilliant solution to the gearbox location in the Mini - just fold it up underneath the engine, simple. Following is a résumé of the production gearboxes to date.

What they don’t tell you in the manual! Terminology - FD - Final Drive (diff ratio) What they don’t tell you in the manual! If you’ve decided the FD fitted isn’t what you want, changing the FD is possible without separating the engine from the gearbox. Removing the diff case will allow you access to the diff assembly to change the crown-wheel, and access to the gear-change linkage. Use a manual for crown-wheel replacement. While you’re in there it would be just as well to replace the thrust washers and diff-pin as these are the source of many a gearbox problem. Particularly for up-rated engines where fitment for the competition diff-pin is highly recommended. Once again, follow the manual here. Now the bit they don’t tell you how to do... Rod-change types - Removal of the speedo drive housing gives access to the pinion retaining nut (1.5”AF socket needed and a long bar). To be able to undo the pinion nut (torqued up to 150lb ft !!) you need to engage two gears - 2nd and 4th - t

Having made some improvements and progress at Croft the decision now was – what to do next? The increase in toe-out on the rear, despite being a small amount, seemed to help get the car turned better. Should I add more? In my 'softly softly' approach to getting the car sorted so I don't loose my way I contemplated this for a while and decided that on the whole it would be better to go to Snetterton with the car as it finished at Croft....

At long last the successor to my stolen rally prepared Austin Cooper S, 277 BRX, has emerged from a 12 month rebuild of another Cooper S I bought in 2007. This car is a Morris Cooper S first registered in 1965 and converted into a 60’s rally replica, but not prepared to the current regulations for special stage rallying, and is now stored off-site for obvious security reasons.

Despite my knowledge of old minis...

Mallory Park was the venue for the penultimate round of the 2008 Super Mighty Minis Championship. A fine start to the day soon clouded over as so may days this

Getting the car ready for the first race was not quite the last minute flurry of panicked activity it usually is. Largely because the re-fit and re-furb were kept to a minimum following complete strip re-build plans shot to pieces by tradesmen being somewhat hard to pin down to get very necessary domestic work done.

Most importantly the doors and windows in the garage. The special concertina type front doors have been falling slowly decaying over the past few years....

One hundred and fifty crews made up of 93 modern and 54 historic cars assembled in sunny conditions at 8.00 on Sunday 2nd June in Oostrozebeke, Belgium. The rou

With Torrential rain forecasted the decision was made to err on the side of caution in qualifying with 45 cars in bad conditions. As predicted, with the mini and its ultra stiff set up and its limited slip diff breaking at 200ft/LBs, it would've been an understatement to say the car would be a handful. However, with perseverance and tenacity the mini ended its qualifying with an overall position of 21 out of 45 cars

Straight Cut Gear Kits

Table of straight cut gear sets.

Brands Hatch Hoorah

Rounds 3 & 4 at Brands Hatch Mini Festival were almost 3 weeks ago but nevertheless I'll get typing and give a quick preview for this weekend's event at Cadwell Park. The weather was a bit of a mixed bag at Brands Hatch and I have to admit, the wind is not my favourite, especially when there are gazebo's in question! We didn't sail off into the distance so that's good but we did come away with some good learning outcomes, best quali position and good points in the bag.

Snetterton 2015 Mini Se7en Race Report

Snetterton Mini Se7en Race Report The season is certainly in full flow, having got past the first weekend of the season at Castle Combe; A time for reflection and preparation. All eyes were on the weather forecast ahead of the Norfolk trip – rain or sunshine, which would it be. Plenty of fellow racers wish away the rain but I was certainly looking forward to a spot of wet weather dancing, after all what do they say about those who do well in the wet?

Rally Isle of Man 2015

1st in Class for MiniSpares Team on Rally Isle of Man 2015

After a great battle and a gruelling 3 days with 185 miles of closed road Special stages, the MiniSpares supported crew of Peter Horsburgh and Graham Carter in their Mk1 Cooper S were victorious in the “Mini” class RC7.

DIXIES HISTORIC CHALLENGE 2016

DIXIES HISTORIC CHALLENGE 2016 - 1st May Epynt Ranges

This is just a brief report as the ranges are not a favourite of mine with constant blind crests, typical Welsh weather (Wet and windy and cold), and scrutineering starting at 6 am!!

BigMacRacing mini se7en - 2016 Castle Combe

Bank holiday 29/30 May took the Mini 7 Racing Club back to the previously water-logged Wiltshire circuit, Castle Combe. This time however it was a different affair - no rain in sight.

Zandvoort Double Podium

Zandvoort Double Podium

The Mini 7 Racing Club's season finale took us to Zandvoort for the second year running, although last year it was a non-championship round. Both championships had already been wrapped up - Ashley Davies topping the points table for the mini se7en challenge supported by Mini Spares, and Shayne Deegan for the mini miglia challenge supported by Mini Spares. Well done to both of you.

Over the last few years we have developed this gear kit to be the ultimate for the rod change gearbox! Although there are many advantages to using a straight cut gears, often their disadvantages outweigh the advantages....

Alex Comis reports on his opening race of the Mighty Minis Championship 2018

Articles search results for 2nd gear

1st in Class for MiniSpares Team on Rally Isle of Man 2015

DIXIES HISTORIC CHALLENGE 2016 - 1st May Epynt Ranges

BigMacRacing mini se7en - 2016 Castle Combe

Zandvoort Double Podium

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