Even at this level, expect to replace gearboxes more frequently, and car engine life will be shortened if the car is driven hard.Īround 100bhp is common. ![]() The gearbox is mentioned first because it was originally designed for an 848cc engine delivering 34bhp and has not been significantly strengthened since.Ībout 90bhp with a 1380cc motor is the limit for good all-round tractability and reasonable longevity of the engine and gearbox, without serious modifications to strengthen either. The more power, the more wear on the gearbox and engine. Other Things You Might Not Have Considered 1600cc motors have been produced by this method but can only be considered experimental. This is expensive but yields 1430-1480cc engines. To further increase cc's the engine can be stroked - the crankshaft journals are offset-ground and smaller con-rods are used to increase the stroke. Standard overbores are 1293cc, 1310cc, and 1328cc, although the block is commonly bored to 1380cc while retaining reliability.īores larger than this can take the motor to approximately 1400cc but bore strength is compromised. Given the expense, it is best to start with a 1275cc block. Re-boring the engine is the other direction to go in to increase power. Camshaft manufacturers can recommend the appropriate cam for your intended uses. In all the car can be extremely unpleasant to drive around town. An engine with one of these cams is likely to develop less power than an unmodified car below 3000 to 4000rpm. Longer-duration cams cause the car engine to idle unevenly and require frequent slipping of the clutch at low speeds, and also cause poor fuel economy at low rpm. A duration of 280 degrees or more results in less power than a standard motor (or at best, the same amount), until 2000-3000 rpm for "street" cams or 4000+ rpm for race cams, where the power curve rises rapidly, suddenly providing huge amounts of power. ![]() All camshafts represent a compromise between low-end and top-end power - a duration of 260 degrees is about as long as you can go without noticing a loss in low-end power. The next component to be changed is the camshaft. The cost of a replacement head varies according to the aggressiveness of the modifications. You might also consider replacing the cylinder head with one that has modified chambers and ports and larger valves. Some tandard DIY Mods to your Classic Mini are often easy and effective but does requires modifications to the engine and can include things such as Rocker Arms, Air Filters, and Exhausts. This does not provide significant advantages for engines in standard tune but should be a prerequisite for fitting a Stage 1 Kit.Īnd For Even More Power Consider These Mods These kits can be fitted by anyone with basic mechanical knowledge.Īnother possible modification is to replace the carburetor with a larger one. ![]() These elements are vital for future modifications and represent the cheapest methods of extracting more power from the car's engine.Īnd best yet, you can expect a power improvement of 20-25% PLUS an improvement in fuel economy. Stage 1 Kits usually consists of a new exhaust, LCB exhaust manifold, intake manifold, performance air filter and replacement carburetor needle, and is available for all engine sizes. This method has the advantages that the engine is all-standard and there is no need to dismantle it for its camshaft and cylinder head.īut sometimes, it is not practical to swap an entire engine and if you already have a good 1275cc engine installed, consider this instead. Minis already equipped with 1275cc engines can also be improved by swapping for one in a higher state of tune, most commonly the MG Metro engine. If you have a small-engine Mini, consider replacing it with a larger car engine as your first step towards more power, as a larger engine is a better base for future modifications. However, they are noisier and vibrate more than the smaller engines. Their 1275cc engines are usually cheaper than smaller motors with extensive modifications plus they are more tractable when giving the same amount of power. The cheapest way to add more power is to add more cc's. Improving your BHP - Standard Engine Swaps Differences in camshaft, cylinder heads and carburation account for the differing bhp figures for motors of the same capacity. Some car engine configurations are lumped together such as the 1300GT and Cooper S, despite the engines not being exactly the same. There are other configurations, such as the 997cc Cooper and the 970cc and 1071cc Cooper S, that are not mentioned as these are too expensive and rare to be used to boost the performance of other Minis. Harder to install, "Mini Turbo" has a certain ring to it. These engines are a great starting point for building a Killer Engine! MG Metro (interchangeable into any Mini or Mini Cooper) Austin 1100/Mini Clubman/100 Special 1961-1980Īustin 1300/Mini 1275GT/Allegro/Metro 1968-1990Įasy performance boost without engine mods.
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