Classic Austin Mini-duplex Chain Gear Kit Lightweight-ms For Camshaft Drive

Classic Austin Mini-duplex Chain Gear Kit Lightweight-ms For Camshaft Drive

Classic Austin Mini-duplex Chain Gear Kit Lightweight-ms For Camshaft Drive
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$84.95
Part No: C-AJJ3324
In Stock
Internet Price $84.95
Alternate Products
Classic Austin Mini Duplex Timing Chain And Gearset Kit
$65.95 Classic Austin Mini Duplex Timing Chain And Gearset Kit
Classic Austin Mini Duplex Chain Gear Kit Cam Drive Lightweight
$128.95 Classic Austin Mini Duplex Chain Gear Kit Cam Drive Lightweight
Lightened cam gear from AE hepolite, duplex timing gear and chain set. Not recommended for race/rally applications. approx 69-70g 9% lighter
(See AEA687 for new counter-sunk screws)
General: Camshaft Drive Systems
If you are working on your engine and you want to do it right then you should consider how you are going to drive the camshaft. People often spend a lot of time picking the camshaft and then ignore the exact reason they spent so much time picking the cam. Driving the cam and controlling the timing relationships between the cam and the crank is what camshaft drive systems are all about. It makes no difference what the cam does if it does not do it in sync with the crank and pistons. The stock system on many 848, 948, 998, and 1098cc engines is a single chain drive between the crank and cam. The 'S' and some 1275 have a much better "duplex" chain. But even those do wear out! The best judge is to check it while you are taking it apart. With the timing cover off the engine rotate the crank a slight amount back and forth. The camshaft must move the exact distance at the same instance!
The least expensive but better than an old one is a stock cast gear and chain set. This budget standard cast duplex gear and chain set is the next step up, for road use only.
Fitment of an uprated cam drive system is essential when building a performance engine. Timing scatter induced by the standard set up can reach up to 15 degrees once the single row chain has stretched, which it does after only a few miles. This scatter not only affects the cam timing, but also the ignition, the distributor being driven by the camshaft. Power loss suffered by this phenomenon is substantial. Replacing the standard single row (simplex) system with a dual row (duplex) system greatly reduces the problem; use of a toothed belt system all but eliminates it. The belt system vastly reduces valve train noise and also helps damp out some of the odd harmonics generated by the 3 main bearing 'A' series engine. It is also extremely important to time any cam in to its required setting to obtain maximum performance, especially with performance cams. The 'dot to dot' method can, because of manufacturing tolerances, be out by as much as 15 degrees. Anything above 2 degrees out and power suffers - most noticeably in small bore engines. In race engines you probably lose 1 hp for every degree the cam is out, more when over 6 degrees!
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Related Technical Articles:
Classic Mini Cooper Camshaft drive kits page 39
Created: January 10, 2019
Camshaft to engine timing drive kits, single row chain, double row chains and belt drive kits are all options for the Classic Mini Cooper. Upgrade and high performance duplex chain kits with adjustable timing gears are also an option.
Timing Chain Replacement for A-Series engines
Created: February 28, 2018
Building an engine is very much like most things in life- the more attention to detail you give an effort the more likely you will get the results you were looking for. Whether you are installing a new stock or performance camshaft or even simply rebuilding your motor with the stock camshaft getting the valve timing correct is one of the more important things that you can do.
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VIDEO: How-To Set the Valve Timing on a Classic Mini 1275cc A+ Block Part 2
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VIDEO: How-To Set the Valve Timing on a Classic Mini 1275cc A+ Block Part 1
Choosing The Right Timing Set For Your Engine
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Created: February 25, 2014
Camshaft selection can be as complicated as you like, but for the ultimate performance, even if that means best gas mileage requires that you consider the entire envelope that the camshaft will work within. Non-technical issues such as intended application (street, race, milage or??), budget, expected RPM range, etc must be considered along with technical things like compression ratio, Cylinder head and valve sizes, exhaust system, carburetion, etc.
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