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Classic Austin Mini Rocker Assembly 1.5 Hi Lift Forged Rocker

Classic Austin Mini Rocker Assembly 1.5 Hi Lift Forged Rocker

Classic Austin Mini Rocker Assembly 1.5 Hi Lift Forged Rocker
Qty:
$279.95
Part No: C-AHT436
Internet Price $279.95
Alternate Products
Classic Austin Mini Cylinder Head Roller Tipped Rocker Assembly 1.5 Ratio
$449.95 Classic Austin Mini Cylinder Head Roller Tipped Rocker Assembly 1.5 Ratio
Hi-Lift at half the cost! Race engine practice at street car prices. Using 1.5 ratio high lift rockers has almost become the standard among the racers but at almost $600 for a set of full roller high lift rockers, it's too expensive for most street guys. Mini Mania also has cast 1.5 ratio rockers that are a direct replacement for the stock version AND are half the price. Complete kit includes eight rockers, adjusting screws, four steel pedestals and rocker shaft.

The most often talked about "high lift rockers" are the latest design "roller" type (see C-AHT438), but the main reason "high lift" rockers were designed was to allow easy bolt-on performance without having to disassemble the engine to change camshafts. This performance improvement is achieved with or without the "roller" added option. The standard "high lift" rockers provide a ratio of 1.5 vs. the stock 1.25. (The "roller tip" type also have a 1.5 ratio). This Keith Dodd cast iron rocker set includes rockers and special offset pedestals with high performance rocker shaft!
Produced in the same way and material spec as the 12G1221 'cast' rocker, but to CAD-CAM developed dimensions. This reduces the weight (15% lighter than the stock rocker), whilst insuring optimum strength. This reduction in weight allows lighter valve springs to be used, and extends RPM potential of the fitted spring by some 5%. Valve clearances should be opened up by .003" over recommended settings, although up to .005" can prove beneficial with certain combinations. Using the 1.5 ratio not only increases the maximum lift, but it also means that the valve is open approximately 20% more at any given point- although opening and closing periods remain the same. This vastly improves volumetric efficiency and therefore power output. Also fits the Sprite , MG Midget , and Morris Minor.
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Related Technical Articles:
Classic Mini Cooper Cylinder Head Rocker Assemblies page 31
Created: January 03, 2019
Rocker Assemblies for the 1959 thru 2000 Mini Cylinder heads are available in standard ratio or 1.5 high performance. 1.5 ratio rockers assemblies are cast iron or aluminum with either roller tips only or full roller bearing assemblies. Ask the experts at MiniMania.com
Valve train - Setting valve clearances (lash)
Created: September 30, 2004
A question that has cropped up frequently on the message board lately, and one that I do not ever recall having been set down in print in any magazines, is that of how to decide what the valve clearances should be when changing from the standard rocker gear to higher-lift options. So I thought I wo...
High lift rocker assembly, C-AHT436
Created: January 30, 2000
Ensure that posts, spacers and rockers are evenly distributed along the length of the shaft to allow smooth pivoting. On no account must the valve springs be allowed to become coil-bound as this will place undue stress on the rocker and could lead to failure.
Rocker Gear
Created: January 30, 2000
The new generation of short period, high lift cams have been developed to give the best results in large bore engines when used in conjunction with 1.5 ratio, hi-lift rockers. For the small bore range, the stock 1.3 ratio is optimum. In certain instances ratios of 1.7 to 1 are of benefit - but is really only applicable to fully developed race engines.
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