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Morris Minor rocker assembly 1.5 hi lift forged rocker

Morris Minor rocker assembly 1.5 hi lift forged rocker

Morris Minor rocker assembly 1.5 hi lift forged rocker
Qty:
Internet Price $289.95
Part No: C-AHT436
Internet Price $289.95
Alternate Products
Morris Minor Cylinder Head Roller Tipped Rocker Assembly 1.5 Ratio
$459.95 Morris Minor 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.

SPECIFICATION: Material is drop forged EN16 with the valve pad face hardened to 52.5-55 on the Rockwell  C scale. RATIO: Rocker ratio is 1.5 as opposed to 1.25 of the standard rocker.

TAPPET CLEARANCE SHOULD BE 3 THOU MORE THAN STANDARD. ON REALLY HIGH LIFT CAMSHAFTS AN EXTRA 2 THOU AGAIN MIGHT BE BENEFICIAL.

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.

At least 0.100" should be present between full valve lift and spring crush, or 0.030" between each coil of spring at full valve lift. The advantages of this assembly are similar to fitting a higher lift camshaft, but without the ordeal of stripping the engine. Only the knowledge of adjusting tappets is required. The valve actually opens and closes at exactly the same point, but the valve is open by about 20% more at any point on the camshaft lift curve which promotes airflow, accentuated when used on a high cylinder head.

WARNING This Hi-Lift rocker assembly does not appear to work well with the old meteor range of cams from Kent Cams or the Magnum range from Pipers, which are both special types of cams. They are however, designed to work with the Megadyne Kent cam range.

CHECK The adjustable nut is AF spanner size as opposed to the standard Mini size of 7/16 AF on pressed rockers. The 1300cc range and  S forged rockers are AF.

PART NUMBERS Adjusting screw - AEG167. Nut - NT605061.



 
 
Question:
I have a 1275 engine with a Kem Cams cam. This rocket warns that there may be engine performance problems. There is another cam with the characteristics of this one that does not have that problem?
Answer:
Please provide us with a little more information. We have not heard of a 'Kem' camshaft, could it be a 'Kent' camshaft instead? There are a number of different camshaft form Kent- most all of them have a part number engraved on them. Do you have a part number?  

Also not sure what the "rocket' is or what the warning says- can you explain further.

QUESTION 2 - I have a mini cord year 1992 (made in venezuela). It has a 998cc engine block and a 1.3 chamber. Additionally you install a Kent Cams MD266 Slot Drive-Fast Road. I am interested in adding a Classic Austin Mini cylinder head roller tipper roxker assembly 1.5 ratio. I wanted to know if: 1) Does the motor gain more power? and 2) If I can have problems Finishing by the cam, what do I already have installed? Thank you, and sorry my English is not good. 

ANSWER 2 - Roller rockers on a 998cc engine with MD266 camshaft will provide a light increase performance in the mid RPM range.  You should have no problems in fitting the rockers to your engine.
 
 
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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
BMC A-Series 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...
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.
Customer Reviews:
 
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6 of 8 other people found the following review helpful
 
Cheap and screamin'
By:
Tony and Jemal put these on my 1330 rebuild along with the Pierce big-valve aluminum head, MM103 cam and Hepolites. Just compared to the stock rockers I don't know if you'll notice a difference other than the car wants desperately to soar to the higher rev ranges once you're at 4000 or so. It is like a big electromagnet pulling you forward. My HIF44 wanted a new jet to match as a result, and that is pretty much a requirement as well. Check with MM about the jet. I have set it at 0.013" and it ticks slightly, but based on the tech article here and otheres it looks like some experimentation is in order. It is holding the setting better than the stock rocker. It also has end play like the stock rocker but nothing to worry about.
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