This camshaft has been designed by Mini Mania for use in "A" series motors that have forced induction. These motors work best with a camshaft that is optiomized for the proper overlap and timing for a 'blower' induction system. 110 degree lobe centers.
With a checking clearance of .050", the intake opens at 11 degrees BTDC and closes 51 degrees after BDC. The exhaust opens at 51 degrees before BDC and closes 11 degrees after TDC. Duration at .018 lift is 284 degrees.
Overlap is 22 degrees at .050". Duration is 242 degrees checked at .050" and/or 248 degrees at .018"
This is a classic hot street camshaft grind from Dema Elgin, ideal for the Autocrosses or occasion track days. Best performance is achieved with a uprated cylinder head but will work great on a stock cylinder head with 1.4" intake valves. Improved RPM midrange performance will be most notable.
235/235 DURATION @ .50 CAM LIFT
.290/.290 CAM IN/EX
VALVE LIFT 1.25 ROCKERS 363/393
VALVE LIFT 1.50 ROCKERS 435/435
9.5:1 COMPRESSION REQUIRED
Dema Elgin earned his reputation for high performance design and manufacture of camshaft from extensive personal racing history. This full race 306 degree duration camshaft is one of his best developed cams for the Vintage Racer that is looking for the best. The power band for this can clearly depends on compression ratio and intake/exhaust systems but is designed to work best between 4000 and 7500 RPM. It should be used with at least 13:1 compression and dyno tuned to meet your expectations. The intake valves open at 49 degrees BTDC, closes at 91 degrees ABDC, the exhaust opens at 81 degrees ATDC and closes at 49 degrees ATDC. Lobe center on this cam occurs at 106 degrees. With stock ratio rockers the valve list is .427" while with 1.5 ratio the resulting lift is .513". These cams are ground on very special cores that have been cross drilled for improved oil flow and longer life of the cam and followers both!
Considerable information has been recorded about numerous aspects of the four stroke internal combustion engine. Nevertheless, only a small percentage of people really understand how it works and even fewer still know how to modify an engine to suit their needs. I will try to simplify this complex subject by discussing some basic principles that may be overlooked or misunderstood by the average person. First, it is very important to understand the relationship between piston travel directions and valve timing events. The reason this relationship is important is because it is one of the few things that is relatively easy to adjust/change. The camshaft which opens and closes the valves makes ONE complete revolution (360 degrees) while the crankshaft moving the piston up and down the cylinder rotates TWICE (720 degrees). Camshaft timing is usually expressed in terms of crankshaft degrees relative to the piston location in the cylinder. That is, relative to Top Dead Center (TDC) and Bottom Dead Center (BDC), respectively. Note that during the four strokes of a piston in an internal combustion engine the crankshaft will rotate 720 degrees and the piston will be at each TDC and BDC twice.
With Supercharger, this is a beautiful cam for a well built engine
Despite its 286 degree spec., this cam idles like a kitten with supercharger and then comes on like a tiger once the throttle is depressed. For the classic Mini a supercharged 1380cc engine pulls out of the hole in an "OH MY GOD" way that will leave your wig in the back seat unless you have it firmly glued down.
I have no idea how this cam would work in a naturally aspirated engine, but other than idle I suspect that it would be equally thrilling. In a supercharged configuration, despite the overlap, the supercharged overfilling of the chambers causes a very smooth idle, as if a very mile cam. Then, depress the throttle and realize why you are wearing your seat belt (so that you are not thrown into the back seat).
Elgin did a great job of enginerring this cam way back when supercharging or turbo charging Minis was big news. IT STILL IS!! Trust me, this cam along with supercharger produced race engine HP, but with docile road manners. Beautiful !! Happy Motoring! Please save up for your next set of tires when ordering this cam. I advise for general motoring at least a 3.1 x-pin diff or higher. If you are into autocross and have enough induction system, this is a great cam for sure.