Knowledge Base
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Results from Similar Hot Road Cams
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Peter |
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Restrict the Oil Return to the tank. Braze or solder a blanking disc of metal over the oil tank return spiggot and drill this out to 3/32". Open the route to the rockers. The small lateral holes in the banjos at the top and bottom of the rocket oil feed tube were drilled out to 1/8" and drilled through to give two routes through the banjo. I went a stage further and unsoldered the copper tube between the brass banjos. I fitted a short length of 3/16" ID brass tube from a modeling shop to the top and bottom banjos which were then connected with flexible oil tolerant tubeing from a supplier of car fuel injection systems. The result was a healthy supply to the top end, checked with transparent tubing again, and no undue oiling symptoms after more than 1000 miles I have a similar arrangement on the cafe racer ES2, running at higher revs. Peter Ashley |
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Peter Ashley |
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Hot Road Cam Comparisons. ES2 / 16H
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Hello Peter, Yesterday ,I had nothing to do but to install a pair of 16H cams on my workhorse (mod50 1956). As I already told you, it's not the first pair I'm trying, but these ones are with Quietening Ramps and it makes all the difference! No more noise (not more than the original"58"cams)but more torque and a more user-friendly engine! I've been told that those cams were original fitment in the end of the 50's. Their profile is between the "58"'s and your Hot Road Cams with almost 1,5mm more lift than"58" and 0,9mm less than Hot Road Cams. The difference is much less noticeable on the MOD50 than on the ES2 which is equipped so for a couple of years. (That is because the Model 50 had hotter cams as standard anyway - Ed) FRED (France) |
Results from Similar Hot Road Cams.
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I have not yet fitted these cams but the ones I have that are very similar in lift and just a few degree different in open and closure degrees, I dyno tested last week The engine is a 84 x 88 based on a 65 degree balance type 50 crank and a B50 84mm piston.The barrel is a 84 mm bore 500T Norton Alfin barrel from Nortons race group back in the 50'sThe head is an early steel scull cap with a 50mm inlet and 44 mm exhaust with a 34 straight through inlet going to a 34mm Mk2 concentric all gas flowed by SRM. The cam followers, push rods rockers have been lightened. It gave 26 hp at the back wheel going through an AMC gearbox, considering you normally loose a minimum of 6 hp in the gear box, and drive that gives an minimum out put of 32 + hp. With a specially machined 3/8 output sprocket to fit a 1/4 chain it maxed at 6200 at 93 mph with a beautifully smooth power curve I would expect your cams to do the same, although this engine is now to be cleaned and sold off under the banner of " done that , try the next engine configuration." Chris Scuse |
79x100 84x100 84x88 86x86 |
Peter Just for interest the previous engines I tested are a 79 x 100 with a 16H piston and 28 mm bore carb did 19 hp at back wheel, a 84 x 100 555 cc with 28 bore head gave 22 hp and the 84 x100 with 34 bore and lightened every thing gave the same as the 84 x 88 480 cc but at 5,500 revs. I predict the 86 x 86 with special head HC piston etc will give 30 -32 bh at the back wheel or 36 to 38 at the fly wheel at 7500 rpm and the 89.9 x 79 to give 34-35 / or 40 + at 8-9000 rpmChris Scuse |
Courtesy of Art Bone Oil leak fix0002.pdf |
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Courtesy of Art Bone Oil leak fix0001.pdf |
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