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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #71  
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Default Sifton HH .475

Quote:
Originally Posted by Ferrous Head View Post
OP is running 4 - 5/8ths wheels, so not a stock engine.

Yes, probably about the best all around cams for the stock 900 ch is the P. But the HH's I ran in my first sidecar worked pretty well I must say.
... Agreed , my 66 XLCH had HH with R Valves, that engine ran Great
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  #72  
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Cam events do not produce air or exhaust flow.
These are the result of pressure differentials in the engine, generally caused by piston motion and combustion.
If the cam is well suited to the engine tune and use, the cam will open the appropriate valve just in time to allow the differential to transfer air or exhaust from high pressure to low.
As FH said, "Not enough is not good and too much is not good". Opening the valve before the pressure exists does nothing (and may allow flow in the wrong direction), leaving the valve open after the flow has stopped also. Not opening the valve soon enough and/or closing it while there is still pressure restricts power.

Everything is a compromise.
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My late friend Steve had a 63-64? with just a set of barrels, stock stroke. With P cams and a DC at Sears Point, he would turn 11.80s.

I looked at the new HD Pan American specs. 76" 4"+ Bore Under 3" stroke, like a Ducati or KTM. Torque peak at 6700 rpm. Quarter mile 12.00 125? A pure race engine 150 hp disguised as a scrambler. I can't imagine that it would do well on the street. One of Gene's strokers would eat that up until top of 4th gear.
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  #74  
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It's all based on physics and those laws don't change.

If you look at the cam specs for a Manx Norton, a GP Triumph, a G50 Matchless or an Andrews X grind you'll find very similar numbers. Never checked but I suspect full race Chevy engines will be much the same. Even the factory Desmo Ducati's although lift is higher and LSA's are farther apart, run similar numbers.

But these are pigs to try and ride slow. You ride back to the pits mostly with the clutch in.
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Default

It's all based on physics and those laws don't change.

If you look at the cam specs for a Manx Norton, a GP Triumph, a G50 Matchless or an Andrews X grind you'll find very similar numbers. Never checked but I suspect full race Chevy engines will be much the same. Even the factory Desmo Ducati's although lift is higher and LSA's are farther apart, run similar numbers.

But these are pigs to try and ride slow. You ride back to the pits mostly with the clutch in.
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I recall the first engine that I saw with this big bore/short stroke was the Ford 302. 4X3 the wedge head made it possible. When I first looked at the Pan Am HD numbers I thought of one of your stroker engines out running that thing at the drags. They had to have a stump puller gearing to be able to ride this thing on the street. Fancy MPH shows the HP of the engine but meanwhile that stroker has pulled away and left.
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  #77  
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Been running sifton, 202 hustlers cams in my 83,,, -h exhaust +h intakes in my stock 1000 for a few years now,, Very easy on the starter,, starts first time ,every time,,I put on a stock oem cross over pipe on about a month ago with some oem 82 mufflers ,drilled a 3/4 hole dead center in the baffle plug ,,,combinded with the super b carb,, 29.5 ind jet 68 main and the ultima ignition and a voes,,,The bike is very responsive,, really a blast to ride,, too bad there,s not alot of info on the sifton 202 hustler cams ,,,,,,, IMHO i think those cams are a great street grind for a stock 1000,, thks cazz
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