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Distributor-Less Camshaft


Rocan

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Anybody ever seen one or made one? A lot of people run crank-trigger ignition. Clearly this would mean the cam could only be used in a crank fire m10, but it would also mean a lighter, better balanced cam, and that the distributor housing could be blanked off. Only issue I see would be having to find a place to hook up the oil pressure sender, but that is a piece of cake. I figure 5 minutes on a lathe with a parting tool would do the bulk of the work and a few more minutes with a bandsaw, scrap aluminum, and some bolts with gaskets would take care of the rest of the job, then just tap the new cover for the oil pressure sender. The weight isn't much, but every bit counts, especially if you are going for high revs. 

 

Thoughts?

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

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Honestly, not worth the effort, unless you like the 'smooth' look.

 

The cam's turning half crank speed, and it weighs about what ONE

crank counterweight weighs.

 

On top of that, a parting tool can take half your head off when it binds on something-

which they seem to do just to be a pain in the butt.

 

But I DO think the smooth look (and lack of crap on the back of the head) might be nice

just in the 'because it looks better' camp.

 

Kind of like taking the heater air 'box' off the race car made it loads easier to work on.

 

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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I figured that it wouldn't be a big deal (though the smooth look IS nice :) ), but I am curious just how much that bit weighs. camshafts weigh quite a bit, and although they only turn at half crank speed, 3500rpm is still very fast and since people go to such great lengths to reduce inertia, why not hack off the bit that you don't use? 

 

Hmm, now I'm thinking I should find a gunsmith and have him bore the center of the cam, then drill the unloaded sides of the lobes and with a dry sump system run oil straight through the cam using the back side of the head. Reduced wear, reduced weight... only negatives would be cost. 

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

A bunch of Bikes...

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Don't waste your time on the cam. Cut the counterweights of the crank.

Edited by allbim

No amount of skill or education will ever replace dumb luck
1971 2002 (much modified rocket),  1987 635CSI (beauty),  

2000 323i,  1996 Silverado Pickup (very useful)

Too many cars.

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Don't waste your time on the cam. Cut the counterweights of the crank.

can you recommend a good machine shop to knife-edge/ and balance a crank? Anyone who takes stock cranks and strokes them out?

 

Surely getting the work done would be cheaper than buying a new stroker crank outright.

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

A bunch of Bikes...

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Dunno where you are, but Johnnie at Autosport Seattle has someone who does it.

 

Yah, seriously, pick up a crank in one hand and a cam in another.  Then hold them by their

ends and try to twist them.

 

You'll set the cam down and start sawin' on that crank!

 

heh

 

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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Hey... every bit counts! 

 

One of these days I'm going to hack up a cam and throw it in and see what difference it makes... I just need to get a damn lathe already ;)

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

A bunch of Bikes...

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That is some pretty work. Anyone have some figures on the weight reduction on a street grind knife edge? I've worked with honda CB350 motors and know of people who have cut half the weight off stock cranks with no adverse effects. I figure the m10 bottom end is so overbuilt that there is a good bit of weight to be shed. Combined with an aluminum flywheel it should be a hoot!

Also I'm on the east coast... I don't mind shipping if the price is right though. Anyone have some actual cost numbers?

Edited by Rocan

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

A bunch of Bikes...

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