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Tractor Pulling Discussion Forum

how small is too small camshaft diameter in stroke

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ac.rt

05-28-2006 13:02:05

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first of all how small of diameter in a solid cast iron camshaft thats not drilled hollow for oil . is too small on a four cylinder engine with .stock valve springs . whats the smallest and it still have strength enough too hold up looks like to clear my rod cap bolt heads .im going to be at .485 o.d. isn,t that a little too small . sure looks it . also what does the term slabbing the camshaft mean rather than chucking it up in a lathe . and clearing out a wide enough area for them too clear. also what is the diference in arp rod cap bolts . how expensive are rods custom made with the rod caps offset .and were do you buy these arp rod cap bolts . thanks new stroker .

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Drew

05-28-2006 15:21:57

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Re: how small is too small camshaft diameter in st in reply to ac.rt, 05-28-2006 13:02:05

The absolute worst thing you can do is chuck the camshaft in a lathe and turn it down. Im guessing when you mention "slabbing", you are talking about grinding flatspots on the cam instead of cutting it down round. This is the method that you want to use, much much stronger than just putting it in a lathe. You will want a nice sized radius at the ends of your flats and not a sharp corner.

The ARP bolts are a much higher tensile strength than a stock bolt. The ARP "8740" type bolts are 180,000psi tensile and the "ARP 2000" type bolts are 220,000psi tensile. Murphy's Motor Service can get you ARP bolts.

The price of custom rods highly depends on what size of material and how long the rods are. What is your application and what rod bearing are you using?

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ac.rt

05-28-2006 16:33:42

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Re: how small is too small camshaft diameter in st in reply to Drew, 05-28-2006 15:21:57

the rod cap bolts is what im having problem clearing could i have them countersunk.i,ve never cleared a camshaft before .are u saying make a v notch like a valley for the bolts to clear . why is a lathe the worst thing you could do. do u use a grinder or carbide cutting bits . on a pnumatic die grinder. then how small is too small the cam started out at a full inch an and eighth. im using an old camshaft to experiment with .before i use my new ground cam. i just want to do it right thanks any help would be apreciated

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Drew

05-28-2006 17:42:25

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Re: how small is too small camshaft diameter in st in reply to ac.rt, 05-28-2006 16:33:42

You dont want to put it in a lathe because you needlessly lose a ton of cross sectional area. A 1.125" round cam core is .993sq.in. If you grind flat spots 180* apart where your rod bolt hits and make it your .485" thick, you go to .528sq.in. A .485" diameter round cut in a lathe is a whopping .185sq.in. of cross section. So flat spots vs round gives you about 2.85x the cross section area.

I dont know what kind of cam you are working on, but a grinder will be your best bet. I tried to clearence a Deere shaft in a CNC machine with an inserted carbide mill..... that didnt work. The camshaft core was too hard. When you are grinding, take it slow, do a little at a time. Do not get the camshaft too hot, it can warp and lose strength. If you turn it blue from grinding heat, THAT IS BAD.

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Mopar-Harris

05-30-2006 16:46:45

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Re: how small is too small camshaft diameter in st in reply to Drew, 05-28-2006 17:42:25

The best way to do it is in on a mill with an indexing head. Yes, you run in to issues due to hardness, but call up Travers and order a 3/8" diameter cutter designed to cut up to 55 Rock hardness. The one I bought had a radius on the edge as well.

Email me if you want more details.
Pete.

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