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| Roller Cams https://www.slantsix.org/forum/viewtopic.php?t=4484 |
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| Author: | DusterIdiot [ Wed May 25, 2011 7:52 pm ] |
| Post subject: | Yep... |
Quote: I am pretty sure the Cox Brothers went out of the Slant parts business.
I heard they did, I think their sheet metal company took a major hit during the recession in the midwest, last I had talked to them quite a few years back they had a couple of blanks on the shelf, but don't know what happened to them...there are a couple of cores floating around that are stashed away...note these did not have an oil pump gear/distributor gear on them so you'd have to move to DIS/Crank trigger and an externally driven oil pump.A few Pac NW guys got the skinny on another way of doing this at one of our local races... All truth told, it's better to get the most out of the mods of your engine build and run a solid bump stick, then go to the roller to get that last bit after wringing everything out of the other stuff... -D.Idiot |
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| Author: | stuntmanmike [ Thu May 26, 2011 1:57 am ] |
| Post subject: | Roller Cam DIY |
My apologies for resurrecting this subject if it's a dead-end issue. I'm chasing thermal efficiency and reduced friction for the most reliable power limit with running a salt lake racer using a modded 225 with roller components. I'm just doing things the hard way... Thanks for the info folks. |
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| Author: | USAJon [ Wed Jun 01, 2011 2:50 pm ] |
| Post subject: | |
can billet material be used..I think thats what crane uses on V8 cars..how much can that cost say per 10 units ? then custom ground |
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| Author: | Doc [ Wed Jun 01, 2011 3:22 pm ] |
| Post subject: | |
The Cox boys made 20 out of billet and they cost $700 each... and still needed finish grinding.  Those steel cams did have the oil pump drive gear hobbed onto them and they were heat treated 8620 material. I still have a raw 8630 cam casting that still needs all the machining / grinding, that single protype casting cost me $200.00 DD |
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| Author: | USAJon [ Wed Jun 01, 2011 3:50 pm ] |
| Post subject: | |
OK I called an old school cam grinder I used in 1981 for Harley regrinds in Calif. they are auto peeps. he quoted me billet was $500 X 10= $5K from his supplyer slant six then $125 each to grind It would be good to know all it needs to R&D a final cost quote, even if it does not pan out affordable..thanks |
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| Author: | runvs_826 [ Wed Jun 01, 2011 8:57 pm ] |
| Post subject: | |
$500 for a blank seems like a really good price. Since my dad bought a lathe two years ago and we have started playing with it I was putting together a plan to attempt some blanks. No doubt finishing will be needed, but $125 seems a little high???? |
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| Author: | DusterIdiot [ Thu Jun 02, 2011 5:26 am ] |
| Post subject: | That's about right... |
Quote: No doubt finishing will be needed, but $125 seems a little high????
For having a profile ground on a billet blank that's about right when compared to Comp,Erson, etc...(that's about the price OCG charged to have a "test cam" ground on a standard blank)-D.Idiot |
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| Author: | CNC-Dude [ Thu Jun 02, 2011 5:33 pm ] |
| Post subject: | |
Quote: $500 for a blank seems like a really good price. Since my dad bought a lathe two years ago and we have started playing with it I was putting together a plan to attempt some blanks.
Keep in mind that what you are producing on a manual lathe is called a "round lobe" blank, and will require much more finish grinding work by the cam grinder than just a normal regrind typically done on an already finish ground camshaft. I can make billet blanks that are also "round lobe" style and most camgrinders I have spoken to about finishing these cam blanks have quoted between $250-400 bucks to do it. With a manual lathe, you have no way to make anything but a round lobe, you don't have any way to cut or create the eccentric shape of the lobe found on a camshaft. Some lobes will require as much as .500 of material to be ground off of the heel portion of the lobe, while the nose may only require less than .050 of material to be removed to finish grind. If you were quoted $125 to finish grind a cam blank, you better shake on it before he changes his mind and realizes what all is involved to finish one of this type. Plus the cam will also have to be copper plated and heat treated as well. That was also included in the $250-400 bucks I was quoted, but does not include distributor gear hobbing, or any keyway cutting or dowel pin hole drilling or bolt hole drilling or tapping.
No doubt finishing will be needed, but $125 seems a little high???? |
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| Author: | Doc [ Fri Jun 03, 2011 8:06 am ] |
| Post subject: | |
As noted before... hobbing the gear in the center of this long cam... with lobes right next to the gear, is the most challenging part of the process. Machining the OP drive gear on a SL6 cam takes a special machine and tooling. DD |
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| Author: | runvs_826 [ Fri Jun 03, 2011 10:01 pm ] |
| Post subject: | |
Yeah I'm aware of the round versus cam lobe and such. I just thought it was less than $100 to do the grinding part of an actual cam. Maybe it differs on region and such, and it was 4 years ago I'm basing the price on as well! Yeah, I know the challenge on a slant cam is the gear drive off of it, so $500 for a blank is really good price! |
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| Author: | Joshie225 [ Fri Jun 03, 2011 10:11 pm ] |
| Post subject: | |
To regrind a stock flat tappet cam with pre-finished lobes you can get it done for $70 at Oregon Cam Grinding. The time it takes to finish the lobes from round is much longer so it costs more. Call Oregon Cam Grinding and ask Ken what he charges to finish a round lobe cam. |
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| Author: | USAJon [ Tue Jun 07, 2011 2:58 pm ] |
| Post subject: | |
Quote: To regrind a stock flat tappet cam with pre-finished lobes you can get it done for $70 at Oregon Cam Grinding. The time it takes to finish the lobes from round is much longer so it costs more. Call Oregon Cam Grinding and ask Ken what he charges to finish a round lobe cam.
I just called them and asked if they could grind a cast one for a roller , the person I talked to said they have, and a member on this forum has been running it for 2 years..so.... |
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| Author: | runvs_826 [ Tue Jun 07, 2011 3:20 pm ] |
| Post subject: | |
Hum, about two years ago i had asked them all these questions. It was cheap for them to grind me a profile I just needed a good blank. They wouldn't take a "round" lobe as a blank either, which I didn't think that qualified as a blank anyways. So what is the current word? |
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| Author: | USAJon [ Tue Jun 07, 2011 3:31 pm ] |
| Post subject: | |
Quote: Hum, about two years ago i had asked them all these questions. It was cheap for them to grind me a profile I just needed a good blank. They wouldn't take a "round" lobe as a blank either, which I didn't think that qualified as a blank anyways. So what is the current word?
I asked if they could take a "used" cast slant six camshaft and grind for a roller..the person I talked to said they have done two. One person on this forum has been running it for two years..the other person never got back to him...so... |
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| Author: | runvs_826 [ Tue Jun 07, 2011 4:25 pm ] |
| Post subject: | |
really??? I thought that would be impossible, learn something new everyday. I have a couple cams that would be very interesting to me. I know Doug had a mold ready for pouring roller cams I thought?? |
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