camshaft core

[fastman]

I'm not certain I'm using the correct area for this question, but here we go. I'm trying to get my TR6 on the road cheaply with a rebuilt engine, my nefew did in the 9 yr old power plant this fall. The faster and cheaper, the more 'left-over' cash and time for the TR8. My question is, for camshafts, is there any difference in duability between a regrind vs. new? Also, besides the drive gear on the shaft, what other allowences can there be for worn lobes etc. I don't want to send off a core that will be rejected.

Henry

[busheytrader]

Hi Henry,

Are you asking about the TR6 camshaft or the TR8 item?

TR6 expertise might be thin on the ground from this website. As for the V8 camshaft there are many variants and suppliers available(From UK experience) It might not be cost effective to have your old unit reground.

Adam

TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, Single Pipe Exh, 3.08 Rear, 200lb Spax & Solid Bushes, Anti- Dive, Granada Vented Discs & Calipers, Braided Hoses, Green Stuff, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 5 Spokes and Cruise Lights. No Door Stickers. Mine since July 1986, V8 from 1991

[fastman]

Thanks for the reply Adam. It is the TR6 camshaft, although all cams should be the same in the regrind regard. Just wondering about the regrinds regarding their duability and the amount of wear that is allowable for a core. Are the lobes just added to regardless of wear, then profiled and hardened? This would mean I only need to send the core in one piece.

[Vegas_M]

Talk to Ted at TSI. He can give you spec's for both a re-ground and new cam. Basically, a regound has had material welded to the existing surfaces, is reground and then heat treated again to re-harden the surfaces. Like everything else today, there are excellent regrounds that are as good as new, and there are the other kind.....[;)]

Best of luck.

Martin

[Underdog]

I've never heard of welding up lobes on a cam. Cores for regrind need to have all the lobes intact. I know for a fact that with MGBs, good cores are really scarce. When the cam is reground, it results in a smaller base circle. After grinding, the lobes should be nitrided to increase hardness. Not all cam grinders do this. APT does and I've had one of thiers in my MGB for years. They now sell mostly new billet steel cams because of the scarcity of good cores. You could check with them. They told me the measurement for an MGB to see if the lobes were suitable for regrind. They also sell TR3-TR6 cams.

72 MGB BRG
80 TR8 Persian Aqua
If women don't find you handsome, they should at least find you handy.

[fastman]

That's what I was looking for. Thanks guys. A new item it will be. By the way, if you didn't know this a TR6 cam runs without bearings! Straight on the block. Of course a line bore and spitfire bearings are a common mod.

[Vegas_M]

Underdog,

Look at the 2nd image on this link. Shows a built up camshaft. Easy to see the extra material. It's how they build up or fix damaged camshafts.

http://www.taylor-eng.com/xu9j4/16v_camgrinds.htm

Regards,

Martin

[Underdog]

Interesting. First time I heard of that procedure. I know Isky, APT, Comp Cams ect. don't do that. I know crankshafts can be welded up but never heard of anyone doing cams. They do mention it being cost prohibitive in relation to a new billit. Perhaps why the big guys don't bother?

72 MGB BRG
80 TR8 Persian Aqua
If women don't find you handsome, they should at least find you handy.

[Wayne S]

Usually in the UK these days a new cam is cheaper than or equal to a re-ground cam, especially when you only have the one to worry about. If you have a 125 BHP later TR6 then it might be an ideal opportunity to put in the more powerful earlier cam from the 150 BHP TR6 and TR5.



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