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Old 05-29-2012, 11:37 AM   #1
Frank D
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Default Triumph 650 Cam/Tappet Dilemma

I'm building my 1967 T120 motor right now and have run into a snag. My motor has the oil port that is meant to deliver oil through the cylinder jugs to the tappets but my jugs don't have this.

A few threads that I read said that it was ok to just block off the oil passage (just like people do for Morgo big bore kits). Unfortunately, the one detail I missed was that this is only ok when using later style nitrided cams and tappets.

So...what do I do now. Do I need to pull my motor apart again and buy new nitrided cams and tappets? OR has anyone successfully eliminated the oil passage in the block while still older style cams and tappets that are not nitrided?

I will go to the shop later and check the exact cam that I have but I am pretty certain they are not nitrided. I just needed to post this because it is keeping me up at night!

I will post some pictures this afternoon

Thanks
Frank
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Old 05-29-2012, 11:52 AM   #2
Frank D
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Default Re: Triumph 650 Cam/Tappet Dilemma

I doubt this helps but here is a picture of the cams in place before I closed the cases and assembled the transmission

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Old 05-29-2012, 02:25 PM   #3
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Default Re: Triumph 650 Cam/Tappet Dilemma

a lot of discussion on this subject, obviously there has been many Morgo kits put on 65 through 68 Triumphs before and lived to tell about it, yes some cam wear will happen but other factors come into play, like the condition of your cam followers, cam lube on break in and the engine oil you run.
Bottom line try it and see what happens, after all many of the nitrate hardened cam were not done that well anyway,The Megacycle cams are hardened better than stock ones were.
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Old 05-29-2012, 06:03 PM   #4
Frank D
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Default Re: Triumph 650 Cam/Tappet Dilemma

Thanks for the reply Tony!

One more question. After I block off the tappet oil feed at the top of the cases is there anything else that needs to be done? For example, should I remove the needle/valve located on the timing side. I am assuming that this is what normally regulates how much oil is fed to the tappets.
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Old 05-29-2012, 08:47 PM   #5
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Default Re: Triumph 650 Cam/Tappet Dilemma

Quote:
Originally Posted by Frank D View Post
Thanks for the reply Tony!

One more question. After I block off the tappet oil feed at the top of the cases is there anything else that needs to be done? For example, should I remove the needle/valve located on the timing side. I am assuming that this is what normally regulates how much oil is fed to the tappets.
nothing else needs to be done after blocking off the hole. I just use a piece of round aluminum rod a 1/4" long to block off the hole,
I think you are referring to the oil pressure relief valve, it regulates the maximum oil pressure going to the engine, just leave that alone.
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Old 05-29-2012, 10:28 PM   #6
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Default Re: Triumph 650 Cam/Tappet Dilemma

A lot of Triumphs before 1965 survived without an oil pressure feed, or nitrited cams. Don't worry about it and like Tony said use some good motorcycle engine oil and it shouldn't be a problem.
The oil metering tube/jet is 1967 only for the one year only exhaust tappets with a large oil cutaway. If the oil passage is blocked it won't matter if you remove it or leave it in. It is now regulating nothing.
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