Tappets & Cams - Harley Davidson Forums: Harley Davidson Motorcycle Forum

bikedelic · 11-13-2012, 07:16 AM

Anyone ever use or know good or bad about RevTech tappets for an Evo engine?

Also, are there any distinguishing marks on stock Evo cams and aftermarket cams that I may be able to tell what's in there? I presume it it stock because nothing looks like it has ever been taken apart before and the stock pushrods were in there.

Dave63 · 11-13-2012, 07:34 AM

I prefer to stick to OEM or S&S. Tappet failure in an Evo is usually detrimental to the engine. Not always, but usually.

Stock Evo cams have a ring around the gear face. That's how you know if they're for an Evo, and not a shovelhead.

Stock cams have painted dot on them. The color determines the gear tooth pitch, in conjunction with the pinion gear on the crank.

Stock cams will have the cam model number stamped on it, IE: 1990-1999 will have "N" stamped in it, meaning it's an "N-Grind" cam. Prior to that was an "L" grind cam.

bikedelic · 11-13-2012, 08:31 AM

It was late when I pulled the cover off. I need to go back and have a look. Right now, I'm sitting in a Jury Room waiting... to be called or not.

Ray-zer · 11-14-2012, 08:19 AM

Quote:

Originally Posted by bikedelic

It was late when I pulled the cover off. I need to go back and have a look. Right now, I'm sitting in a Jury Room waiting... to be called or not.

When they interview you just say that you'll be a perfect jury member because you can tell if they're guilty just by looking at them.

That'll let you get to go home early

butch61 · 11-14-2012, 12:05 PM

don't like anything rev tech IMHO

Dave63 · 11-14-2012, 02:14 PM

Tell them you think OJ is guilty. District Attorneys love that........ Defense Attorneys do not....

bikedelic · 11-14-2012, 02:38 PM

I never got called from the juror pool - just had to sit there all day. I liked Ray-zer's suggestion and I can easily visualize someone really saying that! If I did get called, I would have fulfilled my civic duty. I would want good people on my jury if I was on trial.

I did get to take another look at my cam. It is a stock L grind, red dot - standard size gear. The L is stamped on the back of the rear lobe. It is a '91 but it says L, plain as day. The CV carb also has a sticker with a 90- part number on it. Must be an early "91

Dave63 · 11-14-2012, 02:48 PM

Yep. L-grind. L stands for the LEASET power producing cam HD ever installed in an engine.

I heard you can gain 5 horsepower just by taking it out......and leaving the cam chest empty.

**misinlink** · 11-14-2012, 02:56 PM

Quote:

Originally Posted by Dave63

Yep. L-grind. L stands for the LEASET power producing cam HD ever installed in an engine.

I heard you can gain 5 horsepower just by taking it out......and leaving the cam chest empty.

L- lazy... 5hp just on removal... sweet!

bikedelic · 11-14-2012, 02:59 PM

Dave, I thought you liked the L over the N and the L was close to an EV27?