Engle K13 Cams, Anyone using them?

I just recently bought a set of engle K13 cams (262 duration, .410 lift and 110 lobe center) for my 73 Z1 which has a 10.5:1 1075 with a mildly ported head and rs34 carbs. I checked the lift several times and it's actually .415 lift. The cam specs are close to the APE 410 cam which has 266 duration and .410 lift. I'm a little concerned about using shim over buckets, I don't mind clearancing the head, I just don't want to throw a shim off. So is anyone on here using either of these cams or even bigger with stock buckets? I have some Andrews 2x cams as well but I'm thinking the bigger ones will be better
thanks

I may be able to give some info, on your K-13's.

This is a Bracket Racing Cam. It has good power above 6,000 rpms in a light weight bike.

1st. the right specs:

300 degrees - intake and exhaust Duration.(262 @.050")
.410" Intake and Exhaust Lift.

109 - intake lobe center
111 - exhaust lobe center

110 - LSA

22/60 intake timing
62/20 exhaust timing

42 - Overlap

Now for the 10.5 CR that you have. Yes it will run very good, at that Cr. However....welcome to the slippery slope. Without your motor having any milling (cylinder, cases, head) and with the stock thickness head gasket and base gasket, you are sitting at about 175 psi. Depending on your state and octane, that's thin ice. At least in my book.

I have used both the K-12's and K-13's over the years. I can tell you that the Rs34's, are way to big for those cams. They work best in the 29mm-31mm carb range.

As for the stock buckets, not a problem. Stay on top of your valve adjustments! I use .004" valve clearance, for the intake and exhaust.

The Andrews 2x is a nice performance increase. The K-13 is a racing cam! I hope you think this, through.

PS- Never compare the K-13 to an APE cam or any other. It stands it a world, all it's own.

Good luck with your project.

vintagerider wrote: I just recently bought a set of engle K13 cams (262 duration, .410 lift and 110 lobe center) for my 73 Z1 which has a 10.5:1 1075 with a mildly ported head and rs34 carbs. I checked the lift several times and it's actually .415 lift. The cam specs are close to the APE 410 cam which has 266 duration and .410 lift. I'm a little concerned about using shim over buckets, I don't mind clearancing the head, I just don't want to throw a shim off. So is anyone on here using either of these cams or even bigger with stock buckets? I have some Andrews 2x cams as well but I'm thinking the bigger ones will be better
thanks

IMO, you're boarder line for S.O.T. buckets.

How do you realistically ride the motorcycle?
What are you willing to sacrifice to gain something else?


It will pull significantly harder from 4000RPM on up with the K13's than the 2x will.

The 2x is a nice street cam for a 1075cc moderate compression motor like yours. You get the civility of the stock motor with a considerable increase in torque through the middle without needing anything other than a good set of .440" springs.

If you want to run the K13's, just be aware that below 4000 it won't be as crisp because of the duration. They want RPM to really shine. Give 'em that and that's exactly what they'll do

PS... a buddy of mine recently picked up an old set of Andrews conversion buckets on Ebay. First set I've seen in decades. They allow you to use S.O.T retainers but have S.O.B. shims. I guess they're still out there..... a possible solution if you can find 'em.

Your RS34's will work just fine with either grind. Keep 'em.

Larry C

Thanks alot for all of the info. As for my riding style, it seems like the 2x cams will probably suit my needs better. The bike will likely never see the track, just the street. It isn't a daily rider or anything, but at the same time I don't want it to be tempermental, and hard to ride at lower rpms. I rode the bike last year with the 1075, stock cams and 29mm smoothbores, and it ran pretty decent, for the first 10 minutes or so of riding, then it ran like crap everytime. Tore it appart this winter and found #3 intake valve slightly bent, don't know what happened, no marks on the piston. Anyway, just figured while it's appart I would upgrade, but I don't want to regret any decisions and tear it appart again. So I'm 90% sure I'll use the 2x cams instead. Should I use stock sprockets, or do I need go use slotted sprockets and degree them, with either set of cams?
thanks alot

vintagerider wrote: Thanks alot for all of the info. As for my riding style, it seems like the 2x cams will probably suit my needs better. The bike will likely never see the track, just the street. It isn't a daily rider or anything, but at the same time I don't want it to be tempermental, and hard to ride at lower rpms. I rode the bike last year with the 1075, stock cams and 29mm smoothbores, and it ran pretty decent, for the first 10 minutes or so of riding, then it ran like crap everytime. Tore it appart this winter and found #3 intake valve slightly bent, don't know what happened, no marks on the piston. Anyway, just figured while it's appart I would upgrade, but I don't want to regret any decisions and tear it appart again. So I'm 90% sure I'll use the 2x cams instead. Should I use stock sprockets, or do I need go use slotted sprockets and degree them, with either set of cams?
thanks alot

Smart Choice IMO..

Ideally, you would degree them. Andrews wanted a 104 lobe center. They work just fine on stock sprockets with a good tight cam chain though. If I was going to degree them with our shit gas we have now, I'd put them on 106 - 108 centers.

You can Ebay the other cams. Ask $150, you'll get it. They're worth if if they're in good shape.