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  #1  
Old 2 Weeks Ago
Staffords Staffords is offline
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Default Y Grind cams in a 900

In the process of rebuilding a 61 XLCH as a fun rider for backroads, both paved and unpaved. Stock stroke, +.030 forged TRW pistons, magneto ignition, 19t engine sprocket, ported heads, bigger valves (1.937"int, 1.75"ex, by Flo Headworks).

To my surprise, the camchest contains pretty new looking Andrews Y cams. After reading through the Chevelle's entire thread with dyno run comparisons http://xlforum.net/forums/showthread.php?t=1222275 I was expecting to find worn stock P cams and hoping to replace them with R5 cams. Chevelle's findings seem to point at the R5 cams for the most power over the widest rpm range. I don't believe he compared Y cams in this thread, but what I got from it was P cams were best for a stock 900 motor and R5 gave the most usable power over the cams compared with just a little headwork and exhaust tuning.

Then read through Ferrous Head's post about using Y cams in a sidecar racer ( 3" bore but 4&1/2" stroke making it approx 1030cc or 63ci) and that bike was cranking out almost 90hp!http://xlforum.net/forums/showthread.php?t=1656934

Do you think my engine combination can take advantage of the Y grind cam lift and duration even though it's just a 900? Or do you think staying closer to stock with the P or R5 cams is the way to go? I also can't seem to find R5 cams for the pre-71 sportsters in stock anywhere....

Looking for input from the experienced builders and racers. What would you run?
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  #2  
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ericfreeman ericfreeman is offline
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Default

From my experience with both R5's and Y's, the Y's need compression to work well. I have them in my relatively stock '77 XLT (better carb/exhaust) and I didn't notice much of a difference from the P cams. But when I had to replace the pistons and went to Wisecos, the power was definitely better.

I have R5's in my built '78 (carb/exhaust, FLO Headworks heads with porting, big valves and dual plugs, along with Wiseco's) and this combo really rips. Much stronger than my '77 and a blast to run through the gears.

See if you can figure out your compression with those TRW slugs and go from there.
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1978 Anniversary Edition XLH. Wiseco 10:1 forged pistons, Andrews R5 cams, dual plugged heads with Super Port Flow, single fire ignition, Mikuni Solex 36 PHH carb, Jagg oil cooler, '73 gauges, kickstart, Barnett kevlar clutch, Progressive front springs, Hagon Nitro shocks, all-Andrews tranny. 1977 XLT, Mikuni Solex 36 PHH carb, tapered dual exhausts, Andrews Y cams, Progressive front springs, Hagon Nitro shocks.

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  #3  
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i would keep the Y.they're milder than the R5.
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Quote:
Originally Posted by brucstoudt View Post
i would keep the Y.they're milder than the R5.
The Y cam has less lift than the R5 cam but longer duration, right? If I understand things right, longer duration shifts the powerband higher up on the RPM range, sacrificing rideability in favor of peak horsepower.

My heads have the work done to handle the extra lift of the R5 cam.
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I would happily stick with the Y cams you have in there already.

It's very easy to put too much cam into a street engine. And it makes them harder to ride properly, that's about all.

Hd really were pretty much on the money with the mid 60's XLCH's. They can be fun to ride and pretty reliable. HD could have easily stuck wilder cams in there, improved the breating a bit but street engines really need to be "streetable" to be fun over the long haul.

I will tell you my sidecar is a nightmare if I try to run it slowly. It loves WOT. And I'm ok on a closed throttle. But like all over cammed, over carburated engines in the mid range it can be a handful.

I would be worn to a frazzle trying to run it on the street.
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yep lack-luster with low compression, p would be better.
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Oh Bustert !

They aren't "lack luster".

I just wish people who wanted to build race engines would race them.

Even I am (relatively) safe on a track. The engine can be given it's head and you really get to see what it will do. It's fun.

When I was young I wanted 4 speed manuals and positraction. Lumpy cams and a big carb.

Now I like air conditioning. Power brakes, windows, steering, seats and auto trans.

The race track is a different story.

We have a shipload of pretend racers around here. Noisy exhausts, spinning wheels.

But they don't have the guts to turn up at the race track.
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Your bike came with a near new set of Andrews cams. Save yourself worry and money by using what you already have. When the bike is going, ride and see if you like it. In theory other grinds might be better for your application. But then again you might be perfectly happy with what you already have and the only way you will know that is by riding your bike. For now I would use my time and money on other things required to get the bike on the road. It is easy to swap out cams later.
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they would do better with 10:1 vs 9:1.
i have y in my ch now and have the originals in their box. am i impressed, naw, there each have their own perks.
i missed my target on compression a bit, but i think my issue is i need to make gearing changes to take advantage of them. with the p i geared for reduce rpm to get out of the vib zone. not enough time and tooo many things to do so it sits. actually getting to the point that mc's are a thing of the past.
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Staffords Staffords is offline
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I found a set of NOS P cams online and bought them.

If anyone is looking for a set of Y cams for a 900 let me know!
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