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Post by ital on May 27, 2015 16:33:27 GMT -5
Hi all, I found a pretty sick chart about camshaft but I do not know how true it is. I ordered a bunch of parts and I am missing only a camshaft. I was thinking about going with the A14 from hoca, but this chart makes me want to get an A11. I would love to know what you guys think and I am also not able to find a good quality A11 anywhere. ideas?  |
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Post by phatboy on May 29, 2015 1:49:49 GMT -5
I found the same chart when researching cams. I had a 49cc, but it seemed A9 cams were far more common and cheaper than any other cam, and tried and true.
I went with A9 and it was a very good performer, I also installed lighter rollers to take advantage of A9's higher powerband. If that chart is true, A9 outperforms A11 on the top end. It is very close to A11 anyway, you probably wouldn't notice much difference though.
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Post by geh3333 on May 29, 2015 2:14:29 GMT -5
From the chart , I'd say the A13 destroys them all !! I mean look at that curve, I bet down hill you'd be able to hit at least 20mph !
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Post by RapidJim on May 29, 2015 8:24:01 GMT -5
I am with phatboy on this one. The A9 curve is very close to the A11 curve but A9 continues to give power increase up to 8500 and doesn't drop as fast after that.
I have used quite a few of scrappydog's A9s but have not tried a A11. IMHO the A9 is the way to go
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Post by steve on May 29, 2015 9:08:20 GMT -5
I just ordered an A9. It looks like the 9 & 11 are by far the best. Unless you are racing, you can disregard everything past 8000. If you use your scoot for transportation, like me, you don't even want to get it up to 8K much, if at all. If you can get an 11 for the same price, do it, as it appears to be very slightly better in the usable RPM range. If it is much more expensive, I would just go with the 9.
Does anybody know which one the stock cams are closest to?
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Post by JoeyBee on May 29, 2015 9:22:39 GMT -5
I was wondering the same thing.
What is a stock cam for a 150?
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Post by ital on May 29, 2015 14:27:40 GMT -5
I ended up getting an A14 as I think it would work better with my hand ported head and valve job.
My buddy got the A11 so we shall see. should be a nice comparison test :-)
Keep in mind I do not plan to go much past 7500 rpm
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Post by dmartin95 on May 29, 2015 14:59:49 GMT -5
I am with phatboy on this one. The A9 curve is very close to the A11 curve but A9 continues to give power increase up to 8500 and doesn't drop as fast after that. I have used quite a few of scrappydog's A9s but have not tried a A11. IMHO the A9 is the way to go I'm with Jim, and as I said in the other thread, the A-9 I think will be the way to go.... The A-11, people can get good results if they're willing to machine the valve length (according to head 1P57QMJ or 157QMJ).... The A-11 wil for sure allow that head to breath but the risk of floating your valves. I would only use the A-11 in a race (strip, not track) only engine that's paired with a stroker..... Some information I have saved about the A-11 A-11 cam being so aggressive, it abuts joint spring coil valves, and creates a hard point.
27.22 INTAKE 27.10 EXHAUST
It is therefore necessary to take them to the grinder to reduce their height, just enough to make the most efficient cam.
This minor inconvenience not plug and play, However, this is the most racing cam that is, to adapt.
------------------ And an excerpt from Martin racing performance: Best low-end torque for climbing & rock crawling. Intake lobe height: 27.18mm Exhaust lobe height: 27.08mm. This cam is what you want if you are building a low end, slow going, rock climbing, and trail jumping machine for use in the Eastern US. Also for the desert and the Rockies. Too low for dunes. Not recommended for scooters. |
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Post by phatboy on May 29, 2015 16:56:40 GMT -5
Scoots have different considerations for cams, as the CVT keeps the RPMs pretty much constant for a given load, while it does vary, it doesn't vary to the point where a low end cam would really help, in my opinion. I think a low end cam would be better for an ATV or something with chain driven, not a CVT.
The A9 helped everything across the board. Helped with acceleration at all throttle positions, overall drivability, even cruising and off the line power, there was no downside. I installed lighter rollers so the CVT would run about 7500, it was pretty much constant 7500 at WOT from 0 to near top speed, only at near top speed did RPMs climb above. It helped the top speed by 6 MPH due to the cam's slower dropoff in power on the top end. If you are taking the scoot on the freeway the A9 is the way to go.
Only considerations for the A9 was a decrease in gas mileage and a little more valve noise when warm. It wasn't enough to worry about.
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Post by ital on May 29, 2015 17:37:35 GMT -5
Good information guys. I really wanted to try the A14, that is the only part I am still missing. The Hoca Camshaft at partforscooter is an A14. Which A9 that is a good brand you guys recommend? I might as well go with the mainstream...  |
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Post by geh3333 on May 30, 2015 5:05:08 GMT -5
You can never go wrong with NCY.
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Post by ital on May 30, 2015 8:18:34 GMT -5
I do not think NCY makes an A9 Camshaft
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Post by geh3333 on May 30, 2015 23:29:01 GMT -5
I do not think NCY makes an A9 Camshaft Really ? I'll have to take a look and see if I can find out. |
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Post by geh3333 on May 30, 2015 23:49:57 GMT -5
They make a performance cam . but it doesn't say what size it is  |
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Post by wilds on May 31, 2015 0:24:54 GMT -5
That is my chart which I found on a french site...
I have tried A14 on my 125cc and the lobs compresses the valve spring to the absolute max.
I would go with the A9 or A11...
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