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Post by cdoublejj on Apr 19, 2015 23:35:02 GMT -5
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Post by joshua864 on Apr 20, 2015 0:13:22 GMT -5
I've got an A9 cam ordered from scooters to go after dealing with some headache from USPS it should be here sometime this week and as soon as it is installed I will give u an update on performance gains if any |
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Post by phillipmalecot101 on Apr 20, 2015 2:39:43 GMT -5
I have a gmw 50 with a stock engine other than the 18 dollar cam I bought from ebay. This one.. www.ebay.com/itm/171729382929?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITI have to say this made a world of difference for my scoot. I live in Tallahassee with quite a few hills and the cam gets the rpms up much quicker and keeps them higher which helped my power range. I'm currently working on my transmission set up but with these hills the rpm drop has been almost dangerous with about 6 mph indicated on the steepest hills. Now with the cam the power is much more broad and my max speed has increased by at least 5 mph as well as acceleration. This is just my experience with a low power set up but once it was in I immediate felt the difference. Go for it, cheap and easy upgrade, just my 2 cents |
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Post by joshua864 on Apr 20, 2015 12:15:48 GMT -5
I have a gmw 50 with a stock engine other than the 18 dollar cam I bought from ebay. This one.. www.ebay.com/itm/171729382929?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITI have to say this made a world of difference for my scoot. I live in Tallahassee with quite a few hills and the cam gets the rpms up much quicker and keeps them higher which helped my power range. I'm currently working on my transmission set up but with these hills the rpm drop has been almost dangerous with about 6 mph indicated on the steepest hills. Now with the cam the power is much more broad and my max speed has increased by at least 5 mph as well as acceleration. This is just my experience with a low power set up but once it was in I immediate felt the difference. Go for it, cheap and easy upgrade, just my 2 cents Exact same one I ordered just git it in today and in middle of installing now |
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Post by phillipmalecot101 on Apr 20, 2015 13:18:27 GMT -5
I have a gmw 50 with a stock engine other than the 18 dollar cam I bought from ebay. This one.. www.ebay.com/itm/171729382929?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITI have to say this made a world of difference for my scoot. I live in Tallahassee with quite a few hills and the cam gets the rpms up much quicker and keeps them higher which helped my power range. I'm currently working on my transmission set up but with these hills the rpm drop has been almost dangerous with about 6 mph indicated on the steepest hills. Now with the cam the power is much more broad and my max speed has increased by at least 5 mph as well as acceleration. This is just my experience with a low power set up but once it was in I immediate felt the difference. Go for it, cheap and easy upgrade, just my 2 cents Exact same one I ordered just git it in today and in middle of installing now Let me know how it goes! |
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Post by joshua864 on Apr 20, 2015 15:10:46 GMT -5
So far I'm getting about a 3mph gain on top end but it's windy as hell here and haven't got a chance to open it up yet really but definitely worth the 18$ and 30 min to install from what I can tell so far
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Post by Scooters To Go on Apr 20, 2015 16:06:31 GMT -5
I found this sitting around, and I'm pretty sure it's for my 139qmb A9 camshafts.
"
A9 Cam specs:
Intake lobe widest point: 25.78
Exhaust widest point: 25.67
Lift: 5.86
Lobe Separation Angle: 119 degrees
Stock Cam specs:
Intake lobe widest point: 24.48
Exhaust widest point: 24.52
Lift: 5.02
Lobe Separation Angle: 116 degrees
The A9 cam has 3 degrees more separation, when combined with the wider lobe and higher lift, forces the valves to stay open longer- which allows more time for larger intake and exhaust volumes. This is the reason they rev higher and have more power output than the Stock cam."
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Post by cdoublejj on Apr 20, 2015 21:16:53 GMT -5
I found this sitting around, and I'm pretty sure it's for my 139qmb A9 camshafts. " A9 Cam specs: Intake lobe widest point: 25.78 Exhaust widest point: 25.67 Lift: 5.86 Lobe Separation Angle: 119 degrees Stock Cam specs: Intake lobe widest point: 24.48 Exhaust widest point: 24.52 Lift: 5.02 Lobe Separation Angle: 116 degrees The A9 cam has 3 degrees more separation, when combined with the wider lobe and higher lift, forces the valves to stay open longer- which allows more time for larger intake and exhaust volumes. This is the reason they rev higher and have more power output than the Stock cam." as discussed before higher RPM range can be problem if held at 11K long enough. (rod bearings) i've done some oil pump comparison my self. scooterdoc.proboards.com/thread/11643/compare-gearsI think my determination might be such cam might be a good upgrade as long as it does not subtract bottom end power or notable bottom end power so long as the rider doesn't wring the engine to death at RPMs. also synthetic oil would probably help since the GY6 probably runs a little warm. |
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Post by cdoublejj on Apr 26, 2015 0:33:07 GMT -5
dies the a9 subtract from bottom end? is there a mid range cam?
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Post by joshua864 on Apr 26, 2015 1:22:49 GMT -5
dies the a9 subtract from bottom end? is there a mid range cam? The A9 is a mild cam from what I've seen the go from A8-14 or so kinda wishing I had went with the 10 |
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Post by 90GTVert on Apr 27, 2015 7:48:32 GMT -5
If you get significant gains and RPM increase, any minor low end loss would not be a concern for a CVT driven scoot. Changing how the clutch and CVT operate to keep the engine out of low revs would likely make it a non-issue.
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Post by cdoublejj on Apr 28, 2015 22:47:03 GMT -5
If you get significant gains and RPM increase, any minor low end loss would not be a concern for a CVT driven scoot. Changing how the clutch and CVT operate to keep the engine out of low revs would likely make it a non-issue. supposedly the rod bearings let go in the 11k RPM range according to scooters2go and i think they may be on to something i got a freebie with 200 miles and a horrid knock. it had some down hill action before i got it. dies the a9 subtract from bottom end? is there a mid range cam? The A9 is a mild cam from what I've seen the go from A8-14 or so kinda wishing I had went with the 10 there are other versions!? where does one find them? |
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Post by 90GTVert on Apr 30, 2015 7:13:20 GMT -5
I'm sure you will have trouble if you rev to 11,000RPM regularly. That said, I don't know if any of the cams available really support that kind of revs or if the valvetrain would hold up to it either.
You can find tons for the larger GY6 (125/150cc), but I pretty much just see the A9, Naraku cams, and NCY for the 50.
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Post by humanshield on Apr 30, 2015 7:26:01 GMT -5
Has anyone used an A9 cam along WITH a BVH ?
I may give it a try to see if there are any valve to piston interference issues.
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Post by cdoublejj on Apr 30, 2015 23:39:42 GMT -5
I'm sure you will have trouble if you rev to 11,000RPM regularly. That said, I don't know if any of the cams available really support that kind of revs or if the valvetrain would hold up to it either. You can find tons for the larger GY6 (125/150cc), but I pretty much just see the A9, Naraku cams, and NCY for the 50. what they needs is all around cam or one that has bottom to mid range or mid range to top end. or just a really good mid range cam. this guy a did review on spring!!! 49ccscoot.proboards.com/thread/415/1100-1284-150cc-valve-springshe even has the same avatar as you.  |
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