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Post by skuttadawg on Jan 22, 2012 22:10:17 GMT -5
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Post by bullet on Jan 23, 2012 11:40:36 GMT -5
Thanks, I really enjoyed that.
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Post by twiztedxtasy on Apr 15, 2012 5:35:18 GMT -5
i want that turbo charged minarelli engine that went 233 km/h
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Post by skuttadawg on Apr 15, 2012 6:00:53 GMT -5
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Post by boosterb16 on Jun 17, 2012 21:28:46 GMT -5
I think this swap is all me |
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Post by naseqp on Jul 15, 2012 9:11:50 GMT -5
Back in the late 60's and early 70's my Uncle's mower shop sold these. Very popular at Christmas. We sold some of their larger motorcycles to. They were a blast. Nice to see the garelli name connected with speed records.  |
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Post by prodigit on Jul 17, 2012 22:17:04 GMT -5
I wonder why no one ever equipped the bike with a turbo?
I mean, it's only 50cc, obviously it's traveling at max speed, on long straights.
What better than installing a turbo?
Should give plenty of power for an additional gear!
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Post by skuttadawg on Jul 18, 2012 0:12:07 GMT -5
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Post by mainepeace on Jul 26, 2012 0:13:43 GMT -5
Stock Chinese motor parts cannot handle the torque of a turbo. Even a stock motor can get a hole in the piston on a hot summer day.
A WELL BUILT engine with fully forged components that are ceramic coated may handle a turbo reliably. But if you do that, why stick with a 49.5cc cylinder?
Greg
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Post by OverReved on Jul 26, 2012 0:21:54 GMT -5
I'll just say I disagree, I'd take up the chance to prove things wrong but I'm in no position to procure a tiny turbo and put it on a Chinese scooter anyway. If i could I would.
One change i would definatly make to a Chinese engine if I wanted to turbocharge it would be to drop the stock compression down from the typical 10-12:1 ratio and go with a reasonable turbo compression of 8.5 or so. I'd not feel a need to change internals to forged or employ ceramic coatings, I'd just change the obvious things and see how she goes. Not like today's turbocharged stock engines are anything special in their design or components. If car manufactures can take a gasoline block and just decide to make a diesel out of it, then someone could just decide to turbocharge a dinky little Chinese scooter engine and not be doomed to failure if they had a head on their shoulders.
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Post by skuttadawg on Jul 26, 2012 0:28:26 GMT -5
Would need a forged piston and crank for a turbo along with a custom exhaust
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Post by OverReved on Jul 26, 2012 0:45:02 GMT -5
And I'm disagreeing with that thought.
Need and suggested to have are not mutually exclusive to each other. Cast components are plenty strong for a street engine regardless of displacement, if it's an all out fire breathing monster then sure, you'd better invest in the forged components or expect pieces to be retrieved.
If you do some research or have built some engines.. or know some people you can uncover that cast components tend to fail not from cylinder pressures but from poor fuel mixtures and centrifugal forces from high RPMs. As these parts stand they hold up to some rather impressive RPMs.
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Post by mainepeace on Jul 26, 2012 1:51:30 GMT -5
CAST components typically are fine.
Cast components on the typical Chinese made 139QMB motor are NOT. Just a .05% carbon content difference can make a 30% difference in strength.
Just my opinion of course.
You'd be hard pressed to find ANY turbo motor that has higher than a 9:1 CR unless it's a 100% track alcohol only monster. That's basic forced induction 101 to keep CR below 9:1 or so.
I can go out and put a 100 shot of NOS on my scooter. Will it work for a few seconds, sure. Maybe even a few track runs. Will it work after 100 shots.... eh....
Greg
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Post by OverReved on Jul 26, 2012 2:15:57 GMT -5
Good point made on the Chinese cast Vs a quality cast component.
But honestly we will continue to buy these Chinese things and be happy with them, From porcelain elephant heads to 75% cheaper cat litter we will continue to buy it all.
I'm probably more aware than a majority of people where the things I own came from. Shoes made in Pakistan and Shirts made in Iran, China made in China and cars made in Germany, it's all global now isn't it.
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Post by skuttadawg on Jul 26, 2012 9:22:37 GMT -5
Gotta disagree after 2 TaoTao 63s cracked on me and I NEVER had a piston crack on me and I have been two wheeling for 26 years . I ran www.wiseco.com forged billet pistons and they are maxhined not cast then forged and light years better than China cast stuff |
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Post by OverReved on Jul 26, 2012 11:25:17 GMT -5
Gotta disagree after 2 TaoTao 63s cracked on me and I NEVER had a piston crack on me and I have been two wheeling for 26 years . I ran www.wiseco.com forged billet pistons and they are maxhined not cast then forged and light years better than China cast stuff The standard steps to create a cast piston is- cast the piston then heat-treat the piston then machine it. The standard steps to create a forged piston are create a cast piston, forge that cast piston under high pressure in a mold to a rough final shape, machine forged piston mold. heat treat final product. A top tier forged piston is created by taking a cast slug and forging it then machining it down to a finished piston shape and heat treating it. There's a big difference in each components ease of manufacture and therefore initial cost. In an ideal world they'd all be forged and come from solid billet slugs, but they do not. If you think your piston is a billet piston have a look at the underside and look for casting marks. there are no casting marks anywhere on a true forged billet piston inside or outside. |
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