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Old 04-27-2010, 12:05 AM   #3541
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Default N12 T1

hi there,
can anyone tell me what is the spec of this engine? I mean any info on this N12 T1 ... with silver head??

I know its a basic engine.. any other info?
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Old 04-27-2010, 01:30 AM   #3542
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http://www.novarossi.it/eng/products...2T1&brand=nova
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Old 04-27-2010, 01:37 AM   #3543
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Originally Posted by Roelof View Post
Thanks Roelof. I was in Nova wesbite but missed this info..
thanks.
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Old 04-27-2010, 01:45 AM   #3544
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now may anyone help me on this:

let say i wanna use this engine [N12 T1]for bigger track... how to make it as competitive, on par, with the other big expensive engine... for example the 353.

what shud i do with the clutch setting?
what about pinion/spur setup?
tire size?

thanks. think this as the budget racer tips to hang out with the pro
I just wanna leave the other equation - how to drive, as the only other variable different.

any advice is appreciated - just dont ask me to stop dreaming
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Old 04-27-2010, 06:59 PM   #3545
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Default Flash 21 and Flash 21 special

hi guys,
what's the main differences between the Flash .21 and Flash .21 special?

is there a very noticeable power difference?
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Old 04-27-2010, 07:56 PM   #3546
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hi guys,
what's the main differences between the Flash .21 and Flash .21 special?

is there a very noticeable power difference?
Flash .21 had a microcast piston

Flash .21 Special had a CNC piston = increased bottom end power!
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Old 04-27-2010, 11:15 PM   #3547
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@Team Kamikaze

is it fact that the cnc piston improves bottom end? Just wondering, because I run Novarossi engines since many years and they changed the manufacuring process of their pistons between cnc and microcast a couple of times. Everytime they claimed that the change is an improvement...
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Old 04-27-2010, 11:56 PM   #3548
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Microcasting is using a mold to fill it with liquid piston aluminium but under a high pressure. The molecules will be closer to each other making the material stronger. Finally this piston will be shaped by a CNC proces.
The CNC piston is just made from a bar delivered from the supplier.

Both are just piston materials.....
Depending the other materials inside (copper, iron, silicium etc) the specs/properties is determed like friction, strength, expansion rate etc.

So for me a CNC or a Microcasted piston is just a piston and only these words say nothing about the specs than only that the Microcasted must be stronger.
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Old 04-28-2010, 01:16 AM   #3549
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You made some good point here, Roelof. I think that the terms "cnc piston" and "microcasted piston" are just marketing hype. I had good success with both types of piston which leads me to believe that it makes no big difference. On the other hand I was wondering why Team Kamikaze claimed that the Flash Special has more bottom end by using a cnc piston. I never ran the Special, so I cant compare. By looking at Novarossis expoded views I can tell that the P/S set and the crank is the same between the Flash and the Special.
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Old 04-28-2010, 02:21 AM   #3550
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Some thoughts about the more bottom end:

- different timing (sounds to me the most logical)
- better expansion rate fitting the expansion of the sleeve.
- lower friction (when giving throttle the piston becomes hot and does expand faster compared to the sleeve what will create some friction)
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Old 04-28-2010, 09:31 AM   #3551
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Originally Posted by fulcrum2 View Post
@Team Kamikaze

is it fact that the cnc piston improves bottom end? Just wondering, because I run Novarossi engines since many years and they changed the manufacuring process of their pistons between cnc and microcast a couple of times. Everytime they claimed that the change is an improvement...
The microcast piston is heavier and the CNC from bar-stock aluminum is lighter, and of course the lighter material helps the increase of the overall performance.
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Old 04-28-2010, 10:08 AM   #3552
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Originally Posted by Team Kamikaze View Post
The microcast piston is heavier and the CNC from bar-stock aluminum is lighter, and of course the lighter material helps the increase of the overall performance.
The weight is an issue for performance but is not THE reason for more bottom power. This I know because I have runned many experimental engines with different pistons, rods, timings etc. and a heavy rod/pistin can still deliver a lot of bottom power. The height of the exhaust port has more influence on that.

I think based on a bar of material or Microcasted (based on the same ingredients) there is not much difference in weight.
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Old 04-29-2010, 08:46 AM   #3553
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Hears the actual weights of cast v cnc billet pistons on Axe Rossi pistons as an example. Cast piston = 3.9 grams, cnc billet = 3.7 grams, The cnc piston has slightly more skirt cut away + two 5 mm holes as well so given this their probably the same weight.The reason to use billet material over cast is said to be stronger + billet they can get higher silicon content. A typical cast piston has around 20-21% max silicon, Billet is up to 30% silicon. The thermal expantion on 30% is less than 20% this is why billet pistons are said to last longer than cast ( the piston expands less so dosnt wear as much in the bore). This is also possibly why theirs more bottom end / acceleration because theirs less friction on the piston in the bore because the piston is expanding less. The thermal expantion on billet 30% silicon material is 15.4, Cast 21% silicon which is the maximum that can be made in cast pistons without compromising the material is 16.3. Obviously any reduction in piston weight will make differences as well. Martin.
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Old 04-29-2010, 08:51 AM   #3554
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Originally Posted by martinh View Post
Hears the actual weights of cast v cnc billet pistons on Axe Rossi pistons as an example. Cast piston = 3.9 grams, cnc billet = 3.7 grams, The cnc piston has slightly more skirt cut away + two 5 mm holes as well so given this their probably the same weight.The reason to use billet material over cast is said to be stronger + billet they can get higher silicon content. A typical cast piston has around 20-21% max silicon, Billet is up to 30% silicon. The thermal expantion on 30% is less than 20% this is why billet pistons are said to last longer than cast ( the piston expands less so dosnt wear as much in the bore). This is also possibly why theirs more bottom end / acceleration because theirs less friction on the piston in the bore because the piston is expanding less. The thermal expantion on billet 30% silicon material is 15.4, Cast 21% silicon which is the maximum that can be made in cast pistons without compromising the material is 16.3. Obviously any reduction in piston weight will make differences as well. Martin.
THANK YOU! Very well Explained
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Old 04-29-2010, 09:15 AM   #3555
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Very good and detailed explanation, Martin. Makes a lot of sense to me, thanks a lot for that. The only open question to me remains, why is Novarossi changing back and forth between the piston manufacturing processes and claims and improvement everytime...
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