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Old 07-23-2003, 09:22 AM   #1591
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Default Chrome on SX 12 and MT12

Hello everybody. I lately was working on two novas, one is nova mega SX 12 and other one is MT12. I have noticed one interesting thing-SX12 5 ports chrome coating there is gridined and on MT12 3 port legal is honed. Does anyone else have noticed this difference too? The base sizes are very similar exept SX 12 short rod, but the way how the work out chrome coating is different. Anybody has any idea why?
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Old 07-24-2003, 05:47 AM   #1592
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Default Re: Chrome on SX 12 and MT12

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Originally posted by Top Gun 777
Hello everybody. I lately was working on two novas, one is nova mega SX 12 and other one is MT12. I have noticed one interesting thing-SX12 5 ports chrome coating there is gridined and on MT12 3 port legal is honed. Does anyone else have noticed this difference too? The base sizes are very similar exept SX 12 short rod, but the way how the work out chrome coating is different. Anybody has any idea why?
Granted I have only attended Georgia Tech and Berkeley in Mech
Engineering but what the hell is GRIDINED...??...Short rod equals
soft low end rpm...long rod equals MUCH better bottom end
response...answer this: why is it that the NEW NS12-S3 has a
plastic venturi insert that has 5.4 mm on it but is 5.2 mm in size...
could it be that Nova Rossi is trying to find a way to answer the
question what can we make that has the low end response of
an MT-12???...whatever....point is...everyone wants low end AND
great top end...what else is new....
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Old 07-24-2003, 05:54 AM   #1593
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Default Re: Re: Chrome on SX 12 and MT12

Quote:
Originally posted by jd300zxtt
Granted I have only attended Georgia Tech and Berkeley in Mech
Engineering but what the hell is GRIDINED...??...Short rod equals
soft low end rpm...long rod equals MUCH better bottom end
response...answer this: why is it that the NEW NS12-S3 has a
plastic venturi insert that has 5.4 mm on it but is 5.2 mm in size...
could it be that Nova Rossi is trying to find a way to answer the
question what can we make that has the low end response of
an MT-12???...whatever....point is...everyone wants low end AND
great top end...what else is new....
Yes Dennis: I am still alive and racing...in fact I will be at Revelations Raceway (site of ROAR NATS)along with most
of your fast buddies this weekend...
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Old 07-24-2003, 06:47 AM   #1594
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Default Re: Re: Chrome on SX 12 and MT12

Quote:
Originally posted by jd300zxtt
Granted I have only attended Georgia Tech and Berkeley in Mech
Engineering but what the hell is GRIDINED...??...Short rod equals
soft low end rpm...long rod equals MUCH better bottom end
response...answer this: why is it that the NEW NS12-S3 has a
plastic venturi insert that has 5.4 mm on it but is 5.2 mm in size...
could it be that Nova Rossi is trying to find a way to answer the
question what can we make that has the low end response of
an MT-12???...whatever....point is...everyone wants low end AND
great top end...what else is new....
Thanks for your replay. But i am not refering to lenght of the rod, I am refering my question to the way how they treat chrome after they make plating. On one engine it is done by honing prosedure and on another it is done by round internal griding. I might missspel it, sorry abou it.
BTW, I graduated from Tashkent mechanical University with Master degree in mechanical engineering, but the differnce between honning and griding I new before I went there.
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Old 07-24-2003, 08:42 AM   #1595
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Default Re: Re: Chrome on SX 12 and MT12

Quote:
Originally posted by jd300zxtt
Granted I have only attended Georgia Tech and Berkeley in Mech
Engineering but what the hell is GRIDINED...??
He meant grinded .
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Old 07-24-2003, 09:05 AM   #1596
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Default Re: Re: Re: Chrome on SX 12 and MT12

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Originally posted by modellor
He meant grinded .
i dont have a degree and even i knew that!!
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Old 07-24-2003, 09:07 AM   #1597
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Default Re: Re: Re: Re: Chrome on SX 12 and MT12

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i dont have a degree and even i knew that!!
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Old 07-24-2003, 09:14 AM   #1598
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He meant "ground".

An English Degree is what we need here - I ain't got one.
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Old 07-24-2003, 10:15 AM   #1599
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Ok, now everybody is clear what did I mean!, so let's go back to subject-any thing to talk about it, please. Why one of them one way and other is different. I have my opinion for both ways and I would like to discuse about it with anybody who want to do so.
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Old 07-24-2003, 10:36 AM   #1600
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777 its a cost thing. They are generally all ID ground to start with and the end result is preferrable because it leaves a finish in the 6 micro range if they are good at it. Piston wear is lower overall which is a good thing. If you see one that is honed generally it is a rework sleeve that needed to be sized a micro or two larger. These are generally secondary piston and sleeve assemblies and go in lower cost engines. The last process which is being used on the new NS is a process called called cork bond honing which the liner is left with a very polished finish,(like 2 micro, very polished) it is being done on the upper end of the sleeve. This brings piston wear down very low and provides long life but requires alot of break in.

On the offset transfers on one side or the other it is an attempt to balanceport flow and offset the port flow time delay and fuel bias to one side of the engine caused by crank rotation.

JD hows things I was at REV this last weekend hanging out. I helped Barry a little with his clutch and pitted his main for him. Wont be at the nats it just aint in the cards with what is comming, however some of my engines will be.

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I was out there on Hobby business.
I will be making an announcement this afternoon.
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Old 07-24-2003, 11:00 AM   #1601
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Default Motor

Get to work. You have had way too much time off.
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Old 07-24-2003, 12:36 PM   #1602
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Quote:
Originally posted by Motorman
777 its a cost thing. They are generally all ID ground to start with and the end result is preferrable because it leaves a finish in the 6 micro range if they are good at it. Piston wear is lower overall which is a good thing. If you see one that is honed generally it is a rework sleeve that needed to be sized a micro or two larger. These are generally secondary piston and sleeve assemblies and go in lower cost engines. The last process which is being used on the new NS is a process called called cork bond honing which the liner is left with a very polished finish,(like 2 micro, very polished) it is being done on the upper end of the sleeve. This brings piston wear down very low and provides long life but requires alot of break in.

On the offset transfers on one side or the other it is an attempt to balanceport flow and offset the port flow time delay and fuel bias to one side of the engine caused by crank rotation.

Hello Dennis. thanks for replay.
So, basecaly the difference is everything whih didn't come thruogh the QC from ground will be honed and sell as secondary product?
THere was time, when the honnign idea was that touch up scraches trap lubricant and keep there provide extra lubrication, but according to molecular lube theory new kind of lubricant has much smaller molecular design and it is enough clearnce between piston and sleeve to have it there. As I know, any of high level engine is grounded (in airmodeling and boating, check "profi" brand engine or K90).
About the offset ports. it is very intersting, what about the scoop on the turbo cranck, which basecaly performing the same effect, uneven filling of the transfer ports, for left side port it is creating extra flow, but for right side ports actualy from any angle to see it, it doesn't make sence to have it there. I saw some engines moded by different guys, they made two and some times three scoops, but what ever angle you look at it, it will not create extra flow on the right side ports (view from the back). It will make sence to have it, if extra bypass prot there, but not too many of engines has it. Can you clear it please. I have never seen scoop before I got to RC cars.
BTW, 6 micro isn't too much. we always was looking for 5 micro for non round geometry of sleeve and piston.
Thanx in advance.
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Old 07-24-2003, 02:12 PM   #1603
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is there any point in modifying a MS Nova Mega .12
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Old 07-24-2003, 03:28 PM   #1604
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Quote:
Originally posted by YBSLOW
Get to work. You have had way too much time off.
Don't give him too many horsies Dennis! Nice to meet you last weekend, looking forward to "the announcement". Sorry you can't make the Nats, but good luck to your drivers! Can't wait.
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Old 07-24-2003, 03:35 PM   #1605
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announcement is here


http://www.rctech.net/forum/showthre...threadid=21722

Yes it was cool meeting you guys, I met alot of people who I have talked to on the web from time to time. Just to bad I didn't get around to everybody. I'm a social character by nature.
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