ELOSSAM
Senior Member
Posts: 146
Loc: MADRID, SPAIN
Reg: 11-19-01
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 02-03-03 10:33 PM - Post#15447
While I�m waiting for the spare parts of my RC230 and a reply from the manufacturer about the scratch incident, I want to install a K&N filter from VARIO on it but instead of using the coupler they use I want to make a new one that gives more laminar air flow into the carb aligning boths centers . (The VARIO unit forces the air flow to twist between the air filter and the carb as its centers are not aligned). It also gives the possibility to do something similar to a velocity stack, a cone could be done reducing the air filter diameter to the carb diameter.
Any one knows any rule I must bear in mind about max angle, length and diameter relation? Any advise?
Regards
Elossam
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Billme
Senior Member
Posts: 198
Loc: MS
Reg: 03-26-01
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02-05-03 03:34 PM - Post#15519
In response to ELOSSAM
Your speaking way above my head on this one:) I have found using the K+N filter that if you put the oil on the filter, you lose air flow..It swells the fiber...The only thing I can recommend is not using the oil...
Do you think you might have ingested something?
Regards,
Bill
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ELOSSAM
Senior Member
Posts: 146
Loc: MADRID, SPAIN
Reg: 11-19-01
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02-05-03 10:23 PM - Post#15536
In response to Billme
Of course an air filter will broke the air flow more than if you don´t use it. But I was never brave enough to run my gasser without air filter. I prefer to loose some power but be sure nothing goes into the carb except air and fuell. Here where I live only some months are fine to use the engine without the filter due to hight dust density. You must agree with me that a K&N filter must be better that the original airfilter box. Both could be use with or without oil but the K&N has more surface, a shorter way for the air flow to run and a bigger hole to be reduced till the carb hole diameter allowing it to increase air speed. At least this filter goes far away from the engine and doesnt suck heated air from around the engine as the original one.
re: "Do you think you might have ingested something? " my heli didn´t, me could be 
Elossam
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Billme
Senior Member
Posts: 198
Loc: MS
Reg: 03-26-01
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02-06-03 01:01 AM - Post#15547
In response to ELOSSAM
When I speak of not using a filter, it is on the 167A carb on the G-23 PUH, and G2D series...The reason was for better atomization of the fuel...Since the new carbs have been run on the older engines, they work great with the airfilter...
The new engines do just fine with the airfilters for the type flying you do...
Your correct, the K+N is better than the stock...Although, for those who just wants to keep the stock airfilter, you can drill extra holes to increase the airflow...Be sure you don't drill the holes that will by-pass the foam:)
Regards,
Bill Meador
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ELOSSAM
Senior Member
Posts: 146
Loc: MADRID, SPAIN
Reg: 11-19-01
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02-06-03 02:01 PM - Post#15562
In response to Billme
Well, it seems to be there is no other suggestion of how to build the velocity stack, a trial & error test must be done.
Game on.
Only one thing more, Bill, more air flow needs more fuell too, right? does it also mean the general running temperature will be increased?
Elossam
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Billme
Senior Member
Posts: 198
Loc: MS
Reg: 03-26-01
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02-07-03 02:45 AM - Post#15589
In response to ELOSSAM
>Only one thing more, Bill, more air flow needs more fuell too, right? does it also mean the general running temperature >will be increased?
If your running on the very edge, yes...It all depends on how much saturation you have in a cycle....My objective is to run as rich as I can, and still be smooth....
This provides more power with cooler running temps, without running on the very edge...Load has a lot to do with this on a 2 stroke...
I have spoken with the designer of this carb, and I must tell you that what you are trying to do is already been done on the inlet of the 603...Notice the bugle type inlet? This is a very important design that mimicks the velosity stack, and is one of the key reasons this carb works so dang good....
Velosity stacks are design for wide open operation..They make the needles critical during hover, which is not full throttle, because of the lenght..However, this was on the older style carbs...It maybe a new ballgame now...I don't know:) To get the velosity design used with a airfilter would simply mean matching the outlet of the filter to the inlet of the carb, and adjusting the lenght, like on a tune pipe...I've never done it, but thats what modeling is all about:) Test the water Elossam
Many Regards,
Bill
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ELOSSAM
Senior Member
Posts: 146
Loc: MADRID, SPAIN
Reg: 11-19-01
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02-07-03 02:07 PM - Post#15608
In response to Billme
Hi Bill, that�s exactly what I supposed.Could you ask your friend which relation exists between the lenght of a velocity stack and his influence over the low/middle or hight end of an engine rpm curve and/or transition between stages?
Thanks in advance
Ellosam
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