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Model Forum / Radio Controlled / Land Models / October 2006Shiney pipe!
Well my shiney new HPI pipe just arrived for my Savage. Looks like I'll be doing some fiddling next couple of nights! First off I'm going to re-tune the engine with the ribbed pipe, see how it goes, then swap pipes, re-tune and repeat. See how much quieter it is (and see how much more torque!) Cheers Dre > Well my shiney new HPI pipe just arrived for my Savage. Looks like I'll > be doing some fiddling next couple of nights! First off I'm going to [quoted text clipped - 3 lines] > > Cheers Dre I've run the polished pipe on the S-25 and the Sportwerks .26 and it did very well with both engines, especially the SWK .26. It wasn't too loud on the S-25, but is OBNOXIOUS on the SWK .26. It actually hurts my ears, and I play the drums, so my ears are pretty much shot already. I've never run a ribbed pipe, but if it's any louder than the polished pipe...........ouch. It's got great all-around power; no single part of the powerband stands out among the rest; it's just balanced power throughout. Doc >> Well my shiney new HPI pipe just arrived for my Savage. Looks like I'll >> be doing some fiddling next couple of nights! First off I'm going to [quoted text clipped - 14 lines] > > Doc Sounds good! (no pun :) Hope its not completely ear bleeding with a K4.6 then as the ribbed one was hell loud. I'll post back once I've run them back to back. Hehe, I also remembered that I haven't tried the d-box out in the Savage yet, thats 2 things on the list allready! Cheers Dre > Well my shiney new HPI pipe just arrived for my Savage. Looks like I'll > be doing some fiddling next couple of nights! First off I'm going to [quoted text clipped - 3 lines] > > Cheers Dre IME the ribbed pipe was a good bit louder than the polished - polished is still bloody loud though heh! I have a resonator pipe on the way for one of my Revos - I haven't decided which yet.... I might just flog the non-modded one now and have it done with :-)  SignatureDan .. > I might just flog the non-modded one now and have it done with :-) Name a price and I'll thourghly consider it. > Well my shiney new HPI pipe just arrived for my Savage. Looks like I'll be > doing some fiddling next couple of nights! First off I'm going to re-tune > the engine with the ribbed pipe, see how it goes, then swap pipes, re-tune > and repeat. See how much quieter it is (and see how much more torque!) I'm a leccy fiend so please don't laugh at me when I ask this question but I've never understood why the exhaust pipe does anything e.g. you mention increase in torque etc. but why is it so? It seems to me to be a tube to carry away the waste from the engine. Signature______ ___ __ /_ __/_ __/ _ )_______ ___ _/ /_____ ____ / / / // / _ / __/ -_) _ `/ '_/ -_) __/ /_/ \_, /____/_/ \__/\_,_/_/\_\\__/_/ /___/ There are 10 types of people in this world; those who understand the binary numbering system and those who don't. There's no place like 127.0.0.1. ASCII a silly question, get a silly ANSI. > > Well my shiney new HPI pipe just arrived for my Savage. Looks like I'll be > > doing some fiddling next couple of nights! First off I'm going to re-tune [quoted text clipped - 5 lines] > mention increase in torque etc. but why is it so? It seems to me to be > a tube to carry away the waste from the engine. On two stroke engines the design of the tuned pipe (also known as an expansion chamber) is crucial to performance, power output and torque. Each section of the pipe after it leaves the combustion chamber plays a crucial part of the tuning of the motor. There's the header (the length of pipe leading to the expansion chamber), the diffuser the beginning section of the expansion chamber where the pipe starts to open), the middle section that I cant remember the correct name of, the tail end of the pipe where it start to close up again and the stinger on the end. Each one of these sections is a specific tuned length and by changing any one of these sections will produce different effects on performance. Even changing the length of the header leading to the tuned pipe will give you great torque or vice versa and this is usually the easiest to modify nitro cars and trucks by changing the length of the coupler. The tuned pipe is designed to give both forward and reverse pressure, meaning that it is designed to allow the exhaust gases to flow out the pipe but also designed in a way to allow a back wave of pressure flow back towards the combustion chamber. This back wave acts in a similar way as the exhaust valve of a four stroke engine does. The stinger also plays a crucial part in the way that the tuned pipe works. A lot of people put a extension on the end of this to carry the unburnt fuel away from the tyres, wheels and chassis because it makes it hard to clean but doing so also changes the tuning of the exhaust system. Here is a good understand of how two stroke engine work: http://en.wikipedia.org/wiki/Two-stroke_cycle Cheers |
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