"CLT" RAF, me build

[tonydenton]

and a piccy would be good.

[Russell]

Fired her up late this arvo.............sounds like a soob WRX on steroids,

[Russell]

Well...........tad disappointed, performance the same, which is fine.......but noise reduction zero, actually noisier .....different note as well.........buggerOk......at the minute, have achieved a "safer" exhaust ( away from the ground grasses...fire ) less weight, looks better.just have to quiet it down..........heaps

[Brian]

Russ, you are looking to quieten the wrong thing. Most noise comes from that prop, the slower & more efficiently you can run the prop, the quieter your gyro will be.My old 2.2 with a straight out bit of pipe sounds reasonably quiet under 4,000 revs, change up to 4,400 revs and it sounds like a truck

[GraemeMonro]

Russ, you are looking to quieten the wrong thing. Most noise comes from that prop, the slower & more efficiently you can run the prop, the quieter your gyro will be.My old 2.2 with a straight out bit of pipe sounds reasonably quiet under 4,000 revs, change up to 4,400 revs and it sounds like a truckYou are partly right Brian, but most of Russy"s noise comes from his mouth.Graeme.

[Russell]

I"ll be quietening monro ina minute...........no brian, i think you may be wrong, me gyro "noise" was ********** with the orig exhaust system, by now changing the system to this current one, my noise has increased a lot, i myself noticed a big increase through my head set doing a lap or 2. Yes i noticed a couple of hundred more revs at full tap, so it must be breathing better.Will be seeking an answer from mate that builds drag cars etc.........let"s see. My wish......is small / light / QUIET..........how ??????????2 independent systems ( one for each head ) is my thinkings, don"t want a web of pipes .......looks like shyte.

[tonydenton]

wow a couple of hundred more revs is a bit of extra hp at the top end. are you sure it"s not exhaust/prop noise. you should take your prop off and run it to see the difference without. it"s a good test. i can hear the tappets on my engine without the prop on.

[Brian]

That original system was rubbish Russ, definitely never designed to go on a suby. All you can do is experiment, seems Ken Watson got his gyro fairly quiet.

[Russell]

Ok.........latest info.........if you want QUIET, then you have to run 4 into 1........( web of pipes....bugger ) then you have to install a muffler, then you have to minimise back pressure to get performance.....that means basically a straight through muffler..............that means NOISELooks like what ever i do............NOISE is going to happen ...........bugger.

[birdy]

Russ, look in frunt of you, sumones taken you for a ride. [ more pipes n crap costs, he didnt arf see you comen. ]Iv never had anythn but a streight through on the ferel, and noones ever said is was loud. All they can hear from the ground is a wild growl at full noise, and thats comn from an angry prop.Its all in the resonance.Me ol Merc truck blew a muffler a coupla years ago, [ rattle your eardrums loud].It was a twin, two headers into two 4" mufflers with a balance tube.Wasnt go"n to fork out zillions for a station truck pipe, so i made up a 2 into one and streight out into the blue.This systm is quieter n the orrigional Merc setup. No backpressure n no noise.

[tonydenton]

i had a bit of an obsession with exhaust noise a few years back. i was happy with what i had but wondered if there was anything quieter. i changed and fitted about everything i could think of other than hand making one hand packed with s/s dish washing mesh, like i saw some one do. yes i even tried a motor bike muffler. the guy at the shop went to all the trouble of working out the difference between my 1800cc engine doing 5k rpm and a smaller motor bike engine doing 10k or so rpm. gave it for me to try, no diference in power at all but sounded like a bloody motor bike.

[Russell]

It"s got me stuffed..............me same engine ina soob WRX ball tearin 300 mile an hr car........revin it"s ring out, is quiet as. Ol mate here says coz we gyros are SLOW our noise hangs around far longer as we putter off

[Disco]

Put a mechanical silencer on it.

[mad max]

I put two $25 hot dogs on my EJ25 Russ. I think it sounds sexy, good enough for NT standards, and suits the budget of a poor old pensioner receiving a third of a black fellows pay. (Didn"t make a nest egg after 24 yrs. in business because I was too honest)

[birdy]

( orig system $1500.....this one $3000 )See, i told you he seen you comen. And he"s go"n to make that brick sing pretty songs till you run out. ;D