19 replies to this topic

[mototdm]

I'm thinking of changing my OEM exhaust silencers. Not after any power boost  but something lighter a better sound . I have hear about  Fuel cans  good quality without breaking the bank. Any feed back on them or would you recommend something else.

[Luke]

Hi there. I am using Fuel cans. They are good, lighter and do sound better. You may want to leave the baffles in though. Had them on for about 4 or 5 years now with no issues.

[shiftylukbast2]

I fitted Simmi pipes; amazing value for money, very good customer service, politely noisy, required a little persuasion to fit. They do not seem to alter power delivery at all, as measured by the seat of my pants rather than anything objective.

[Borderraider]

Another vote for simmiperformance exhausts

[mac163]

Another thumbs up here for the Fuel cans, I have run these for 3 years and they were easy to fit and sound "soooo" much better.

I agree with RFU in that my TDM did not like the baffles being removed.

Cheers

Mac

[dmmsta]

+1 for Fuel's.

 

I'm running without baffles, with no real issues - nice pop on the overrun.

 

I've also had Laser DuoTech's which were good though the way they go together isn't as slick as the fuels.

 

There's also the option of modding your OEM can's.  There's a thread by Azza about it...

[Staffy]

Following this with interest. 

[Catteeclan]

I've also had Laser DuoTech's which were good though the way they go together isn't as slick as the fuels.

Hut hummm.

[dmmsta]

Hut hummm.

Noted...

 

Ready to go, just need a box.

 

Trust me it's life with twins thats causing the problems...ask the guys that came to the fettle...

[Bjørge]

+1 for Fuel's.

 

I'm running without baffles, with no real issues - nice pop on the overrun.

 

 

 

Why is this popping nice, being a symptom of unburned fuel due to wrong air/fuel mixture caused by changed exhaust flow resistance not handled by altered fuel mixture ? (wow, that was some sentence ;-)

 

I am cincerely curious, as I don't understand this feeling....

[Studley Ramrod]

 

Why is this popping nice, being a symptom of unburned fuel due to wrong air/fuel mixture caused by changed exhaust flow resistance not handled by altered fuel mixture ? (wow, that was some sentence ;-)

 

I am cincerely curious, as I don't understand this feeling....

 

Here's what Mikuni have to say:-

 

QUOTE

4: Backfires in Exhaust

Note:

It is normal for many high performance exhaust systems to moderately backfire or pop when the throttle is closed from mid-to-high rpm. In fact, one should expect a well-tuned high performance engine to "pop" and "crackle" when the throttle is closed at high rpm.

The popping is a result of the air/fuel mixture becoming very lean when the throttle is closed and the engine is rotating well above idle speed. It is also necessary that the exhaust system have rather open mufflers.

Why This (normally) Happens:

1) When the throttle valve is in the idle position, fuel does not flow out of the main system (needle, needle jet, main jet). Fuel is only delivered to the engine by the pilot (idle) system.
2) The combined effect of the closed throttle and elevated engine rpm is to create a fairly strong vacuum in the intake manifold. This vacuum, in turn, causes a high air flow rate through the small gap formed by the throttle valve and carburetor throat.
3) Under these conditions the pilot (idle) system cannot deliver enough fuel to create a normal, combustible air/fuel ratio. The mixture becomes too lean to burn reliably in the combustion chamber. It gets sent into the exhaust system unburned and collects there.
4) When the odd firing of the lean mixture does occur, it is sent, still burning, into the exhaust system where it sometimes ignites the raw mixture that has collected ---- the exhaust then pops or backfires.
5) Completely stock Harleys do not do this until open-end mufflers, such as the popular Screamin' Eagle slip-ons, are installed. The exhaust must be both free-flowing and have an open exit for the popping to occur.
 

 
 

[Quartermaster]

I had Fuel cans, good quality, great sound and nice people to deal with. Do they still pack Kendal Mint Cake with your order?

[dmmsta]

 

 

Here's what Mikuni have to say:-

 

QUOTE

4: Backfires in Exhaust

Note:

It is normal for many high performance exhaust systems to moderately backfire or pop when the throttle is closed from mid-to-high rpm. In fact, one should expect a well-tuned high performance engine to "pop" and "crackle" when the throttle is closed at high rpm.

The popping is a result of the air/fuel mixture becoming very lean when the throttle is closed and the engine is rotating well above idle speed. It is also necessary that the exhaust system have rather open mufflers.

Why This (normally) Happens:

1) When the throttle valve is in the idle position, fuel does not flow out of the main system (needle, needle jet, main jet). Fuel is only delivered to the engine by the pilot (idle) system.
2) The combined effect of the closed throttle and elevated engine rpm is to create a fairly strong vacuum in the intake manifold. This vacuum, in turn, causes a high air flow rate through the small gap formed by the throttle valve and carburetor throat.
3) Under these conditions the pilot (idle) system cannot deliver enough fuel to create a normal, combustible air/fuel ratio. The mixture becomes too lean to burn reliably in the combustion chamber. It gets sent into the exhaust system unburned and collects there.
4) When the odd firing of the lean mixture does occur, it is sent, still burning, into the exhaust system where it sometimes ignites the raw mixture that has collected ---- the exhaust then pops or backfires.
5) Completely stock Harleys do not do this until open-end mufflers, such as the popular Screamin' Eagle slip-ons, are installed. The exhaust must be both free-flowing and have an open exit for the popping to occur.
 

 
 

 

What he said

 

It's purely grin factor on my part - trying to retain some of my teen/tweenty something memories alive

[mototdm]

So this backfire issue.....Is it Ok to backfire with an injected system. Mine does with the baffles removed.

as I found out with the fuel system fitted. Agree with sound, its awesome man!!

[aytcat1]

I get this burble or pops on my 350mm Delkevic with baffle in,only does it when engine is warmed up after a few miles never when cold eg early morning.I fined pulling in the clutch seems to stop it happening but then that is when im entering  the street where i live otherwise im not bothered,

Edited by aytcat1, 16 September 2014 - 08:49 pm.

[RogerD]

Just to add my 2 cents....when I bought my 9er, it was already fitted with Scorpion cans. I have never fitted aftermarket exhaust before  . The quality of the cans is pretty good, judging by the looks and fit. I also get popping on the over run, and like aytcat1 i tend to pull the clutch in when I get close to home. I have to admit that initially I was unsure of the "noise factor" but found I quite liked it   . I have since decided that they are probably not really loud enough    , and having recently heard a TDM equiped with FUEL cans at the Bridgenorth cafe, that certainly sounds more like the noises I fancy.

Have been told that the baffles come out of the Scorpions.....hmmm....maybe...?

[Luke]

If the Bridgenorth cafe you mean is the Quat, then it may of been me. It's one of my regulars.

[Geordie Guy]

I had FUELS, I changed them back, too noisy and I did have a back fire / pop now and again. 

 

Also it made the bike more course, not smooth and controlled but raggy / harsh.

 

Try them see what you think.

 

Ivan

[ChrisG]

Another vote for Fuel, well made and come with the centre stand stop bracket which the MTC's I also considered didn't have.  Straight swap and they don't foul by pannier which was one of my main worries with aftermarket pipes.

[RogerD]

@Luke:  may have been, I think it was a Silver 9er from memory, 2 up. Weekend before last? And yes it was Quatt.

Edited by RogerD, 17 September 2014 - 10:36 am.