Anyone fitted a motorbike back box to a fiat? i can get a EU sticker to put on it to get through mot, but worried about emmissions.....

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=25623&item=7987718442&rd=1

It won't effect emmissions.

even the hollow cans?

That's what a race exhaust is, hollow.

Even a Janspeed / Peco etc, they're all straight through pipes. The silencer (the cherry bomb bit) contains perforated tube with wadding that absorbs the sound a bit to bring the noise down.

You do realise you'll probably actually lose power by fitting a bike can right?

lol mind change - custom chrome in nuneaton.... (i wanna get an exhaust today... just woke up and decided hehe)

custom chrome are just round the corner from me they are **** they have worked on a few of my m8s cars and almost all of them have had 2 go back ver and over again as they alwayz end up blowing and one of them his backbox even cracked i'd say go powerflow

matt~black said:

custom chrome are just round the corner from me they are **** they have worked on a few of my m8s cars and almost all of them have had 2 go back ver and over again as they alwayz end up blowing and one of them his backbox even cracked i'd say go powerflow

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TBH I probably wouldn't use either. The welding on the CC silencers I've seen ain't the best, and a fair few people have had trouble with Powerflow.

Motorbike exhausts are set for peak power at revs where the 1108 disintegrates. Torque delivery will suffer heavily. Bets bet is still Supersprint.

Oldschool said:

Motorbike exhausts are set for peak power at revs where the 1108 disintegrates. Torque delivery will suffer heavily. Bets bet is still Supersprint.

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Not when intalled on the rear of a car, race cans use tuned lenght to produce peak power, if you make it longer it changes. Basically they are not designed for cars since most use glass packing which causes major back pressure on cars (this is done to overcome the short lenght used on bikes)

smokeme said:

which causes major back pressure on cars

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The main reason why they are unsuitable for cars.

Liam

http://customer1.mysite.wanadoo-members.co.uk/

Bit of a trek but you could make a day of it.
My boyfriends friend had her polo done there and they did a superb job.

search for MIJ Performance in Walsall, they're fan-tastic imo, did me a twin exit zorst on sei for £370 and chucked in free fish n chips from chippie, and even the backboxes were custom made

hi, is this the kind of thing you were considering. i saw this on ebay ages ago and saved the pics for some reason.

matt

notice the yellow cinq in the pic alex??

have seen a few bike cans on cars, i always thought they where imitation though

Be careful tho, the Plod really don't like exposed backboxes (they get hot and children could touch them)

gaz_wrexham said:

notice the yellow cinq in the pic alex??

have seen a few bike cans on cars, i always thought they where imitation though

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https://www.fiatforum.com/showthread.php?t=35849

smokeme said:

Not when intalled on the rear of a car, race cans use tuned lenght to produce peak power, if you make it longer it changes. Basically they are not designed for cars since most use glass packing which causes major back pressure on cars (this is done to overcome the short lenght used on bikes)

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Sorry,

But i have designed exhaust systems, which is part of my job. You will never design a system from back to front. As the individual cylinder capacity, exhaust closing angle and peak power point are the three most important parameters as well as the out of these calculated primaries (lenghts and diameters) determine the rest of the system, the 'can's' dimensions are a result of the desired set-up of the rest of the system. Unfortunately this is only the principle and requires in virtually all cases a lot of finetuning as cars never have the optimal shape for the exhaust design.

Oldschool said:

Sorry,

But i have designed exhaust systems, which is part of my job. You will never design a system from back to front. As the individual cylinder capacity, exhaust closing angle and peak power point are the three most important parameters as well as the out of these calculated primaries (lenghts and diameters) determine the rest of the system, the 'can's' dimensions are a result of the desired set-up of the rest of the system. Unfortunately this is only the principle and requires in virtually all cases a lot of finetuning as cars never have the optimal shape for the exhaust design.

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My uncle builds custom performance exhausts for bikes and he says they are tuned lenght, this becomes even more important in 2 stroke bikes since they have no valves and rely on exhaust pulses to fill the cylinder. Why do you think the longer exhausts have smaller pipes

2-stroke reciprocating engines are a completely different matter altogether. The principles that apply to them are much more complex than 4-stroke reciprocating piston engines.
The 4-stroke engines on motorbikes to start are much more fragile units with far more technical inconveniences. I have not denied that you can tune backboxes. The technical solution is not to take something and try to make it with the other end (engine). It will lead to too many coimpromises that throw the original idea of tuning out of the window. This approach can in the best case only second best.
The best solution here is to start from scratch rather than technically bodging it together. You mentioned that your uncle said that the boxes are tuned to a length. How on earth can you expect to have the right length for the engine that it is intended in this particular thread as the cam timing and peak power popint of a motorbike engine is rather different to say the least.
The fact remains that you can work only from front to back.