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[Bulldog67]

ubelievably the 401 is in the CJ (with teethin problems naturally) so gonna try and be organised and sort the exhausts.

Its got hedman headers, and really first question is will it go thru an mot if the pipes are just straight thru?

Secondly, anyone got a steer for anything in this country?

Cheers

[Mike Pavelin]

There is no requirement to have silencers, but if the tester considers it to be too loud it will fail.

[Bubba]

cherry bomb

[Bulldog67]

cherry bomb

meaning?

There is no requirement to have silencers, but if the tester considers it to be too loud it will fail.

is that just on their opinion or is there a decibal limit Mike?

[Bulldog67]

Nosebolt: did Tonka go thru the MOT with the pipes u had on (and off and on and off  ) at compton?

[isle of man]

The EU has a ruling on noise...

[Bulldog67]

we need the facts & figures men: vospa dave & vospa panic

was gonna get them custom made but dunno if im financially in that bracket at the moment 

[Nosebolt]

Nosebolt: did Tonka go thru the MOT with the pipes u had on (and off and on and off  ) at compton?

yea but got an advisory on a little blow from the maifold

[Bulldog67]

but no noise issues, and they be loud

pet mot dood?

[Nosebolt]

garage is owned by a m8 but the tester who works for him wont pass anything that will get him into trouble, infact he failed it last time and i had to sort a wheel bearing and the lights, besides I like to have a real test to check my work

[Bulldog67]

cherry bomb

ok, worked that bit out, but which one?

[Dave69]

there is a set noise limit for new cars that are sold to the public, but as soon as the vehicle is sold you can fit whatever you want in regards to silencing but you are limited by age related legislation and cat convertors requirement.

but with old cars it is basically open season to fit whatever you want. the only et all is that the mot tester can fail it on the noise, but only if there is another vehicle of the same type with a quieter exhaust next to it.


as for noise at the tail pipe, there is a database of information for this on new cars (this was started back in 1990) but it couldn't be implemented due to cost as it would involve training plod and issuing noise meters which need to be calibrated acordingly for a price so the idea was shelved.

common sense states if it is too loud then you will get pulled for a chat by mr plod.

[Mike Pavelin]

cherry bomb

meaning?

There is no requirement to have silencers, but if the tester considers it to be too loud it will fail.

is that just on their opinion or is there a decibal limit Mike?

There are no published limits, but the tester has to judge whether the noise level is reasonable compared with standard vehicles of a similar type. Common sense says silence it to an extent that it isn't too loud idling or when toodling along a residential street on a light throttle. A tester also has to consider that if that vehicle is subsequently inspected by VOSA for some reason, the first thing they will ask is "what c*nt passed it with that exhaust?"  

[Dave The Sparky]

Bubba has spoken

http://cgi.ebay.co.uk/US-Cherry-Glasspack-Exhaust-Bomb-8-Body-x-2-ID-/380165796384?cmd=ViewItem&pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5883a5b220

[Panic mechanic!]

we need the facts & figures men: vospa dave & vospa panic

who the fuck are vospa? isn't that an italian moped? surely you don't mean vosa ( the gods of all things technical and boring?)

[Bulldog67]

Bubba has spoken

http://cgi.ebay.co.uk/US-Cherry-Glasspack-Exhaust-Bomb-8-Body-x-2-ID-/380165796384?cmd=ViewItem&pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5883a5b220

so, is there a reason why 2" would be better than 3" outlet?

[Bulldog67]

we need the facts & figures men: vospa dave & vospa panic

who the fuck are vospa? isn't that an italian moped? surely you don't mean vosa ( the gods of all things technical and boring?)

see, i rest my case, u know all that borin tech vosa stuff  :003

[Panic mechanic!]

Only cos I have had to deal with them and sometimes knowing all the boring techie stuff  saves you ending up with a big fine.Remember in the age of the internet  ignorance of the law is no excuse but it also helps you to bend the rules. Know your enemy!

[Bulldog67]

cherry bomb

come on come on Bubba or anyone, u know i is impatient innit, what diameter & why please?

[Bubba]

they be fruity without being over loud  as for 2" or 3" its up to you mine are 2" but with a 4inch welded over them they are not the best thing for torque but you aint gonna be short with a 401

[darknight]

Ok a 3" outlet would be better, but also a wide bore 3-4" inlet (airflow) as well, this will aid the release of gas the best, I take it is a v8?
I used to race, not jeeps, but you will for road use still require some back pressure, so maybe a small box 3/4 of the way down, my skyline was tested at around 3-4 thousand revs at 110-120 db, and always past for road use on every mot, this is because they don't test them like you revving the nuts off it, but I also used a 5" back box, this will give it a deeper growl, a 2" will make it louder, and higher pitched.
Most important is the back pressure, without it it will backfire and or run poor, is that any help?

[Bulldog67]

yup its a V8 

so wider is better, but with a back box, correct? I take it a cherry bomb doesnt count as a back box? any recommendations please? sadly i want a decent old iron V8 growl as well as performance

[darknight]

Well width is a matter of taste as well, for me I would split, them one each side, running 3" all the way, a bomb could do it maybe as they are quite cheap as a box, then continue down to the back where a nice, tail pipe would look good.
Or you could try the 3" all the way to the back with a custom 3-4" proper back box.
You don't need a massive amount of back pressure but you do need some, to be sure I would go first for the 3 all the way to the back with a nice custom box and pipe of the size you like, if then it's too loud/ noisy you could cut somewhere in the middle and put a small box in

[Dave The Sparky]

Bubba has spoken

http://cgi.ebay.co.uk/US-Cherry-Glasspack-Exhaust-Bomb-8-Body-x-2-ID-/380165796384?cmd=ViewItem&pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5883a5b220

so, is there a reason why 2" would be better than 3" outlet?

Thats just a sample bulldog have a look on his ebay shop there are loads of different lengths and diameters of cherry bomb i have a 2.5 incher thats 18 inch long on the turbo diesel cj works a treat

[Bulldog67]

Cheers doods, so we are gettin there, 3" pipes going into a 3" cherrybombs about 3/4's of the way down the pipes, it is also my intention to have the pipes coming out of the rear (noise displacement better for me), so, last 2 questions (I think):

are there any practicality issues with havin the pipes go out of the rear (most CJ's seem to have them wither just behind front wheels or just in fron of rear)?

and ref the cherrybomb, quick look at that ebay shop Dave recommended (2nd time in a month i have been pointed towards that ebay seller), the 3" bombs come in lengths of 18", 22" & 30": what difference do those sizes make?

Much appreciated