Middle silencer boxes on 280?
Discussion
Hi Jon, thats a very well cared for car you have there. I can't remember, does the 280 have a single central box feeding into 2 separate boxes at the back?
I do remember that our 280 always sounded quiet (well compared to most of the RV8 cars anyway) so anything you can do to liberate some of that V6 noise has got to be worthwhile.
I do remember that our 280 always sounded quiet (well compared to most of the RV8 cars anyway) so anything you can do to liberate some of that V6 noise has got to be worthwhile.
According to the 'bible', the earliest 280s (like mine)
only had one silencer anyway, the one in the middle of the car, UNDER the propshaft. Later cars (up to Sept 81) had single box OVER propshaft.
Cars from Sept 1981 onwards used a 'Langford' system, with two boxes under the centre of the car, and two at the back.
I think you need to start counting silencers.
If you have the single silencer system, and get rid of that one, then it will of course make a hell of a din, as it will be UNSILENCED.
Mine has the early system, but in stainless steel, and is definately NOT quiet.
only had one silencer anyway, the one in the middle of the car, UNDER the propshaft. Later cars (up to Sept 81) had single box OVER propshaft.
Cars from Sept 1981 onwards used a 'Langford' system, with two boxes under the centre of the car, and two at the back.
I think you need to start counting silencers.
If you have the single silencer system, and get rid of that one, then it will of course make a hell of a din, as it will be UNSILENCED.
Mine has the early system, but in stainless steel, and is definately NOT quiet.
Mine is an 84 model and it has 4 silencers!
The pipes exit the engine bay either side, run past the gearbox and go into a silencer under each seat (nice in the winter but burns your bum in the summer so I've been told)
From here they wind their way through the chassis over the swing arms to two more silencers just before the tail pipes.
I am hoping the rear boxed will supply sufficnet silencing. I guess I could give it a go if the straight thru pipes are not too expensive.
I certainly sounds better now there is a leak on the one under my seat!
The pipes exit the engine bay either side, run past the gearbox and go into a silencer under each seat (nice in the winter but burns your bum in the summer so I've been told)
From here they wind their way through the chassis over the swing arms to two more silencers just before the tail pipes.
I am hoping the rear boxed will supply sufficnet silencing. I guess I could give it a go if the straight thru pipes are not too expensive.
I certainly sounds better now there is a leak on the one under my seat!
grahamw48 said:
According to the 'bible', the earliest 280s (like mine)
only had one silencer anyway, the one in the middle of the car, UNDER the propshaft. Later cars (up to Sept 81) had single box OVER propshaft.
Cars from Sept 1981 onwards used a 'Langford' system, with two boxes under the centre of the car, and two at the back.
I think you need to start counting silencers.
If you have the single silencer system, and get rid of that one, then it will of course make a hell of a din, as it will be UNSILENCED.
Mine has the early system, but in stainless steel, and is definately NOT quiet.
nor is mine quiet in fact 1 mot station once tried to insist that i had 2 silencers made for the tailpipes as it was too loud, i showed him the schematic from the parts manual and he conceded that i hadn't modded it to make it noisy
thegamekeeper said:
Buy a NEW system without the silencers under the seat, a central silencer box, and without the rear silencer boxes which cause the system to rub on the drive shafts. £350 plus carriage plus vat in stainless steel, guaranteed for life. sTeVeR
Yep, that's the one I've got.
I'm back! (been a bit busy)
Well, I've fitted the straight thru pipes. Just another day spent under the car, (wifie thinks I've got some oily other woman under there)
Sounds Grrrreat, got a really nice rasp now and loads of popping on overrun, excellent, music to the
Also just tested the noise and it's only 80 odd dB at 1m from the pipes.
All round a great success.
I also discovered you can use silicone sealer on the joints, keeps it's elasticity even when exhaust is up to temperature and makes a really god seal.
Next investigate the slight tendency to pull to the right under braking.
Before anyone says anything I've already done the disks, calipers, pads & hoses
.
Well, I've fitted the straight thru pipes. Just another day spent under the car, (wifie thinks I've got some oily other woman under there)
Sounds Grrrreat, got a really nice rasp now and loads of popping on overrun, excellent, music to the
Also just tested the noise and it's only 80 odd dB at 1m from the pipes.
All round a great success.
I also discovered you can use silicone sealer on the joints, keeps it's elasticity even when exhaust is up to temperature and makes a really god seal.
Next investigate the slight tendency to pull to the right under braking.
Before anyone says anything I've already done the disks, calipers, pads & hoses
. 
The colonel said:
I also discovered you can use silicone sealer on the joints, keeps it's elasticity even when exhaust is up to temperature and makes a really god seal.
I never knew that - something new learnt
Anyone else used it on exhausts?
I think it needs to be RTV for the temp. JP Exhausts use it so I guess it must work OK.
I've got some silicon sealant rated at 250 deg. C. for use on fireplaces etc., although I've never thought to use it on exhausts. Not sure that it would be up to the manifold to centre box joints though. Anyone know whether the acetic acid curing agent which a lot of these sealants release affects the finish of stainless steel?
Paul.
Paul.
I've got some silicon sealant rated at 250 deg. C. for use on fireplaces etc., although I've never thought to use it on exhausts. Not sure that it would be up to the manifold to centre box joints though. Anyone know whether the acetic acid curing agent which a lot of these sealants release affects the finish of stainless steel?
Paul.
Paul.
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