BogMonster Posted December 31, 2011 Share Posted December 31, 2011 1993 2.5 Petrol 90 because a) it was LEZ compliant That has got to be a loophole Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted December 31, 2011 Share Posted December 31, 2011 the unpleasant vibes are most likely because of the routing of your exhaust. It won't be touching but close proximity causes BAD vibes... Quote Link to comment Share on other sites More sharing options...
farmerboy_y2k Posted January 1, 2012 Share Posted January 1, 2012 It does sound like there is something wring with either your engine or how its fitted. It shouldn't vibrate at idle any more than the 2.5NA did and shouldn't be much louder. Quote Link to comment Share on other sites More sharing options...
Smokydiesel Posted January 1, 2012 Author Share Posted January 1, 2012 the unpleasant vibes are most likely because of the routing of your exhaust. It won't be touching but close proximity causes BAD vibes... I used the Steve Parker downpipe and a complete new exhaust for a 2.5 TD (mine was a NA). It isn't touching, but the silencers are a different shape (NA had flat/oval silencer, TD has a big round pot) So the whole exhaust might indeed be closer to the floor and chassis. I made up some new exhaust hangers because the chassis brackets on the NA-layout are different from the TD setup. Used plenty of rubber though.....I think.. How would the new exhaust create the vibrations ?...simply because the noise-source is closer to the floor ? How could I tackle this...? Cheers, Edwin Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted January 1, 2012 Share Posted January 1, 2012 fill an transparent bottle with water (about half full) remove the sound proofing and place it on it's side on the floor at tickover (wedge it to hold it steady). This gives you a nice cheap vibration measuring device. You can locate centres of vibration. It looks like a Tyranasaurus is tap dancing.... Quote Link to comment Share on other sites More sharing options...
Tanuki Posted January 1, 2012 Share Posted January 1, 2012 I used to run a Lightweight that had been fitted with a 5-bearing 2.5, 3.54 diffs and an overdrive: it could happily be cruised at 75MPH all day with about 2200RPM showing on the revcounter. Would do 70MPH in direct-3rd, which was good enough to frighten a few of the Escort XR3i brigade on long uphills. Same goes for the 2.0 MPi petrol Discovery I had a while back: it was significantly faster than the TDi Disco s the rest of the team chose. You just need to adapt your driving-style. A petrol engine generally has a broader and overall less-peaky torque/power delivery than a similar-capacity turbodiesel. I'd rather have 100BHP available between 2000 and 5500RPM than 150BHP between 1500 and 4000RPM with an 'aggressive' rev-limiter calling an abrupt halt to fun at higher RPM. Have you thought of a 2.5 Petrol with the comp. ratio pushed to about 9.5:1 and a decent multi-point injection system ? (Megasquirt/Megajolt) ?? That could work out rather well. --Tanuki. Quote Link to comment Share on other sites More sharing options...
LCJ Posted January 2, 2012 Share Posted January 2, 2012 That has got to be a loophole Surprisingly its not. In Boris' eyes, the emissions are less, even though it's using twice as much fuel as a tdi! That is the madness of the LEZ! Quote Link to comment Share on other sites More sharing options...
Diff Posted January 2, 2012 Share Posted January 2, 2012 Surprisingly its not. In Boris' eyes, the emissions are less, even though it's using twice as much fuel as a tdi! That is the madness of the LEZ! LEZ is to do with particulate emissions, not Co2 or general economy. Petrol engines, regardless of their fuel consumption produce very few particulates. Diesel engines in cities are very bad news for public health due to the particulates. The UK is unable to meet European air quality targets and stands to have to pay many millions in fines. The LEZ is a 'too late' attempt to improve air quality in London. Instead of admitting that low Co2 from diesel engines doesn't make them 'green', for years the government has been promoting diesel vehicles as environmentally friendly because they produce slightly less Co2 than petrol, despite the fact that they produce a load of other harmful emissions. I have nothing against diesels, but they are worse than petrols in cities where people live and work. LPG is much, much better than petrol or diesel in cities with regard to air quality, and electric better still. Regards, Diff. Quote Link to comment Share on other sites More sharing options...
rusty_wingnut Posted January 3, 2012 Share Posted January 3, 2012 and if you swap the engine to a diesel you become liable for it? Unless of course it is a csw and you can prove it..... Quote Link to comment Share on other sites More sharing options...
LCJ Posted January 3, 2012 Share Posted January 3, 2012 and if you swap the engine to a diesel you become liable for it? Unless of course it is a csw and you can prove it..... Strictly yes. Although for that to happen the DVLA would have to tell TFL once you registered the engine swap, and TFL would then have to update their records. Might seem unlikely, but I'm not going to risk it and will just stay clear of the LEZ Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted January 3, 2012 Share Posted January 3, 2012 Strictly yes. Although for that to happen the DVLA would have to tell TFL once you registered the engine swap, and TFL would then have to update their records. Might seem unlikely, but I'm not going to risk it and will just stay clear of the LEZ You have 28 days grace. So drive in and see what happens. From the LEZ website http://www.tfl.gov.uk/roadusers/lez/17703.aspx#container Warning letters We will issue a warning letter to the registered keeper of a vehicle that doesn't meet the Low Emission Zone (LEZ) emissions standards on the first occasion it's observed in the LEZ. This is provided it's not exempt, has registered for a 100 per cent discount or has paid the daily charge. If the same vehicle is driven in the LEZ within a 28-day period from the date of issue of the warning letter, a Penalty Charge will not be incurred. After this 28-day period you risk being issued a Penalty Charge Notice (PCN) if you drive in the zone and your vehicle still doesn't meet the required emissions standard. In the event of a change of keeper after the warning letter has been issued, any new keeper will not be issued a further warning letter. If the 28-day period after the warning letter has expired, a PCN will be issued to the registered keeper at the time of the contravention. If you believe the warning letter has been issued in error you should contact us on 0845 607 0009 Quote Link to comment Share on other sites More sharing options...
Smokydiesel Posted January 4, 2012 Author Share Posted January 4, 2012 fill an transparent bottle with water (about half full) remove the sound proofing and place it on it's side on the floor at tickover (wedge it to hold it steady). This gives you a nice cheap vibration measuring device. You can locate centres of vibration. It looks like a Tyranasaurus is tap dancing.... Sounds like you've had this problem before and have become an expert I did do the bottle-test and I noticed a lot of vibrations on the left hand side of the car, near the seatbox. This is about where the middle silencer is located..... I could twist the silence a 180 degree, so it moves away from the floor (pipework is welded off-center on the silencer) Do you think that will help ? At the moment the complete exhaust is suspended at just two points, one behind the rear silencer and one just behind the middle silencer. From the middle silencer up forward it's a solid pipe......could that be to rigid ? Always wondered why the 300 tdi exhaust has that flexi bit at the front end, and the 200 TDI doesn't.. Any idea's would help, thanks !! Edwin Quote Link to comment Share on other sites More sharing options...
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