JCB engine uses ‘mini-SCR’ to meet Tier 4 Final
The small SCR will replace the silencer in many installations
JCB says its Ecomax Stage 4/Tier 4 Final engine can be engineered into many existing machines without needing additional space by using a ‘one can’ selective catalytic reduction (SCR).
According to the company’s chief technology officer, Tim Burnhope, in many cases the mini SCR on the Stage 4/Tier 4 Final Ecomax engine can be positioned in the same space occupied by the exhaust silencer on previous generations.
He said, “Our engine is already so clean that we only need 2% to 3% of urea, which allows us to use a very compact SCR system. Many of our competitors have two or three canisters – one for the SCR, one for a DOC and another for a DPF – and that requires a lot more space.” Our SCR is so compact that, in many cases, there is no need for any bodywork alterations.”
The new engine is said to be 5% more fuel efficient than the Stage IIIB/Tier 4 Interim version, which is itself some 10% more economical than the Stage IIIA version. In its Stage IIIB/Tier 4 Interim guise the Ecomax engine has exhaust gas recirculation and variable turbocharger geometry but does not require a DPF. Power ratings now go up to 129kW, meaning JCB is now fitting the Ecomax in excavators up to the 22tonnes operating weight JS220.
According to Burnhope, the Ecomax is 10% more fuel efficient than the engine it replaces and would save a typical JS220 owner €5,200 in fuel over three years.
When asked during a press conference if a six-cylinder version of the Ecomax was likely in the near future, the company said, “We consider all options and the deciding factor is whether it will save the customer fuel.”