Durability of direct-injected 2-Strokes

[josip_voyager]

Somewhere on this forum (of course that I can't find it again) I've found that modern direct-injected (under high pressure) two strokes are not durable. Since many famous 2-stroke outboards are direct-injected (like for example Mercury Optimax, Evinrude FICHT-RAM and E-tec, Yamaha HPDI and Tohatsu/Nissan TLDI), I would appreciate if anybody can confirm and explain it from his own experience.

 

[JB]

Re: Durability of direct-injected 2-Strokes

Hi, Josip.<br /><br />I think you may have been reading too much into previous posts.<br /><br />The Ficht RAM injection system had development problems in the V6 OMC engines. It has been redesigned by Bombardier, is no longer called Ficht, and now seems reliable.<br /><br />Mercury's Optimax system also had development problems. They seem solved now.<br /><br />I know of no problems with the Yamaha HPDI or Tohatsu TLDI systems. The E-Tec system is too new to make any evaluation at all.<br /><br />Since DFI in 2 strokes has been around for only 6 or 7 years I think it is too early to conlude anything about durability. <br /><br />They have proven to be cleaner running and more economical than carbs, and my impression is that they seem to have fewer problems with starting and fuel related partial power loss than carbed engines.<br /><br />I do know of a few problems caused by users not using the required oil in some DFI engines.

 

[ISkiH2O]

Re: Durability of direct-injected 2-Strokes

Pretty common with any new technology to have some issues arrise when they hit market.<br /> I remember my first CD player skipped easily and often brand new CD's wouldn't play. My first VCR constantly needed tracking adjustments, ate tapes, needed cleaning. Remember the cars in the late 70's, The "brain box" would go bad and leave you stranded, the mechanic would shrug his shoulders, scratch his head and replace the ECM.<br />TV's used to need service quite regularly, now most of teh repair shops are gone.<br /> Also think about software, any of the windows introductions.