Weight of DFI 2-strokes

swist

Senior Chief Petty Officer
Joined
Jul 1, 2004
Messages
678
This weight increase issue is really bugging me, being in the market for a 225 repower sometime soon.<br /><br />My o/b is on a bracket and one of the disadvantages of the bracket is that the effect of even a little extra weight that far back is magnified....<br /><br />I can understand why a 4-stroke is a lot heavier - it's got tons more parts and is a completely different beast, but my question is why are the new DFI 2-strokes (from all the manufacturers as far as I can see) also considerably heavier than their carbed counterparts? My 1993 carbed 225 Yam weighs only 400 lbs - looking at current DFI engines in the 200-250 hp range, no one comes close to that weight? Why does pitching 3 carbs and putting in a DFI pump net gain 75-100 lbs? Is there something else different in DFI engines compared to carbs? Do the blocks need to be heftier?
 

Drydocked

Cadet
Joined
Jul 10, 2001
Messages
24
Re: Weight of DFI 2-strokes

If you look at current model years, that weight difference is not so much. Yamaha 200 HP carb is 453, the HPDI 200 is 466. See:<br /><br /> http://www.yamaha-motor.com/product...ar=2005&cat=Two+Stroke+Series&scat=High+Power <br /><br />and <br /><br /> http://www.yamaha-motor.com/product...4&but=154&year=2005&cat=HPDI+Series&scat=HPDI <br /><br />As compared to Evirunde ETEC, the 200 HP ETEC is 516 lbs, but then so are the 225 and 250 ETECs. The 250 HP ETEC is actually a bit lighter than the Yamaha 250 HP HPDI.
 

swist

Senior Chief Petty Officer
Joined
Jul 1, 2004
Messages
678
Re: Weight of DFI 2-strokes

Looks to me like the carbed motors have gained some weight too.
 

seahorse5

Rear Admiral
Joined
Jan 24, 2002
Messages
4,698
Re: Weight of DFI 2-strokes

In the 225-250hp 2-stroke class:<br /><br />Johnson 225-250 carb 450#<br /><br />Merc EFI 460#<br /><br />Yamaha 225-250 EFI 490#
 

seahorse5

Rear Admiral
Joined
Jan 24, 2002
Messages
4,698
Re: Weight of DFI 2-strokes

In the 225-250hp 2-stroke class:<br /><br />Johnson 225-250 carb 450#<br /><br />Merc EFI 460#<br /><br />Yamaha 225-250 EFI 490#
 
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