Lloyd Sumpter wrote:
On Tue, 09 Dec 2003 02:33:31 +0000, F330 GT wrote:


So...if you want to play with TC-3 oil, snort oil fumes, sacrifice
fuel mileage, and endure the noise for a superior hole shot, the 27 to
3 vote is probably right on target. You'll be much happier with the 2
stroke.

I don't get it, but different strokes for different folks.....


Everyone in the marine industry and most of its environmental critics are aware
that there are now at least four manufacturers of two-cycle outboards with DFI,
direct fuel injection: systems that put the fuel directly into the combustion
chamber after the intake and exhaust ports close.


Some interesting data. But I'm confused. If the fuel is injected directly
into the combustion chamber (and I assume immediately burned), how does
the crankcase get lubricated?

By tiny amounts of oil being directly inject into it below (actually
through the bore at the piston's side) the piston, raw oil with no fuel
(some of the DFIs have an even tinier amount of oil mixed in the fuel
but this is just to lubricate the injection system/pump itself)

Is there oil in the "fuel" that's injected?
Why?

Save mentioned; no none to lubricate the engine itself.


Now, you say a DFI 2-stroke has better emissions than a 4-stroke. I infer
that you're talking about a carburated 4-stroke - what about a DFI
4-stroke (like most 4-stroke motorbike engines are, I believe)?

No the 4 strokes are mostly EFI not DFI. There are a couple of DFI 4
strokes, Mitsubishi has been playing with it & also Mercedes but so far
it's been shown not to be worth the extra trouble & causes new problems,
EPA & power wise.

As long as
a 2-stoke burns oil, I can't see how it will do better, emission-wise,
than a comparable 4-stroke (ie carb-to-carb, DFI-to-DFI, etc).

They only inject a tiny amount in the crankcase of the DFI, even less
with the latest consumer funded experiment called E-tech (ficht in
drag:-)) The "claim" (probably false yet again) that running hour for
running hour they'll use less oil that the 4 strokes (change intervals)

And, again by experience: I have yet to see a 2-stroke outboard that
doesn't smoke like hell at idle. And I see a lot of outboards at launch
ramps, marinas, etc. Maybe nobody's buying these DFI outboards?

No nobody who has made any sort of independent enquiries. They run very
lean mixtures at low revs to get through the EPA & so they heat the
pistons with abnormal combustion when lean, when the engine is returned
to "normal" mixtures & power is increased the pistons are hot enough to
provoke uncontrolled detonation & failure. OMC itself admitted to a 1 in
5 failure rate & none of the so called fixes including the latest, has
addressed the core issues. Their latest joke is stronger pistons!!! It'd
be funny were it not consumers paying for this BS.

Don't buy evinrude not ever, they're rude!!!

K

See remembered no Harry paste:-)


Lloyd Sumpter
"Far Cove" Catalina 36