Vornado, etec, fi etc questions

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edwardh1

Petty Officer 2nd Class
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Nov 26, 2003
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I tried to post in the engines but can not.
for engines made in the last 3 or 4 years what type fuel system do these engine have?
etec?
Vornado
optimax
Std Yamaha.
I know what FI is (injected into the intake manifold)
and HPDI - is injected into the cylinder itself, but what type system is on these other engines?
 
seabob4

seabob4

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Re: Vornado, etec, fi etc questions

The Verados (note spelling) and Yam 4-Strokes are MPI, the Opti's are DI...
 
commander315

commander315

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Re: Vornado, etec, fi etc questions

Im not sure about all of them..but heres what I know:
Verados (Supercharged) and Regular Yamahas are Multi-Port. Optimax is Direct
HPDI is just High Pressure Direct Injection
E-tecs are also MP (I believe) but have a high tech computerized injector that manages the amount of fuel fed to the engine. (Supposedly more efficient)
 
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edwardh1

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Re: Vornado, etec, fi etc questions

seems the direct injected ones would need a strong pump?
And is direct injection a 2 stroke thing?
 
seabob4

seabob4

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Re: Vornado, etec, fi etc questions

Direct injection motors inject fuel under very high pressures, atomizing at low RPMs, becoming homogeneous at higher RPMs. Injectors can see pressures as high as 750 PSI...
 
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edwardh1

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Re: Vornado, etec, fi etc questions

is direct injection only on 2 strokes?
 
Silvertip

Silvertip

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Re: Vornado, etec, fi etc questions

DI is not just a two-stroke thing. It is being used on many automobiles today. It is essentially the third generation of fuel injection. Gen 1 = throttle body, Gen 2 = port. Gen III = Direct. Diesels have been doing it for years. Cars are more recent. Four stroke outboards tend to be port injected.
 
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edwardh1

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Re: Vornado, etec, fi etc questions

what prevents water in the ethanol from rusting the high pressure pump parts?

In the late 70 s oldsmobile had a diesel engine with an injector pump and many many of the pumps failed due to rust from the water in the diesel fuel causing rust
 
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