At 07:27 PM 9/16/98 -0500, you wrote:
>So with this talk of nitrous, then manifolds, you all have pretty much
>lost me. The manifold is below the TB, right? (this uncertainty should
>tip you off to how little I know here) so what does the manifold do, and
>why exactly would a performance one be safer/better to have nitrous
>with?
>What I'm asking for is a long post from one of those guys who knows
>everything, like Frank, half of which will be over my head anyway, but
>I'll get enough so I can get the gist and talk like I know something.
>Later,
>Robert
>
Yep, the manifold is what the throttle body bolts to. Basically, its
function is to direct air from the throttle body to the top of the heads,
where it is pulled in through the intake valves. In fuel injected engines
like ours, the injectors spray fuel into the heads at the bottom of the
intake manifold. (I think... I'm a little fuzzy on this part myself...)
So, in our engines, the purpose of the intake manifold is to flow air.
However, in a carbeurated engine, fuel is sprayed down the intake manifold
at the top, so it has to flow both fuel and air.
The safety aspects of using the Magnum MPI intake manifold over the
stock one (when using a wet nitrous system) come in to play because the
stock manifold was designed to flow air, not fuel. It is possible that if
you were to spray fuel down through it, it would puddle, and these puddles
could be ignited by a backfire through the intake and throttle body. The
Magnum MPI manifold, on the other hand, is a "wet" manifold. It was designed
to flow both air and fuel, so it shouldn't allow puddles to form, greatly
reducing the chances of an explosion in your intake manifold should there
ever be a backfire through the intake and throttle body.
The only reason this comes into play at all is because fuel is being
injected through the intake. This isn't an issue at all for a system
such as NOS's for '92-93 Dakotas, because in that system, only nitrous
and air flows through the throttle body. There's no fuel to puddle.
-Jon-
.--- stei0302@cs.fredonia.edu ------------------------------------.
| Affiliations: DoD, EAA, MP Race Team, NMA, SPA, USUA. RP-SEL |
| '96 Dodge Dakota v8 SLT CC (14.80@92.97), '96 Kolb FireFly 447 |
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