4CN Air

iTrader: (7)

Do you think a screen could be made that would fit in between the turbo manifold and turbine inlet that would do the follow:

1.) withstand the heat without breaking down
2.) not affect flow
3.) be strong enough to block a projectile apex seal

even if it had to be made of soem exotic material and cost $100 many would buy one


just a crazy 5am thought

rotorbrain

a screen could clog with carbon build-up. . . i dont think it would be beneficial even if it DID hold up to the heat.

dgeesaman

iTrader: (7)

An interesting idea, but I think rotorbrain's right: fine enough to catch the destructive shards of apex seal = clogging with carbon. But my engine doesn't run that rich - I suspect it would be fine.

Dave

WaLieN

Agreed. Not to mention the "shards" would fly back into the housing, thus creating more damage on possibly salvageable parts. Also, it would be an incredible restriction in exhaust flow.

dgeesaman

iTrader: (7)

It's hard to predict. A fine screen (if clean) would not present much pressure drop. The main cat restricts in way that would be similar to screen that is several inches long, and that's not a big deal.

However, the flow is pretty tightly choked through the exhaust port, so the flow velocity is much higher than thru the cat. Such a screen should be located at the widest possible point between turbo and engine. I have to think that a thin screen upstream of the turbos would be less restrictive than the fat-old precat was, even if it's located in a narrow area where the flow velocity is high.

It would also increase turbulence in the flow, which could hurt the efficiency of the turbo. But I don't know any specifics to guess whether it would be significant.

Since these things are opposing factors, I conclude nothing I'm not sure that doing some calculations would mean much, either.

Dave

WaLieN

Yes, it would be difficult to calculate (I would assume). But wouldn't you agree that any restriction prior to the turbo would result in negative effects?

dgeesaman

iTrader: (7)

Yes, indeed it would cause some and restriction is bad from a performance point of view. I just wonder if it would be significant (as in more than, say, 1% power change).

Dave

WaLieN

I would that the figure would depend on the wastegate and size of turbos. Though, this is just a guess. This scenario is too difficult to even guess, due to all the variables involved.

I think 1% may be true for extremely small turbos on applications where exhaust flow was already greater than the needs of the turbo.