Plenum v Throttle bodies

[AntonyJ]

So what is the thought on this from Elliots site?

[rev-erend]

Pointless.

You still have the original manifold under it.. and the throttle butterflies further restrict the air flow (more that a single large butterfly would)..

[CrashTD]

Probably about to step out of my depth here but -

Not sure on dimensions but surely 8 small TBs will allow a larger volume of air than a single large one. unless the original TB is massive. Factoring in the fact there are now 8 butterflies obstructing the air-path.

Either way it look like he has knife edged the area where 2 opening touch which is bad for air flow.

With the design is a plenum chamber going on top? If so where is the air feed as I can foresee some issues

Great piece of engineering anyway

[spend]

CrashTD said:

..Either way it look like he has knife edged the area where 2 opening touch which is bad for air flow.

Is that a bad thing? I can visualize that you would otherwise be robbing or even sucking up the stale charge from the adjacent port? particularly with the 4365 sequence.

[CrashTD]

I was more a general statement referring to knife-edges rather than this specific application.

moving air hitting a knife edge is found to swirl, opposed to a streamlined symmetrical edge, where air would want to accelerate over the edge increasing velocity.

[eliot]

Nice bit of engineering, but it looks restrictive to me.

[trackcar]

They work ..

http://uk.youtube.com/watch?v=YvKP8acievU

[350Matt]

C'mon then Jools what did it pull then?


Matt

[AntonyJ]

trackcar said:

They work ..

http://uk.youtube.com/watch?v=YvKP8acievU

So just a plenum on top with TB removed and no AFM ?
What size are the TB holes?
Cool..

[Pete500]

The actual pic is from my old RV8. With H404 cam it made 307rwhp. No AMF, Autronic SM2 EMC. The TBs made it more driveable. The lump is standing in my garage as a spare if the LS2 breaks down... Per

[trackcar]

it made 338 on that run breathing in the warm air .. no cold air feed/plenum at that time. butterflies are 47/48mm .. we have several made up in different sizes.

[rev-erend]

trackcar said:

it made 338 on that run breathing in the warm air .. no cold air feed/plenum at that time. butterflies are 47/48mm .. we have several made up in different sizes.

I guess they are bigger than they look.

THe lower section of the inlet still is the restriction narrowing to around 38mm..

[rev-erend]

trackcar said:

it made 338 on that run breathing in the warm air .. no cold air feed/plenum at that time. butterflies are 47/48mm .. we have several made up in different sizes.

I guess they are bigger than they look.

THe lower section of the inlet still is the restriction narrowing to around 38mm..

[CrashTD]

rev-erend said:

THe lower section of the inlet still is the restriction narrowing to around 38mm..

is it not possible that the increasing velocity could actually allow equal if not greater volume of air to pass through?