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Gavin Wakely

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Milton Keynes

A friend has a kit car with a tweeked turbo set up, he's looking into managment and injection (single throttle body). Now is it still necessary to fit a plenum, or is this obsolute once you go to an injection throttle body.

http://i28.photobucket.com/albums/c248/spe...er1/mini007.jpg

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Carlzilla

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Quarry Bonk

Not needed for injection as the fuel is always under pump pressure and not float bowl fed

On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper

On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!!

17.213 @ 71mph, 64bhp n/a (Old Engine)


Pauly

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Wolverhampton, West Midlands

.

Edited by Pauly on 7th Feb, 2014.


mini93

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Warwick.

sure about that? theres many a car out there which uses a plenum as well as injection. The plenum acts more like an air reserviour to hold the air before its drawn into the cylinder. There is a rule of thumb the Plenum should be roughly 1.5X the capacity of 1 cylinder, so your drawing from this rather than waiting for your turbo to supply the neccesary air. It also dampens out any pulses in the air caused by the turbo


On 7th Feb, 2014 Carlzilla said:
Not needed for injection as the fuel is always under pump pressure and not float bowl fed

David.


Brett

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Doncaster, South Yorkshire



On 7th Feb, 2014 mini93 said:
sure about that? theres many a car out there which uses a plenum as well as injection. The plenum acts more like an air reserviour to hold the air before its drawn into the cylinder. There is a rule of thumb the Plenum should be roughly 1.5X the capacity of 1 cylinder, so your drawing from this rather than waiting for your turbo to supply the neccesary air. It also dampens out any pulses in the air caused by the turbo


On 7th Feb, 2014 Carlzilla said:
Not needed for injection as the fuel is always under pump pressure and not float bowl fed


mini 93 is correct, however the mini plenum is literally just a restriction in air flow to ensure the fpr gets a slightly higher pressure signal than what is available to the carb

if throttle body injection ( such as the specialist components kit ) is used the metro plenum is not needed
a better designed inlet with correctly sized plenum would be beneficial no doubt

Edited by Brett on 8th Feb, 2014.

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Carlzilla

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Quarry Bonk

I think he was on about the metro plenum, which is why i replied no to avoid confusion *tongue*

On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper

On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!!

17.213 @ 71mph, 64bhp n/a (Old Engine)

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