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ITB flow bench

 
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TwinTurboM3



Joined: 21 Mar 2008
Posts: 535

PostPosted: Sun Nov 30, 2014 2:09 pm    Post subject: ITB flow bench Reply with quote

found a flow test on a forum where the cylinder head flow figures dropped when used with Individual Throttle Bodies.

Whats the reason?
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kamuto



Joined: 08 Dec 2013
Posts: 21

PostPosted: Sun Nov 30, 2014 2:17 pm    Post subject: Re: ITB flow bench Reply with quote

TwinTurboM3 wrote:
found a flow test on a forum where the cylinder head flow figures dropped when used with Individual Throttle Bodies.

Whats the reason?

diameter?
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TwinTurboM3



Joined: 21 Mar 2008
Posts: 535

PostPosted: Sun Nov 30, 2014 2:49 pm    Post subject: Reply with quote

50 or 51 mm.
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David Ferguson



Joined: 21 Aug 2006
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Location: Paso Robles, CA

PostPosted: Sun Nov 30, 2014 3:14 pm    Post subject: Reply with quote

Perhaps having the throttle plate included in the flow path made a difference. Or as Kamuto has suggested perhaps the diameter of the ITB is smaller than the original test (say done with a bare head?)
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TwinTurboM3



Joined: 21 Mar 2008
Posts: 535

PostPosted: Sun Nov 30, 2014 3:31 pm    Post subject: Reply with quote

David Ferguson wrote:
Perhaps having the throttle plate included in the flow path made a difference. Or as Kamuto has suggested perhaps the diameter of the ITB is smaller than the original test (say done with a bare head?)


David,
I dont know.

its from a forum, so have no idea.
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joe90



Joined: 19 Mar 2013
Posts: 382
Location: under the car

PostPosted: Sun Nov 30, 2014 10:18 pm    Post subject: Reply with quote

Flow benches work at constant flow and 1PSI of pressure.

Engines don't.

If you're going to flow test a bare head then flow test it again with ITBs attached........of course the figures will drop......there's something wrong if they don't.
So .......they're like dynos.
They're a tool which has both it's uses and it's limitations.
Don't take them too seriously.
Like forums.
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E30IS



Joined: 26 Jun 2008
Posts: 105

PostPosted: Fri Jan 09, 2015 1:17 am    Post subject: Reply with quote

usually the TB even including the shaft CSA will be bigger than the mincsa of the cylinder head if you have used taper in the design of the induction system.

if you are seeing decent flow losses i presume the manifold bolted to the head doesn't transition well or doesn't align with the port angle so the flow is being biased to a certain part of the port/valve creating some "deader" areas and general turbulence deue to misalignment. there will of course be some losses these are not unusual.

try flow test the manifold and TB alone perhaps this will reveal where the issue may lie if there an one?
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stevieturbo



Joined: 29 Aug 2006
Posts: 1235
Location: Norn Iron

PostPosted: Sat Jan 10, 2015 6:32 am    Post subject: Re: ITB flow bench Reply with quote

TwinTurboM3 wrote:
found a flow test on a forum where the cylinder head flow figures dropped when used with Individual Throttle Bodies.

Whats the reason?


Dropped compared to what though ?

There are many many variables.
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