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Flow rates, info, data for YB heads?

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Old 12-01-2009, 12:07 PM
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Default Flow rates, info, data for YB heads?
Has anybody got any flow data on stock and modified YB heads??
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Old 12-01-2009, 12:10 PM
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yes thanks roflol
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Old 12-01-2009, 12:13 PM
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Spread the love.. i mean knowledge then Tony.
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Old 12-01-2009, 12:17 PM
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no lol
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Old 12-01-2009, 12:19 PM
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Why not. I just want flow data. Not how to achieve that flow. Can' t see it really giving away any secrets.
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Old 12-01-2009, 12:33 PM
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Tony had to invest money/time into getting the data, so fair play if he wants to keep it to himself!
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Old 12-01-2009, 12:48 PM
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Do you have a flow bench Tony?
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Old 12-01-2009, 12:49 PM
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Anybody else? Can't belive nobody has ever asked for the flow data for the ported head they are buying????
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Old 12-01-2009, 12:59 PM
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Originally Posted by Garage19
Anybody else? Can't belive nobody has ever asked for the flow data for the ported head they are buying????
I tried LOL

https://passionford.com/forum/general-car-related-discussion/264587-cylinder-heads-surge-turbos-etc.html

https://passionford.com/forum/general-car-related-discussion/266598-head-experts-and-engine-speccing.html

Busy threads
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Old 12-01-2009, 01:14 PM
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Can't belive people haven't asked to see flow data, if not from their actual head then the development head.

Its not giving any secrets away. Its like asking for dyno results showing bhp. It doesn't tell you specifics about how it was tuned
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Old 12-01-2009, 01:17 PM
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Ring him and ask on his premium rate number.
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Old 12-01-2009, 01:18 PM
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I could maybe find out the flow rate of a standard one for you. Not making any promises though!!!
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Old 12-01-2009, 01:20 PM
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Doug, I have many maps for differing engines and states of tune.

If you know the boost pressure, fuel pressure, target AFR and injector types, I can tell you what the injector duration is for any load/rpm and you can work out the air flow from that !

LOL... headache !!!
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Old 12-01-2009, 01:25 PM
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Originally Posted by L8 ECU
Doug, I have many maps for differing engines and states of tune.

If you know the boost pressure, fuel pressure, target AFR and injector types, I can tell you what the injector duration is for any load/rpm and you can work out the air flow from that !

LOL... headache !!!
Wouldn't you also need the BSFC?
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Old 12-01-2009, 01:26 PM
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Originally Posted by Paul_RS
I could maybe find out the flow rate of a standard one for you. Not making any promises though!!!
That would be good. Thanks.
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Old 12-01-2009, 01:35 PM
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Found some data. The CNC heads site states they measured a stock head at 122cfm @ 10" WC.

Their big valve ported head flows 191.5 @10".

Only problem is under the chart the small print states the flow rates were done at 0.5" (12.7mm) valve lift.
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Old 12-01-2009, 01:38 PM
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Originally Posted by Garage19
Wouldn't you also need the BSFC?
I think thats fairly constant on pump fuels (chip will correct me if I am wrong LOL)
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Old 12-01-2009, 03:32 PM
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Do any of the tuners on of have a flow bench?
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Old 12-01-2009, 04:01 PM
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doug check www.cncheads.co.uk

im sure they give some flow info on a std and ported yb head on the yb products page. it may be of some use ..


edit, just seen youve done that lol
Last edited by JTECH James; 12-01-2009 at 04:39 PM.
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Old 12-01-2009, 04:34 PM
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If you give a fig then you have a target to aim for.

Mark
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Old 12-01-2009, 05:17 PM
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Originally Posted by Mark Shead
If you give a fig then you have a target to aim for.

Mark
True, but I'd still have to do my own development to get there.

I'm not actually interested in porting yb heads I just need some flow figures for 4 valve 4 pot performance heads for another project.
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Old 12-01-2009, 06:43 PM
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Originally Posted by Garage19
True, but I'd still have to do my own development to get there.

I'm not actually interested in porting yb heads I just need some flow figures for 4 valve 4 pot performance heads for another project.
I have never botherd looking at what others do as you would need to check yourself to see if it was right.

Mark
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