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  #1  
Old 14th July 2006
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chrishajer chrishajer is offline
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Talking Coffee Cup Lid Mod for Higher Flow (pics) - The Hajer Mod

I can't work on the bike without coffee (well I can, but I dislike it.) However, I find a lot of inconsistency between vent holes in the most common coffee cup lids found in independent coffee shops. Shown here is a Sweetheart LGX12R lid. I have found the vent holes in these lids to range in size from .005" to .018" with a lot of plastic flash in some cases. The variation in vent hole size means inconsistent flow of coffee.




I often modify the vent hole so the restriction does not affect the flow of coffee. Please note: this modification is not EPA approved. Any tampering may void your warranty. Today I used an old razor blade, but you might be able to use a pen or screwdriver too.




I make a slice in the lid of approximately .040" on the 20 ounce cup. You may need a smaller slice for a smaller cup of coffee. I don't know since I always get the 20 ounce. Making the slice larger does not seem to increase flow any more than the .040" slice. YMMV.




This is a computer enhanced drawing of the slice, since it did not show up in the original photo. The slice does not separate the plastic of the lid that much, so it's hard to capture on film.

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  #2  
Old 14th July 2006
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How improved is the airflow at .040? Do you find it adequate?
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  #3  
Old 14th July 2006
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saltman241 saltman241 is offline
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Is there any danger of blow back through the inlarged intake?

Last edited by saltman241; 14th July 2006 at 08:06..
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Old 14th July 2006
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Quote:
Originally Posted by saltman241
Is there any danger of blow back through the inlarged intake?
I haven't gotten any reversion thus far.

--Chris
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Old 14th July 2006
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I usually run mine with the lid completely off. You have to becareful in the rain and the coffee does tend to run cooler faster but it optimizes flow if you don't mind a little dirt.
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Old 14th July 2006
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Post Sips/Time:

Seems to be the key issue.

The displacement rate, (being variable) obviously affects the clearance volume and it's effect on volumetric efficiency.

That being said, viscosity due to sugar, cream vs milk etc., MUST be fully considered.

My consultant (Juan Valdez) concurs and is standing by for further assistance as needed.

S/F
T.G.
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Old 14th July 2006
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Quote:
Originally Posted by ofnaman1995
How improved is the airflow at .040? Do you find it adequate?
There is quite a bit more intake noise, but the airflow is sufficient. I might try experimenting at .035" to get the noise down a bit.

--Chris
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Old 14th July 2006
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What *does* a coffee vent fart sound like?
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Old 14th July 2006
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this thread should be moved to paying taxes forum. i mean you did a rejet.
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  #10  
Old 14th July 2006
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Ok, the coffee is going in better........

What are you doing about getting it out???????
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