Smooth flow valve stem - anyone try it?

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Smooth flow valve stem - anyone try it?

Postby RayK » Sat Jul 20, 2013 9:59 pm

Hi all.

I just fully rebuilt my marauder to install some new goodies from pete garden sniper and wondered if anyone had an improved valve stem and poppet.

I noticed a2a has one.

Anyone try it?

What were your results?

Or maybe just clean up the stock one a bit. The plastic casting is a bit rough.

Thanks

Ray
25 M-rod, 25 M-rod @ Citrus Airguns bullpup, 22 Citrus ReBuilt M-rod, 177 M-rod, new 22 P-rod
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Re: Smooth flow valve stem - anyone try it?

Postby RayK » Mon Jul 22, 2013 7:46 pm

How about, has anyone modified their own valve stem/poppet?

Or has anyone cleaned up the stock one just a bit?

Do you notice any improvements?

Ray
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Re: Smooth flow valve stem - anyone try it?

Postby Motorhead » Mon Jul 22, 2013 10:42 pm

Ground down the stock poppet stem within throat to @ .095" on the .22 and use a ATA reduced diameter poppet on the .177 ;)
Given the choice and cost would use the ATA poppet if servicing :D

Tho must say ... DO NOT like the ADA set up of using no poppet spring. Actually have found efficiency INCREASES with a poppet spring heavier than stock :o when using factory hammer. Go regulated and it ALL changes in ideal configuration ;)
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Re: Smooth flow valve stem - anyone try it?

Postby RayK » Tue Jul 23, 2013 11:44 am

Motorhead wrote:Given the choice and cost would use the ATA poppet if servicing :D


Thanks Scott!

Is the ATA poppet compatible with the stock 22 valve? Any advantage to upgrading the poppet/stem if I am not running more than modest power tunes?

Also, where does the poppet seal? I can't see inside the valve well enough to tell. Is it at the flat face where the valve stem comes out (this is my guess but my stock poppet did not look that clean/flat on this surface)? Here is an image of a "hopped up" one for 25 M-rod. I can see where they turned down the stem diameter near the poppet to improve air flow.

Ray
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Re: Smooth flow valve stem - anyone try it?

Postby Motorhead » Tue Jul 23, 2013 12:37 pm

Typical top hat design poppet.

Poppet seals the throat around the O.D. margin.
In a modest tune using the ADA poppet may show a tad power increase, but without other "Flow" mods to valves plumbing it won't be anything dramatic imo
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Re: Smooth flow valve stem - anyone try it?

Postby RayK » Tue Jul 23, 2013 5:51 pm

Is the poppet slightly tapered (e.g., funnel or cork shaped) so that it fits into the throat to seal?

Garden Sniper Pete provided me with a valve cap and gauge block that have been funneled to improve flow, but the output side (to the transport) is unchanged.

That stock poppet does not even look precision enough to seal the valve properly. I'm pretty amazed that they work so well. It looks like a kid's toy stamped out of plastic.

As you know, I'm mostly looking for balance, so I was just wondering if there is an advantage for me given that I am not shooting for peak output power.

I really do value longish shot strings with small ES with reasonable squirrel killing power. These are my current Marauders

22 Prod 24 shots at 16 FPE - 25 ES.
22 Mrod 50 shots at 22 FPE - 24 ES.
25 Mrod 16 shots at 42 FPE - 19 ES.

Ray
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Re: Smooth flow valve stem - anyone try it?

Postby Motorhead » Tue Jul 23, 2013 9:48 pm

No cork taper .... brim of the hat sits on edge of the hole just overlapping by an @ 1/16 - 3/32 seat width.
Seat and poppet rely on being square and true so the seal margin is in uniform contact.
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Re: Smooth flow valve stem - anyone try it?

Postby joshncarol » Wed Jul 24, 2013 12:12 am

Ray,
I hope this helps. :ugeek:

R/

Josh

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Re: Smooth flow valve stem - anyone try it?

Postby RayK » Wed Jul 24, 2013 11:51 am

Yes thanks guys, so the important surface is where metal stem goes into plastic poppet?

It also looks like care has been taken to allow flow behind poppet to flow towards stem base.

Is A2A smooth flow a high flow poppet that can be used with stock valve and spring? If so, maybe I should try one with Garden Sniper Pete's improved valve cap.

Ray
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Re: Smooth flow valve stem - anyone try it?

Postby Motorhead » Wed Jul 24, 2013 12:02 pm

RayK wrote:Yes thanks guys, so the important surface is where metal stem goes into plastic poppet?

It also looks like care has been taken to allow flow behind poppet to flow towards stem base.

Is A2A smooth flow a high flow poppet that can be used with stock valve and spring? If so, maybe I should try one with Garden Sniper Pete's improved valve cap.

Ray


Yup the reduced diameter stem ADDS area and volume to the throat area behind the seat increasing flow potential.
Regulated Custom M-rods - Pupped .22 / Thumbhole .177 / .20 Conversion
Air Arms TX-200 MkIII .177
FWB 124D .177
Diana 75 HV TO-1 Match .177
Barnett Spitfire .177
Regulated BAM-51 .177
Crosman PC77 & SSP-250 .177
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