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PostPosted: Sun Aug 04, 2019 2:58 pm 
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pelsby wrote:
I believe it has been explored by many and the general consensus is that the optimal port is .66 * the bore . I hope this helps and saves a few ports from becoming oversized .


What happens if the port becomes oversized???? Loss of power or too much power for non rpal status..... :D

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PostPosted: Sun Aug 04, 2019 3:31 pm 
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Loss of power . Nonpal Pal and Rpal have no size relations as there are many other parameters that determine these statuses . This is not the subject of this response or this thread .


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PostPosted: Sun Aug 04, 2019 3:42 pm 
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Okay...got it...less restrictive port equals less power...then I'll detune my guns further by using the poly tube instead ...to lower fps...thank you....

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PostPosted: Sun Aug 04, 2019 7:24 pm 
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Guaranteed loss of power by opening the bbl port on .177.
This incidentally is where the 66% of bore diameter comes into play, and not at the transfer port on a XX series gun.

I have yet to be velocity hungry enough to open a bbl port.

-D.S.

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PostPosted: Sun Aug 04, 2019 7:47 pm 
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Actually I was only kidding about the poly tube mod......tried it once with a 1377 and royally screwed up the barrel so I wont do THAT again...All I have in pumpers now is a recently acquired 2289 that I want to shoot closer to 500 so I figured the safest thing is to gradually drill out the port sleeve and keep checking with my chrony along the way..... The barrel has to stay at 14.6 inches although I like the looks of a longer barrel (18")with the stock piece attached... :D

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PostPosted: Sun Aug 04, 2019 9:46 pm 
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Someone is selling lots of Crosman parts, it's cheap to just buy the thing you need than DIY yours own one... At least save time?!

I don't want to work on my Crosman again... Otherwise, I would love to get a better 2300 tube to replace the stock one... His price of the parts is much better than elsewhere... And I am sure you can combine the shipping to save more as you need multiple parts...

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PostPosted: Mon Aug 05, 2019 6:20 am 
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YepYep wrote:
Someone is selling lots of Crosman parts, it's cheap to just buy the thing you need than DIY yours own one... At least save time?!

I don't want to work on my Crosman again... Otherwise, I would love to get a better 2300 tube to replace the stock one... His price of the parts is much better than elsewhere... And I am sure you can combine the shipping to save more as you need multiple parts...

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There is some satisfaction I guess from DIY and in the case of port sleeves I need to remove material bit by bit so I can gradually up the fps to where I want it....the only other way I know of to raise the fps gradually is by cutting down an 18 inch barrel inch by inch.... the sleeve is much easier to deal with.....and cheaper... :D

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PostPosted: Mon Aug 05, 2019 7:07 am 
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[emoji38] compare to the inch down the 18 inches barrel you are definitely right ~ cutting down the barrel you would need to take care of more jobs like crowning, polishing....

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PostPosted: Mon Aug 05, 2019 7:40 am 
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If you wish to incorporate the eighteen inch barrel why not just use a port restrictor ?


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PostPosted: Mon Aug 05, 2019 8:00 am 
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pelsby wrote:
If you wish to incorporate the eighteen inch barrel why not just use a port restrictor ?

I didnt realize there was such a thing as a port restrictor...and all the ideas Ive read on the subject of port sleeves involves enlarging them...not reducing them...interesting since I DO prefer the look of an 18 inch barrel......

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PostPosted: Mon Aug 05, 2019 12:46 pm 
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How would shortening the barrel increase the speed?

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PostPosted: Mon Aug 05, 2019 2:04 pm 
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Plate restrictor is a very thin washer with a tiny hole~ usually located beneath the port sleeve seal...

I have not seen one in a while. They are one of those small items like the safety detent ball that are easily, (and conveniently, depending on your mood) lost.

-D.S.

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PostPosted: Mon Aug 05, 2019 2:22 pm 
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Voltar1 wrote:
How would shortening the barrel increase the speed?
Hoho, [emoji38] I think OP means use an 18 inches barrel, but which will be too fast, so he need to cut it little and little, until he gets what he wants, ie, a 16-7/16 inch barrel gives him 498.5 fps muzzle velocity?!

Isn't that right , MyCrosman? =)


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PostPosted: Mon Aug 05, 2019 2:58 pm 
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Start with the 18 and factory tp size. See what you get and adjust tp size as required.

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PostPosted: Mon Aug 05, 2019 3:09 pm 
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YepYep wrote:
Voltar1 wrote:
How would shortening the barrel increase the speed?
Hoho, [emoji38] I think OP means use an 18 inches barrel, but which will be too fast, so he need to cut it little and little, until he gets what he wants, ie, a 16-7/16 inch barrel gives him 498.5 fps muzzle velocity?!

Isn't that right , MyCrosman? =)


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Thank you...yep..yep...thats exactly what I meant :D ....

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