Canadian Airgun Forum

The #1 Community for Airguns in Canada!
It is currently Wed Nov 20, 2019 12:17 pm

All times are UTC - 5 hours


The Canadian Airgun Forums are a place for people to discuss and learn about airguns and the airgunning sport in Canada. There are lots of discussions about airguns, airgun accessories, reviews, modification and repair information, airgun events, field target and free classifieds!

 

You need to register before you can post: click the register link to proceed. Before you register, please read the forum rules. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own pictures, and access many other special features. Registration is fast, simple, and absolutely free! To start viewing messages, select the forum that you want to visit from the selection below.








Post new topic Reply to topic  [ 9 posts ] 
Author Message
 Post subject: Boring and polishing
PostPosted: Mon Oct 21, 2013 7:11 am 
Offline

Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
I have seen vids on modders polishing transfer ports to increase efficiency, but has anyone experimented with boring out the ports on both the barrel and valve to increase velocity? I just want to know if there are any related pitfalls that I haven't considered.

_________________
The flaw with experience is, it causes us to forget what we were like when we didn't have any.


Top
 Profile  
 
 Post subject: Re: Boring and polishing
PostPosted: Tue Oct 22, 2013 7:24 am 
Offline

Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
No replies? Am I to assume that no-one has attempted this?

_________________
The flaw with experience is, it causes us to forget what we were like when we didn't have any.


Top
 Profile  
 
 Post subject: Re: Boring and polishing
PostPosted: Tue Oct 22, 2013 8:00 am 
Offline
User avatar

Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
Handyguy wrote:
No replies? Am I to assume that no-one has attempted this?

I don't know about boring out the TP,s but do know that replacing the TP on a 2240 with a larger one significantly increases power when a heavier valve spring is used. Even with a stock spring, power is increased.

_________________
If I had only one wish, it would be to be able to "unsay" things.


Top
 Profile  
 
 Post subject: Re: Boring and polishing
PostPosted: Tue Oct 22, 2013 9:08 am 
Offline

Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
joe hickey wrote:
Handyguy wrote:
No replies? Am I to assume that no-one has attempted this?

I don't know about boring out the TP,s but do know that replacing the TP on a 2240 with a larger one significantly increases power when a heavier valve spring is used. Even with a stock spring, power is increased.


On the 2079 there is no steel TP like on the 2240, there is only a seal that connects them. What I speak of is, boring the output port on the valve and the input port on the barrel then polishing each. I have yet to read anywhere that this has been done and perhaps there is a reason for this.

_________________
The flaw with experience is, it causes us to forget what we were like when we didn't have any.


Top
 Profile  
 
 Post subject: Re: Boring and polishing
PostPosted: Tue Oct 22, 2013 1:05 pm 
Offline
User avatar

Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
I'm not familiar with that gun, but if there is a hammer spring, that would be my first mod to gain power.Afterward,s if that work,s then a larger TP might also add a few more fps.

_________________
If I had only one wish, it would be to be able to "unsay" things.


Top
 Profile  
 
 Post subject: Re: Boring and polishing
PostPosted: Tue Oct 22, 2013 9:01 pm 
Offline
User avatar

Joined: Sun Jul 15, 2012 10:49 am
Posts: 6029
Location: Victoria, BC and Clarkston, WA
If your talking on the 2240, YES. rsterne has done lots of exhaustive research on port sizes on transfer ports.

You'll just need to look back in CAF forum. Depends if you want more power or more shots.

_________________
-Rick
Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


Top
 Profile  
 
 Post subject: Re: Boring and polishing
PostPosted: Tue Oct 22, 2013 10:24 pm 
Offline

Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
rrdstarr wrote:
If your talking on the 2240, YES. rsterne has done lots of exhaustive research on port sizes on transfer ports.

You'll just need to look back in CAF forum. Depends if you want more power or more shots.


Since I am now in possession of a 80 cu/ft scuba tank, I'm going all for power.

_________________
The flaw with experience is, it causes us to forget what we were like when we didn't have any.


Top
 Profile  
 
 Post subject: Re: Boring and polishing
PostPosted: Thu Oct 24, 2013 8:09 pm 
Offline
User avatar

Joined: Tue Jun 03, 2008 5:46 pm
Posts: 2815
Location: Canada
If going to air as a power source...leave the port sizes alone unless going big bore...co2 ports are usually too big for air/n2 hurting efficiency.

Al


Top
 Profile  
 
 Post subject: Re: Boring and polishing
PostPosted: Thu Oct 24, 2013 8:16 pm 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8978
Location: Coalmont BC
This thread should answer your questions.... topic56312.html

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group

phpBB SEO