Hi all. First post here. I picked up a aea hp carbine in 25 cal afew months ago and running it through my chronograph. From the factory it was shooting about 900 fps. Since shimming the hammer spring and cleaning up the burrs on the barrel ports its now close to the advertised 950 fps. I'm getting about 935 with the 25gr jsp. Has anyone ported the 6 holes on the barrel over the size to see a power increase. I took a .098 drill bit to the holes just to clean up the burrs but was curious about going bigger for better air flow to the pellet.
Tuning Aea hp carbine barrel porting question
- Thread starter Dadonman
- Start date
I ported my AEA 457 there and gained a good percentage of speed. I used a conical shaped Dremel bit so the ports were Venturi shaped and sped air through them (like a carburetor does).
I have ported everything I own except the AAA Slayer, which comes ported. The key to porting is to pay attention to the air's path and make it flow smoothly and with velocity. Just hogging out the ports can be detrimental because it could actually slow down the airflow. Look at videos on how to port automotive racing heads on YouTube for airflow pointers and tricks of the trade.
Upvote 0
Ok great thanks. Definitely don't want to loose power. Just out of curiosity, After your porting how much velocity increase did you see on average for your rifles?
Upvote 0
I usually gain around 50 fps from just port matching all the parts and radiusing the corners so the air flows smoothly around the corners. Search this forum for my old pics of the gen 1 Impact and Benjamin SAM port jobs that I did, and you'll get an idea of what needs worked on to make things flow better.
With the design of the AEA 457 Challenger barrel 6 hole transfer porting, the only thing that could realistically be done there was to Venturi the ports and smooth the initial intake of air into the ports. Your ports may be different. I've seen where the new ports are oblong on some of their models and barrels now. If that is how your model is then it may be as big as it can get for air volume, but direction and velocity can be altered possibly (by angling/radiusing the ports at the corner transitions). Post us up some pictures of what you do and the gains.
Upvote 0