1720t with P-Rod TP .080

Started by d_ray50, September 26, 2017, 04:56:59 PM

0 Members and 1 Guest are viewing this topic.

d_ray50

Does anyone know what kind of fps i could expect out of a 1720t by just changing to a .080 TP and using the stroke adjustment and hammer spring adjustment? I would like to get up around 800 fps 12fpe with JSB 8.4gr pellets . Or will i have to go with a bigger TP ?

RetatCDude

#1
I have the same setup in my 1720T.
I have added a 4 o-ring BHB and a bit stronger hammer spring.
Here are the numbers with 7.33 JSB:
Crosman 2300s
Crosman 2240XL

arkmaker †

I Am A Natural Mad Air Gunner  -  Full Of Hot Air & Ready To Expel It Quickly!

114 Rifle, 2240XL Pistol, 1861 Shiloh Pistol, 357 Pistols, Titan GP Rifle, PM66 Rifle, 2400KT .177 LW Carbine, CZ T200 Rifle, Benjamin Discovery .177 Rifle, Hammerli 850 Air Magnum in .22

nervoustrigger

You may be able to get it up to 12fpe but it won't be very efficient.   A generous transfer port and a short valve dwell will make better use of air. 

I drilled out a transfer port to 0.094" and used a bstaley O-ring buffer to tune a 1720T for my friend.  Ended up with a very nice 34-shot string inside of a 4% ES, peaking right at 12fpe (11.4fpe average).

https://www.gatewaytoairguns.org/GTA/index.php?topic=86564.msg832336#msg832336

d_ray50

 Thanks for the information i have book marked it for future use.