My Success and Failure of IHP Tuning--Part 1 (LONG)

[pkjeetesh]

Thirtha ....this is good..im glad you replied...please look at the picture below and suggest...if I have to file the rear of the sear...what is an acceptable limit ...im worried that if I overdo it then the piston will not release...im also planning to solder brass bushes on the piston bearings in order to reduce play and friction...

[pkjeetesh]

sorry bt that here is the picture

[TenX]

Excellent dissection Thirths

[tirths]

Jeetesh: If you make deeper groove, will the trigger hold more strongly? think..think..think...

For bearing, in case of metal to metal, both of them should be very hard metal in order to have less friction. So brass is no no. Secondly, there is only 1/3~1/4mm gap availabel between piston and tube.

TenX: Thanks!

[pkjeetesh]

yeah...you could be right with the picture you have...after ensuring that the piston retaining washer, end bearing and spring guide face washer are aligned on the same axis and perpendicular to the sear...spring tension needs to be checked too...yet the solution could be simpler than the above..I'll wait for your advice...I sorted out the G350 trigger problem by using a round file to cut a deeper groove...it worked...for how long ...that remains to be seen...

[pkjeetesh]

also...the bottom flat portion of the piston rod in line with the centre of the trigger pin...that is very difficult without a side cut out....

[pkjeetesh]

Hey Thirths...do you think the above answers are okay....I'll start the work after you confirm...

[tirths]

Hey Thirths...do you think the above answers are okay....I'll start the work after you confirm...

You are not right so am I. With the existing trigger blade, I cannot do much and THATS MY FAILURE.
Two possibilities I can think of now:

1. The metal on sheers should be very high quality to hold it better with the existing scenario.
2. Trigger holder pin go 1~2 mm down to have a proper mechanical support to hold the sheer.

-Tirtha

[pkjeetesh]

point 2 seems okay...do not stop with this...please continue the series.....

[tirths]

point 2 seems okay...do not stop with this...please continue the series.....

I don't understand why IHP did not do it. Or may be they have done it but perhaps what I am showing it here is having a quality flaw??

Any light from anyone?

[Biren]

Hi Tirtha,

I had put the spring you gave me on my IHP. It was short in length to the IHP one. Installation was tough and needed three persons. Performance has improved slightly in terms of penetration. Cocking needs sligtly more effort. Would like to know how was others experience. PM not going buddy

Cheers,
Biren

[pkjeetesh]

Biren
The Maccari E3650 tarantula spring is shorter than the IHP spring by almost 10 coils but is believed to be more powerful (?)...you will need several spacers near the piston head to make up for the length ...yet, please wait for the experts to speak up..meanwhile here is a picture of the two springs side by side...the one on top is an original IHP factory spring and the other one below is JM's....

[Biren]

Thanks Jeetesh,

Let me elaborate my experience. Performance has improved, though the spring is shorter then IHP. I didnt lubed the spring as it was steel. Will that make difference? Second once cocking it went limp, this happened out off 100 odd shots i fired. Just once. Spacers? can you explain that.. where to get and how to place then... a novice u c.. Secondly i donnt have the advantage of a chrono to measure the speed of pellets so did rudimentary experiment by checking the pellet conditions after shooting before and after instalation. My overall experience is yes the penetration power goes up. I tried both gamo promagnum and g smith pointed. Gamo pellets are far better and my expereience say GAMO suits IHP .22. GURUS well waiting for their comments as wat they have to say. Tirtha is a sweet guy and yes i find Manish and your enutho... now i donnt have scale to measure:)... ha ha ha

Take care
Biren

[pkjeetesh]

Biren..take the final word from Thirtha or Mack The Knife/Karizman..heres what I know....in all my experience with IHP springers..only the IHP factory spring which is longer and milder works best..TASCO/CHEROKEE and Gsmith work too..but they are shorter and Im not satisfied with the performance...I know of at least one member in this forum who had experimented with a Maccari spring on his IHP and his gun was in bits in no time...I think it was Dev..a light coating of grease on the spring will help..it could dampen the vibration...spacers could be in the form of plain flat washers of the right size....the extra weight of the piston could be compensated with the extra power of the spring...also the spring should be snug fit on the spring guide at the rear...the gun would otherwise rattle to no end...

Regards

P K Jeetesh

[tirths]

Biren,

Using a spring compressor is always a good idea. What you have done by compressing the spring by 3 people is technically called "setting solid". when you put a load on a compression spring, it'll want to spring back to its free length. If you hold it unevenly, it might fly out sideways which is bad for the spring and can be canted. JM's springs are over stressed for some reason. During the solid setting, might shorten your spring up a little bit depends on how much overstressed it is. I hv seen, JM spring shorting up by 2.5" and it is globally acceptable and popular among American gun tuners.

Regarding spacer, there are theories on spring compression. That is another subject, I don't know if Janta is ready for that. but one thing for sure, if you add spacer you can make use of spring's full capacity but that does not mean velocity enhancement of your gun.

And spacer on Piston, well another theory on force ; but if you increase the weight without knowing the theory, hmm for sure you will get a good amount of recoil

-Tirtha