[rm105]

What kind of dimensions do you need for the bushings/bearings? Lonex bearings have held up very well in my last few DSG builds, as it happened I had a spare set to measure:

 

[mr. potatohead]

Alas I don't have calipers, but those dimensions look promising. I am currently attempting to clean out my old bearings but am willing to take a gamble with the Lonex ones...

 

[mr. potatohead]

As promised, here's some pics:

 

[Guges Mk3]

I haven't seen a chipped sector like that since the early 2000's when people were installing SystemA M120 in TM mechboxes...

 

[mr. potatohead]

It might look like a sector from the angle, but it's a spur

 

[Guges Mk3]

Sorry...yes. Spur...brain fart.

 

[mr. potatohead]

Lonex bearings are out of stock in most major retailers but I'm considering the Laylax low profile ones...a bit expensive but should do its job.

 

[mr. potatohead]

Well guys here's what's new:
1. 5KU 8mm bearings don't work in a Dytac (bearings stick out too far and catch on the sides of the lower, selector plate won't fit over the bearings either; my gun is ambi so that doesn't help either.)
2. Prommy multi fit 8mm bearings seem good; I haven't had time to shim with them yet, but they have similar if not smaller measurements than the original stock bearings (I got metal dust in the stock ones cuz I'm dumb )

Everything's on pause for the next week and a half until I get through my exams...heck I might not be able to tech for the whole month cuz I'm so busy

 

[mr. potatohead]

Well well well, I got a bit of serendipity: A buddy canceled a fishing trip today so I was able to slap my gun back together after it sat disassembled for a month. I replaced the 18:1's with 16:1's, replaced the tappet with a better trimmed one, installed a new lonex cylinder head, installed my new prommy bearings, reshimmed, and regreased. No time to chrono, but it sounds pretty good...the chrono test will be the moment of truth.

 

[rm105]

I'm sure the fish feel the same way Which motor are you running in it now?

 

[mr. potatohead]

Still currently running the ASG 30k...I tried the ZCI HT, but had issues with the motor alignment. Yeah, I know the ASG isn't optimal, but it fits perfectly. I think I will try modifying the ZCI endbell or something to fit.

 

[Leo Greer]

Your chipped spur gear may have actually been a blessing. If your entire gearset was “upgraded” you may have torn apart more parts…

I had an air block issue that caused PME one time (forcing the piston to remain back longer than normal due to a jammed BB), and thankfully I had a single Lancer bevel gear among the SHS spur and sector.

Stupid me kept FAing the gun, and the motor ground every tooth off the bevel. Nothing else had any issues.

 

[mr. potatohead]

Well the DSG is all good - semi and full auto after the tappet trim redo; FYI don't mess with the front of the fin (where it contacts the sector cams). I've learned a lot since taking on this project. Thanks to everyone who's given me advice, especially [mention]rm105 [/mention], really couldn't have done it without all of the input. Build sounds around 50 RPS, ain't perfect in efficiency but I'll work on that down the road. I still ain't quite done yet though. Next step is to pick up a tienly and hack me a 12:1 DSG. I may consider stopping then This won't happen for at least another half year so I may start a new thread...road to 60+ RPS here I come!

 

[mr. potatohead]

Oh man, just when you thought a prob was solved...After swapping gearsets, problem re-emerges. Tbh, something else must be the culprit here - an uber short tappet shouldn't have tappet PME problems. Maybe I have PME??? 18g piston assembly @ 50+ rps, sp140. Seems improbable but not entirely out of the pic. I'll test with an sp150 I have. Hopup unit seems pretty snug, but issue test blows paper off even in semi. I just really wanna get this figured out so I can close this dumb thread and hopefully help someone else out. Any suggestions are welcome, pls bombard me with knowledge.

 

[Leo Greer]

What’s your tappet spring like? The only thing I can possible think of is that your spring isn’t strong enough or you have tappet/nozzle drag, causing the tappet to bounce along instead of fully returning.

Either that or you’re getting a small jam with your packing lips.

 

[Jimps]

SHS tappet plates can be too wide sometimes causing tappet PME in auto. I did not go through all 8 pages of this thread so not sure if someone said anything about this. This is a picture of the release point of the piston. The tappet pickup is pretty close to the tappet plate and there is not enough time for the piston to come home before it pulls back the tappet in full auto. I swapped in a guarder and it worked fine in auto at 48RPS. In fact the SHS tappet fin was so wide that the gears got hung up on the tappet. No clue how it did not snap it in half. Looks like you are using a SHS.

 

[mr. potatohead]

What’s your tappet spring like? The only thing I can possible think of is that your spring isn’t strong enough or you have tappet/nozzle drag, causing the tappet to bounce along instead of fully returning.

Either that or you’re getting a small jam with your packing lips.

Using a spring minus 2 coils + stock nozzle (extremely low resistance). Could be an issue with my hopup/bucking.

@Jimps Yep it's an SHS, tried just about everything. Sector cams don't seem as long as the siegetek's, though tappet PME could be possible still. I trimmed the SHS super short, which should negate tappet PME and only cause feed issues (which I haven't experienced). And yes, I've read and reread your thread.

I can't figure out where and/or what time in the cycle the air leak is occurring. I might order an assortment of guarder, lonex, and KA tappets and play around with 'em. Just seems like something else is off here...anyway thanks for the suggestions and pls keep 'em coming - doesn't matter how "stupid" or simple the advice may seem to you, I want it ALL cuz I'm gonna get to the bottom of this.

 

[Jimps]

This may not be an issue you have, but seems to be an appropriate place to share. Depending on the parts used, SHS tappet plates can be too wide for the sector to spin freely. The tappet pickup on the sector can get hung up on the tappet plate. Here is an SHS vs a random tappet plate. (These are just random parts from the bin) Using the SC sector had even worse hang up than this SHS sector.

 

[mr. potatohead]

Ok after much more scrutiny, I may have found something. I'm pretty sure at this point that the problem is due to the nozzle/packing/hopup. I got a look thru the feed tube at my packing in the hopup chamber. Are the packing lips supposed to protrude like this? It's a G&G green in the stock hopup. If not, what problems would this be causing? I don't know if it could be causing the fps inconsistency unless the packing lips are protruding so far that the nozzle scrunches them up, leaking air.

 

[savagemann]

Ok after much more scrutiny, I may have found something. I'm pretty sure at this point that the problem is due to the nozzle/packing/hopup. I got a look thru the feed tube at my packing in the hopup chamber. Are the packing lips supposed to protrude like this? It's a G&G green in the stock hopup.

View attachment 282375
View attachment 282376

Anytime I've had the lips protrude into the hop chamber like that, I have had feeding issues.
Shaving the lips down has fixed feeding issues every time for me.
I use a fiber cutting wheel on my dremel tool and carefully shave the lips down on the face of the wheel.
I guess it's possible the lips are getting pushed over by the nozzle?