Does this look ok ? Need some thoughts pls
#3
most likely too lean as you're using 16% nitro already (unless <0.2mm shims). how much shims you got for the engine?
#6
this is one thing thats frustrating in this hobby ... everything you learn is the hard way ... every person says something different and I usually find the right solution by damaging something.
I searched these forums and found many posts saying that the 12TZ should have only 0.2mm shim if running 16% nitro and once it has been run in. Now , I am told to add more shims ? sorry, but its really confusing
Also, with regards to the oil, I could not find anything specific on the manufacturer website and the guys at local hobby shop recommended to run 5% and 5% ... yet I am told something different again.
I appreciate all the feedback and help from you guys ... but its just frustrating because I want to do the right thing, however, I get so many different opinions that its confusing
I searched these forums and found many posts saying that the 12TZ should have only 0.2mm shim if running 16% nitro and once it has been run in. Now , I am told to add more shims ? sorry, but its really confusing
Also, with regards to the oil, I could not find anything specific on the manufacturer website and the guys at local hobby shop recommended to run 5% and 5% ... yet I am told something different again.
I appreciate all the feedback and help from you guys ... but its just frustrating because I want to do the right thing, however, I get so many different opinions that its confusing
#7
this is one thing thats frustrating in this hobby ... everything you learn is the hard way ... every person says something different and I usually find the right solution by damaging something.
I searched these forums and found many posts saying that the 12TZ should have only 0.2mm shim if running 16% nitro and once it has been run in. Now , I am told to add more shims ? sorry, but its really confusing
Also, with regards to the oil, I could not find anything specific on the manufacturer website and the guys at local hobby shop recommended to run 5% and 5% ... yet I am told something different again.
I appreciate all the feedback and help from you guys ... but its just frustrating because I want to do the right thing, however, I get so many different opinions that its confusing
I searched these forums and found many posts saying that the 12TZ should have only 0.2mm shim if running 16% nitro and once it has been run in. Now , I am told to add more shims ? sorry, but its really confusing
Also, with regards to the oil, I could not find anything specific on the manufacturer website and the guys at local hobby shop recommended to run 5% and 5% ... yet I am told something different again.
I appreciate all the feedback and help from you guys ... but its just frustrating because I want to do the right thing, however, I get so many different opinions that its confusing
tz12 may have a default of 0.1mm head clearance, thus with 0.2mm shims the actual head clearance of 0.3mm is ok for 16%.
however the oil in the nitro is recommanded to be 8% minimum.
#8
this is one thing thats frustrating in this hobby ... everything you learn is the hard way ... every person says something different and I usually find the right solution by damaging something.
I searched these forums and found many posts saying that the 12TZ should have only 0.2mm shim if running 16% nitro and once it has been run in. Now , I am told to add more shims ? sorry, but its really confusing
Also, with regards to the oil, I could not find anything specific on the manufacturer website and the guys at local hobby shop recommended to run 5% and 5% ... yet I am told something different again.
I appreciate all the feedback and help from you guys ... but its just frustrating because I want to do the right thing, however, I get so many different opinions that its confusing
I searched these forums and found many posts saying that the 12TZ should have only 0.2mm shim if running 16% nitro and once it has been run in. Now , I am told to add more shims ? sorry, but its really confusing
Also, with regards to the oil, I could not find anything specific on the manufacturer website and the guys at local hobby shop recommended to run 5% and 5% ... yet I am told something different again.
I appreciate all the feedback and help from you guys ... but its just frustrating because I want to do the right thing, however, I get so many different opinions that its confusing
#9
You may have dropped part of a plug element when running too lean.
Do you remember blowing a plug recently? If you did was the element intact or was it missing.
I would recommend pulling the piston out and checking the sides for any scratches.
If there is you may be up for a new Piston/Liner.
If not then the best course of action would be to polish up the top of the piston and the button.
Depending on the amount of pitting you can try autosol or if it is pretty bad then use a really fine wet and dry sandpaper first before polising with the Autsol.
Do you have another engine to run this sunday? If you do put that in and I will have a look at this one for you on sunday.
#11
u have pitted your button head and maybe piston head the good news is your engine didnt break any parts. easily done like what brag mention, get 1200 grid sand paper and smooth button head gently and polish top part of your piston. if the compression is still there, maybe need to remove 0.1mm shims.
what i've seen locally OS engines are really weak against lean bottom end settings. mostly end up breaking con rod and in 4 out of 5 cases its total loss. and get your conrod replaced.
just my humble opinion
what i've seen locally OS engines are really weak against lean bottom end settings. mostly end up breaking con rod and in 4 out of 5 cases its total loss. and get your conrod replaced.
just my humble opinion
#12
Alex,
You may have dropped part of a plug element when running too lean.
Do you remember blowing a plug recently? If you did was the element intact or was it missing.
I would recommend pulling the piston out and checking the sides for any scratches.
If there is you may be up for a new Piston/Liner.
If not then the best course of action would be to polish up the top of the piston and the button.
Depending on the amount of pitting you can try autosol or if it is pretty bad then use a really fine wet and dry sandpaper first before polising with the Autsol.
Do you have another engine to run this sunday? If you do put that in and I will have a look at this one for you on sunday.
You may have dropped part of a plug element when running too lean.
Do you remember blowing a plug recently? If you did was the element intact or was it missing.
I would recommend pulling the piston out and checking the sides for any scratches.
If there is you may be up for a new Piston/Liner.
If not then the best course of action would be to polish up the top of the piston and the button.
Depending on the amount of pitting you can try autosol or if it is pretty bad then use a really fine wet and dry sandpaper first before polising with the Autsol.
Do you have another engine to run this sunday? If you do put that in and I will have a look at this one for you on sunday.
hmmm ... I cant recall blowing a plug ... I did have a look on the liner and it seemed clean, but then again, I am no expert.
I'll try to give it a polish tonight ... is Brasso ok to use or do I have to use Autosol only ? I have a can of Brasso and plenty of super fine grit sandpaper that I used on my waterblocks and when I lapped my CPU.
if I get stuck, I'll just use the little Nova I have for the Sunday race and bring the 12TZ for you to have a look when you have a sec.
#14
Tech Master
iTrader: (21)
Alex
from my experience of OS spec II(3 of them), once you have pited the head and piston top even though you polish it will still blown plug and have irregular idling. But your one doesnt look too bad.
Head shims wise .2mm is fine for us with 16% and you should you use 7 plug. make sure you leave bottom end needle flush with the housing TZ dont like bottom end lean at all(leave it alone) depends on what pipe you are using top end needle is about 1.75-2 turns out from fully close.
1 last thing you are using Magnesium head so it take much longer time to warm up, so dont touch any needle until engine has some temp in it.
come and see me on Sunday I will try tune it for you. btw make sure clutch is set probably!
Tom