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Old 10-29-2003, 05:48 PM   #16
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Quote:
Originally posted by bbntc3
Was'nt speaking of your rods, nor was I necessarailly meaning Sirrio rods were reamed. Be it reamed or machined on a lathe for somereason they were off. Don't know how they produce mass pieces from the factory. So your saying the counter weight on the sittio crank is ok,? not wrong? I did dis assy. my engine before shipping for modding and noticed with out pision and rod on engine it would only spin 1 1/2 revs in block by hand. After getting it back, it turned 8 to 12 revs by hand. I had also checked brg alignment before modding. So balance is there somewhere right? I would think offset on crank wrong would also cause the rod failure I see here. ? I'm not hacking just trying to understand. I'm a diesel engine builder by trade and have been for over 25 years. I also have access to a few different sized Rockford Hardness testers. What #'s I'm I looking for if I was to check cranks for hardness. I'm sure all engine mani. let a few bad batches of cranks out, I'm sure theres a limit, to, what will go and what will blow.
I have check my posts three time and found nowhere any word I put about counterweight or bearings aligment, at list I didn't find them ( in my posts). Tell you more then that, when I was working on second Sirio, I found inside the separation compaund wasn't wash ou at all ( they use this compaund to form the ports during the casting and I have already worn everybody about this development in the past here in forum. I found more "corners" which needed to be "smoothed". I was talking about the conrod/cranck pin issue, because it is most abviose. If you want to talk about the rest of the stuff, it will be different story.
you are absolitly right about the tolerance in technology and production, but it is not realy good when we have tolerance in customer satisfaction. Even if it is one engine on 100, it might be yours or mine and we will be realy pissed off.
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Old 10-29-2003, 06:13 PM   #17
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Quote:
Originally posted by Suradaj
Heres my Sirio after a few runs.
Ahhh, I think i see your problem


is that a .2 shim, should have had .3

DC
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Old 10-29-2003, 06:24 PM   #18
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Quote:
Originally posted by OZDC
Ahhh, I think i see your problem


is that a .2 shim, should have had .3

DC
I dont think that is the issue! the stock 0.3mm is still on the head button, and the copper one usually is 0.1mm shim! so I think he has total of 0.4mm head shim in it!

Might be the front bearing not aligned properly!
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Old 10-29-2003, 06:49 PM   #19
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Quote:
Originally posted by Suradaj
Heres my Sirio after a few runs.
?!?!?! does this happen to .12s too? this is kinda scary for a newbie with a new .12 abc..
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Old 10-29-2003, 07:20 PM   #20
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Quote:
Originally posted by Motorman
just on the 21's

the 12's kick rods

I hope they get a grip.

All is good bro call sometime

I have to be polite as I'm about to become their competitor!

BB I read every day so if anyone needs me I will get to them sooner than later.
Thanks Motorman! I'll have to call ya man! I have mailed you a bunch with no reply. I'd rather talk. BB
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Old 10-29-2003, 07:28 PM   #21
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Quote:
Originally posted by Top Gun 777
I have check my posts three time and found nowhere any word I put about counterweight or bearings aligment, at list I didn't find them ( in my posts). Tell you more then that, when I was working on second Sirio, I found inside the separation compaund wasn't wash ou at all ( they use this compaund to form the ports during the casting and I have already worn everybody about this development in the past here in forum. I found more "corners" which needed to be "smoothed". I was talking about the conrod/cranck pin issue, because it is most abviose. If you want to talk about the rest of the stuff, it will be different story.
you are absolitly right about the tolerance in technology and production, but it is not realy good when we have tolerance in customer satisfaction. Even if it is one engine on 100, it might be yours or mine and we will be realy pissed off.
Sorry Top Gun! I said the brg alig. and counterweight issue not you. Keep up the research! We need people like you in the sport! And alittle more QUALITY CONTROL with engine companys, couldn't hurt either!!!
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Old 10-29-2003, 07:36 PM   #22
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Hmm, cranks to hard or too soft? can anybody give a hardness rating to look for? As if I could do something about it! LOL... I have seen sirrio cranks break down the middle of the outer clutch brg. area, on a SG shaft engine, leaving theouer end of the crank. Just like the material was too hard. Top Gun since you say the cranks were too soft, what hardnest scale are you using? Thanks!
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Old 10-29-2003, 08:39 PM   #23
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Quote:
Originally posted by OZDC
Ahhh, I think i see your problem


is that a .2 shim, should have had .3

DC
I see people mentioning shim sizes. What about talking head clearance instead of size of shims? I have a Collari Sirio with 1 copper shim (assuming .1mm) with .024" head clearance. I've heard you should have .024" - .028" so it's within the correct range. But that was referring to Nova based engines I think. Should it be different for Sirio?
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Old 10-29-2003, 09:49 PM   #24
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Sorry guys it was supposed to be a (obviously poor) joke.

Get it, engine blown to smitherines.
Needs extra .1 shimm
Ha ha, Get it, Get it.
ohhhhh bugger


DC


Quote:
Originally posted by OZDC
Ahhh, I think i see your problem


is that a .2 shim, should have had .3

DC
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Old 10-30-2003, 09:13 AM   #25
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Quote:
Originally posted by bbntc3
Hmm, cranks to hard or too soft? can anybody give a hardness rating to look for? As if I could do something about it! LOL... I have seen sirrio cranks break down the middle of the outer clutch brg. area, on a SG shaft engine, leaving theouer end of the crank. Just like the material was too hard. Top Gun since you say the cranks were too soft, what hardnest scale are you using? Thanks!
I am using Rockwell hardness scale. Sorry no numbers, but can assure you, all shafts has double hardness-inside softer them skin. I don't know how you call this process in english.
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Old 10-30-2003, 09:31 AM   #26
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Quote:
Originally posted by Top Gun 777
I don't know how you call this process in english.
Surface hardening?
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Old 10-30-2003, 09:52 AM   #27
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Quote:
Originally posted by InitialD
Surface hardening?
Yes surface hardening, but not just temperature hardening, there is some chemical process involve too.
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Last edited by Top Gun 777; 10-30-2003 at 05:36 PM.
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Old 10-30-2003, 04:57 PM   #28
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A friend of mine has the gold head .21 SIRIO's and it blew at the PARIS Race a couple weeks ago. He said the rod broke and it damaged the piston a little.

Another friend of mine has the .12, that blew up like mine did with the piston in many little pieces, haha.

After mine blew up, I was told to change the rod after break-in. A little to late for the info. Fast motor though~!
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Old 10-30-2003, 07:18 PM   #29
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Quote:
Originally posted by Suradaj
After mine blew up, I was told to change the rod after break-in. A little to late for the info. Fast motor though~!
I hear that for the .21 Sirios, you need to change the bearings too after one or two gallons of running... Don't know how true this is.

Is this common for Nova .21 engines?
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Old 10-30-2003, 07:28 PM   #30
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Quote:
Originally posted by Top Gun 777
Yes surface hardening, but not just temperature hardening, there is some chemical process involve too.
I don't know if this is used for the crankshafts but I know a process called salt bath nitriding where the material would be exposed to high concentrations of nitrogen under certain conditions to get the nitrogen to bond with the surface of the material.
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