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Old 04-07-2004, 12:27 AM   #1
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Default Sirio 12 engine conrod question

Hello,

I disassembled my Sirio 12 engine to replace piston/liner. However, I forget to note down the orientation of the conrod. I notice that the conrod, on the end that is to go to the crankshaft, have one side with a small oil hole with a long groove, and another side with just a short groove and no hole. Should the "hole side" face the conrod, or it should face the backplate?
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Old 04-07-2004, 01:25 AM   #2
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Default Re: Sirio 12 engine conrod question

Quote:
Originally posted by jasoncsc
Hello,

I disassembled my Sirio 12 engine to replace piston/liner. However, I forget to note down the orientation of the conrod. I notice that the conrod, on the end that is to go to the crankshaft, have one side with a small oil hole with a long groove, and another side with just a short groove and no hole. Should the "hole side" face the conrod, or it should face the backplate?
the small oil hole should be facing the front of the engine.
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Old 04-07-2004, 05:58 PM   #3
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I've always concidered the flywheel end of engine as the rear, so the oil hole in rod goes towards the flywheel end and when piston is at TDC the skirt on piston should have the exhaust port closed.

Last edited by bbntc3; 04-07-2004 at 06:08 PM.
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Old 04-07-2004, 06:53 PM   #4
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Quote:
Originally posted by bbntc3
I've always concidered the flywheel end of engine as the rear, so the oil hole in rod goes towards the flywheel end and when piston is at TDC the skirt on piston should have the exhaust port closed.
is that true you call your back plate as front plate?
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Old 04-07-2004, 08:50 PM   #5
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Front plate back plate?? WTF?? I just thought you were kinda confusing, especially to a begineer. I see so called backing plates used on all type of engines and they are not facing the back of the engine, but.. still called backing plates. Call it what ever you want, most people consider the flywheel end of an engine as usually the rear of an engine.

Last edited by bbntc3; 04-07-2004 at 09:04 PM.
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Old 04-07-2004, 08:54 PM   #6
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Last edited by bbntc3; 04-07-2004 at 09:00 PM.
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Old 04-07-2004, 09:42 PM   #7
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Quote:
Originally posted by bbntc3
Front plate back plate?? WTF?? I just thought you were kinda confusing, especially to a begineer. I see so called backing plates used on all type of engines and they are not facing the back of the engine, but.. still called backing plates. Call it what ever you want, most people consider the flywheel end of an engine as usually the rear of an engine.
if you think i am making confusing statement to "NEWBIE", i rephase my suggestion here.

"the small oil hole should be facing the crankshaft"

so, newbie should be able to understand that no matter he calls it front plate or back plate ?.
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Old 04-08-2004, 06:37 AM   #8
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oil hole always faces the crank shaft. If not it will lock the rod on the crank pin.
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Old 04-08-2004, 02:40 PM   #9
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I never called it front plate you just suggested I did. Just remember newbie everything is backwards in HK. LOL
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Old 04-08-2004, 04:29 PM   #10
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Quote:
Originally posted by Manticore
is that true you call your back plate as front plate?
Or rear exhaust as front exhaust
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Old 04-08-2004, 08:55 PM   #11
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Quote:
Originally posted by Manticore
if you think i am making confusing statement to "NEWBIE", i rephase my suggestion here.

"the small oil hole should be facing the crankshaft"

so, newbie should be able to understand that no matter he calls it front plate or back plate ?.

You are so confusing the "NEWBIE"!!

"the small oil hole should be facing the crankshaft"

OR

"the small oil hole should be facing the Carburetor"
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Old 04-10-2004, 09:56 AM   #12
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Quote:
Originally posted by bbntc3
I've always concidered the flywheel end of engine as the rear, so the oil hole in rod goes towards the flywheel end and when piston is at TDC the skirt on piston should have the exhaust port closed.
Is it just me or are people getting dumber?
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Old 04-11-2004, 09:10 AM   #13
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I build in the neighborhood of 100 gas and diesel engines a year , and have done this for over 30 years.Some are over 2000 HP. The rear end of all engines I build in the most cases is the flywheel end. All though there is a few exceptions to the rule.
Thanks Manticore for clearing it up for the newbie.
Sparksy : It's just you!!!! You know where you can take the rear of your engine and stick it ??
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