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Piston #1 or #2 or #3 or #4...??

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Old Feb 29, 2008 | 05:31 PM
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Default Piston #1 or #2 or #3 or #4...??

When putting the rods and pistons into the block, Does it matter if any of the four rods/pistons go in #1 and so forth..?? If so, How would I identify which rod/piston go in which bore in the block?? Thanks in advance!!
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Old Feb 29, 2008 | 05:38 PM
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It matters which rod goes in which cylinder, because that corresponds with a specific crankshaft journal, and the bearing clearance that you should have measured in some way,shape or form. Also, if you gapped the rings to a specific cylinder, you need to use them on that cylinder.

Does any of that make sense?
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Old Feb 29, 2008 | 05:56 PM
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Default Re: (Combustion Contraption)

Yes, NO.

Well, ok I just got the p30's put on my LS rods and now i'm putting them in. How would I find/match which rod to which bore?
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Old Feb 29, 2008 | 07:29 PM
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Default Re: (philliedawg)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by philliedawg &raquo;</TD></TR><TR><TD CLASS="quote">Yes, NO.

Well, ok I just got the p30's put on my LS rods and now i'm putting them in. How would I find/match which rod to which bore?</TD></TR></TABLE>

You need to spec out the clearances on each rod journal and rod. Then properly size the bearings for those specific rods which you plan to use on each specific cylinder. The same thing will go for your piston/ring combinations.
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Old Mar 1, 2008 | 05:58 AM
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Default Re: (bambam)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bambam &raquo;</TD></TR><TR><TD CLASS="quote">

You need to spec out the clearances on each rod journal and rod. Then properly size the bearings for those specific rods which you plan to use on each specific cylinder. The same thing will go for your piston/ring combinations.</TD></TR></TABLE>

Yo Bambam, Remember, I'm a noob to this game so is there a website where i can read more about this and see with pictures?
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Old Mar 1, 2008 | 06:06 AM
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Default Re: (philliedawg)

I urge you to not go any further until you have done a ton of reading man. All the information you need is on this site.

Do you have a Helms?
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Old Mar 1, 2008 | 06:08 AM
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Default Re: (philliedawg)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by philliedawg &raquo;</TD></TR><TR><TD CLASS="quote">, I'm a noob to this game so is there a website where i can read more about this and see with pictures?</TD></TR></TABLE>
You should have someone that has done it before help you. Get it wrong and you will be rebuilding your motor again very soon.
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Old Mar 1, 2008 | 06:12 AM
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Default Re: (b19coupe)

b19coupe,
Do you think if I just bring my rods, pistons and crank to a shop, there he can find out which rod go to which crank journal?
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Old Mar 1, 2008 | 08:28 AM
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Default Re: (philliedawg)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by philliedawg &raquo;</TD></TR><TR><TD CLASS="quote">b19coupe,
Do you think if I just bring my rods, pistons and crank to a shop, there he can find out which rod go to which crank journal?</TD></TR></TABLE>

A particular piston/rod combo doesn't necessarily correspond with a particular cylinder. The right thing to do would be to weigh each piston and rod separately and then try to mix and match each piston/rod combo to have the closest weights possible. You should then have the entire rotating assembly balanced.

You need to match the pistons to each individual cylinder by using a micrometer to measure the diameter of the pistons, and by using a dial bore gauge to measure the diameter of the cylinder bore. Subtract the diameter of the piston from the diameter of the cylinder....and that equals your clearance.
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Old Mar 1, 2008 | 02:30 PM
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Default Re: (bambam)

Thanks Bambam again! I'll try it out and see if I get it or not.
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