Why do we emphasize putting the rod bearing tangs on the exhaust side of the conrod? It's common knowledge that the service manual explicitly says to do so, but is there a strong engineering/design reason for doing things that way?

The reason I ask is b/c I'm up the creek with a set of ITR pistons and rods that have been assembled backwards so that the tangs face the intake side of the piston.

I'm hesitant to have any machine shop (unless they have Honda-specific tools and knowledge) to press out the wrist pin for fear of them breaking any of the brand new pistons. A local machine shop has broken one of four on a used set I wanted to do measurements on so it was no biggy. That's where that precedence comes from.

I'm looking for a good reason as to why I cannot run them as is, or a way for me to safely re-assemble them myself.

I swear to God machine shops are the weakest link in any engine build. If you're in my area, don't ever go to D&B on the south side of Indianapolis...and it's not just for this one reason either.

 

hmm that is shitty man. i guess i have never really researched why it is done that way and if it would matter if it was the other way. i am assuming that there is some benefit to running them the way they do but i really dont know. hopefully somebody can clear this up and we can all learn something TTT. somebody help this guy out

 

u can remove the wristpin urself, with a little heat

 

Wanna come up here and help me? We've still got a 24 pack of Coors icing in the fridge and some hard liquor to mix.

 

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

I swear to God machine shops are the weakest link in any engine build. </TD></TR></TABLE>

Yes. Isnt that the truth.

Im fairly sure it wont matter to any catastophic degree. But as far as personal experience ive never put any in backwards, even in the day before i knew that was the case i still got lucky with putting the "tangs" or "tabs" on the exaust side.

But there is the other case that it is probably done for a reason, as much as i hate saying that, But i really cant think of it, because the rod gets the oil from the crank (static), and the bearings have the holes in them for the corresponding holes on the rods (static due to the fact that the tangs wont let you put the bearing in backwards). I cant see it being a problem, but that doesnt mean im right...

-sander


Modified by sander at 2:55 PM 11/9/2004

 

That sucks. Pistons always get distorted a little when press pins are pushed out.

 

P72 rods, so no oil holes to worry about....just the tangs.

I'm really inclined to try something, so if anything, I've found a used Honda-spec'd pedestal that I can use or I'll order the damned thing from Baranco...even if it does cost upwards of $185 for the whole shehbang.

Rocket, you're such a romantic. Hearing those sweet words makes me want to shoot myself in the neck with a potato gun.

 

so your gonna take the pins out???? anybody else have any input. i cant see why it wouldnt work unless somebody out there has a factual answer to why it wont/shouldnt.

 

I'll probably take it up with Stewart Engines this weekend since we're going there for an elementary engine building seminar. Maybe they'll have something useful to add.

 

I think they do it that way is because when the most force is being pressed against the bearing(during peak combustion pressures),the rod is being pushed in a way that it sorta locks itself in place against the tab...

Instead of pushing from the other end...I dont know,i just confused myself///lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IN VTEC &raquo;</TD></TR><TR><TD CLASS="quote">P72 rods, so no oil holes to worry about....just the tangs.</TD></TR></TABLE>

Ahh, right you are, i was thinking non-vtak rods.

-s

 

back from the dead!!,

can someone explain this.. why the tangs have to be on the exhaust side..also why P72 rods dont have oil holes in the rods and LS's do??

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PyroProblem &raquo;</TD></TR><TR><TD CLASS="quote">I think they do it that way is because when the most force is being pressed against the bearing(during peak combustion pressures),the rod is being pushed in a way that it sorta locks itself in place against the tab...

Instead of pushing from the other end...I dont know,i just confused myself///lol</TD></TR></TABLE>

im thinking this guy is thinking on the right track???

 

I know someone who put the rods in backwards and his motor did not blow up. I still would not try it though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1.6i &raquo;</TD></TR><TR><TD CLASS="quote">back from the dead!!,

can someone explain this.. why the tangs have to be on the exhaust side..also why P72 rods dont have oil holes in the rods and LS's do??

im thinking this guy is thinking on the right track???</TD></TR></TABLE>

He's on the right track.. Also gsr rods do not have oil holes because they have oil squirters in the block, so why need an oil hole?

 

I'm pretty sure that it is done like that.So everything is kept track of the way it goes.Otherwise if the rods where put on different on 2 of them .How would you know which way they went.You can't always tell by the valve relieves on the top of the pistons.I really don't think it will hurt .As long as the pistons are in correct.
Rods are simitrical on both sides.But pistons aren't.The tops are different.And some have offset wrist pins.
When you buy a set of pistons for a V8 with and exta one.You get 10 pistons.One for each side.