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Old 04-19-2006, 05:36 PM
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press fit pistons

I have a set of eagle press fit rods,and KB130 pistons,and I pressed all of them on,but the box come with a set of spiral locks.Those are for only full floating rods right not sure.Also there is a chamfered end on these rods I put that end to the lobes on the crank,this is the first time I have pressed a set of after market rods on,but the pistons can go on either side,and there isn't a right or left,the way I did it was made sure the chamfered edge was to the lobes on the crank,and 1-3-5-7 I pressed where the rods would be closer the the front lobe on the crank,and 2-4-6-8 the chamfered edge would be closer to the back lobe on the crank hope this is right

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Old 04-19-2006, 06:39 PM
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How did you "press" the pins in?

Steve
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Old 04-19-2006, 06:47 PM
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I just used a hydrallic press at work,and some small peices of wood
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Old 04-19-2006, 06:57 PM
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Quote:
Originally Posted by dboyett38666
I just used a hydrallic press at work,and some small peices of wood

Chances are good you may have damaged your pistons, the skirts cannot take the pressure of the press

You need to heat up the (small) end of the rod, and the pin slides in with little difficulty.

Steve
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Old 04-19-2006, 07:17 PM
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I thought that was had they were made to go on.I have always pressed the pistons on the rod.There wasn't any binding,and the pins went in smooth.I have never heard that before,is there anyone way to tell?Wouldn't they have busted?
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Old 04-20-2006, 08:11 AM
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If you pressed them on cold,youve probably done some damage,the only way to tell,is to run them,if they end up in your oil pan,you know theyre damaged.
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Old 04-20-2006, 10:45 AM
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Not the right way but I've seen it work before. You have to keep the distortion out of the piston.
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Old 04-20-2006, 05:12 PM
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I called Keith Black,and asked a tech.He said that is shouldn't hurt anything.I have pressed every set on I've bought,and never had one come apart.I would understand if you had them sitting in there cocked or something but if you press it in straight and they don't bind your not going to have a problem.I would want to heat my rod or my aluminum piston
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Old 04-20-2006, 05:35 PM
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If you can move the piston on the pin with NO noticeable friction, you are probably ok. BUT, most competent machine shops heat the end of the rod to allow the pin to slip in without damage to the rod or piston.

tom
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Old 04-20-2006, 05:50 PM
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And . . . . to answer one of your original questions, the Spira-loks are only for bushed "floating" rods. As noted above, your pistons should float gently on the piston pins. I think the travel extremes of the pin, relative to the two bores, should be about equal (say, within .06 or so total variation), but I'd like to hear one of the machine shop guys ring on that issue.

Pat
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Old 04-20-2006, 06:12 PM
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There isn't any friction side to side,I done alot of stock rods but these rods are H beam rods,and I've never press these on but I know there was little stress on the piston,and I would have heated the rods,but they just pressed in really smooth
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