SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: speedymopars on January 07, 2008, 10:20:34 PM
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I have 4.382 diameter KB Hyper pistons in my 452 I'm building. The issue started when 3 of the pistons wouldn't fit in the hole. It turns out that the skirt on one was 4.394 while the ring area was 4.382 like it was supposed to be. On two of the others, the skirt was 4.388.
Luckally, that large diameter was on the first piston that tried to go in.
This got me thinking, gee, what if this piston had been machined .002 large instead of .012 large? I wouldn't have noticed. I bet no one would have noticed. It would have installed in the block, and fine ran too. That is, until one day I ran it a little longer and harder than normal. The piston would have then sized in the bore, and shattered in a million pieces.
Is this the real reason why some people have issues with the hyper pistons while millions of others don't?
Anyway, I called summit racing (where I bought them), and they sent a truck and replaced the pistons ASAP. Summit has my business for a long time.
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Summit has always great to deal with, as far as I'm concerned. I screwed up an order and had lost the return slip, got instructions from them how to do the return and they shipped out what I really wanted almost before I got to the UPS store to return my screw-up. They've got my business. Fast shipping too, over night for the most part and no shipping charges.
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Odd.... every Mopar KB hyper piston I've gotten from Summit I've checked, good thing they took care of you though
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Odd.... every Mopar KB hyper piston I've gotten from Summit I've checked, good thing they took care of you though
I'm wondering if one of the lathe blades died or something.