80LS1T Posted January 10, 2003 Share Posted January 10, 2003 Well I going to go with KB Hyper. ligh weight pistons for my LT1 with a 11.1:1 CR. I am also going to go with Plamsa Moly rings and the question I have is about the size... I am boring the engine over .030 so when I select a ring size should they be .035 over? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
80LS1T Posted January 10, 2003 Author Share Posted January 10, 2003 Oh yeah and what is ring tension? They have standard and low? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
80LS1T Posted January 11, 2003 Author Share Posted January 11, 2003 Doesn't anybody know this stuff? Guy Quote Link to comment Share on other sites More sharing options...
80LS1T Posted January 13, 2003 Author Share Posted January 13, 2003 Come on guys! I really need the help here! I gotta order these soon. Guy Quote Link to comment Share on other sites More sharing options...
blueovalz Posted January 13, 2003 Share Posted January 13, 2003 No expert here, but until someone that is chimes in, I'll take a stab at it. The .035" over rings will be fine, just like any .030 rings will be in the important fact that you will, regardless of which set you get, check the end gap with the rings in the bore prior to assembling the block. The manufacturer will provide a suggested gap depending on your application (stock, racing, NOS, turbo or supercharger, etc) and it will be up to you to ensure the end gap is within this range, which may entail some removal of material from the ends of the ring. Personally, I'd never use any set of rings without checking the end gap prior to putting them on the piston. When you do this, also be sure to keep the rings dedicated to the cylinder they were tested in (one set for each cylinder). There will be very tiny variances between cylinders if you use the Joe Blow machine shop down the street. Perhaps you can answer a question for me now. I was under the impression that the Hyper pistons used in high compression applications would be quite susceptible to shattering if detonation occurred (verses a forging). Is this true, and are you comfortable with this if so? Quote Link to comment Share on other sites More sharing options...
80LS1T Posted January 13, 2003 Author Share Posted January 13, 2003 I didn't know about that piston shattering thing you described?! I assumed since they made them in 11.1:1 that they would be ok? I am not going to supercharge my engine anytime in the near future or use NOS(that I know of). From what others have said I thought I should use hypers because there is less piston slap. Do you think I should go forged or will these be ok in my LT1? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
blueovalz Posted January 14, 2003 Share Posted January 14, 2003 Well, as I said, I'm not an expert here. I've read some stuff from the manufacturer and talked to race engine builders, and the consensus is that the Hyper piston is a good "fill-in-the-gap" piston for someone wanting a "stronger than cast" piston but cheaper than a forged piston. They are indeed stronger, but more brittle (like tempered glass is vs regular glass) than regular cast pistons. It appears that high compression and/or high rpm (both of these are subjective descriptions) are not a friend of any cast piston, and yes, the hypers are stronger, but you may want to investigate this area with people that have had experience with these pistons. They may be great for what you need out of them. I was simply voicing some concern as I had thought about a set for myself, but at 10.3/1 ratio (pump gas) and 7500 rpm, I wanted my motor to be good for a long time (if that's even possible). I just decided to spend the extra money and go forged. Simply my opinion and not expertise here. Hypereutectic piston info Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 14, 2003 Share Posted January 14, 2003 I agree with Terry on this with a disclaimer that I am not an expert....I am also concerned about the high compression without a forged piston. Can you come down on your compression ratio? Looks like the KB Hypers are sold for high compression ratios. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted January 14, 2003 Author Share Posted January 14, 2003 Well I have no real knowledge of engine building. That's why I'm asking you guys. I am a student in Tech school for Automotive Technology(2 year assoc. degree) and I am going to have my engine machining class at the end of February and I would like to have everything together so that I can build my engine without having to wait for parts that might not be there in time(6 week class). Here is my set up...tell me what you guys think a good compression ration would be... 58mm TB, block hugger headers with 2.25"dual exhaust till the axle then into 3" single into high flow muffler, #36 bosch injectors, stage II port and polish of heads and intake and port matched runners, LT4 Hotcam kit, MSD 6AL ingnition system, and some computer tuning. The reason for the 11.1:1 CR is that I figured since the LT4's have 10.8:1 I would bump it up a little to get some more power. The reason that I thought I should go with hypers is because most guys say that since I'm not going to SC, Turbo, or use NOS they I should stay with Hypers to avoid as much excessive piston slap as possible. But if I'm going to break pistons then that would be kinda stupid to worry about piston slap. Please clue me in on what an ideal compression ratio would be and what kind HP I should expect with it. Thanks for all the help! Guy Quote Link to comment Share on other sites More sharing options...
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