Will I be OK?
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Will I be OK?

  1. #1
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    Default Will I be OK?

    Hi guys, I am new to the forum and would like some advice.

    I just got done rebuilding my 502 from my DCB 22. Here is where it is now.

    4.503 bore
    JE - 257961 pistons
    AFR 345's
    Custom grind Comp cam
    Manley Rods.

    Just a quick rundown of what is in the motor, My big concern is my rings gaps. I talked with a few people and I went with these for ring gaps

    Top - 0.027"
    2nd - 0.024"

    My biggest question is will this be acceptable? Colling system is a raw system and the block really never gets too hot.


    I am running a B&M mega 420 @ 10psi or plan to run 10psi. Static compression is 8.7:1

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    Senior Member 67weiman's Avatar
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    What type of rings are they?

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by sultan.of.swing View Post
    Hi guys, I am new to the forum and would like some advice.

    I just got done rebuilding my 502 from my DCB 22. Here is where it is now.

    4.503 bore
    JE - 257961 pistons
    AFR 345's
    Custom grind Comp cam
    Manley Rods.

    Just a quick rundown of what is in the motor, My big concern is my rings gaps. I talked with a few people and I went with these for ring gaps

    Top - 0.027"
    2nd - 0.024"

    My biggest question is will this be acceptable? Colling system is a raw system and the block really never gets too hot.


    I am running a B&M mega 420 @ 10psi or plan to run 10psi. Static compression is 8.7:1
    So are you going .0060"/inch of bore on the top ring and .0055"/inch of bore on the 2nd? Is that what the sheet is telling you for a "blown gas" engine?

    The math on the 2nd ring should actually round to .025", remember, that's "suggested minimum", however many of the spec sheets are calling out for .0010"/inch of bore more on the 2nd ring now. For example, one set I currently have here is asking for .0055"/inch of bore top ring, and .0065"/inch of bore on the 2nd ring.


    If it's already together, it should run fine.
    Last edited by obnoxious001; 10-24-2011 at 07:04 PM.

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    Quote Originally Posted by 67weiman View Post
    What type of rings are they?
    The pro seal rings that came with the pistons,will have to look tomorrow to see if they are moly rings. I ordered the pistons since they are FI friendly.

  6. #5
    gn7
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    Quote Originally Posted by sultan.of.swing View Post
    The pro seal rings that came with the pistons,will have to look tomorrow to see if they are moly rings. I ordered the pistons since they are FI friendly.
    Your kidding me right? They are now selling rings as being FI compatible? WTF? Does the engine require special FI compliant oil and sparkplugs?
    Last edited by gn7; 10-24-2011 at 07:23 PM.
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    Quote Originally Posted by obnoxious001 View Post
    So are you going .0060"/inch of bore on the top ring and .0055"/inch of bore on the 2nd? Is that what the sheet is telling you for a "blown gas" engine? The math on the 2nd ring should actually round to .025", remember, that's "suggested minimum", however many of the spec sheets are calling out for .0010"/inch of bore more on the 2nd ring now. For example, one set I currently have here is asking for .0055"/inch of bore top ring, and .0065"/inch of bore on the 2nd ring.If it's already together, it should run fine.
    The sheet called for .0060 for blown gas top and bottom but the je rep recommended the .055 on the second ring. I am concerned and wondered if I will encounter top ring flutter. I Would feel safer with 0.030 on the top ring and 0.032 on the second ring. Think I can safely get the rings back off and open them up some more? This motor needs to last a while.If 0.027 and 0.024 will work then I will leave it as is.

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    Quote Originally Posted by gn7 View Post
    Your kidding me right? They are now selling rings as being FI compatible? WTF? Does the engine require special FI compliant oil and sparkplugs?
    I was referring to the pistons being FI friendly, not compatible.

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    Quote Originally Posted by gn7 View Post
    Your kidding me right? They are now selling rings as being FI compatible? WTF? Does the engine require special FI compliant oil and sparkplugs?

    Not having the correct rings could be the cause of a DNF, just sayin........
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    gn7
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    Quote Originally Posted by Bubbletop409 View Post
    Not having the correct rings could be the cause of a DNF, just sayin........
    wish I could blame that on the rings. That would be too easy
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    This is the ring set that I used.
    J100F8-4500-5 Product Detail Information - JE Pistons

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by sultan.of.swing View Post
    The sheet called for .0060 for blown gas top and bottom but the je rep recommended the .055 on the second ring. I am concerned and wondered if I will encounter top ring flutter. I Would feel safer with 0.030 on the top ring and 0.032 on the second ring. Think I can safely get the rings back off and open them up some more? This motor needs to last a while.If 0.027 and 0.024 will work then I will leave it as is.
    Keep in mind that the suggested minimum gaps are "minimum", supposed to keep the ends from butting together. Thinking has been changing on what gaps work best, but I don't think you have to pull the pistons back out of the block for your engine to make changes.

    What is it that changed your mind about what gap you should have versus how you have them gapped?

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    Quote Originally Posted by obnoxious001 View Post
    Keep in mind that the suggested minimum gaps are "minimum", supposed to keep the ends from butting together. Thinking has been changing on what gaps work best, but I don't think you have to pull the pistons back out of the block for your engine to make changes.What is it that changed your mind about what gap you should have versus how you have them gapped?
    RResearch and the fact that when i can trim the boat right I will run 115mph for several miles so the heat is another concern.Gonna be keeping a close eye on my J&S Safeguard

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    Quote Originally Posted by sultan.of.swing View Post
    RResearch and the fact that when i can trim the boat right I will run 115mph for several miles so the heat is another concern.Gonna be keeping a close eye on my J&S Safeguard
    My background goes back to building marathon ski race engines in the 90's at GT Performance, when the conventional thinking was the larger top ring gap. Based on the large number of engines assembled that way, I would have to say yours will be OK.

    However, if you need to pull it apart and open the gaps up a few thousandths to sleep better, I wouldn't talk you out of it.

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    Quote Originally Posted by obnoxious001 View Post
    My background goes back to building marathon ski race engines in the 90's at GT Performance, when the conventional thinking was the larger top ring gap. Based on the large number of engines assembled that way, I would have to say yours will be OK.However, if you need to pull it apart and open the gaps up a few thousandths to sleep better, I wouldn't talk you out of it.
    I appreciate the help kind sir,it would probably be best just to open them up a bit. Gonna sleep on it for tonight.

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