looking for a good piston ring compressor
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looking for a good piston ring compressor

  1. #1
    senior member turbo wog's Avatar
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    Default looking for a good piston ring compressor

    i have used the old type & bought the new mack one & i am not having any luck.here are some pics. the old one is striped out & the new one doesn't compress the rings enough to get in the cyl. i had to use a rubber mallet & tap around the mack one to get it to settle in enough to maybey go in . major fight & i lost 2 second rings & 2 oil rings. 3 different pistons . i swear i'm not a tard. any tips or better tool info apriciated.
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    Senior Member SoldHondaBoughtHondo's Avatar
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    I had same problem...especially oil ring rails....i ended up using a large hose clamp....over the ring compressor and ground the clamp mechanism flat on one side so it would flush against the block...a couple of the compression rings gave me guff...i have a piece of hardwood i used to use on motorcycle pistons to work the rings in...
    And the wood handle on a plenty light body hammer to 'lightly tap' the piston down


    If you are breaking parts you are using about twice as much force as necessary......if it won't load in reasonable easy might be a good time to put your glasses on and find out why
    You did check end gap, correct? I think mine were @ .024-.026...on a 4.250
    Last edited by SoldHondaBoughtHondo; 05-22-2011 at 02:11 AM.
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    Living in a cage of fear thatguy's Avatar
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    Is there any chamfer on the top of the cylinders?
    I've used both of those compressors with no problems.
    The less chamfer, the more critical it is to be squared up before the final "smack".

    Load the piston in the cylinder, position ring gaps as needed, put the tool over it and FLAT on the deck, , raise piston up by the rod end underneath, squeeze until partially tight, tap lightly to square it up, squeeze again to compress fully, repeat, then whack it in. If everything is right it should go.

    Sounds like you have a sharp edge on the deck to Me.

    I've had some oil rings that required care to compress fully. Had to squeeze the tool a little bit to get the ends in, then made sure I could move the ring and tool freely in the groove before squeezing it all the way tight.
    Last edited by thatguy; 05-22-2011 at 10:43 AM.
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    I'm sure you are aware, but worth mentioning just in case. There is a taper to the MAC compressor. One side is smaller (taper) and has a direction arrow to push the piston in.
    Just a thought.
    Good luck, be safe. schick
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    Senior Member bville's Avatar
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    Buy a one piece ring compresser for your bore size.Once you do your done damaging rings and you will never go back to an adjustable ring compresser.

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    Quote Originally Posted by bville View Post
    Buy a one piece ring compresser for your bore size.Once you do your done damaging rings and you will never go back to an adjustable ring compresser.
    X2...anything else is "OLD" school...i have been useing them for 30+ years & have never broken any rings...so simple to use ...you can find them on EBay in .030 & .060 sizes for BBC...just sayin' my .02 cents

    FastRat

  9. #7
    steelcomp was here
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    Quote Originally Posted by turbo wog View Post
    i have used the old type & bought the new mack one & i am not having any luck.here are some pics. the old one is striped out & the new one doesn't compress the rings enough to get in the cyl. i had to use a rubber mallet & tap around the mack one to get it to settle in enough to maybey go in . major fight & i lost 2 second rings & 2 oil rings. 3 different pistons . i swear i'm not a tard. any tips or better tool info apriciated.
    The minute you have to hit anything on en engine hard enough to do that kind of damage, STOP! Don't just keep beating on it! Nothing about an engine's assembly should ever take that kind of force. If it does, there's something very wrong, as you found out.
    Tapered ring compressors are the only way to go. I use the same adjustable compressor you have when I don't have the right tapered compressor, and never, ever had a problem. I do the sale thing as Tommy (thatguy)...set the piston in the bore, open the compressor up so it slides easily over the rings, then set it flat on the deck of the block, then gently tighten it up over the rings. I don;'t even lift the piston. As I tighten the compressor, I gently tap on the top of it with a plastic mallet to keep it over the oil rings and square with the deck. Once it's tight and the rings are fully compressed, with the butt end of the handle of the plastic mallet just gently tap the piston into the cylinder. If it takes more than that, again, STOP! Something's not right and you need to start over. The cylinders should only need a small chamfer if everything is right.
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    senior member turbo wog's Avatar
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    well my block is .100 over so the chamfer is probable not as good as it used to be. i am using atf instead of oil this time. i squeezed the rings so tight i had to bop the piston harder than usual using a rubber mallet . i did have the mack tool the correct direction.i wound up aligning the opening on the mack tool with the notch in the block to help guide the little bit of ring still hanging out into the cyl. gapped the top ring at .035 & the 2nd at .026 ( going to try to get some nitrous & higher boost going) . i did just order a one piece billet aluminum compressor for my bore size today from summit. thanks guys!

  11. #9
    gn7
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    And if you oil rings are not assembled and set right in the groove, none of the above is going to help.

    If you can go for the size specific tapered deals, than like Steel said, this is the next best thing, and great for when your working with some off size.
    At less than 30.00, its probably the best all around setup.




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    Quote Originally Posted by turbo wog View Post
    well my block is .100 over so the chamfer is probable not as good as it used to be.
    The chamfer at the top of the bore has nothing to do with the overbore and everything to do with the machinist who bored it.



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    Quote Originally Posted by gn7 View Post
    And if you oil rings are not assembled and set right in the groove, none of the above is going to help.

    If you can go for the size specific tapered deals, than like Steel said, this is the next best thing, and great for when your working with some off size.
    At less than 30.00, its probably the best all around setup.
    I use this one and can bump the piston in there with my hand. Dont tighten the piss out of one of these, its not necessary.
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    senior member turbo wog's Avatar
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    Quote Originally Posted by Hass828 View Post
    I use this one and can bump the piston in there with my hand. Dont tighten the piss out of one of these, its not necessary.
    what brand is this one?

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by turbo wog View Post
    what brand is this one?
    Tavia, here ya go
    Tavia 08980 - Tavia Adjustable Tapered Ring Compressors - Overview - SummitRacing.com
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