ring end gap?

Old 10-02-2009, 07:21 AM
  #1  
taps
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JUNIOR BUILDER
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Default ring end gap?

what should end gap be 4.50 bore gas with 871 blower approx 10 to 15 pounds boost?
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Old 10-03-2009, 02:08 PM
  #2  
zipper06
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I think no one has answered this question because it's kind of a trick question, with many different answers. Example, are you planning to run conventional rings or z-gaps? will they be top z-gaps or second ring z-gaps, all different.
The biggest question of all is do you have true blower/nitrous pistons or are they conventional racing pistons?
The difference being that conventioal racing pistons the top ring is only down from the deck about .250, where a blower piston the top ring is down 7/16" or approx .440.
The blower piston ring doesn't take on as much heat as a conventional racing piston, therefore requiring less end gap.
O'k with that being said, blower piston none z-gap top ring, .0055/.006 X bore size. None blower pistons .0065/.007 X bore size.

Nitrous = same situation.

Worse possible serineo, too little gap will pull the top off the piston, too much end gap it may smoke a little and lose a little compression. i'll take too much any day day of the week.
I run .007 X bore size end gap on conventional forged pistons.
Also you need more piston to cylinder cleanance with a blower VS normally asperiated.

Below is Total seal recomendations.

Zip.

http://www.totalseal.com/TechPage.as...plessPistRings
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