WTF @ compression results
#1
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WTF @ compression results
ok first of all 85 gsl-se block all stock
now I did a compression test with the starter running at 250rpms like it should
front rotor is great
go to do back rotor and I get two bounces and then one nothing two bounces a nothing etc.... so I think broken side seal but then as I'm about to signal my cohort to stop turning over the engine it starts three bounces.... so I think well I guess it was stuck lets let it turn over for a while and see what happens... it runs good so I am about to signal my cohort when bam! no compression at all from any face! so... I'm thinking WTF and then I get compression again on all three... so I'm not sure what the hells going wrong I've rebuilt several motors before and without question this one is going to be rebuilt for safe measure (also I've been meaning to move to higher compression rotors and port the engine) but does anyone know what could be causeing the problem...?
my only guess is that it is screwed up side seals that keep sticking and unsticking...
got the engine for free so its no big deal as I still have my other engine in my rx with 120+ psi on both rotors after 160k miles, gotta love first gen reliability!
now I did a compression test with the starter running at 250rpms like it should
front rotor is great
go to do back rotor and I get two bounces and then one nothing two bounces a nothing etc.... so I think broken side seal but then as I'm about to signal my cohort to stop turning over the engine it starts three bounces.... so I think well I guess it was stuck lets let it turn over for a while and see what happens... it runs good so I am about to signal my cohort when bam! no compression at all from any face! so... I'm thinking WTF and then I get compression again on all three... so I'm not sure what the hells going wrong I've rebuilt several motors before and without question this one is going to be rebuilt for safe measure (also I've been meaning to move to higher compression rotors and port the engine) but does anyone know what could be causeing the problem...?
my only guess is that it is screwed up side seals that keep sticking and unsticking...
got the engine for free so its no big deal as I still have my other engine in my rx with 120+ psi on both rotors after 160k miles, gotta love first gen reliability!
#5
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Yea maybe seafoam would repair it I've had wondrous results with it before but there are numerous things I want to do with the engine internals anyways so I'm just goign to rebuild it... it occurred to me though that it may be because the engine has been sitting and even though I put a little oil in the engine before turning it over its just a little dry...
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blown side seal = two compression readings
blown apex = one compression reading
Are you sure your compression tester is not the problem? It seems strange that it (the engine) would bounce back and forth between compression and no compression.
blown apex = one compression reading
Are you sure your compression tester is not the problem? It seems strange that it (the engine) would bounce back and forth between compression and no compression.
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#9
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Good idea jeff before I take it apart for the rebuild I'm going to try that and see if I can get some good compression out of it... just for future refrence
#10
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Tried the MMO and after turning over for a few seconds I was able to get about 90 on both rotors... If I was going to run it I would probably dump some seafoam in it and see how things are doing in a week or so... I guess the side spring seals were just dry and stuck... Thanx everyone!
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