adi2009 Posted October 18, 2005 Share Posted October 18, 2005 Had my compression test done with removing the fuel injection fuel and the results were cyl 1) 230psi " 2) 220psi " 3) 220psi " 4) 230psi " 5) 230psi " 6) 230psi Now how can this be possible??? only thing i can think of is that i pulled out the wrong fuse instead of the fuel injection fuse. Link to comment Share on other sites More sharing options...
JohnA Posted October 18, 2005 Share Posted October 18, 2005 Are they turbo pistons you've got in there? If so, the figures look a bit too high Link to comment Share on other sites More sharing options...
Guest Terry S Posted October 18, 2005 Share Posted October 18, 2005 Its an NA so must assume it still has NA Pistons in there with those # Link to comment Share on other sites More sharing options...
adi2009 Posted October 18, 2005 Author Share Posted October 18, 2005 Ya John, they are from the TT engine. thats what i was thinking too, way too high for the TT isnt it. would be very helpful if someone can post a pic of which fuse exactly i have to pull b'fore doing the test. Link to comment Share on other sites More sharing options...
JohnA Posted October 18, 2005 Share Posted October 18, 2005 I don't think that pulling the FI fuse would have such an impact on the figures (if at all!) You should be looking at 170-180 roughly with turbo pistons Link to comment Share on other sites More sharing options...
tDR Posted October 18, 2005 Share Posted October 18, 2005 We fitted custom spec low compression (8:1) JE forged pistons to a 3S-GTE engine along with Total Seal gapless rings. After running it in, we compression tested it and got 190psi in each cylinder - higher than we were expecting given it was around 180psi standard with 8.5:1 standard compression ratio. Now the spec sheet with the rings was confusing, mentioning both file fitting the rings and saying they came ready to fit with no file fitting required so we went with the lube everything up and fit them with a ring compressor method. Anyone any ideas on whether this could effect the compression results obtained? I think I'm confused about this because you measure dynamic compression rather than static compression when you do a compression test, don't you? Cheers, Brian. Link to comment Share on other sites More sharing options...
JohnA Posted October 18, 2005 Share Posted October 18, 2005 yes, if the cam timing is different, you get different figures. Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 18, 2005 Share Posted October 18, 2005 Total Seal, like most American companies, can't or won't make a ring pack to fit a designated bore size, they expect YOU, the end user, to do it for them. I suspect they are too tight, and bore scoring / seizing may result. "Gapless" rings (no such thing, really) have been well proven in Formula race engines to no measurable effect in normal use, they attract attention because at very low RPM's (cranking speeds) they show increased compression due to less leakage, whilst at real world running RPM's they seem to do nothing that a conventional ring pack does. An Omega or Cosworth ring will fit a desinated bore size, bang spot on, with no work at all, as they are actually CAST for that bore size, not generically for X to Y bore sizes, with different tensions and roundness in different bores. Link to comment Share on other sites More sharing options...
JohnA Posted October 19, 2005 Share Posted October 19, 2005 I would have thought that at operating temps and full load, 'normal' rings are also gapless Link to comment Share on other sites More sharing options...
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