J_R
05-11-2007, 09:11 PM
Any guesses on about what that should be?
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Join in on this Discussion and see the pictures. Click here-> : Compression on a engine w/ 6:1 compression ratio.
J_R 05-11-2007, 09:11 PM Any guesses on about what that should be? Terrh 05-11-2007, 09:22 PM umm, depends entirely on a ton of variables. I'd think anything over 60psi should make you happy... "ideal" is probably 75psi. even results (all cyls the same) is far more important anyways. J_R 05-11-2007, 09:56 PM I guess I should be more specific. 2L I6 ...RB20DET, everything I've read says 180ish for compression on these motors but I am sure it only has a 6:1 ratio(b/c of the turbo) so 180 seems high to me. J_R 05-11-2007, 10:47 PM OK they are 8.5 to 1 on RB20DET 180 still seems high, mine are 120ish. Zero 05-12-2007, 11:34 AM How about... a nissan forum? J_R 05-12-2007, 12:02 PM b/c they will just look at the book say 12bar @300 Rpm and say my motor is done. Savington 05-12-2007, 08:55 PM You're saying that you want us to tell you your motor is fine even though a Nissan forum says it isn't? Fuck off. J_R 05-12-2007, 09:15 PM I don't give a fuck if you think my motor is fine or fucked. I am just trying to get a idea of what an engine w/8.5:1 compression would be for numbers b/c the car pulls hard, runs great, doesn't burn oil, and the plugs aren't soaked in oil. But has 120PSI of compression, which apparently is shit. Terrh 05-13-2007, 09:27 AM 120psi isn't /that/ bad. BIG difference between 8.5:1 and 6:1 LOL. Tofuball 05-13-2007, 09:31 AM 6:1 compression ratio? Thats hilarious. :P 120PSI aint so hot, do a leakdown test to find out if its your rings or something head related (such as cam timing) J_R 05-13-2007, 11:57 AM I probably should do a leakdown test, but I don't have a problem with my engine. It is just that when this comes up on other forums people condemn the motors to which I don't think is right if mines drives great w/ 120PSI compression. BIG difference between 8.5:1 and 6:1 LOL. I know, sorry... Terrh 05-13-2007, 09:42 PM turbochargers can hide alot. my rx-7 runs fine with 110 psi compression :P and it's 9.0:1! aznpoopy 05-13-2007, 11:01 PM google.com search for "rb20det compression" 150psi seems average for used motors by the book is 171 @ 300 120 seems low. but if its even across all cylinders and it runs fine, then who cares? drive it as it is. rb20 longblocks are cheap anyway. Tofuball 05-14-2007, 06:52 AM turbochargers can hide alot. my rx-7 runs fine with 110 psi compression :P and it's 9.0:1! Well, yeh, 110 is good for an RX-7 ;P Operating range. Just don't go below 85 . . . . . . I knew a guy who daily drove an 86 Base with 0-0-62F and 0-61-60R, it ran fine, sounded like crap, and got horrible fuel economy and acceleration :D . . . then after about 8 months it died, never to start again. ReverendDexter 05-15-2007, 10:09 AM . . . I knew a guy who daily drove an 86 Base ... it ran fine, sounded like crap, and got horrible fuel economy... Wait, isn't this every RX-7? ...and acceleration nevermind... Tofuball 05-15-2007, 01:29 PM Nah, my 'vert got pretty sweet MPG. wotnartd 05-15-2007, 08:26 PM Nah, my 'vert got pretty sweet MPG. My S4 NA gets about 24 mph at highway speeds. ReverendDexter 05-18-2007, 03:30 PM I can pull 24 out of the Cobra at highway speeds (26 if it's a long burn down I5 where I can set the cruise at 72 for hours), what do you average across a normal tank of gas? Tofuball 05-19-2007, 07:59 AM At 80mph sustained with a few WOT pulls up on ramps I pulled ~26mpg. My TII is incapable of that . . . for now. |
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