Guest Gp crazy Posted March 23, 2004 Report Share Posted March 23, 2004 I HAVE A 3.1 BLOCK BORED OUT TO 3.52 + 2.8 HEADS MILLED TO 0.05 I THINK THE CC=ABOUT 23 OR SO + THE SMALLEST DISH PISTION I COULD BUY + A HEAD GASKET OF 0.63 = C\RATIO OF HOW MUCH ? IF I GET A COMPRESSION TESTER IS THIS TRUE ? 199 PSI =9.4:1 OR SO WHICH = 89 OR HIGHER OCTANE 220 PSI = 11.5:1 OR SO WHICH = 93 OR HIGHER OCTANE I GET A DEAD MISS AT HIGH SPEED IN 3 OR HIGHER. BUT WHEN COLD IT RUNS GREAT UNDER 30 F . IF THE RATIO IS TO HIGH THE ENGINE WOULD JUST NOT RUN AT ALL CORRECT? THANKS JEFF Quote Link to comment Share on other sites More sharing options...
4spdz34 Posted March 23, 2004 Report Share Posted March 23, 2004 a compression reading will not tell u your compression ratio, the compression u develop is more of a characteristic of your camshaft profile. is that miss at WOT. what octane gas are u using? Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted March 23, 2004 Report Share Posted March 23, 2004 If you're on stock cam and have 11.5 CR thats why your detonating. Quote Link to comment Share on other sites More sharing options...
Guest Gp crazy Posted March 23, 2004 Report Share Posted March 23, 2004 3/4 TH IN GEAR 1 TO 2 ND IS GOOD 2 TO 3 RD IS GOOD BUT 3 & BEYOND IS THE PROBLEM. SAY I DRIVING AT 70 MPH THE RPMS ARE AT 3200 OR HIGHER THEN I LET OFF THE GAS AND THE MISS GOES AWAY. AT PART TH. IS FINE & THEN FLOOR IT AND IT MISSES UP TO 4000 AND THEN RUNS FINE :shock: IM STUMPED I GOT 40 PSI OF FUEL 18 IN OF VAC AT IDLE ENGINE LIGHT IS OFF EGR SEAMS TO BE WORKING FINE I WAS USING 93 BUT I JUST PUT IN 91 TODAY 1.99 A GAL AT IDLE IT SHAKES A LITTLE BIT BUT NO PING ON KNOCKING NOISE. HOW ABOUT PLUG'S STOCK 3.1 IM RUNNING SHOULD I GO TO COLDER PLUG OR SHORTEN THE GAP ? THE CAM IS A MELLING I THINK IT UP AROUND 224 IN 238 EX NOT SURE I DONT HAVE THE SHEET WIFE GOT CURIOUS AND THREW ALOT OF STUFF OUT THANKS JEFF Quote Link to comment Share on other sites More sharing options...
4spdz34 Posted March 23, 2004 Report Share Posted March 23, 2004 ya u should try colder plugs Quote Link to comment Share on other sites More sharing options...
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