Dyzza Posted April 29, 2006 Report Posted April 29, 2006 hey guys I did a search trying to find standard compression rates for a 4k (in PSI) but had no luck ... i did a test on my 4k - 125 was about average, highest 127 lowest 121. Is this low? I noticed someone on here had a 5K with 10.1 compression and managed 225 average ... :P Cheers, Dyzza Quote
Dyzza Posted April 29, 2006 Author Report Posted April 29, 2006 hey actually it might have had one done ... the last bloke, on carsales, just put like 'headwork, camshaft...' like that ... i didn't ask any questions ... Cheers Quote
Trev Posted April 29, 2006 Report Posted April 29, 2006 Did you do a wet compression test or a dry one. Quote
Dyzza Posted April 29, 2006 Author Report Posted April 29, 2006 ah ... well never heard of that terminology before, but this is what i did do .. screwed thread into cylinder 1 (screw in guage type), took lead of dizzy cap, pumped accelerator a bit as i turned the motor over. .. stopped, read guage, reset it, put spark plug back in cylinder 1, went onto cylinder 2... Dyzza Quote
Felix Posted April 29, 2006 Report Posted April 29, 2006 you should have the throttle fully open when you do a compression test. a dry compression test is what you have done. if you get low readings from a dry test you do a wet test. a wet compression test is when you put a teaspoon or so of oil down the plug hole. if the compression increases on a wet test, it means your ring seal is suspect. no improvement means the valves or headgasket is the culprit. Quote
Dyzza Posted April 29, 2006 Author Report Posted April 29, 2006 if you get low readings from a dry test you do a wet test. a yeah ... but i don't know my readings are low ... thats what i really wanna know I'll give that a shot too :P Quote
ronald_loulan Posted April 29, 2006 Report Posted April 29, 2006 I tested my 4k(carb) n the result r 140,135,130,150(psi)... I just overhaul the engine last month.... All stock,just the exhaust is diff... Is the test result good..?? Quote
ronald_loulan Posted April 29, 2006 Report Posted April 29, 2006 I found this a long time ago.... Engine Engine Displacement (cc): 1290 Firing Order: 1342 Spark Plugs Type: Denso W16EP Gap (mm): .80 Compression Pressure (psi): 127-156 Distributor Make: Bosch DWELL: 50±2 Point Gap (mm): .40-.50 Ignition Timing Initial/Static: 8@Idle C/S Fuel System Make/Type: Aisan Float Level (mm): 7.5 Idle Speed (rpm): 750N Emission CO%: 0.3-2.0 Fuel Pump Pressure (psi): 2.8-4.3 Fuel Capacity (cc/min@rpm): 900@5800 Oil Pressure (psi): >45@3000 Valve Clearances Inlet Hot/Cold (mm): .20 Exhaust Hot/Cold (mm): .30 Torque Specification Cylinder Head (ft.lbs): 39-47 Main Bearings (ft.lbs): 47-49 Con Rods (ft.lbs): 29-37 Quote
love ke70 Posted April 29, 2006 Report Posted April 29, 2006 i got 1 - 160 2 - 160 3 - 145 4 - 160 but i think my gauge is old and overreads.... anywho, expect around 160 from a good, stock engine if you have had a cam grind you will get less because there is a bigger overlap of intake and exhaust (is it only me that this makes two thirds of bugger all sense to?) Quote
Teddy Posted April 29, 2006 Report Posted April 29, 2006 lol atm mine would be aroud 250 each cylinder :P Quote
Felix Posted April 29, 2006 Report Posted April 29, 2006 250psi.... you got a diesel in it now? :P Quote
Dyzza Posted May 3, 2006 Author Report Posted May 3, 2006 anywho, expect around 160 from a good, stock engineif you have had a cam grind you will get less because there is a bigger overlap of intake and exhaust (is it only me that this makes two thirds of bugger all sense to?) yeah man i hear ya ... doesn't make the most sense to me either ... hmm ... sounds as though the inlet is still open while compression is occurring ... wouldn't that be detrimental performance-wise ? Dyzza Quote
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