nismo13GTiR
12-09-2001, 04:14 AM
Just wanted to know if there was a difference between the Bluebird SR20DET Pistons and the STOCK SR20DE Pistons? And is their compression different? Thanks
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Yellow4g63 12-09-2001, 05:26 AM I think the BB is 8.5.1 and the DE is 9.5.1 hope that helps nismo13GTiR 12-09-2001, 02:31 PM Could you please tell me where you got that information? Thanks Yellow4g63 12-10-2001, 01:18 AM check SE-R.net blairellis 12-10-2001, 10:29 AM it is 9.5 for de and 8.5 det like he said....ive done too much research on this so i couldnt tell you a specific spot where i got it TurbochargedSER 12-10-2001, 11:49 AM Originally posted by Yellow4g63 I think the BB is 8.5.1 and the DE is 9.5.1 hope that helps The Bluebird DET and GTiR DET use the same pistons. The GTiR has a CR of 8.3:1 becuase of the quench area in the head! v8killer2001 12-10-2001, 06:44 PM The Bluebird DET and GTiR DET use the same pistons. The GTiR has a CR of 8.3:1 becuase of the quench area in the head! ***Luis, I have heard that the GTi-R combustion chambers have less quench area than the SR20DE, thus the lower CR, right? Why would the GTi-R have less quench area? It seems that this would lead to pinging more easily than the SR20DE head. I cannot think of a good reason to sacrifice quench area, can you? TurbochargedSER 12-10-2001, 07:04 PM Originally posted by v8killer2001 The Bluebird DET and GTiR DET use the same pistons. The GTiR has a CR of 8.3:1 becuase of the quench area in the head! ***Luis, I have heard that the GTi-R combustion chambers have less quench area than the SR20DE, thus the lower CR, right? Why would the GTi-R have less quench area? It seems that this would lead to pinging more easily than the SR20DE head. I cannot think of a good reason to sacrifice quench area, can you? The GTiR has *MORE* quench area than the Bluebird. That is why if you mill the head you have less quench area and the CR goes up! More quench area = more volume of air within the cylinder! v8killer2001 12-10-2001, 08:21 PM The GTiR has *MORE* quench area than the Bluebird. That is why if you mill the head you have less quench area and the CR goes up! More quench area = more volume of air within the cylinder! ***I was speaking with Mike K. a while back about headwork on a GTi-R motor and he said one area to concentrate on with the Pulsar head is the quench area. It does not have as much quench area as the SR20DE and Bluebird motors. Having more quench area means that you have more material in the combustion chamber, which means that you have a smaller volume. So, if a GTi-R head has less quench area, it has less material in the combustion chamber, and hence a lower compression ratio. When you mill a head, your CR goes up mainly because you are decreasing the volume of the combustion chamber, which is in the denominator of the CR formula. Is this right ot am I getting it backwards? | ||
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