evergreenZ Posted October 26, 2008 Share Posted October 26, 2008 What is the normal compression for a 1977 280z? I did my test yesterday and this was my results... Cylinder 1 - 155 Cylinder 2 - 160 Cylinder 3 - 160 Cylinder 4 - 145 Cylinder 5 - 150 Cylinder 6 - 155 Thanks Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted October 26, 2008 Share Posted October 26, 2008 Not bad for an NA motor, how many miles on the motor? I average 130 on a turbo motor freshly rebuilt with new rings and other parts. HB280ZT Quote Link to comment Share on other sites More sharing options...
evergreenZ Posted October 26, 2008 Author Share Posted October 26, 2008 I dont know. I just bought the car and I am having trouble getting it started. Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted October 26, 2008 Share Posted October 26, 2008 I do not think compression is your problem. Do you have spark, fuel and check timing? That is where I would start first. HB280ZT Quote Link to comment Share on other sites More sharing options...
Careless Posted October 26, 2008 Share Posted October 26, 2008 well it's not your compression, that's for sure. those are excellent results for a 31 year old car. Quote Link to comment Share on other sites More sharing options...
evergreenZ Posted October 26, 2008 Author Share Posted October 26, 2008 I have checked the compression, fuel, and spark and all seem do be functioning properly. I am getting to plugs today to see if that makes a difference. The plugs I took out were no good so that might be the problem. As for timing were is a good place to start? Quote Link to comment Share on other sites More sharing options...
evergreenZ Posted October 27, 2008 Author Share Posted October 27, 2008 Well I found that normal compression is 164 - 178. Also I put new plugs in it but heres the thing...I found that the spark plug wire were on the incorrect cylinders so my firing order was way off. Also somebody put an exhaust cutout on but instead of letting the exhaust cutout of the system it actually was more like an exhaust shut off. It blocked all flow off the header. This was closed when I found it. I corrected the firing order, put new plugs in, and removed the cutout and it fired right up. Now it hesitates a little when you first give it gas both when in neutral and driving down the road. I have checked for vaccum leaks and couldnt find any. Does anybody have anyother suggestions? It has a manual transmission if that helps. Quote Link to comment Share on other sites More sharing options...
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