trouble shoot sr20det no compression

[porkfriedrice]

red top s13 with no compression. head gasket was blown but car ran before. 1 cam broke after removing head other had stress fractures so got new cams from a black top s13 (i was told) and new steel headgasket. head was taken to shop and is straight and block was straight edged, head torqued to spec. now it has 0 compression on all 4 cyl. could it be the cams? what difference is there with blacktop cams? need help thanks.

[nismoman]

hmm weird, is the timing chain on correctly allowing the valves to close completely?

[Sileighty_85]

Mechanical timing is probably set incorrectly,

[codyace]

Check your valvetrain. If you broke a cam you could have damaged a valve, which would lead to 0 compression.

Also check mechanical timign as described above.


0 Compression is obviously a huge air leak. Even a bad headgasket will show some compression.

[porkfriedrice]

double checked timing chain is correct. Head was checked by machine shop and cams did not break until they were removed so no valves are messed up. it is all 4 cyl that have no compression.

[codyace]

Again, to have zero (and pure zero) compression in a cylinder you need something drastically wrong with the engine.

Valve train
Valves

I can't see a 'fresh' block and 'new' headgasket ever giving zero. Heck even on motors that have known bad HG's, they are simply low...not ever zero.

[eklips3]

try another compression tester.

i would say mechanical timing as well though

[nismoman]

Can you feel or hear air rushing out of the plug holes when you turn it over?

[japslapsilvia]

just do a leak down test to determine where n why you have zero compression.