in my ef i have a b18c1 stock block with b16 head stock also. I did a compression test and i was jus wondering what you guys think of the results,

With throttle closed (forgot to open it) i got
no 1 cyl 190
2 cyl 165
3 cyl 185
4 cyl 185

with throttle open i got
1 cyl 140
2 cyl 150
3 cyl 195
4 cyl 160
I know you suppsed to do the test with throttle open but i forgot so theres the results with it open and closed. What you guys think.

 

i know a stock gsr motor should be pulling at least 225, i dont think the b16 head should change the compression (but i could be wrong), but the car should be warmed up when doing these tests, did you warm it up?

 

the car should be warmed but its dangerous cuz u might strip the head taking the spark plugs out, anyway i don't think ur valves are bent because the compression would be lower but they may need adjustment.

 

I agree with dude above me.

 

Yes I did do the test with the car fullwarmed up. Also I adjusted the valves about 2 months ago but ill check them again. Also does anybody know how much air to apply to each cylinder on a leakdown test for this motor?

 

no more then 90 psi i believe, or something around that...but your starting leakage reading should be 0 regardless of however much air your putting in, also did you try a wet compression test to check the piston rings?

 

I didnt try the wet compression test im going to do it tomorow morning along with the leakdown. Im using a homemade leakdown tester btw that i made. Hopefully i dont blow up the motor.

 

hey guys i did a compression test too on my 2000 si its a b16 motor and im pretty much ready to say that the car is barley hanging on to life.its a rebuilt title sooo the mileage on the car my seem incorrect i bought the car at 95k and its at 105k
the numbers are.
1 cyl 180
2 cyl 150
3 cyl 175
4 cyl 135
can u guys help me out i dont know wat could be wrong...

 

Not sure if this helps, but I recently did a comp test on my JDM B18C and got the following results:
1-225, 2-230, 3-230, 4-230
I was told this was a very healthy motor by the shop.
Leakdown test was 98% sealed.

 

ya i know my numbers are tooo low i may need a new block...or a motor rebuild

 

with the b16 head on a stock gsr block, compression should drop 0.2 so it should be at 9.8:1. do the cylinder leak down test wet & dry as it'll tell you which internal part is causing the lower compression IE piston rings, intake valves, exhuast valves, bad headgasket\warped head

 

your in the same boat as me

 

Isnt us gsr compression ratio 10.6:1?

 

10.1 i believe

 

well i guess the leak down test should be able to let me know wat else can be wrong with the block... even tho im not leaking anywhere...i burn oil fast tho...