blackEXcoupe

Hey guys I just did a leakdown test on my b16, its smoking like crazy. Cyl. No1 at TDC had no pressure leaking other than a slight hiss from the dipstick hole. I brought Cyl. No 2 up to TDC and had a significant amount of air coming out the throttle body, so I continued to turn the crank expecting the air to stop coming from the throttle body but it never stopped. Does this mean my intake valve seals are done? Are there any other tests I can do?

pr0honda

No, its something else leaking to get to the TB. Read the instructions. Dip stick tube leaking means rings, it's in the book.

Julio@Bisimoto

If you are hearing a significant leak through your in throttle body while in TDC you will either have a bent valve, major carbon deposit on valve/seat or a severely tight valve lash that is causing the intake valve to hang open. However none of these reasons will result in engine oil burning.

You may have an issue with valve seals/valve guide which best way to determine would be removing your intake and exhaust manifold followed by visually inspecting. You should see oil on the stem and back side of the valves.

Another cause can be worn our cylinder walls/Oil control rings of the pistons which would also require tear down and inspection if the issue was not the cylinder head alone.

Just for your information for leak down test:
Leak through throttle body = issues with intake valves
Leak through exhaust system = issues with exhaust valves
Leak through dip stick = issues with compression rings on piston
Leak through radiator (air bubbles when cap is open) = bad head gasket or crack in block/head

blackEXcoupe

Man that is some good info. I'm going back out there today to check if I missed something

blackEXcoupe

I re-did the leak down test making sure all pistons were at TDC. There's no air coming from the throttle body, there is a slight hiss coming from my dipstick and oil cap so it must be my rings.

blackEXcoupe

I found a complete GSR block with low miles for $500, how safe would it be to mill my b16 head .015 and use a spoon 2-ply headgasket to bump my compression up? Would I have a piston to valve clearance issue doing that?

shiroitenshi

saw your previous post. 150psi per cyclinder is low, but then again, I'm not sure if that's the regular for B16A with the USDM pistons. My old b16A is generating about 205-210 per cyclinder. on the stock setup.

GSR block is lower comp, so doing that may bring up your compression to type R levels. Clearance, I'm not sure, but most people don't have issues using the GSR/B16A head combo in terms of clearance.

blackEXcoupe

Well that's good to know, clearance is my biggest concern. I got 150 psi across all 4 doing only 3 pumps. I have no idea how high it would have gone if I tried 5 or 6 pumps. It may have gone to 205-210 per cylinder like yours.

shiroitenshi

Lol, no, I cranked the starter to measure. Most I could pushed was 205-210 no matter now many times I did it. When rings were shot, no matter how many times I cranked, it never touched 200. I was referring to your previous where you did a comp test, not a leakdown.