HondaH22a#1

Ok so i have a couple problems wrong with my car & i could really use some help trying to figure out what it is, first off all the car is stock sleeve 9.5:1 compression b18c1. The car was tuned last month and made 508 @ 28lbs on c16. After the tune 4th gear was getting some type of boost cut so i decided to try & mess with the hondata one day. I didnt fix the problem but i noticed the car started smoking tons of white smoke so i came to the conclusion the headgasket was blown, Changed out the headgasket started it up & no smoke. Drove the car around & it started blowin white smoke again, did a compression test it came out to 120 150 150 120 which makes no sense to me, then car started missfiring pulled out the spark plug in each one & #4 was dead but it is getting spark, any type of help or advice would be apreciated

green91

Probably have a crack in the head or sleeve.

HondaH22a#1

Would there be any possible way to check for that without having to rip the motor apart again or is that the only option?

Turbo-LS

iTrader: (4)

Sounds like a cracked sleeve or warped head and or block surface. Doesnt sound like you were getting boost cut sounds more like it was detonating which is why it was misfiring to begin with. At that power level it doesnt take much to push the stock sleeves over the edge

HondaH22a#1

Thats exactly what i was thinking at first but this morning i went to start up the car & cylinder 4 was working as normal like this car has a mind of its own smh. Would a leak down test tell me anything i dont know as far as the internals?

4cylfiend

iTrader: (1)

Yes a leak down test and compression test will tell you something.

HondaH22a#1

Did a compression test yesterday & it was 120 150 150 120 which doesnt make too much sense to me

BEfab

Yeah you diffidently have some problems there. Did you inspect the sleeves when you had the head off? Also you should have gotten the head pressure checked before you put it back on, it would have eliminated that as being a possibility.

Regardless CYL 1 & 4 need to be investigated.

HondaH22a#1

Yea i did inspect the sleevea when the head was off & everything looked normal except for cylinder 4 piston looked like it was brand new as in no black residue on it like the other 3 pistons had, also i forgot to add that i do have a blockgaurd. But no i didnt get to get the head pressure checked because my machineshop guy has been away for 2 weeks FML

funhouse75

Rotate #4 to TDC. lock the crank by using whatever means to keep it from rotating. pull the plug, install adapter, you can use parts from your leak down tester and hook to shop air. remove your radiator cap. slowly apply air the cylinder and watch for bubbles. remove oil dip stick and listen and feel for air, remove your intake tube from your TB and open the plate and listen and feel for air. at TDC all your valves should be closed and your on the power stroke. so not much should be escaping. You will naturally have some air going by the rings because they have a gap(blow by) but not that much. You definitely have a leak, just need to figure if its the head or the block. most likely the head. also check the warpage on the head.

HondaH22a#1

So when i do that test & i find alot of air escaping from somewhere that would mean my valves are not sealing or there is some type of leak in the head correct?

pcguy760

If its the head - do you mean it's warped or a valve leak? Just wondering cos his title says No.4 Cyl is dead... btw thats some low compression for 9.5:1 - did you do it with the TB wide open (obviously ignition disconnected)?

HondaH22a#1

When i did the compression test i didnt have the throttle body wide open, i actually didnt know it made a difference. But i guess it wouldnt hurt to try

pcguy760

Yeah I forgot a few times myself lol and it does make you get lower numbers - I used this link here :

http://www.superhonda.com/forum/f55/...n-test-124194/

Turbo-LS

iTrader: (4)

the compression numbers are off for sure. being he two outter cylinders are lower id say a warped head or the headstuds threds in the block are pulling out OR possibly a partially clogged injector in cylinder 4 but that doesnt explain the low comp numbers

HondaH22a#1

Thats exactly what i was thinking, the compression and clyinder 4 not firing just doesnt make sense to me

funhouse75

Try this also. remove your cam, leave the piston at TDC and keep the engine from rotating. Best with 2 people, slowly add shop air to the cylinder and see what happens. What this test does is eliminate the cam or cams from the equation. If your getting air from the TB. most likely you have a bent valve or valve not seating due to misalignment. Remember you have to have compression for the fuel to ignite. No compression, no fire.
If all else fail. If you have a known working head, swap them and do the compression test again.

hon2984

you have already figure out that you have a problem with #4. with 120psi on #1 I would say you have a problem there too. what does the spark plug inspection tell you? I would re compression test all the cylinders and go from there. you are going to need to do a cylinder leakdown test on #4, but I would do # 1 as well. Isolate the problem to the head or the block and go from there. It is possible to get the head gasket on backwards, seen it done before...If you remove the head try to keep the gasket on the block so you can double check to make sure it was installed correctly. good luck!