wunfstgsr

I was on the freeway and revved the motor up from 4th to 5th to about 7500 rpm maybe and i heard a boom a flame shot out my ex and actually lit my bumper on fire. Im tuned for 6psi but i upgraded the pulley so it boosted about 9psi. didnt see it go lean if anything it ran a bit rich. I pulled over and noticed my bumper caught flame for a few secs. The motor ran sluggish and extremely rich on my way home with little to no throttle response.

I went home and the next day checked the timing and it skipped teeth and was off. I had a piece of a a.c belt wrapped around the water pump assembly, apparently the weak before when i ripped my supercharger belt because it had a broken bolt that held the s.c brace, pieces of it flew in my timing belt area because I have the timing cover removed, and it did something to the timing belt that night almost a weak later causing it to possibly skip..

I reset the belt and it starts up and drives almost normal but it feel a power loss and i can hear it sounds kinda like a wrx or the ex is deaper. I did a compression test and i found one cylinder to be at 100psi and the rest were at 200psi. not sure if we did it right cause the motor was cold or not at full temp and im not sure if i held the throttle at wot i just pumped the throtle 5 times to wot. put some oil and no real change in comp.

Is it possible i blew a piston ringland or piston? I suspect the valves to be bent on that cylinder but what the chances the bottom end suffered any damage? the fact i over boosted a bit makes me fear the bottom end has damage but i have been boosting up to 9psi for a weak or so with no issues, i know its not smart to do that not fully tuned. but it seems the bigger issue was caused from the timing belt skipping not over boosting. Any help apreaciated.

backround on motor,

b18c-5 70k
bisi cam gears
Skunk 2 tunner 1 cams
Skunk 2 Alpha series valve springs
Skunk 2 Titanium retainers
Skunk 2 pro series manifold ported 70mm
Skunk 2 70mm Alpha throtle body with coolant bypass
Skunk 2 fuel rail
Skunk 2 vtec solinoid
Skunk 2 Alpha header
Skunk 2 mega r 2.5'' cat back
Ed Hanson custom made 2.5'' test pipe
Injen 3'' cold air intake arm
AEM EMS V2*
AEM fail safe boost gauge*
rc 550cc injectors
ATI pro charger super charger 12-15 psi boost pulley
Pro charger "big red" race surge valve.
front mount intercooler with 2.4'' charge pipes
out law engineering thermal spacer kit
70mm throtle body velocity spacer

Spawne32

iTrader: (3)

first things first...


get that in your arsenal of tools asap.

Next, i wouldnt be surprised if it was just a bent valve, its hard to say though, because you actually do have compression. If the valve was bent where it wouldnt close all the way, i would imagine it would have almost zero compression.

wunfstgsr

Thanks. I had my timing belt snap on a fully built gsr i had many years ago turned out to have all ex valves bent but thats all! so i hope i have just 2 bent ex valves but im keeping my fingers crossed. Havent done a proper leak done yet but i did hook up a old school leak down tester but had the vc off and i heard the air escaping the head so dont know what that would mean but thats all the testing i did. I didnt check the tail pipe or throtle or radiator. There is a bit of smoke coming out the breather nipple on my valve cover. There was a bunch coming out when it was running with the timing off, but once i set the belt correct the nipple only smikes very little but its there!

Spawne32

iTrader: (3)

maybe you cracked a ring land with tip in detonation on the shift?

wunfstgsr

hope not.. was a brand new block not too long ago! cant afford a rebuild.

DirtyDA9

Holy ****, that would suck so bad since its a brand new motor from honda.

B and B

iTrader: (3)

aaaaaannnnndddd

Spawne32

iTrader: (3)

wait this is an oem motor new from honda? putting money on ring lands.

93h2beg

do the leak down test. you can buy a cheap one at your local harbor freight. it will tell you where your leaking air in that low compression cylinder!

If u hear it out of the intake its intake valves, if u hear it coming out of the exhaust its those valves, if it blows out of your pcv its rings or piston.

OneBadTurboCRV

Let this be a lesson to you, always run timing covers as they are there for a reason.

Back to basic diagnostics... It is just as important to know HOW the gauge got to 100psi as it is to know the final number of 100psi. Was it equal jumps? One big jump with a couple blips? If the numbers didn't change with oil one could ASSUME potential for bottom end ring problems to be unlikely. (No, I am not basing that assumption off of normal practices, but rather experience.)

A bent valve to a point will still hold compression, but it also wouldn't make sense why it would only be one cylinder with a timing belt skip. A chip or crack in a piston could be culprit as well. Just for fun, you could pull all the plugs and put the piston about 1/4 to 1/2 way down the bore and shine a light on it. See if you can see any physical damage to the top of it. You will be able to view more than you think this way. Another way to check for bent valves is to pull the valve cover and see if one (or more) are sitting lower than the others while seated.

All of this could have been done/would have been easier when you initially pulled the cover to set the timing (at least I hope you did it that way).

Another thing... WEEK = measure of time

sirtef9

iTrader: (4)

haha, there is a reason for those covers, hopefully lesson learned.

th3pwn3r

Yeah, the reason is that Honda didn't want the engine bays looking too cool.

turbohatch96y7

iTrader: (15)

Sucks to hear man.
I would say bent valve, but every time i bent a valve it was always in more than one cylinder and more than 1 valve.

Take the manifolds off before pulling off the head and shine some light in that cylnder through the spark plughole.

Best best best scenario is your valve lash is super tight.

OneBadTurboCRV

Pulling manifolds especially on his setup is too much work; especially when there are other alternatives that are MUCH better.

DirtyDA9

^^ it has to come off either way cause the head will probably be coming off.

Who the hell in there right mind would go "whatever, ill just fix the timing ang go."

wunfstgsr

thanks guys, well i already started to pull the head so ill see from there. Hoping its just my head..

OneBadTurboCRV

Why in the world would you just pull it apart before doing baseline tests and getting solid numbers for reference? Your inexperience is showing... well actually, I guess it was already screamed at everyone by your initial problem that started this mess.

wunfstgsr

iv built many of these motors so im no noob to the B series! I just wanted some insight on peoples experience and or advise, dont need people like you telling me i dont know what im doing! iv built this setup from the ground up!

https://honda-tech.com/forums/forced-induction-16/anyone-ati-pro-charger-b-series-chime-2942111/

Dont matter now, i did enough baseline testing to know theres a issue with that cylinder, if my machine shop dont find any bent valves ect. i will look into the piston on that cylinder obviously. The motor will come appart regardless at this point. i ripped a belt before and all i had to deal with was bent ex valves so hopefully im in the same boat.

I disassembled the head before i had to go to work today so when im off ill wait for my room mate to help me lift the head off cause im a weak *** lol. Ill report on what i find soon.

turbohatch96y7

iTrader: (15)

I think onebadturbocrv is actually nevasatisfied in disguise lol...

or neva died and this is his long lost seed seeking vengeance.

h22-eg-hatch

iTrader: (1)

Sounds like a bent valve to me...

Something similar happened to me on my turbo prelude on the DYNO a while ago
My cam gears slipped caused a vicious pop on the DYNO. Then car sounded like a WRX lol
Compression was off on 2 cyls. It was bent exhaust valves
Sux taking off the head. But o well. Gotta do what u gotta do

wunfstgsr

yup its not as much pain as dealing with the bottom end but owell.

So i took a look at the valves, My intake valves and chamber looked brand new still lol, filled #3 ex chamber with brake fluid and low and behold i got a leak on both ex valves, all other valves were sealed and had no leakage. I dropped the head off at my Machine shop and my buddy Noel had 2 stock ex valves laying around so hes gonna go through the head and knock it out for me.

dcmatt

iTrader: (7)

Lmfao!!!!!

DirtyDA9

You obviousy have no idea who he is. Definately not a noob by any means.

wunfstgsr