Did I bend any valves?

[ziggo0]

Accidentally timed the intake cam off by 180 deg, didn't crank for more than 5 ~ 10 seconds before I realized what I had done. Pulled it back apart, timed it correctly this time and it runs fine...what could've happened or gone wrong?

 

[1gDSM4g63]

Do a compression check and if that checks out fine then on to a leak down test.

 

[LiquidX]

I would just go and do a leak down test to see if you did infact do any damage. If you timed it 180 out, it almost sound like you just had it timed with the exhaust valves so they would have been fine apparently. Did you hear any bad noises? But deffinatly do the leak down test to be sure.

 

[ziggo0]

I've been hearing random noises that don't sound good...did a compression test on 1 & 2, so far 120ish.....................fresh rebuild, new rings, pistons etc........idle is very rough now, I think I bent them

 

[92AWDHX40]

Chances you did, i would doubt few are ok, do a compression tests if it wont start there you go bent valves.

 

[ziggo0]

It starts and runs great to be honest...even boosts like a champ. Maybe they are only slightly bent?

 

[twicks69]

Still....pull the head and replace the bent valves....Come on now. You know you screwed up, just pull the head again, and check it if you aren't going to do a leak-down.

The damage has already been done, since you have been cranking the engine, and running it.... Do a leak-down per cylinder to check for intake or exhaust leakage, or pull the head and replace the valves that are bent or tweeked.

 

[ziggo0]

It's already parked in the garage and in the process of getting the head off. Had to go get mom's car for transportation haha. What's funny is I got 2 spare heads with the car, both with all bent intake valves

I guess this would be a bumpdate. No bent valves, all water tight except for one slight dribble on one valve from the exhaust side, didn't compression test that cylinder. I noticed in cyl 4 that the wall had a nice scrape on it, finger nail doesn't get caught in it but you can definitely feel it there. Perhaps I compression tested it wrong?

 

[rhodess89]

on a compression test, disable the fuel and ignition and have it at WOT so that you can still suck air in the engine to its best ability, you should crank each cylinder 4 puffs, you will here it and see the gauge jump, by the second puff you should have already built up over half the psi that cylinder is going to make now you have think that the compression rings on only seal tight when its actually running so about 20% of those puffs are being wasted by blowby so your compression will be a bit higher when the car is running and you must have atleast 90psi in a cyclinder for it to actually contribute and for the leak down test, when you do that closed the throttle back and your air in the there should like a i said only be about 20% of waste because of the rings, make sure that your at tdc on the compression stroke on the cyclinder your doing, heres a trick to finding out the problem is after your air is being pumped in while its being pumped in your gauge should tell you if you have an escessive leak but open the oil fill cap and lsiten for hissing, listen it at your exhaust tip and listen for it through your intake you may have to take it apart to listen to that part of it and you ever see bubble where your coolant fill cap goes, blow head gasket. hear it in the intake intake vavles, exhaust, the exhaust valves, oil fill which should sound like its whooshing throught it that would be rings. now some will be coming from the oil fill that thats where your 20% loss it so you will hear a little but if they are bad you will know.