OT Engine help (non bmw)

[equate975]

Yeah I would have figured it was timing at first. But he swore and swore it was right and showed me the marks and it all looked good. Then we pulled the valve cover and did a leakdown on cyl 1 at TDC to see if it was indeed on the compression stroke. Oh guess the valves were 1/2 open lol ;)


On a side note, I almost want an American car right now. Buddy of mine finally fired up his chevy 355 that he has a retarded amount of money into & straight pipes. God damn that thing was MEAN sounding. Shook the entire shop and I'm pretty sure there was no place in there anyone could carry on a conversation. That thing was badass, I still make fun of him for his lack of fuel injectors and keep asking what that round thing with all the spark plug wires on it is for lol ;) Oh and where is the computer that controls the engine? haha

[OrganicMechanic]

called it!!

good luck on the fire up-- you may want to degree your cams and see if that helps

[equate975]

Well, dirka dirka the timing wasn't right after all. Took us about 4 hours to square that up but its still a no-go and we have no idea.

I think the problem is, is that he has really loppy cams in it now, tons of overlap. We had to advance the exhaust almost 10 degrees just to get it spot on. Intake I think we retarded 5 deg. Compression is good now, leakdown was perfect. Except it won't fire still.

Sounds better like it wants to go, but it won't. Flushed the gas and put in fresh stuff, we still have fuel, still have spark, and now we have good compression.

My only idea is that the spark timing is off, but theres no way to change it.

Might be 180 deg off now, thats the last idea. The engine used to be non-interference but with all the work that was done to it, its interference now. The shitty thing is you CAN'T access the timing belt/tensioner with the engine in the car, its not possible. The only way we could get the cams set was with the adjustable gears he put on.

[eurohick.]

thats gonna def have to come apart before anything. You either have bent or unseated valves, or piston ring issues, i go for the former since youre ruling out the bottom end to begin with.

[abepark]

180 degrees off? by the wierd sound like a timing belt snapped sounds like a timing issue, don't know if these are interference engines but I would be suspect to top end is mistimed. you probally would hear metal on metal if a ring broke, spray some starter fluid in the intake and see if it backfires.

[robspeed325i]

piston rings still in the box? =p

[e30esque]

Did the pistons get touched at all? Sounds like when I had a cracked ring.

[ethree]

neons.org much better at diagnosing neon problems. Good forum.

[DCColegrove]

My vote is for bent valves...

Just a guess...

Hope I'm wrong.

.

[OrganicMechanic]

I still go with timing off.

[allwheeldrive]

With funky compression numbers like that, the head is gonna have to come off anyways.

[SamE30e]

did he put the cam in after he bolted up the head? if so possible bent valves from not timing the cam before he installed, so when he did tighten the cam it pushed valves into pistons bending them enough to loose compression. good luck, id do a leakdown test then rip the head off.

Cam not installed properly?

[FLUTE007]

did he put the cam in after he bolted up the head? if so possible bent valves from not timing the cam before he installed, so when he did tighten the cam it pushed valves into pistons bending them enough to loose compression. good luck, id do a leakdown test then rip the head off.

[VacMan]

Rings? Head gasket? Valves not seating?

[equate975]

That has a MLS HG, correct? Possible that an alignment dowel is missing, causing the head to not sitting on correctly?

Yeah, I know for sure the dowels were in there because the machine shop that decked the block didn't put them back in.

I watched him put the head on, and nothing looked strange about it. Unless one of the layers shifted over or something, or the rivet that held them together came off for some reason.