Long story short my car stopped running right. Took it to a shop and 40 dollars later I find out I have no compression on cylinder #2. Me and a few of my car techie friend have come to the conclusiobn its probably a valve spring or something of that nature.
My question is where do I get some upgraded valve springs and valves? I saw on J-body performance, and liked what I saw (both product and price). Just curious if there are any other sites out there that have em? Oh a thicker headgasket too!
does karo include valvesprings with the valves he sells? if not, i'd go with JBP.
I was a retard, and now I'm permanently banned.
How did it happen?
Nate
Evolution of Cavyboy-->C22t--> C24na--->c24s/c
1995 Cavalier W/2k1 Engine
GM S/C 13.940@99.78pmh w/2.068 60ft
if a valve spring broke , youll have alot of damage to the piston and head from the valve dropping
When I had my civic the same thing sorta happened... no piston damage though.
How did it happen? Not sure. Car was runnin mint on friday. Saturday I noticed a noise coming from my car. Almost sounded like an exhaust leak but then I realized it was coming from the motor. Car still ran fine though. Saturday night Im driving and all of a sudden my car loses all power and the CEL starts flashing. Ill let everyone know what happens
Its much more likely to be the bottom end - piston rings, rod, etc. The 2.4L top end is pretty strong, you'd have to push a lot of boost through it to break something up top - and it would take far less boos then that to destroy the bottom end.
"Only two things are infinite, the universe and human stupidity, and I'm not sure about
the former." - Albert Einstein
Dave wrote:Its much more likely to be the bottom end - piston rings, rod, etc. The 2.4L top end is pretty strong, you'd have to push a lot of boost through it to break something up top - and it would take far less boos then that to destroy the bottom end.
I would agree that it is unlikely you dropped a valve, or broke a valve spring. Might of broke a ring gland. I would try putting oil in that cly and doing another compression check and see if it changes.
FU Tuning
keep us updated.
i have a feeling the head is fine.
(from boosted motors getting blown up that i seen over the years)
Hey BlackZ2401, check your e-mail!
Karo (Car Customs) wrote:Spotabee Racing wrote:does karo include valvesprings with the valves he sells? if not, i'd go with JBP.
He sure does not. Sorry.
only rappers and basketball stars can speak in 3rd person... and you are neither karo. you're just one badass parts guy with a fast sunfire. that's almost better!
I was a retard, and now I'm permanently banned.
either way your taking the head off, so go find out whats wrong!
but if you weren't playing to hard on the motor and it was running fine until you shut it down, sounds more like a spun rod bearing
________________________________________________
...bone stock
How is compression in other cylenders? If it's the head gasket, many times you will loose compression in a neighboring cylender or burn coolant.
If it is a piston ring, you will loose compression slower and burn oil. If it is in the valvetrain, which I doubt it is, if I remember right the valve will drop so you will never even really gain much compression, it just goes right out, but our engines are very interference so you probly broke a lot of stuff if that is the case. lots of racket.
My money is on the lower end. Mainly because thats where my problem was. It sounded like my knock was in the top end, and I had a loss of compression (not total though) but it turned out my bottom end was owned.
good luck
22 miles per gallon and dropping fast...
In my other Z24 (which was also a 2001 but it got totaled)... i had the same problem. Car drove the same way. Turned out to be something in the head. Either way Im going to find out today when the head comes off.
Ok lets clear up a few things here. The Cams are out and it was as I thought a valvetrain problem. NOT a head or bottom end problem. If it was a head gasket the compression would be similar in the adjacent cylinder. Example 150 psi/75psi/75psi/150psi, Notice the drop betwwen the 2/3 cylinders. Also he would be blowing clouds of white smoke typically due to the burning of coolant. If he broke a ring land or blew a hole in the piston there would be a large quantity of metal fragments in the oil, which there wasnt.
What did break was a lifter, shattered actually. The broken pieces of the lifter were contained by the spring, saving the bottom end. But what did occur was the fragmented pieces caused the valve locks to seperate from the retainer. When we pulled the girdle the spring popped right off. Also the exhaust cam and girdle got damaged from the broken lifter. Replacement parts, plus some extras, are on order.
So what did we learn, the 2.4 Head is strong yes, but the valvetrain is the weak link in it. Its hard to break an Iron head, it doesnt crack to easy. But when you blow the @!#$ out of a lifter it might do some damage
Pictures will be posted tomarrow night by the Black.
2002 Z28: Slp coldair Pac, Corsa Catback, 3200 stall
simialr thing happened to my friends Z24 , but his was cause by over rev , and each of the exhaust valves smacked the pistons , and put lips in the pistons , and it shattered the lifters 1 cam apart completely , and there was debris in the oil pan from it
Yeah over reving can do that. How he did it is yet to be desided cause I have never seen him bounce off the rev limiter, thats got me puzzled???????
2002 Z28: Slp coldair Pac, Corsa Catback, 3200 stall
All Quad heads are alum.
was it just a bad lifter, ive always heard rumers on how the LD-9 starves for oil on the top end at high RPM,
one of the reasions i use M-1 15W-50 to try to keep my oil film thicker,
sucks man.. good luck on the rebuild, and get some LD-2 cams now that its apart.
Chris
'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08
the oil pump should be replaced i beleive the oil pump out of a w41 is more powerful and able to circulate better
IF IT WERE ONLY THAT EASY.
Chris
'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08
fats02z28 wrote:Ok lets clear up a few things here. The Cams are out and it was as I thought a valvetrain problem. NOT a head or bottom end problem. If it was a head gasket the compression would be similar in the adjacent cylinder. Example 150 psi/75psi/75psi/150psi, Notice the drop betwwen the 2/3 cylinders. Also he would be blowing clouds of white smoke typically due to the burning of coolant. If he broke a ring land or blew a hole in the piston there would be a large quantity of metal fragments in the oil, which there wasnt.
What did break was a lifter, shattered actually. The broken pieces of the lifter were contained by the spring, saving the bottom end. But what did occur was the fragmented pieces caused the valve locks to seperate from the retainer. When we pulled the girdle the spring popped right off. Also the exhaust cam and girdle got damaged from the broken lifter. Replacement parts, plus some extras, are on order.
So what did we learn, the 2.4 Head is strong yes, but the valvetrain is the weak link in it. Its hard to break an Iron head, it doesnt crack to easy. But when you blow the @!#$ out of a lifter it might do some damage
Pictures will be posted tomarrow night by the Black.
Well glad it is not a bottem end issue. I know I was giving info off what I have seen or heard of. It is not common on these motor to have top end issue's like that.
Oh yes the head on a J is Alum, not Iron.
FU Tuning
Taetsch Z24 wrote:IF IT WERE ONLY THAT EASY.
Chris
Don't you love people who post something they know nothing about?
Also as to running 15W-50, how's that working out? You got me thinking now.
great, i started useing it becaue of warn valve guides, but GM also recomends it on boosted motors and raceing aplacations, i fall under both.
the oil also dosent seem to get dirty as fast. im happy with it. i also dont have any notesable valve train wear.. ( yet )
im a strong bleaver in M-1, we tested it in all sorts of vehicals at my dads shop, my old blazor, 1984 4X4 2.8 ( carbed ) has 290 on it, still going strong. we also used that car for testing compertors oils in it, we tryed slick 50 when that was all the rage in the 90's, it fryed the oil pump, my mom shut it off right when she saw the pressher gauge drop, when we sent it out to get rebuilt the shop we sent it to thought we were trying to catch them in a set up, thay said that the other than needing a pump the motor only had no more than 15K on it, at the time it had 160K.
so, speaking for myself. love my mobal-1..
lol im weard.
Chris
'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08
