What could I have done?
Thread Starter
Burning Brakes
Joined: Feb 2016
Posts: 914
Likes: 182
From: Reidsville North Carolina
What could I have done?
so had the engine kinda' built
heads, cam, headers, ect, the usual
had a zo6 diff with 373 gears installed
they told me to drive it normal for the first 500 miles
took it back friday for the dyno and tune, every thing great
did a burn out leaving the place (felt good)
drove home (125 miles) ran great
took it out this afternoon, filled it up with gas and did another burnout
not really a burnout, nailed it did a fish tail and let out
when I let off, I heard a noise kinda' like something hitting a fan blade
more than a tick but less than a knock
I pulled into a side road lifted the hood and the noise stopped
I drove it back home, let it sit for awhile and took it out again
it's not making the noise, runs fine but dosen't sound quite the same (might just be me being paranoid)
could I have screw something up? it runs fine with no problems, i'm afraid to nail it anytime soon
there's kind of a tick maybe but that was probably there before
what should i look for?
heads, cam, headers, ect, the usual
had a zo6 diff with 373 gears installed
they told me to drive it normal for the first 500 miles
took it back friday for the dyno and tune, every thing great
did a burn out leaving the place (felt good)
drove home (125 miles) ran great
took it out this afternoon, filled it up with gas and did another burnout
not really a burnout, nailed it did a fish tail and let out
when I let off, I heard a noise kinda' like something hitting a fan blade
more than a tick but less than a knock
I pulled into a side road lifted the hood and the noise stopped
I drove it back home, let it sit for awhile and took it out again
it's not making the noise, runs fine but dosen't sound quite the same (might just be me being paranoid)
could I have screw something up? it runs fine with no problems, i'm afraid to nail it anytime soon
there's kind of a tick maybe but that was probably there before
what should i look for?
Banned Scam/Spammer
Joined: May 2007
Posts: 15,685
Likes: 1,330
From: Machineguns, because I don’t compromise
High lift valve springs aren’t as forgiving as stock. If the springs weren’t up to full oil temp one could’ve cracked.
Last edited by ~Josh; Aug 29, 2020 at 08:15 PM.
Banned Scam/Spammer
Joined: May 2007
Posts: 15,685
Likes: 1,330
From: Machineguns, because I don’t compromise
Those are strong springs but brittle when not up to full temp compared to stock. The fact they are dual may have saved the engine if one indeed broke.
I once had the inner spring break on a hot LT1 back in the day. It wasn’t obvious at first when I pulled the valve covers, it wasn’t until later I found out when it was smoking because the broken inner spring cut the valve stem seal letting oil into the cylinder to be burned.
So you were on the gas, high rpm, perhaps a spring broke, couldn’t control the valve and you heard the result at that time. Now the valve is still operating as the dual spring combo is hanging in there.
As a person that’s literally rebuilt and changed everything on my c5 I can’t think of another item in the driveline that would break loose and cause a fluttering sound but then still operate without the sound later.
I once had the inner spring break on a hot LT1 back in the day. It wasn’t obvious at first when I pulled the valve covers, it wasn’t until later I found out when it was smoking because the broken inner spring cut the valve stem seal letting oil into the cylinder to be burned.
So you were on the gas, high rpm, perhaps a spring broke, couldn’t control the valve and you heard the result at that time. Now the valve is still operating as the dual spring combo is hanging in there.
As a person that’s literally rebuilt and changed everything on my c5 I can’t think of another item in the driveline that would break loose and cause a fluttering sound but then still operate without the sound later.
Last edited by ~Josh; Aug 29, 2020 at 09:44 PM.
Banned Scam/Spammer
Joined: May 2007
Posts: 15,685
Likes: 1,330
From: Machineguns, because I don’t compromise
No, you can miss the broken visually like I did on my LT1 as mentioned. It was an inner spring, not always obvious unless each spring is removed and looked at. Idle isn’t your issue, it’s higher when the compromised spring pack can’t control the valve.
If you aren’t a gearhead doing your own work, take it to a shop and have them change the valve springs, I’d bet they will find a broken inner or outer spring on a cylinder.
If it were me I’d leave the car parked until I changed the springs.
Especially they are new springs. Older seasoned springs would be less likely to go.
If you aren’t a gearhead doing your own work, take it to a shop and have them change the valve springs, I’d bet they will find a broken inner or outer spring on a cylinder.
If it were me I’d leave the car parked until I changed the springs.
Especially they are new springs. Older seasoned springs would be less likely to go.
Last edited by ~Josh; Aug 29, 2020 at 11:06 PM.
Banned Scam/Spammer
Joined: May 2007
Posts: 15,685
Likes: 1,330
From: Machineguns, because I don’t compromise
^if those springs were installed you’d expect harder pushrods were installed. Doubtful a shop would reuse stock pushrods unless incompetent.
I like stock pushrods with 918 style springs (like I have) but on those “lifter ruining” .660 springs it’s nuts to have stock pushrods.
I like stock pushrods with 918 style springs (like I have) but on those “lifter ruining” .660 springs it’s nuts to have stock pushrods.
Last edited by ~Josh; Aug 29, 2020 at 11:07 PM. Reason: Should be able to correct a typo
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Thread Starter
Burning Brakes
Joined: Feb 2016
Posts: 914
Likes: 182
From: Reidsville North Carolina
took her out for a little drive (about 10 miles)
runs fine, sounds fine
it just don't seem to be hitting as hard as it was
cam sounds great, has plenty of power
the engine just seems like it has calmed down (a lot smoother)
runs fine, sounds fine
it just don't seem to be hitting as hard as it was
cam sounds great, has plenty of power
the engine just seems like it has calmed down (a lot smoother)
Thread Starter
Burning Brakes
Joined: Feb 2016
Posts: 914
Likes: 182
From: Reidsville North Carolina
took the valve covers off, everything looks normal
I drove it Sunday, still runs fine, sounds good
Drove it Monday and some of the aggregation seems to be returning (still not back to where it was)
Talked to a guy today (he's a gearhead and mechanic)
He said what it sounded like to him (from what I told him)
was when I stood on it let off and stood on it again the oil went to the top
and that's when I heard the tinking noise, once it idled for a little bit
the oil had returned to normal and that's when the noise I heard stopped
he said it was probably a valve and to keep driving it (normal, no spinning tires)
and the valve should pump back up and the aggregation I was talking about should return
he did say that was just his opinion according to what I had told him and it was just a guess
it does seem to be coming back to what it was (only time will tell)
could he be right or in the ball park?
or was he just bull shitting me?
I drove it Sunday, still runs fine, sounds good
Drove it Monday and some of the aggregation seems to be returning (still not back to where it was)
Talked to a guy today (he's a gearhead and mechanic)
He said what it sounded like to him (from what I told him)
was when I stood on it let off and stood on it again the oil went to the top
and that's when I heard the tinking noise, once it idled for a little bit
the oil had returned to normal and that's when the noise I heard stopped
he said it was probably a valve and to keep driving it (normal, no spinning tires)
and the valve should pump back up and the aggregation I was talking about should return
he did say that was just his opinion according to what I had told him and it was just a guess
it does seem to be coming back to what it was (only time will tell)
could he be right or in the ball park?
or was he just bull shitting me?
Thread Starter
Burning Brakes
Joined: Feb 2016
Posts: 914
Likes: 182
From: Reidsville North Carolina
Highly pissed
This is where were at now
Took it out for a drive (no excessive anything/normal driving)
started doing this, now it won't start
had to have it towed home
guess i'll have all weekend to fume
then call the place that built it Tuesday
This is where were at now
Took it out for a drive (no excessive anything/normal driving)
started doing this, now it won't start
had to have it towed home
guess i'll have all weekend to fume
then call the place that built it Tuesday
Thread Starter
Burning Brakes
Joined: Feb 2016
Posts: 914
Likes: 182
From: Reidsville North Carolina
Le Mans Master
Joined: Oct 2008
Posts: 8,894
Likes: 981
From: Whitby Ont.
I wouldn t ream them out just yet.. need to find out the issue first, like previously mentioned, if the oil and springs were not up to operating temp, is hardly the shops fault. You will get better results from them if you start off nice, then if they start some bs, then you can rip them.
JMO
JMO