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Obligatory C5 Thread

Posted: Thu May 23, 2019 9:39 am
by Acid666
Could be that the condensor is a little loose or something and activating it pulls tension and tightens it all up? I dunno. Like you, I can't see how the two are related, especially if it's valve train noise.

Obligatory C5 Thread

Posted: Thu May 23, 2019 11:33 am
by ChrisoftheNorth
Acid666 wrote: Thu May 23, 2019 9:39 am Could be that the condensor is a little loose or something and activating it pulls tension and tightens it all up? I dunno. Like you, I can't see how the two are related, especially if it's valve train noise.
Well, I'm wondering if it's not actually valve train noise I'm hearing? Maybe it's some other put-put-put noise? From inside, it can almost sound like an exhaust leak. Is something loose/disconnected in the HVAC system that isn't an issue when the AC is on?

I'll check the condenser to see if maybe it's loose against the radiator...but the noise seems to be closer to the engine/rear of the engine.

Obligatory C5 Thread

Posted: Thu May 23, 2019 11:34 am
by ChrisoftheNorth
Or maybe I'm just a :derp: and it's all in my head. Could it be that the AC on is making white noise in the cabin that drowns out the valve train noise?

I'll be driving the car home with the top off tonight, I'll play with the ac on/off to see if there's actually a difference.

Obligatory C5 Thread

Posted: Thu May 23, 2019 11:54 am
by CaleDeRoo
That's honestly what I was going to say^

Obligatory C5 Thread

Posted: Thu May 23, 2019 1:04 pm
by Desertbreh
:popcorn:

Obligatory C5 Thread

Posted: Thu May 23, 2019 1:15 pm
by Purpc5z
Detroit wrote: Thu May 23, 2019 9:21 am Ok gents...a bit stumped on a new one here. This'll be some ADVANCED level C5 discussion...

Been driving my car more lately. Enjoying it a lot. Since doing my heads/cam, I've had noticeable valve train noise. "Sewing machine", "typewriter" are common descriptors. VERY common on these, tuners said it was normal, I just :aintcare: nature of the beast, whatever. It's mostly noticeable with the windows down, next to walls or other cars...but it can be detected inside with the windows up. Again, whatever.

So it got warm and humid overnight, and I decided to drive the car today. Flick the A/C on and as I'm driving notice how quiet the valve train is. Roll the window down, and indeed I swear it's quieter. I haven't driven much with the A/C on, this is the first time I drove a long period with it on.

I start racking my brain trying to figure out how the hell the two could be related, and I'm coming up with nothing. Is the extra load on the engine doing something? Is the noise not valvetrain and maybe something else?

Any thoughts from the best Corvette forum on the net?
From my understanding, the "sewing machine" valve train was only for LS7s. I've got a few buddys with HCI C5zs and they have some decently quite top ends. Nothing compared to LS7 ticking. It feel like ticking could be coming from somewhere else. Just my thoughts

Obligatory C5 Thread

Posted: Thu May 23, 2019 1:42 pm
by goIftdibrad
Detroit wrote: Thu May 23, 2019 9:21 am Ok gents...a bit stumped on a new one here. This'll be some ADVANCED level C5 discussion...

Been driving my car more lately. Enjoying it a lot. Since doing my heads/cam, I've had noticeable valve train noise. "Sewing machine", "typewriter" are common descriptors. VERY common on these, tuners said it was normal, I just :aintcare: nature of the beast, whatever. It's mostly noticeable with the windows down, next to walls or other cars...but it can be detected inside with the windows up. Again, whatever.

So it got warm and humid overnight, and I decided to drive the car today. Flick the A/C on and as I'm driving notice how quiet the valve train is. Roll the window down, and indeed I swear it's quieter. I haven't driven much with the A/C on, this is the first time I drove a long period with it on.

I start racking my brain trying to figure out how the hell the two could be related, and I'm coming up with nothing. Is the extra load on the engine doing something? Is the noise not valvetrain and maybe something else?

Any thoughts from the best Corvette forum on the net?
thats a hydraulic lifter engine right?

Obligatory C5 Thread

Posted: Thu May 23, 2019 1:48 pm
by ChrisoftheNorth
Purpc5z wrote: Thu May 23, 2019 1:15 pm
Detroit wrote: Thu May 23, 2019 9:21 am Ok gents...a bit stumped on a new one here. This'll be some ADVANCED level C5 discussion...

Been driving my car more lately. Enjoying it a lot. Since doing my heads/cam, I've had noticeable valve train noise. "Sewing machine", "typewriter" are common descriptors. VERY common on these, tuners said it was normal, I just :aintcare: nature of the beast, whatever. It's mostly noticeable with the windows down, next to walls or other cars...but it can be detected inside with the windows up. Again, whatever.

So it got warm and humid overnight, and I decided to drive the car today. Flick the A/C on and as I'm driving notice how quiet the valve train is. Roll the window down, and indeed I swear it's quieter. I haven't driven much with the A/C on, this is the first time I drove a long period with it on.

I start racking my brain trying to figure out how the hell the two could be related, and I'm coming up with nothing. Is the extra load on the engine doing something? Is the noise not valvetrain and maybe something else?

Any thoughts from the best Corvette forum on the net?
From my understanding, the "sewing machine" valve train was only for LS7s. I've got a few buddys with HCI C5zs and they have some decently quite top ends. Nothing compared to LS7 ticking. It feel like ticking could be coming from somewhere else. Just my thoughts
Nah, the sewing machine is well documented on all LS engines...especially cars with aggressive ramp rate cams. Mine isn't LOUD, but it's noticeable if you listen for it. I am starting to wonder if it's coming from somewhere else, just not sure where.

Obligatory C5 Thread

Posted: Thu May 23, 2019 1:48 pm
by ChrisoftheNorth
Big Brain Bradley wrote: Thu May 23, 2019 1:42 pm
Detroit wrote: Thu May 23, 2019 9:21 am Ok gents...a bit stumped on a new one here. This'll be some ADVANCED level C5 discussion...

Been driving my car more lately. Enjoying it a lot. Since doing my heads/cam, I've had noticeable valve train noise. "Sewing machine", "typewriter" are common descriptors. VERY common on these, tuners said it was normal, I just :aintcare: nature of the beast, whatever. It's mostly noticeable with the windows down, next to walls or other cars...but it can be detected inside with the windows up. Again, whatever.

So it got warm and humid overnight, and I decided to drive the car today. Flick the A/C on and as I'm driving notice how quiet the valve train is. Roll the window down, and indeed I swear it's quieter. I haven't driven much with the A/C on, this is the first time I drove a long period with it on.

I start racking my brain trying to figure out how the hell the two could be related, and I'm coming up with nothing. Is the extra load on the engine doing something? Is the noise not valvetrain and maybe something else?

Any thoughts from the best Corvette forum on the net?
thats a hydraulic lifter engine right?
:yesth:

But these things are known for a somewhat noisy valve train, especially with a cam like mine.

Obligatory C5 Thread

Posted: Thu May 23, 2019 2:03 pm
by goIftdibrad
Detroit wrote: Thu May 23, 2019 1:48 pm
Big Brain Bradley wrote: Thu May 23, 2019 1:42 pm

thats a hydraulic lifter engine right?
:yesth:

But these things are known for a somewhat noisy valve train, especially with a cam like mine.
I could see it being timing chain noise. with a bigger cam in-between power strokes the chain might be loosening and tightening under light load generating your noise. With that little bit of extra load this effect will be less.

Obligatory C5 Thread

Posted: Thu May 23, 2019 2:06 pm
by ChrisoftheNorth
Big Brain Bradley wrote: Thu May 23, 2019 2:03 pm
Detroit wrote: Thu May 23, 2019 1:48 pm
:yesth:

But these things are known for a somewhat noisy valve train, especially with a cam like mine.
I could see it being timing chain noise. with a bigger cam in-between power strokes the chain might be loosening and tightening under light load generating your noise. With that little bit of extra load this effect will be less.
This did occur to me. I should get a stethoscope to test.

Obligatory C5 Thread

Posted: Thu May 23, 2019 2:39 pm
by Acid666
You should ask Scotty Kilmer. He'll likely know the culprit

Obligatory C5 Thread

Posted: Thu May 23, 2019 2:45 pm
by ChrisoftheNorth
Acid666 wrote: Thu May 23, 2019 2:39 pm You should ask Scotty Kilmer. He'll likely know the culprit
Who dat?

Obligatory C5 Thread

Posted: Thu May 23, 2019 2:49 pm
by Acid666
Detroit wrote: Thu May 23, 2019 2:45 pm
Acid666 wrote: Thu May 23, 2019 2:39 pm You should ask Scotty Kilmer. He'll likely know the culprit
Who dat?
REV UP YOUR ENGINESSSSSSSSSSSSS!!!!!!!!!!
Image

Obligatory C5 Thread

Posted: Thu May 23, 2019 2:53 pm
by ChrisoftheNorth
Acid666 wrote: Thu May 23, 2019 2:49 pm
Detroit wrote: Thu May 23, 2019 2:45 pm
Who dat?
REV UP YOUR ENGINESSSSSSSSSSSSS!!!!!!!!!!
Image
:wtf:

Still no idea who dat is.

Obligatory C5 Thread

Posted: Fri May 24, 2019 12:32 pm
by ChrisoftheNorth
Well, to wrap this up, turns out I'm a :derp:

I forgot how loud the 2nd fan is that turns on with the A/C OR when the car gets hot. Car rarely gets hot, so it's not on often unless I'm running the A/C. It's a loud enough white noise that it masks the valvetrain noise.

Obligatory C5 Thread

Posted: Fri May 24, 2019 2:58 pm
by Desertbreh
Detroit wrote: Fri May 24, 2019 12:32 pm Well, to wrap this up, turns out I'm a :derp:

I forgot how loud the 2nd fan is that turns on with the A/C OR when the car gets hot. Car rarely gets hot, so it's not on often unless I'm running the A/C. It's a loud enough white noise that it masks the valvetrain noise.
Sending you a bill for the time I spent reading about your "advanced" C5 issue. Cash or cashiers check please.

Obligatory C5 Thread

Posted: Fri May 24, 2019 3:10 pm
by ChrisoftheNorth
Desertbreh wrote: Fri May 24, 2019 2:58 pm
Detroit wrote: Fri May 24, 2019 12:32 pm Well, to wrap this up, turns out I'm a :derp:

I forgot how loud the 2nd fan is that turns on with the A/C OR when the car gets hot. Car rarely gets hot, so it's not on often unless I'm running the A/C. It's a loud enough white noise that it masks the valvetrain noise.
Sending you a bill for the time I spent reading about your "advanced" C5 issue. Cash or cashiers check please.
Oh shit, that should actually take care of the bill I sent you about the ridiculousness of your wheel saga on the :tits: mobile.

Obligatory C5 Thread

Posted: Fri May 24, 2019 5:02 pm
by Irish
Detroit wrote: Fri May 24, 2019 3:10 pm
Desertbreh wrote: Fri May 24, 2019 2:58 pm

Sending you a bill for the time I spent reading about your "advanced" C5 issue. Cash or cashiers check please.
Oh shit, that should actually take care of the bill I sent you about the ridiculousness of your wheel saga on the :tits: mobile.
:roasted:

Obligatory C5 Thread

Posted: Fri May 24, 2019 5:52 pm
by Desertbreh
Detroit wrote: Fri May 24, 2019 3:10 pm
Desertbreh wrote: Fri May 24, 2019 2:58 pm

Sending you a bill for the time I spent reading about your "advanced" C5 issue. Cash or cashiers check please.
Oh shit, that should actually take care of the bill I sent you about the ridiculousness of your wheel saga on the :tits: mobile.
:amazing:

Obligatory C5 Thread

Posted: Fri May 24, 2019 6:04 pm
by Irish
Detroit wrote: Fri May 24, 2019 3:10 pm
Desertbreh wrote: Fri May 24, 2019 2:58 pm

Sending you a bill for the time I spent reading about your "advanced" C5 issue. Cash or cashiers check please.
Oh shit, that should actually take care of the bill I sent you about the ridiculousness of your wheel saga on the :tits: mobile.
Image

To both....

Obligatory C5 Thread

Posted: Fri May 24, 2019 9:47 pm
by wap
Detroit wrote: Fri May 24, 2019 3:10 pm
Desertbreh wrote: Fri May 24, 2019 2:58 pm

Sending you a bill for the time I spent reading about your "advanced" C5 issue. Cash or cashiers check please.
Oh shit, that should actually take care of the bill I sent you about the ridiculousness of your wheel saga on the :tits: mobile.
:ohslap:

Obligatory C5 Thread

Posted: Sat May 25, 2019 10:04 am
by CaleDeRoo
A guy in a truck backed into me at a stoplight last night then drove off through red light when I pulled over. Luckily he didn't have his hitch in so just the flat part of the receiver hit me.

Obligatory C5 Thread

Posted: Sat May 25, 2019 10:13 am
by Acid666
CaleDeRoo wrote: Sat May 25, 2019 10:04 am A guy in a truck backed into me at a stoplight last night then drove off through red light when I pulled over. Luckily he didn't have his hitch in so just the flat part of the receiver hit me.
You reporting it? I have a dash cam in my vette for dumb shut like this. I need to get another for my truck since it flaked out on me a while back

Obligatory C5 Thread

Posted: Sat May 25, 2019 10:20 am
by Apex
CaleDeRoo wrote: Sat May 25, 2019 10:04 am A guy in a truck backed into me at a stoplight last night then drove off through red light when I pulled over. Luckily he didn't have his hitch in so just the flat part of the receiver hit me.
:rage: