Ultraman wrote:
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Scott7 wrote:
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Ultraman wrote:
I'm sure Nebraska is in there somewhere on your short list..........speaking of lists...where has Joe been lately..?

Dang - not on my short list but I do remember when I was a young pup we made trips to Grand Island NE for the drag strip, long time ago like early 60's. I think it was in '62 when a friend broke the B Gas record for the quarter mile. That was ages ago and miles away !

Yeah that goes a ways back....Grand Island Jaycees Drag strip.....I don't know when it shut down but its been awhile. Fairly famous track in its day. On the national registar back in the early 60's.....

Kearney is the closest strip now and I hear they are building a new one between Lincoln and Omaha....

BillH wrote:
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Matatk wrote:
Ha...no way NY pizza is better. And I've had it in NY, just as I have here in Chicago. I personally prefer the pizza from back home in Detroit over both of them.

Been here?

http://www.loumalnatis.com/?gclid=CIrkn_Wp0rUCFap_Qgod9zoAng

I have the recipe.

Ultraman wrote:
I'm sure Nebraska is in there somewhere on your short list..........speaking of lists...where has Joe been lately..?

BillH wrote:
Ignore Matthew.........Look where he lives.

Colorado is the second best state in the country.

There's only 3 good states anyway.

BrianCunningham wrote:
Getting back to looking more like the production cars

http://m.autoblog.com/2013/02/20/chev ... id=autoblog_river_article



http://m.autoblog.com/2013/02/20/ford ... id=autoblog_river_article

BrianCunningham wrote:
You know they do road courses as well :0

Scott7 wrote:
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Matatk wrote:
Where's Colorado?

Ah....forget it - who cares.



Matthew

Alot of us do , yea it is today but a couple of days ago - not so bad . And just incase you're lost someday and need to find Colorado - We're south of Cheney country, west of Brownback, have a little touch of Heineman to our east and north; a little bit of Fallin to our east and south; a big bunch of Martinez south of us, and of course we have to touch Brewer (and it is only a touch ), and to our west we have Hebert.

Now the really cool thing is we may be surrounded by extremely well known places and identies, we still have a very cool governor known for starting a MicroBrewery - - we also have some fairly significant mountains to play in. COME and VISIT US

Matatk wrote:
Where's Colorado?

Ah....forget it - who cares.



Matthew

BrianCunningham wrote:
...

bogus wrote:
I have never had a problem driving mine in the snow.

BillH wrote:
I drove more than one C2 in the snow a lot....a lot.
No problems at all.

Ultraman wrote:
Hell throw that up in the attic....it's still good.....

CentralCoaster wrote:
I did not do the back at the time because I didn't have it apart. I don't recall if I did the back behind the seats.

The back though is probably a huge source of noise. I can even hear my ring & pinion gears. (That's a whole nother mess why those are noisy), but yeah, I might have a different opinion if I didn't have just half of it done.

CentralCoaster wrote:
Just remember, fluffy insulation dampens higher pitched noise, like white noise, wind noise, etc. The factory carpet padding does this well.

The denser insulation dampens out lower frequencies, bass, maybe some of the exhaust resonance. It doesn't require as much thickness of it to get the same mass as the fluffy stuff. Plus 1/4" of it would really add weight.

I put 2 layers wannabe dynamat in the front half of my car, kinda wish I hadn't. I think the seller called if fatmat. It basically added 10 lb to the front half of the car, minor carpet/trim fitment interference from added thickness, and it will never come back out without a massive mess. Results are dubious. I believe the product is actually called peel n seal, used for waterproofing shower membranes. It is a thick tarry film on a roll with foil covering.

I think the doors are a big source of noise. There is a product that goes inside the door panels I might try, for various other reasons, including quieting any minor rattles from all the stuff in the doors.

And I assume you're running the fiberglass top with headliner, not the ez bake top.

BillH wrote:
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Scott7 wrote:

Okay, okay I know I should have kept my '67 something about hindsight comes to mind. SO, I guess I shouldn't mention my 72 ontario orange 454 4 speed convert .

When my company moved me here from the east coast, they would only move one car.

At that time I had the 67, a 65 roadster and a mint 76 Coupe with 15k miles. Had to sell two of them.

The 67 is #5 for me and the 92 is #7.

The 67's been sitting because of racecars.

EngineDoctor wrote:
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Scott7 wrote:
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EngineDoctor wrote:
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BillH wrote:
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Scott7 wrote:
Wow - I remember when I had a '67, wish I still did. My little blue 327 convert w/ 4 speed and factory side pipes. I bought it for somewhere around $2,000.00 back in '72 and sold it a couple of years later . Live and learn

$3k in 74 Scott.


But I kept it.

Ya, I rebuilt my headlight assy not to long ago ...Wat a pain in the azz!!
And $6500.00 in 1984 for my C2
I kept mine too.

Okay, okay I know I should have kept my '67 something about hindsight comes to mind. SO, I guess I shouldn't mention my 72 ontario orange 454 4 speed convert .

Hmm.. You sell that one too ?

BillH wrote:
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Scott7 wrote:
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Matatk wrote:
Two sources:

http://www.exoticvette.com/insulation%20c4.htm

OR

http://www.corvettemods.com/C4-84-96- ... Complete-Kits_p_5565.html

Matthew

I’m sure you could use a little time off and would like to come to colorful Colorado and help me with this little effort

I’ve also been looking at this double coverage Mid America Motorworks offering:

Scott

I'd come over to colorful Colorado, I spent almost 3 years there racing motorcycles, er, going to collage.

The vettemod kit is worthless, no foil.

The other 2 kits look pretty good.

One of my jobs at Ingersoll-Rand was "sound control engineer" trying to quiet down construction equipment at a time when no one else was doing it, - not easy.

I did use close cell foam with doublesided foil in the engine compartments, it worked well on higher frequencies, so I like these kits for some of the road/wind noise.

I think you have to separate exhaust noise/resonance from the road noise. Exhaust is at lower frequencies and an exhaust system also vibrates thus the resonance.
And I agree that the rear of a C4 underneath the car has a lot of spaces that will act like a base speaker cabinet.
So, if you want to keep the current exhaust system, the only thing you can do is change the mass of some of those panels so that they vibrate at a different frequency - the bed liner Andy mentioned or maybe undercoating.
Or change to Corsa, their engineers must a boatload of time working on the resonance thing.

The exhaust thing would take a lot of experimenting.

Your custom rear valance may be contributing somewhat, it would be interesting to pull it off and see if anything chances.

-=Jeff=- wrote:
I am not sure the CC kit will cut down exhaust noise.. it might a bit for road noise, but in my ZR-1 I replaced all the Jute with the CC kit. the best for road noise will be dynamat or similar installed in the car.

I did the CC kit because of the foil and how it is suppose to deter heat, but I have not really seen an improvement, but again, I have nothing to base it off of, I replaced all the jute before I drove the Z for the first time

EngineDoctor wrote:
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BillH wrote:
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Scott7 wrote:
Wow - I remember when I had a '67, wish I still did. My little blue 327 convert w/ 4 speed and factory side pipes. I bought it for somewhere around $2,000.00 back in '72 and sold it a couple of years later . Live and learn

$3k in 74 Scott.


But I kept it.

Ya, I rebuilt my headlight assy not to long ago ...Wat a pain in the azz!!
And $6500.00 in 1984 for my C2
I kept mine too.

Matatk wrote:
Two sources:

http://www.exoticvette.com/insulation%20c4.htm

OR

http://www.corvettemods.com/C4-84-96- ... Complete-Kits_p_5565.html

I have zero experience with either kit so I can't comment. You might have to do a little homework. Maybe you can be our guinea pig

Matthew

Matatk wrote:
There is a vendor who sells a precut sound deadener package for the whole car. His screenname is something like crazy cowboy. I'll find the info and post it later.

bogus wrote:
I have used frost king duct insulation with moderate success.

Another option is truck bed liner.

Work with the doors and the rear cabin area. Those are the real noise factories.

The best fix for exhaust is converting to Corsa! Not much will kill that resonance.

pianoguy wrote:
I just heard that it is snowing 80 miles from here. Ho-ho-ho!

Travis93 wrote:
40th anniversary cars have chrome looking emblems if you look for '93 anniversary edition you should be able to find them almost anyplace.

BillH wrote:
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Matatk wrote:

Good explanation, Andy.

"The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a transistor used for amplifying or switching electronic signals. Although the MOSFET is a four-terminal device with source (S), gate (G), drain (D), and body (B) terminals,[1] the body (or substrate) of the MOSFET often is connected to the source terminal, making it a three-terminal device like other field-effect transistors. Because these two terminals are normally connected to each other (short-circuited) internally, only three terminals appear in electrical diagrams. The MOSFET is by far the most common transistor in both digital and analog circuits, though the bipolar junction transistor was at one time much more common."

Very Good.

Now explain propagation delay in a circuit.

josephf31 wrote:
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Woodstock wrote:
The clamp holds some sort of foamed rubber which is acting as a filter. No connections on that side of the solenoid!

I believe this is correct. I can look my '91 to confirm but I'm almost positive this is right.

Matatk wrote:
I have considered it on my car, just never got around to doing it. I'm not sure what water pump Scott is running.

jonszr1 wrote:
have any of you guys thought of going to an edelbrock water pump. have flow more water with a better balanced flow the dirt track guys swear by these things . since you have an 89 you have this option .

Matatk wrote:
Ray -

Thanks for the input. I agree that having coolant flow too quickly can cause overheating.

In my case, I have a standard GM radiator and standard flow water pump. My overheating is at idle or low speed....so the coolant isn't traveling through the system too quickly imho. Doing 55 mph with sufficient coolant flow and air flow in combination I do not experience the overheating problem. Because of this, I still theorize that too much trapped heat underhood is contributing to my problem.

Matatk wrote:
Thanks for sharing your experience. Unfortunately Scott already has a dewitt's radiator installed so that isn't the issue. We are leaning towards high underhood temps with limited air circulation as the main factor.

Matatk wrote:
Maybe you should send me that spal fan to test fit in my car and I'll report my results back to you

Scott7 wrote:
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Matatk wrote:
Also, any pics of your hood vents?

I would really like to share some pics but unfortunately I'm having difficulties uploading. As soon as I get this worked out. . .

Scott7 wrote:
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Matatk wrote:
Also, any pics of your hood vents?

I would really like to share some pics but unfortunately I'm having difficulties uploading. As soon as I get this worked out. . .

Matatk wrote:
Also, any pics of your hood vents?

Matatk wrote:
Oh, and as far as "normal" operating range, the main fan on the L98s was not set to come on until the 228* range or so, the secondary fan was set to come on around 238* or so. The stock tstat is a 195*. These higher temps were used for emissions more than anything else. I don't like to run my car at 225* even though that's what they designated.

I have noticed that after my break in period when I switched to synthetic oil, the oil temps were much lower and more stable. I also noticed that bypassing my heater core lowered my coolant temps. I think it was gunked/clogged after 20 years before it finally sprung a leak.

Matthew

Matatk wrote:
And I'll be looking forward to hearing your impressions on the fan upgrade.

I normally have zero issues with overheating. I have a newer AC Delco radiator, new water pump, everything flushed when the new motor was put in, 180* stat, fans lowered, etc. On a cool day at cruise I run in the low to mid 180s, sitting at a long light I'll creep up to 210* or so. Start moving and it drops back down. On warmer days, I might run 195* at a cruise, same issue at traffic lights. Now that the a/c is fixed, I'm experiencing the coolant climb up to 230*.

Another thing to note is I know the fan normally turns off over 45 mph...I have to check the FSM to see if that is true if the a/c is on, as well. If that's the case, if we are still experiencing high temps at 45 mph+ with the a/c on, we need to shift our focus away from the fan cfm....and I think back to underhood temps.

Matthew

Matatk wrote:
Interesting that we both have uncoated headers. I think that contributes a lot to the underhood heat. Perhaps that large volume of heat soak that is under the hood is preventing the radiator from cooling well. Even with a fan blowing, I think it's picking up a lot of the hot air and just blowing that around. That retained heat may also be affecting the hoses and other portions of the system under the hood.

I agree there has to be a viable solution. I'm wondering if coated headers (and in your case wrapping the supercharger system) would be a great benefit?

Matthew

Matatk wrote:
I was thinking about this post on the way home as I had my a/c on. Temp outside was around 100* depending on location. I was in mixed rush hour traffic on the surface streets and highway...from a crawl to 55 mph. I saw my temps creep up to 230 on the coolant but never got above 200 with the oil (Mobil 1 synthetic). Turning the a/c off brought the coolant back to 205-215 but never below that.

I don't have coated headers and I know that contributes to my underhood temps.

I think that the extra heat generated by the a/c might be overpowering the cooling system in general.

You have a supercharger, etc. Is any of that piping, headers, etc coated or wrapped?

I have been considering hood vents for a while to help reduce the temps underhood. I think evacuating that extra heat might be the only way to reduce the coolant temps.

Just me thinking out loud. Any updates on your fan upgrade?

Matthew

Matatk wrote:
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Scott7 wrote:
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bogus wrote:
oh, dear.

Hi, I guess I don't understand the "check the OP's Scott7 address" comment from Flyboy. Could you tell me what this is referring to? Thx, Scott

I didn't understand it either, don't feel bad.

Any update on your overheating issue?