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Have been thinking of redoing the carpet in my 73. What advice do you guys have for the best under-carpet insulation? I would like to cut down most notably on the heat, though lowering the noise a bit would be a nice additional benefit.
I know Dynamat and Dynaliner together are nice, but that can be pretty 'thick' - so I thought I would pose this here. What have you used? How has it worked? Do you like it? Would you do it again?
lot of threads on this already. You'll find lots of opinions, recommendations on brand and effectiveness of insulation. On my 73, the biggest impact was bypassing the heater core and changing the blower motor to a C4 motor. I grew up on Long Island but I live in Texas now. Heat is a thing here so start with those two first and go from there. Dynamat is expensive and the alternatives are not cheap either so Id go there last. Core bypass and blower motor first. Also consider an exhaust wrap.
I install cut out pieces of Reflectix from Lowes as underlayment and works great. Also the trans tunnel insulation the vendors sell plus foam collar over the bell housing. Plugging all air leaks in the firewall from wiring and vac hoses is equally important. Hope this helps.
Agree bypassing the heater core or at least a water shut off valve is at the top of the list too.
I’m using Thermo Tech Cool It Suppressor Mat in my 73’s interior, and the firewall.
I’ve only completed the firewall for now and once I’m ready to install the carpet, I’ll install the Cool It Mat throughout the interior.
I used their Heat Barrier in the transmission tunnel.
It was easy to lay down and both have self adhesive backing.
Thermo Tech also sells their own seam tape to seal the edges.
Like the other brands, it is expensive.
I purchased my carpet from Al Knoch interiors.
I ordered the carpet separate from the juke padding so I can add the juke only where I want it.
Lots of good suggestions in this thread. Looking up “C3 corvette forum heat insulation” on the google machine will show a bunch more too.
Some other ways to reduce engine bay heat is making sure the transmission tunnel “horseshoe” piece is there, making sure the engine isn’t running hot from retarded ignition timing, installing a shutoff valve for the heater core, and if all that’s not enough, wrapping or adding some insulation above the exhaust under the cabin.
Carpet Underlayment
