Under Bonnet Insulation

Sinclair · Aug 19, 2015

I've just had my 944s2 resprayed and have already found some paint crazing above the rocker cover. I'm going to install some high temp, sound proofing under the bonnet, has anybody done this and if so what did you guys use. Cheers Ian

Paul 290T · Aug 20, 2015

Hi,

I fitted this:

http://www.classic9leathershop.com/bonnet-liners-for-porsche/hood-bonnet-liner-heat-shield-for-porsche-944-924-automobiles/

to my 944 a few years ago. I chose the 1/2 inch thick version. As a result there are impressions of the power steering cap and a few other ancillaries indented into the liner. So, you might want to choose the 1/4 inch version to avoid this.

Make sure the glue is fully cured before starting the engine, I suggest leaving it over night. Or else the solvent rapidly given off will balloon your new liner massively and you'll have a right job trimming off the now stretched excess liner materiel and refitting it all. And no, don't ask me how I found this out.

Reagrds
Paul

PSH · Aug 20, 2015

This is something that I've needed to do for many years but never got around to it...I haven't refitted new sound proofing for the simple reason on wanting to keep heat levels under the bonnet as low as possible but I do want to do something about the mess left from removing the old insulation. I did see on youtube a video where someone has used a sound insulation spray ( Boom Mat )to do the job. It looked very nice and certainly won't trap heat like the original insulation pads, the only question is will it withstand the heat generated under the bonnet? since it will only take 1 can to do the job I will probably give it a try and see how well it bears up...

Pete

GlennS · Aug 23, 2015

Sinclair said:
I've just had my 944s2 resprayed and have already found some paint crazing above the rocker cover. I'm going to install some high temp, sound proofing under the bonnet, has anybody done this and if so what did you guys use. Cheers Ian

I'd have a word with the paint shop. The 944 S2 doesn't need under-bonnet sound proofing / heat shielding and it was never fitted by the factory. If your paintwork is crazing there is something amiss with the way the respray has been done.

Paul 290T · Aug 24, 2015

Adding the under bonnet insulation did quieten my car down slightly. This might be something you would want

adrianhunter · Sep 19, 2015

All,

I am planning to have my 82 Lux sprayed within the next year.

Not knowing any better I was planning to just replace the (largely disintegrated) OEM soundproofing pads with new.

Is the consensus that I may be better off not bothering to prevent heat buildup? The noise wont bother me overly as it hasn't really had any soundproofing since I bought her!

Your thoughts appreciated!

white944 · Sep 20, 2015

I wouldn't have thought heat buildup is really going to be an issue on a standard car. After all, Porsche designed it that way.

PSH · Sep 20, 2015

white944 said:
I wouldn't have thought heat buildup is really going to be an issue on a standard car. After all, Porsche designed it that way.

i agree..a standard car won't gain much if anything by removing the insulation except a little more noise, especially N/A...turbo's get hot under the bonnet even in standard form but the cooling system is excellent at doing it's job even when heavily modified. It is worth removing it though when involved with big mods, more so if you have a filter fitted under the bonnet which will be sucking in very hot air and thus loosing a substantial amount of the power available.

Pete