Thread: BONNET UNDERSIDE INSULATION

I'm not too concerned about paint discoloration on a twenty year old Landy. It'll have its first lot if 'bush pinstripes' soon lol

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gone in 45 secs....what a great idea...looks cleaner too!

Originally Posted by WillsTdi

It's gone in 60 seconds. My brother in law was here in his Disco at the time and his is now no more as well it was worse than mine eh!

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gone in 45 seconds...what a great idea, looks cleaner too !
robbo

Originally Posted by deadfishdisco

gone in 45 seconds...what a great idea, looks cleaner too !
robbo

Yep. No noticeable increase in engine noise either!

So no noticeable increase in engine noise and I can stop being showered in the insulating rubbish every time i open the bonnet??

Well then, that will be another task for the weekend.

Originally Posted by landylover

So no noticeable increase in engine noise and I can stop being showered in the insulating rubbish every time i open the bonnet??

Well then, that will be another task for the weekend.

No increase in noise that I could telland I was getting covered in that itchy stuff too.................

Right then, that will be a task for the weekend

Just one consideration before you remove. I have had a chat to a few people about this since the thread went up and then ran a small experiment on it myself to see.

The feedback I got was that by retaining the under bonnet insulation you are actually reducing engine temps because of it's inability to absorb heat. While it may seem that removal of the insulation allows the engine bay to breath easier and not be stifled, if you remove it the underside of the bonnet heats up to a temp far higher than if you had the insulation on. The under side of the bonnet not only retains heat for long period it also relays that heat back onto the engine and inside the engine bay.

I've got a pretty good base point for how hot my Disco runs (97 tdi) across of range of daily temps, up hills, driving over extended distances etc. due to my digital gauge, so I took my insulation out and ran the Disco around for 3 days. On average the engine ran 5 degrees hotter under all circumstances and occasionally got up to 90-95 on long trips (never gets to 90 ever with the insulation on).

Based on this, if my insulation ever wears out I'll be going to a wrecker to source another. 5-8 degrees hotter doesn't sound like much and you will still be running at a safe operating temp, but given the sensitivity of the tdi to overheat I'd prefer to eliminate as much risk as possible.

Just my 2c.