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Model specific boards => Golf mk3 => Topic started by: sierragls on 13 January 2013, 17:56

Title: Bonnet insulation.
Post by: sierragls on 13 January 2013, 17:56
My gti doesn't have any insulation under the bonnet, but is it worth getting any? Does it make much difference?
Title: Re: Bonnet insulation.
Post by: tweed on 13 January 2013, 18:05
nope no need for it
Title: Re: Bonnet insulation.
Post by: murraymint on 13 January 2013, 18:14
Mines in the bin   :cool:
Title: Re: Bonnet insulation.
Post by: F17BAD on 13 January 2013, 18:21
mines in my garage, jinks (my cat) uses it to sleep on while i work on the car
Title: Re: Bonnet insulation.
Post by: Wayne on 13 January 2013, 19:46
Not really needed unless you have a diesel.
Title: Re: Bonnet insulation.
Post by: ALTERNATOR on 13 January 2013, 20:52
Doesn't it reduce noise while driving along? :undecided: Was thinking of getting one considering the noise reduction
Title: Re: Bonnet insulation.
Post by: spikenipple on 13 January 2013, 20:54
I noticed quite a significant reduction in noise after fitting insulation to mine.
Title: Re: Bonnet insulation.
Post by: sharki786 on 13 January 2013, 21:03
I noticed quite a significant reduction in noise after fitting insulation to mine.

Made a difference
Title: Re: Bonnet insulation.
Post by: F17BAD on 13 January 2013, 21:07
hold too much heat in the bay
Title: Re: Bonnet insulation.
Post by: tshirt2k on 13 January 2013, 22:03
I found it transferring heat to the bonnet do put it back in.
Title: Re: Bonnet insulation.
Post by: tweed on 13 January 2013, 23:09
I found it transferring heat to the bonnet do put it back in.


Did you use a heat gun? Did you take a engine bay temperature before and after? Or just place your hand on the bonnet and thoughts that's hotter than before, it must be taking heat away from the bay and transferring it to the bonnet?

I think you will find that it's holding heat in and the bay and bonnet temp will raise.


It does not transfer heat from the bay to the bonnet!  :rolleyes:
Title: Re: Bonnet insulation.
Post by: tweed on 13 January 2013, 23:11
Think its just sound
Title: Re: Bonnet insulation.
Post by: Foreveryoungaus16v on 14 January 2013, 08:38
 :grin: agree with tweed
Title: Re: Bonnet insulation.
Post by: tshirt2k on 14 January 2013, 10:04
 Remember I have a turbo at back creating more heat than usual.
After getting bonnet painted, I noticed the paint needed polishing again after a short while. The painter mentioned something about too much heat causing faster paint curing or sinkage. The only thing that I'd done is removed bonnet insulation. So replaced it.

Just like a phenolic gasket it doesn't stop heat transfer, but I think it slows transfer And for the phenolic gaskets on my inlet manifold test l, I measured temps before and after as shown in my thread. .  :wink:
Title: Re: Bonnet insulation.
Post by: tweed on 14 January 2013, 10:26
Remember I have a turbo at back creating more heat than usual.
After getting bonnet painted, I noticed the paint needed polishing again after a short while. The painter mentioned something about too much heat causing faster paint curing or sinkage. The only thing that I'd done is removed bonnet insulation. So replaced it.

Just like a phenolic gasket it doesn't stop heat transfer, but I think it slows transfer And for the phenolic gaskets on my inlet manifold test l, I measured temps before and after as shown in my thread. .  :wink:

That makes sense! Unlike your first reply  :grin:
Title: Re: Bonnet insulation.
Post by: F17BAD on 14 January 2013, 11:36
Iv never had issues with my paint on my bonnet Russ, and as u know I have a big turbo on mine

The insulation on the underside of the bonnet keeps the heat in the bay too much IMO and that's not what I want

They also hold moisture too and go damp if the car is not used for a few days (in colder months etc) leading to oxidization of parts of the engine

This is just what I found personally and that's why mines not fitted, oh and also because my engine cover is pretty close to my bonnet as it Is  :grin:
Title: Re: Bonnet insulation.
Post by: tshirt2k on 14 January 2013, 11:55
Cold and damp! The joys of northern life eh?? :evil:

Title: Re: Bonnet insulation.
Post by: F17BAD on 14 January 2013, 13:19
Hahahaha  :grin: