Exhaust Lagging

[wobbly ollie]

I am looking to re lagg my exhaust pipe but wanted to check if there was any method or advice available? Eg. How many layers? Best method of securing? I already have a new pop studded jacket/sleeve ordered for the manifold (Barrus Shire) but any help would be welcome.

[luggsy]

Have a look on YouTube on how to lag it 

[wobbly ollie]

Thank Luggsy

I am struggling to find anything on youtube that refers to a narrowboat diesel. Most are based on motorbikes....but i guess its the same principle... 

[bizzard]

4 minutes ago, wobbly ollie said:

Thank Luggsy

I am struggling to find anything on youtube that refers to a narrowboat diesel. Most are based on motorbikes....but i guess its the same principle... 

Just wind on one layer with half width overlaps something like 2'' wide fireproof tape, securing at regular intervals by two round turns and twist together of copper wire. Copper wire pulled out of old mains domestic twin and earth cable will do fine, the grey plastic covered stuff.

[wobbly ollie]

16 minutes ago, bizzard said:

Just wind on one layer with half width overlaps something like 2'' wide fireproof tape, securing at regular intervals by two round turns and twist together of copper wire. Copper wire pulled out of old mains domestic twin and earth cable will do fine, the grey plastic covered stuff.

Am i right in saying that the purpose of the wrapping is to retain heat within the exhaust and reduce noise to some extent....? 

[bizzard]

2 minutes ago, wobbly ollie said:

Am i right in saying that the purpose of the wrapping is to retain heat within the exhaust and reduce noise to some extent....? 

Well it does that a bit, but its mainly to prevent you from burning yourself on it and to prevent burning or scorching anything close by.

[wobbly ollie]

Got it thanks. 

[Muddy Ditch Rich]

2 hours ago, wobbly ollie said:

Am i right in saying that the purpose of the wrapping is to retain heat within the exhaust and reduce noise to some extent....? 

Nope.

[Machpoint005]

2 hours ago, bizzard said:

Well it does that a bit, but its mainly to prevent you from burning yourself on it and to prevent burning or scorching anything close by.

I agree with its purpose, but the noise still comes out of the spout, not the casing (pipe) and the heat is all waste heat anyway, so it doesn't matter where it is thrown away!

[ditchcrawler]

2 hours ago, Machpoint005 said:

I agree with its purpose, but the noise still comes out of the spout, not the casing (pipe) and the heat is all waste heat anyway, so it doesn't matter where it is thrown away!

But without the lagging your enine hole could get much hotter as someone posted the other week.

 

[mark99]

I used titanium wrap and use two layers 55% overlap  and secure with hosepipe clips. Wire is ok but can snag you hence the clips. Jubilee clips iirc. The titanium does not stain like the white stuff.

Edited May 8, 2017 by mark99

[mark99]

Note there is a scavenging benefit to wrapping but thats for high perf. engines not your canal boat engine. 

[wobbly ollie]

Thanks folks. Any specific source or just a case of Googling 'exhaust wrapping'

[Chewbacka]

I got mine from ebay.  Use 'exhaust tape' in the search box.  Often comes with some stainless steel cable ties if you don't want to use copper wire.

[mark99]

Be careful applying the stainless ties they are sharp edged. I would use gloves and pliers.

[magpie patrick]

12 hours ago, ditchcrawler said:

But without the lagging your enine hole could get much hotter as someone posted the other week.

 

Indeed: that someone was me, air cooled engine sucking in hot air.. 

[1st ade]

47 minutes ago, magpie patrick said:

Indeed: that someone was me, air cooled engine sucking in hot air.. 

... some of it from the unlagged exhaust, the rest...

[GUMPY]

I have a load of new lagging in my lockup. You can have it for a couple of beers, our exhaust is water cooled so no need to lag it 

J

Edited May 9, 2017 by Loddon

[Chewbacka]

Deleted, appeared in a different thread to the one I was reading - most odd

Edited May 9, 2017 by Chewbacka

[magpie patrick]

11 hours ago, 1st ade said:

... some of it from the unlagged exhaust, the rest...

From the politicians and university lecturers I keep in the engine bay...