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Engine noise reduction and power increase?

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retroman View Drop Down
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Joined: 26 Apr 18
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    Posted: 26 Apr 18 at 21:48
Hello everyone.

Tomorrow I'm planning on buying a 1986 LT35
motorhome with 6cyl turbodiesel (intercooler) engine. So far, my only
experience with LTs has been a test drive of an LT28 a few days ago. One
of the things which struck me about it was how the engine noise was
really penetrating into the cockpit. I also noticed how I couldn't comfortably build a speed above 80km/h. Are these things to be expected with all LTs or did I possibly test drive a banger?  I'm really keen on the one I'm going to look at tomorrow but some advice could really go a long way towards helping me make this big decision. If I find that the noise level is actually normal, are there any known means to reduce this without using bitumen based sound deadener. I was thinking that since the engine is located in the space between the two front seats could I just place a localised sound proofing box over this (a bit like the noise reducing boxes they use for generators)? Has anyone had any luck placing materials over this space and actually making any difference? I was even thinking about some custom made and carefully position sand bags covered with acoustic blanket and carpet. Knowing that something can be done will really help me make that decision as everything else about the van is perfect.
Also, Other than a full engine replacement, are there any modifications which can be done to increase max cruising speed? I do like this van, so I could spend a few K replacing the engine if I have to. If that is recommended, would anyone have any suggestions, bearing in mind that I'm planning on installing a vegetable oil kit so that I can run it on pure veggie oil.
Many many thanks!
Pete
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Monster LT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Monster LT Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 18 at 22:20
Intercoolers on the LT were introduced later than 1986, early 90's, so it's had it's engine replaced or modded. If you don't like noise then you'll have problems running any D24 engine, so don't buy an LT or anyother old diesel. Sound isolation carpet makes alot of difference though. It should have an isolation cover over the engine compartment. If it's in bad shape or is removed then it'll sound alot loader. D24's can run on veg oil from what I've read. Lots of mods possible if you want something with more power but i think speed will be difficult to increase much without changing gearbox / diffs? Check out the mods people have done on their Volvo D24TIC's. Probably quite a few in Norway...
Anyway your LT should cruise at around 90kmph and get around 110kmph at 3900rpm or so wthout exploading ;-)
LT45-TD-ACL-intercooler-4x4-1993
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Buss Marius View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buss Marius Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 18 at 09:56
I would imagine that a turbo is the best sound deadener. And as a turbo engine is working more relaxed it want make that much noice, so i think it will be much more comfortable. Look from 4min into this video https://www.youtube.com/watch?v=_enTrQKgOrQ I think he has a TD-IC engine. It sounds a lot more silent than mine with the mighty 75hp engine.
Is it aproved with the TD-IC engien in it? Mine has 75hp in the registration papers, so for me it is a problem to instal something bigger and get it aproved. And the importer, Scumbag-Møller say they don't have anny information on the VW LT1 at all. So i can't even instal a 102hp turbo engine.
It is not rocket science to instal a 5syl 2,5TDI engine in it. A guy in Austria has instaald a 140hp 2,5TDI and chiped it to 180hp.
In my 87 Karmann LT L i've decided to live with the noice. On my GPS it does 108km/h max but we cruise at 85-90kmh (GPS) on flat rooads. Up the Lierbakken hill we do about 65kmh With the weight of 3100kg
87 Karmann LT L 2,4D. 89 T3 Syncro Reimo 1,9TD. 2000 T4 Caravelle TDI
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retroman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote retroman Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 18 at 16:59
Thanks guys, for the replies. I watched the video in the link and I can't believe how quiet his engine was. If I was registered on youtube I would put a question to the guy asking him if he's done anything to reduce the noise. But it was very useful to know that the noise and low speed is normal for an LT. This info saved me a trip from Norway to Sweden and much disappointment. I decided to go for a T4 campervan (holdsworth valentine special from 95) instead.  It won't look any where near as nice though. I'm hoping to have it painted in RAL 6003 (one of the standard military olive greens). The fitted furniture is all done in tacky ash plywood. So I was hoping to get a specialist to put a real wood veneer over it all. Then do the carpets and upholstery. This will all set me back a few grand but this T4 actually works out to be 4k cheaper than the LT so I thought I could afford to splash out. Does anyone know of any firm which can quote me for all the work including spraying? I know there are loads of caravan renovators out there but I'm looking for someone affordable and good at what they do. Is this the kind of thing which people go abroad for e.g Poland, like they do for dentistry? If I manage to get this done I will post some before and after pics. Thanks again.
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Serge View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Serge Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 18 at 09:15
The chap who made the film is Tim Aldiss and he's a member of VOLT, you can join the Facebook group here: 
http://www.facebook.com/groups/voltowners/?multi_permalinks=10156446837549421&notif_id=1524987616438101&notif_t=group_activity&ref=notif
1990 LT28 Westfalia Florida 2.4TD + Reliant Scimitar GTC + Mk 4 Mondeo + Triumph Trident Sprint 900 + Honda 550/4
http://www.sergeantsmess.eu/
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retroman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote retroman Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 18 at 11:49
Thanks Serge.
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