Exhaust blankets

[John F.]

I've put these off for too long. Crows Nest needs new exhaust/turbo blankets. I've contacted MESA, but was wondering if anybody knew of a shop that could make custom blankets in the mid-Atlantic or Northeast? Thanks

[Carl]

I was surprised to find little in the way of materials for non-custom AKA DIY blankets.

Years ago I did a heat wrap on the vettes headers...made a huge difference and lasted many many years.
Thought maybe I could do the same for the boat...

Or maybe I was just looking in the wrong places.

...anyway, I'll be keeping an eye on this post.

[bob lico]

paul the owner at marine manifolds located in Farmingdale, Long Island, NY has all you need.i have them on Phoenix for 13 years.

[Yannis]

May I ask what the turbo blankets are for? Does every turbo need to be tucked-in? Why? Thanks.

The risers I understand, they get too hot so that blanket protects from accidental burns or perhaps fire hazards, but the turbos? Doesn't the non dissipation of heat harm them?

[Snipe]

https://www.firwin.com/
This place is great just provide a quick scetch and some measurements and they fit like a glove every time.

[John F.]

Bob and Snipe-thanks. I'll check with them.

Yannis- The Detroits in Crows Nest have dry turbos that get really hot.

[micky]

John, what detroits do you have on your boat??

[Yannis]

Thank you John, I thought that just because they get too hot they needed to dissipate heat. That blanket keeps the heat inside, doesn't this harm the turbos?

[John F.]

My understanding is that without the blankets, the turbos are a fire hazard as the dry turbos get really hot. And the pictures aren't working out. Sorry

Port motor with blanket:



Starboard motor without blanket:

[bob lico]

yes, definitely a fire hazard. the grey blanket in the upper right was made by Paul and the blanket is stitch with SS wire, very neat and clean. let me post an old photo of the port engine blanket is easily seen.please click on photo to show entire engine.

[bob lico]

[Yannis]

Fire hazard even in a diesel?

And the fact that all the turbo heat cannot dissipate? Doesn't this harm the turbo?

[bob lico]

of course, it dissipates there is an increased diameter "hot pipe" from the output of the turbo .back pressure is almost zero. the blanket helps increase the scavaging effect and the Cummins owned Holeset turbo is one of the most reliable in the world. the pyrometer never exceeds 850 degrees. Most important the custom made sprinkler head is facing straight down with the water entering the sprinkler from above in a perfect circle with no hot spots like your Yanmar installed at an angle. the advantage here is to have the water entering the sprinkler head at least two feet from the turbo output which will keep the sulphuric acid (form by salt water plus diesel exhaust)away from the turbo.

[Yannis]

Thank you Bob,

A bit too high tech for me, but sure makes sense. My STP’s do not have these blankets, does all this also mean that I should go out and install some? Thanks.

[bob lico]

ok, Yannis this is a better way of explaining. I am referring to increasing the volumetric efficiency of a marine diesel engine. basically the more air/fuel you can stuff into the cylinders the more power you will achieve. we already have a turbocharger to increase our volumetric efficiency but if we can get ALL the exhaust out of the cylinders there will be more room for the next incoming charge. number one we make as few radical turns as possible in the exhaust piping, number two we size up the exhaust from the diameter of the output on the turbo to reduce back-pressure.we do this by using "hot pipe" after the turbo BUT before the point were we inject the water to cool the exhaust, that point being the sprinkler head .the use of that hot pipe after the turbo sets up exhaust harmonics as well as keep the sulfuric acid from eating away your sprinkler head (very, very important in a yanmar because they build the sprinkler head out of aluminum instead of stainless steel or better yet Everdor(caterpillar.)the blanket over the hot pipe help the scavenging effect of the exhaust heat transfer to pull all the fumes out of cylinders for better performance this is the best i can explain the advantage.

[Rawleigh]

Yannis: These are dry turbos on Detroits which are notorious oil leakers. In addition to the oil, they can blister the fiberglass, etc..

[John F.]

which are notorious oil leakers.

I prefer to think of them as self-lubricating.

[Yannis]

Bob, thanks, I appreciate your various explanations.

[Rocket]

At my work, we use exhaust blankets as part of our fire protection system in our mobile equipment. These are custom made for us by a local supplier and are actually quite reasonably priced. If you call a dealer of industrial equipment like a John Deere dealer or a CAT dealer they would have a sub contractor who can custom fabricate the blankets at a reasonable cost.

[John F.]

I wound up using Anchor Insulation in Pawtucket, RI. They do industrial stuff as well as boat stuff. Their price was significantly lower than the other vendors I contacted, the turn-around was really fast, and the blankets are just fine. Based on my experience to date, I highly recommend them. My POC their was Jordan Fiske. He promptly returned emails, texts, and calls. Great experience all around.

[bob lico]

all is well that ends well !