Anyone do a "Snorkel" Exhaust ??

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Fun thread- Brian- a question about your m37. I have a bj44 and I am thinking of placing the batteries in the space behind the rear wheels to free up some room in the engine compartment- just to make it easier to get to everything. Thie means that they will be placed just above frame level. Is there any special provision for waterproofing the battery/cable assembly itself?

Also I would like to know more about the various connectors etc for waterproofing. Are similar products available online? I'm looking into redoing my entire harness in the next years and thinking about the design.

As for me I think the stack is pretty cool looking- but as Brian said there are lots of other things to attend to first. I love the idea of routing all of the breathers to the intake- might have to try that.

pete
 
Yeah, the PO had one on my 40 project. One of several South American mods that have now been removed.

303156317_vXk3i-XL.jpg
 
peteinjp said:
Fun thread-

Also I would like to know more about the various connectors etc for waterproofing. Are similar products available online? I'm looking into redoing my entire harness in the next years and thinking about the design.
Click to expand...

X2 I figure that I will be replacing a bunch of stuff during the build anyway...probably won't cost much more to get some waterproofing done as well.

Doc
 
Unless you stall your rig with the engine under water, you will see no benefit from an exhaust snorkel. So long as the engine is running, no water is going in that way. And the water will not impede exhaust flow enough to affect anything at any sort of depth that you can ford.

I did have an exhaust stack on my '40 that is my primary trail rig but when I redid my rear bumper racks I did not have room to keep it. Would have liked to, but so far I have only stalled one rig with the engine under water, and that was a much lower rig than my '40. :)

Well, actually two rigs I guess, but the second one was nose in off of a steep bank and even though the engine was underwater, the tail pipe was not anyway.

I do have a fairly high exhaust exit from my rig. About 4 feet off the ground. it is not a major concern for this rig since it does not see a lot of street use, but I imagine it is a bit irritating for other drivers beside me at intersections. I may simply make an extension to attach to my current setup for the few times we are dealing with 5 foot or deeper crossings that also have something that makes them daunting enough to worry about stalling.

Big concern with exposed exhaust on the side or back of the vehicle is that it will be hot enough to sear flesh. You really have to keep that in mind. BEFORE your buddy leans against it or the 5 year old kid getting out of the car beside you at the mall winds up scared for life.


Mark...
 
Mark,
agree and disagree.
if the engine is running a an adaquate RPM to keep the water out, agree.
but
if you are running a larger exhaust and are idling though deeper water then the pressure of the water can over power the engine exhaust pressure and kill the engine.

example, i had a 2F power FJ40 with 2.5" exhaust and a free flowing muffler. i was idling across a pond at about 900 to 1000 rpm, the tires had good traction and the pond was a gentle slope down and back up the other side. in the center was a dip of about 6". till i reached the center the engine just putt putt putted along but once i hit the slightly deeper water the pressure over powered the engine and the engine stalled.
it turned out to be an expensive lesson to learn.

if i would have been running a stack then this would not have happened but stacks are too redneck for me.
 
i just welded a flange on mine and on the stack it can be put on in a couple minutes with 2 bolts .ive seen to many engines ruined when they hydrolocked with water.an innertube over the tail pipe will also work it will close up if the motor stalls.m37 dodges also use a flange set up for deep fording 2 bolts is all it takes and your ready to go .
 
Not sure I can agree with you conclusion Wayne. I have idled through a lot of 4 foot deep water (with normal tailpipes, not my 4 foot high one) and have never had a problem. Folks with me have done it too.

I have sat idling in deep water while rigging for extraction of another rig as well.

I submit that it was something else that caused your rig to stall and not resistance to the exhaust flow.

I will see if I can sit down and run some numbers later, but I am confident once I do, that the pressure coming out of the exhaust far exceeds water pressure at the depths we are talking about.

Or... I am full of crap and the numbers will not come out like I expect. I'll find out later. :)


Mark...
 
Considering that you need 2.307 vertical ft of water to equal 1 psi and your motor runs at over 100 psi per cylinder...

I'm having a hard time seeing it
 
yeah, I am thinking along the same lines, but I wanted to ponder a while and see if there was anyway that the pressures involved would be dropped somehow. So far as I can see, they aren't.

And that 100 psi mentioned, is just cranking pressure in a worn out engine, without any combustion involved. Toss in the combustion precess and there is a lot more pressure that has to be overcome before it comes anywhere near interfering with the intake and combustion process enough to stall the engine.


Mark...
 
I've also driven through 3'+ deep water without problems.

Where I've heard of problems is you suddenly let off the gas.
 
Why?


Mark...
 
so...
what do you feel happened then?
it was running very well before it stalled.
it was snorkeled and water proofed.

with normal sized exhaust i never had an issue but once i went oversized then this occured
???
 
Too many variables for me to try and guess really Wayne. If I had been there with you, then maybe so. Anything I suggest, you can honestly (based on memory and perceptions at the time) say "no I don't think so", and we will be right where we started. :)

One thing I have seen happen that sneaks up on a lot of people.... when you are poking along real slow and careful in deeper water with the engine lugging right at idle..... you step on the gas gently to accelerate slowly and fail to take into account the resistance of the water and stall the engine out before you even realize it is bogging. Soft bottom under the water will do that to. add in a little upgrade as you climb to the opposite shore. I have had that sneak up on me and seen it happen to others to.

That is one reason why I do not encourage extremely slow crossings unless you are the first in line at an unknown spot that is suspected to have drop offs.

And.... for the water to have come up your exhaust... even after the engine was stopped... that means that the engine had to be submerged at least as deep as the head. So... distributor and ignition system is a prime suspect since most if not all of it would have been underwater (they *can* be waterproofed pretty darn well, but it only takes a little water to sneak in and let those electrons have a party :) ), as is any less than perfect seal in the intake ducting.air cleaner/whatever else you had under the hood.

Just guessing really.


Mark...
 
yes, the electrical was under water completely. the water was over the half doors and level with the bottom of the dash.
yes, sad to say, gassers are prone to electrical ooops.
the bottom was somewhat firm
yes it was when starting to rise back out that it did fail
once the truck was winched out of the water, the inspection started. the engine was hydrolocked. the carb was level with water contamination. the t/case, tranny, diffs were contaminated, starter was toast, alternator was toast and winch needed rebuilding.

i have, for decades now, suspected it was the water pressure on the enlarged exhaust that caused it to die ... maybe it wasn't, maybe it was the electrical that caused the problem.

this video made me think of my expensive ooops every time i view it:
http://www.google.com/url?url=http:...+video&usg=AFQjCNG8CL8LnCxH9YZhrg2XXHWjQgJKzA
 
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