"J" tubes and sled tins

[67rustavenger]

I'm at a point in my engine build that I am installing the exhaust.
I have an 1 5/8" merged header and the "J" tubes pass below the push rod tubes.
I'm kinda at a loss as to what to do about sled tins to deflect the spent cooling air out the rear of the lower portion of the engine.
I did a search and found a few tins that were modified and some were custom made. But really none of them were great.

So I'm curious. What have you done when running "J" tubes?
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[Pruneman99]

http://vwparts.aircooled.net/Industrial-Cooling-Ti...g-tins.htm

These are probably what you're looking for

[Glenn]

You're going to have to modify stock sleds and fabricate tins to close it off. Industrial tins will not work with that header.
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74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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[modok]

Although some maintain that the sled tins aid cooling, I'm not really convinced..... I mean....maybe, it is logical to direct the hot air backward if the car is going forwards, but the air under there is going all different directions, so common sense may not actually work. Certianly the first 2" of the sled tins are important because they have a shape in them that directs the air AROUND the cylinders, just like the back smaller pieces that bolt below the upper tins. In fact, they may be identical, I know one side is but maybe not #3. yeah, if you cut the #1 sled tin you can make it into a #4 rear deflector.

Anyway, right sled tin is important to run if you have a thermostat, but if you don't, then, maybe it isn't worth re-creating the sled tins exactly VW did. You can make your own solution.

[Glenn]

[67rustavenger]

Sadly there will be no therostat on this build. So that will not interfere wit the sled tins.
So what I'm guessing is that most don't even run sled tins with "J" tubes.

Thank you for the input so far.
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!

There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo!

[chrisflstf]

You can make them fit. A simple washer welded and a hose clamp makes for a secure fit

[jason]

I remember that they help over 45mph. Hard for the air to exit underneath, high pressure low pressure not playing well. If you have ever messed with HVAC, you’ll understand. I just cut a hole and put it through. Industrial tins on outside

[Glenn]

The Berg headers clear the thermostat and stock sleds.

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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"

Member #1009

#BlueSquare

[vwracerdave]

I have not run thermostat or sled tins in over 30 years and none of my engines have ever melted down.
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[chrisflstf]

[VW_Jimbo]

I have an Empi 1 5/8" hide away muffler installed on my 1600. The sled tins fit great, no interference.

Now, after I installed the muffler, it seemed like the car was running hotter, than it did with the stock muffler with heater boxes. So, I bought an IR temperature gun and kept it in the glove box. I recorded, for over two weeks the temperature at the head, right next to the exhaust exit port. I do not remember the numbers, I would have to get back into my old notes, but the temps surprised me, I wanna say around 265. So, I fabricated some Industrial tins from a template from tS. Bolted them onto the engine and went for a drive. They do not bolt to the heads, they just rest upon them on the underside near the valve cover gasket. With the IR gun, I noted a rough 40 degrees drop on both sides, at that spot on the heads. The car no longer smelled hot or acted like it was hot. It has been a great improvement!
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Jimbo

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[yamaducci]

I just posted in my rebuild thread a few pics where I fit the sled and industrial tins around the roll cage. Which is like a header. What I did was use a hole saw to cut a hole where the tube will go through the sled tin, cleaned it up with a die grinder and then cut the tin in half across the hole with an air-hacksaw. The top part of the tin bolts to the cylinder shroud and the bottom part bolts to the case. The industrial tins bolt to the lower sled.
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[67rustavenger]

[Glenn]

[67rustavenger]