Water Jacket Tube

hudsonguy · February 2006

I was wondering if anyone could help me determine the differences between the brass water jacket tube on the early 262's and the later 308's. I know they are interchangeable. I'm pretty sure there were additional holes added, so I was contemplating doing this to my early tube to provide better cooling.

The early tube had a series of 1/4" and 3/8" round holes along the top of the 'curved' side. These lined up pretty much with the areas in between the valves. There were also six long slots along the top fold line. About all I know for sure about the 308 tubes is that there were holes on the 'flat' side.

Could I simply add some holes to the 'flat' side to accomplish the same thing as replacing it with a newer one?

Thanks as always,

Doug

super651 · February 2006

hudsonguy wrote:

I was wondering if anyone could help me determine the differences between the brass water jacket tube on the early 262's and the later 308's. I know they are interchangeable. I'm pretty sure there were additional holes added, so I was contemplating doing this to my early tube to provide better cooling.

The early tube had a series of 1/4" and 3/8" round holes along the top of the 'curved' side. These lined up pretty much with the areas in between the valves. There were also six long slots along the top fold line. About all I know for sure about the 308 tubes is that there were holes on the 'flat' side.

Could I simply add some holes to the 'flat' side to accomplish the same thing as replacing it with a newer one?

Thanks as always,

Doug

Doug, the 55-56 has the most holes in it for more water flow. I dont have a picture of one as i have it in my 51 Super ( maby others could send pics )

I think they have at least 2-more towards the #1-2-3 cyl.

As you know,very little flow gets to the core-plug side and the proof is seen in older engines as drop-out will build up to the top of the core plug holes.

We have found out over the years of Drag racing and with the help of Steve Kann of Salt Flats Hudsoning ( 1954 Hornet) that the water pump will flow more at high speeds than the DEFLECTOR tube can handle due to hole restricting, ( the coolant will then cavitate and the temp will rise.due to air in the coolant)

Steve added a tube to the high side of the water-pump to the core plug side and piped flow to the outside of core plugs. This will cool any Hudson down as it flows more coolant to the Hot Side in the Cyl. bores.

Hope this helps. I am going to try this on my Super Hot 318 engine that I am building. Hudsonly Rudy.

Steve Kann

1239 23 rd ave.

Longview Wa 98632

dwardo99 · February 2006

Any way you could post a diagram of this? I'm having trouble imagining it.

[Deleted User] · February 2006

Really interesting information.

Rudy, I would sure like to know more about your Hot builds. I'm in the process of a 358 stroker myself. Debating compression ratios and cooling even now.

Mark

super651 · February 2006

`Hudsonator wrote:

Really interesting information.

Rudy, I would sure like to know more about your Hot builds. I'm in the process of a 358 stroker myself. Debating compression ratios and cooling even now.

Mark

I will take some pictures this weekend of a hudson water pump where the HIGH-PRESSURE port is drilled. ( the pump will be apart to show the axact point to drill the take off hole to accept a 3/4 pipe elbow.

I drill a 1/8 pipe tap hole just below the core plug bore in the THICK Boss area on the side of the block. ( this area is all around the core bore) drill at all core plug locations. ( at the #6 pm ) This will help feed a small amount of coolant to the cylinder sides and up to the cyl.head.

You can use steel line or rubber hose to make the connection from the High Pressure elbow to the first plug,then a t-fitting from it to the #2 plug t-fitting and then to an elbow in the last plug.

( Steve Kann and a few others removed all 3 core-plugs then made 3 alum. adaptors with o-rings to press into the core bores,and drilled 3/8 pipe holes in the centers to connect the pump lines to them )

If you have a copy of the W.T.N. Jan-Feb. volume 34/#3 look on page 16-17-18 showing the Pink Fabulous Hudson Hornet on the front cover .

This is where this modified coolant flow was used in testing at the Bonneville Salt Flats.

If you care to get more info than i give please call Steve at 360-636 4035

he will be most helpfull. Hudsonly Rudy.

Will have some pictures by this weekend.

dwardo99 · February 2006

Thanks so much! Inquiring minds want to know.

[Deleted User] · February 2006

Rudy,

Thanks for the information, its much appreciated. I'll be eagerly awaiting the pictures of your water pump high pressure port.

I'm looking forward to being able to put one of your "powered by Hudson" stickers in my window. I would sure like to hear more of your tech regarding hot hudsons.

thanks again,

Mark

hudsonguy · February 2006

Just wanted to reiterate my first question.

Could anyone tell me the modifications one could do to an early 262 Water Jacket Tube to increase the flow, as was done by the Hudson factory a few years later?

Does anyone have a spare 308 tube they'd like to sell? Does anyone have a 308 tube they could take a picture of?

Thanks,

Doug

[Deleted User] · February 2006

I have one out of a 308 I am rebuilding I will take some digital pics and send to you.

hudsonguy · February 2006

51hornetA,

I appreciate it. If you could just note the approximate size and location of the holes, along with the picture, I'd be much obliged.

[Deleted User] · February 2006

hey Hudsonguy I took some pictures and threw in a rough diagram for you. Posted on my website in the parts gallery. Pics are high resolution so you can blow them up quite a bit. Did not show Slots on top in diagram but from pics you should be able to figure it out.

Hope it helps.

http://www.hudsonmotorcar.org/coppermine/thumbnails/album=16.html

hudsonguy · February 2006

51hornetA,

Thanks a million. You put some time into that, and I truly appreciate it. It looks like there are quite a few little differences between them. I printed out your pictures and diagram, and I'll compare it to my tube tonight. Thanks again.

Hudsonly,

Doug

super651 · February 2006

hudsonguy wrote:

I was wondering if anyone could help me determine the differences between the brass water jacket tube on the early 262's and the later 308's. I know they are interchangeable. I'm pretty sure there were additional holes added, so I was contemplating doing this to my early tube to provide better cooling.

The early tube had a series of 1/4" and 3/8" round holes along the top of the 'curved' side. These lined up pretty much with the areas in between the valves. There were also six long slots along the top fold line. About all I know for sure about the 308 tubes is that there were holes on the 'flat' side.

Could I simply add some holes to the 'flat' side to accomplish the same thing as replacing it with a newer one?

Thanks as always,

Doug

Doug, It took me a while to get all the info togather on the 1955-56 Brass manifold that you had asked for. I had to do some testing with that manifold before i could get back with you. In a few days with the help of Ken Cates and his Web-Site I will have two articles with pictures of both article on the 55-56 DEFLECTOR MANIFOLD and the other one on MODIFYING THE HUDSON STEPDOWN ENGINES COOLING.

The deflector manifold one is ready now with pictures and if you will send me your e-mail add. I will send you a copy of it.

Hudsonly Rudy

Water Jacket Tube

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