External water hoses on F1 engines

[powerabout]

Guys

I have noticed F1 engines these days put a fitting in the top of the block and run 2 hoses down into each head between 3-5 and 4-6
Is this to try to dump any air out to get a solid water flow around the cylinders ( without dropping pressure) or add a bit of cool water over 5 and 6? ( with air in it or both)

Thanks

( yes I might be going to dark side in a carby 2.5 steel sleeve on a one piece, tunnel boat)

[tlwjkw]

nice cool water flow :p.........

[powerabout]

nice cool water flow :p.........
So which of my guesses was on the money?

[John S]

Guys

I have noticed F1 engines these days put a fitting in the top of the block and run 2 hoses down into each head between 3-5 and 4-6
Is this to try to dump any air out to get a solid water flow around the cylinders ( without dropping pressure) or add a bit of cool water over 5 and 6? ( with air in it or both)

Thanks

( yes I might be going to dark side in a carby 2.5 steel sleeve on a one piece, tunnel boat)
Pics of this boat? Sounds cool.

[powerabout]

Pics of this boat? Sounds cool.
Just a collection of ex f1 and f2 tunnel boats with large gearbox pretty close to Texas F1 powerheads.
https://www.youtube.com/watch?v=rVKUqWVvxCE

(https://www.youtube.com/watch?v=rVKUqWVvxCE)

[tlwjkw]

So which of my guesses was on the money?

usually anything comin' from top of block is gonna have minute bit of air in it........

[BUZZIN' DOZEN]

https://static.wixstatic.com/media/ea3a92_ecbc50665653405e943ae24918ef0217~mv2.jpg/v1/fill/w_426,h_613,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/ea3a92_ecbc50665653405e943ae24918ef0217~mv2.jpg

[powerabout]

https://static.wixstatic.com/media/ea3a92_ecbc50665653405e943ae24918ef0217~mv2.jpg/v1/fill/w_426,h_613,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/ea3a92_ecbc50665653405e943ae24918ef0217~mv2.jpg
Thats it, what do they do, what issue did they fix?
Was it just to vent air out of the water?

[tlwjkw]

want you ta think about this... how/where could it purge any excess air?

[powerabout]

want you ta think about this... how/where could it purge any excess air?
Air in the ex trunk is removed from the highest point before it gets to the cylinders and dumped over the bottom 2 in the head
(probably should be lower down like the adapter plate?)

[tlwjkw]

right... right back into tha system............ 'bout only way air can be purged is thru tha adapter plate...

thats tha reason a hose was added down to tha poppit with tha production motors in '89.. they figured it out when tha water cooled rec/reg was over heating due ta air pockets....... worked well enough ta keep it after tha water cooled stuff went away..........

those two hoses are just for "extra coolin' water" to tha motor....

[powerabout]

right... right back into tha system............ 'bout only way air can be purged is thru tha adapter plate...
Without losing pressure that is....

[tlwjkw]

"calf rope"

[LakeFever]

A manually forced diverted flow. Adds another loop to the hottest parts of the block. Instead of relying on just rubber diverters in the cylinders to surround the cylinders this system pumps in to the center and out the top. The heat will naturally settle in the center of the block anyways so by routing the cooling this way it shoves the heat from the center out. That’s how it looks to me

[powerabout]

"calf rope"
is that Texan for the Aussie "ken oath"?

[powerabout]

A manually forced diverted flow. Adds another loop to the hottest parts of the block. Instead of relying on just rubber diverters in the cylinders to surround the cylinders this system pumps in to the center and out the top. The heat will naturally settle in the center of the block anyways so by routing the cooling this way it shoves the heat from the center out. That’s how it looks to me
Which way do you think the flow is in those hoses?

[tlwjkw]

don't know tha phrase?.. but probably tha same.. "the end"....... :reddevil:

[powerabout]

Surprised that there hasnt been more work on heads ( easy to do with a few holes in head gaskets and the head and more divertors) to alter and even up water flow around the cylinders
Merc and OMC have the old send the water in one end and out the other and hope for the best
Look at 410 sprint car and Nascar engines and they all have mods to even water flow per cylinder

[LakeFever]

Which way do you think the flow is in those hoses?

the coolant pumps up the center of the block, and up through the top cavity in the top of the exhaust divider out into the divider plate then back into the block into the cylinders as well as out of that nipple on the top of the block which feeds down to the poppet and the tell tale. The coolant goes in the block, around the cylinders, then back up into the cylinder heads. The way this extra hose mod is routed intersects here and adds more cooling to the center area of the heads by adding in that extra loop.

[powerabout]

Might make the top block exit fitting taller so it traps more air and good place to stick the timing pointer on

[racervboat]

I have them on my 280 and don't have any cooling issues.

[powerabout]

I have them on my 280 and don't have any cooling issues.
Nic or sleeved?
Seems that cooling is more of an issue with steel sleeves as in less tolerant when on a on piece

[rjdubiel]

Nic or sleeved?
Seems that cooling is more of an issue with steel sleeves as in less tolerant when on a on piece

his is all nic

[tlwjkw]

Nic or sleeved?
Seems that cooling is more of an issue with steel sleeves as in less tolerant when on a on piece

ya gotta pretty much know your beans when ya set up a steel sleeve ona one piece..... jmo

[LakeFever]

The one piece for steel sleeve motors needs to run stats and have drain holes added to the adapter plate. Quite a comprehensive thread on that topic here. The info towards the last few pages is most current

https://www.screamandfly.com/showthread.php?259723-225-promax-with-one-piece-adapter-plate

[powerabout]

The one piece for steel sleeve motors needs to run stats and have drain holes added to the adapter plate. Quite a comprehensive thread on that topic here. The info towards the last few pages is most current

https://www.screamandfly.com/showthread.php?259723-225-promax-with-one-piece-adapter-plate
Drain holes added?
They are too big now so no block pressure

[LakeFever]

It’s all in that thread how to safely adapt and what to mod

[tlwjkw]

go to john marles's website .. he explains it all and believe me he is tha man on tha steel sleeve ona one piece plate.. ya don't add holes in tha plate, ya jus change tha sizes....

US1 Mercury Outboard Race Engines and Top Pin Pistons (http://www.us1.cc/)

tha only motor ta run stats with a one piece is tha 225 PM SS.. it also uses a poppet.. its a rare piece...

[108]

The one piece for steel sleeve motors needs to run stats and have drain holes added to the adapter plate. Quite a comprehensive thread on that topic here. The info towards the last few pages is most current

https://www.screamandfly.com/showthread.php?259723-225-promax-with-one-piece-adapter-plate

No you don't. Been doing it for years.

[LakeFever]

No you don't. Been doing it for years.

seems I stand corrected then. Thank you

[powerabout]

To control cooling first you need pressure otherwise your splash feed, then go from there.
All the above confirmed what I guessed

[TripleA]

I've been wanting to do this mod to my 260. Is there any good info or details on exhaust how/where to drill and tap the heads?