Cooling with stock center risers

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steves86ta

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« on: May 07, 2013, 03:06:08 PM »
Hi Guys

When i get my new miotor built and put in i plan on converting to Center risers and through hull exhause. I bought a set of mercruiser center riser manifolds last night and I am now trying to figure out how to plumb them.

My current setup is the stock mercruiser 228 Log setup.

My question is can i just buy a typical "4" port marine thermostat housing and hook this up to these stock "dry-joint" manifolds?

If so does anyone have a diagram?

Any help anyone can provide would be great.

Thank you
Steve
1980 Bahner 21' Mini Day
1968 Rogers project



GT Jets

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« Reply #1 on: May 16, 2013, 11:25:25 PM »
Hi Guys

When i get my new miotor built and put in i plan on converting to Center risers and through hull exhause. I bought a set of mercruiser center riser manifolds last night and I am now trying to figure out how to plumb them.

My current setup is the stock mercruiser 228 Log setup.

My question is can i just buy a typical "4" port marine thermostat housing and hook this up to these stock "dry-joint" manifolds?

If so does anyone have a diagram?

Any help anyone can provide would be great.

Thank you
Steve

Tell me more about your set up...

If you are talking about the aluminum deal designed for a jet, then I would try to steer you away from that kit...

You have the block mounted water pump (automotive one) correct?

The original stat housing will work from the 228, but the newer style would be better IMHO, Do you have any pictures of this thing?

I am fairly certain I have what you need in the shop.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

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« Reply #2 on: May 17, 2013, 12:57:06 PM »
Hi GT,

I have been doing research and i think i have come up to one of two solutions

Heres a pic of the manifolds i have


Heres a better pic from the internet


From the research i have done it looks like i ultimately have two options, one is to run "cold manifolds" the other is for "warm manifolds".

Here are some pictures with the cooling paths,

STOCK


"WARM"


"COLD"



Im leaning towards going with the "cold" set-up. any reasons that i shouldnt? Any other suggestions you want to make?

Heres a picture of my stock setup as well



Also, it sounds like you have a few parts lying around, i am searching for the stuff to do my "Thru-hull" conversion. It looks like i will need 4 90* elbows, some 4" rubber and steel tubing and of course tips. Do you have anything lying around you might be interested in selling?

Thanks again!
Steve
1980 Bahner 21' Mini Day
1968 Rogers project

ka0tyk

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« Reply #3 on: May 17, 2013, 01:14:32 PM »
you need to make sure you have a "block off plate" which blocks flow from the manifold to the riser... reason being is that you'll want to suck cold water in from outside (or from the pump) go thru the exhaust manifolds to pre-heat.  then go into the block.  then out of the block you want to go to the riser and then out the back of the exhaust.  the block off plate seperates the manifold from the riser.  the stock mercruiser manifolds have water passages that link them together. 


steves86ta

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« Reply #4 on: May 18, 2013, 11:13:08 AM »
you need to make sure you have a "block off plate" which blocks flow from the manifold to the riser... reason being is that you'll want to suck cold water in from outside (or from the pump) go thru the exhaust manifolds to pre-heat.  then go into the block.  then out of the block you want to go to the riser and then out the back of the exhaust.  the block off plate seperates the manifold from the riser.  the stock mercruiser manifolds have water passages that link them together. 



Thanks Kayotk!

It appears that if i do the "cold manifold" option i will need the free flow gaskets. Otherwise ill have to get the block off plates.

thanks
Steve
1980 Bahner 21' Mini Day
1968 Rogers project

 


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