coolant flow direction - RX7Club.com

Log In 


coolant flow direction

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 08-22-09, 08:38 PM   #1
water jacket mod??!
5 Year Member
Thread Starter
iTrader: (20)
 
gkarmadi's Avatar
 

Join Date: Nov 2004
Location: Ontario
Posts: 1,431
coolant flow direction

Does anyone knows if coolant flows from the top to the bottom of the rad or vice versa?? And if you have an aftermarket oil cooler (shape like a radiator), is it better mounted infront of the rad (between fmic and radiator) or behind the rad (between rad and electric fan)?
gkarmadi is offline   Reply With Quote
Old 08-22-09, 08:44 PM   #2
Eats, Sleeps, Dreams Rotary
iTrader: (5)
 
jackhild59's Avatar
 

Join Date: Apr 2005
Location: And the horse he rode in on...
Posts: 3,706
Top to bottom on a stock or aftermarket rad with the stock arrangement.

You really shouldn't replace the stock oil cooler with aftermarket. The FC oil cooler is far more capable than anything you can fit in. BUT that said, the aftermarket oil cooler would go in front of the rad, behind the FMIC.
jackhild59 is offline   Reply With Quote
Old 08-22-09, 08:50 PM   #3
water jacket mod??!
5 Year Member
Thread Starter
iTrader: (20)
 
gkarmadi's Avatar
 

Join Date: Nov 2004
Location: Ontario
Posts: 1,431
Holly Joker, thanks for the reply (that's answer it)
gkarmadi is offline   Reply With Quote
Old 08-22-09, 09:35 PM   #4
RX-7 restoration guy
5 Year Member
iTrader: (91)
 
mazdaverx713b's Avatar
 

Join Date: Oct 2003
Location: Vermilion Ohio
Posts: 14,750
the coolant flows from the bottom to the top. the hot coolant let into the radiator from the lower hose is cooled by the radiator and is waiting to enter a warm engine. the thermostat opens and allows the "cooled" coolant into the engine to cool it and shuts once the engine temps are under the t-stat temperature. the cycle is them repeated. the coolant is circulated by the waterpump.
mazdaverx713b is offline   Reply With Quote
Old 08-22-09, 10:21 PM   #5
Cake or Death?
5 Year Member
iTrader: (2)
 
clokker's Avatar
 

Join Date: Jan 2007
Location: Mile High
Posts: 9,541
Quote:
Originally Posted by mazdaverx713b View Post
the coolant flows from the bottom to the top. the hot coolant let into the radiator from the lower hose is cooled by the radiator and is waiting to enter a warm engine. the thermostat opens and allows the "cooled" coolant into the engine to cool it and shuts once the engine temps are under the t-stat temperature. the cycle is them repeated. the coolant is circulated by the waterpump.
Except for "the coolant is circulated by the waterpump" part, this is entirely incorrect.

From the FSM:
clokker is offline   Reply With Quote
Old 08-22-09, 11:14 PM   #6
water jacket mod??!
5 Year Member
Thread Starter
iTrader: (20)
 
gkarmadi's Avatar
 

Join Date: Nov 2004
Location: Ontario
Posts: 1,431
what's that point "B" on your diagaram?? ^^^
gkarmadi is offline   Reply With Quote
Old 08-23-09, 12:05 AM   #7
water jacket mod??!
5 Year Member
Thread Starter
iTrader: (20)
 
gkarmadi's Avatar
 

Join Date: Nov 2004
Location: Ontario
Posts: 1,431
Clokker, thanks for the diagram.. Do you (or anyone) also have diagram for coolant flow for stock turbo system and heater system??
gkarmadi is offline   Reply With Quote
Old 08-23-09, 05:25 AM   #8
RX-7 restoration guy
5 Year Member
iTrader: (91)
 
mazdaverx713b's Avatar
 

Join Date: Oct 2003
Location: Vermilion Ohio
Posts: 14,750
its the same regardless of turbo or non turbo. i'd been drinking last night and was all mixed up. forgive me for that (no more drunken posting for me lol).

but as you can see from the diagram coolant is flowing from the radiator which is the coolant that has been lowered in temperature by the passing air through the radiator then flowing through the lower hose and then through the engine. when the engine reaches the temperature of the thermostat, the wax inside melts and the thermostat opens, allowing the "hot" coolant into the radiator to be lowered in temperature and it then closes when cooler engine temps are reached and the cycle is then repeated.
mazdaverx713b is offline   Reply With Quote
Old 08-23-09, 07:47 AM   #9
Cake or Death?
5 Year Member
iTrader: (2)
 
clokker's Avatar
 

Join Date: Jan 2007
Location: Mile High
Posts: 9,541
Quote:
Originally Posted by gkarmadi View Post
what's that point "B" on your diagaram?? ^^^
Looks like the coolant return nipple from the stock turbo.
clokker is offline   Reply With Quote
Old 08-23-09, 09:34 AM   #10
rotorhead
10 Year Member
iTrader: (3)
 
arghx's Avatar
 

Join Date: Aug 2004
Location: cold
Posts: 14,874
Yes you can see that there is essentially a coolant feed and coolant return port on the front iron where the water pump housing attaches. The one closest to the driver's side is the "feed" side that pumps the lower temperature engine coolant from the radiator into the combustion area by the spark plugs. As the coolant passes through the engine it picks up more heat. So as it hits the front rotor it picks up a bunch of heat from the combustion process and begins to lose efficiency.

So you have hotter coolant hitting the sparkplug/combustion area on the rear rotor than the sparkplug area on the front rotor due to prior heat transfer. Surely this contributes to the hotter exhaust temperatures that are typically found on the rear rotor under load. The rear rotor runs at least 100 F hotter than the front (depending on where the measurement's taken, AFR, timing, etc) based on my thermocouple readings. This design of the cooling system has got to be a major reason why the rear rotor blows more often than the front.
arghx is offline   Reply With Quote
Old 10-28-09, 10:19 AM   #11
Junior Member
 

Join Date: Jun 2009
Location: Knightdale, NC
Posts: 18
O'kay, I have a 20b and according to some folks the water flows in the opposite direction. Does anybody know the flow direction for each of the different engine versions of the 13 and 20b?
dandevin is offline   Reply With Quote
Old 10-28-09, 10:42 AM   #12
Manual Rack
10 Year Member
iTrader: (50)
 
FelixIsGod29X's Avatar
 

Join Date: Aug 2005
Location: Long Island, NY
Posts: 3,646
The 13b and 20b water pumps both rotate the same direction. All mazda rotarys spin clockwise, i assume the flow is going to be the same also. (flow into the bottom hose and out the upper rad hose)
FelixIsGod29X is offline   Reply With Quote
Old 10-30-09, 08:00 PM   #13
Junior Member
 

Join Date: Jun 2009
Location: Knightdale, NC
Posts: 18
water flow

But the diagram shows the water flowing into the top of the radiator and out the bottom doesn't it?
dandevin is offline   Reply With Quote
Old 10-30-09, 08:59 PM   #14
HAILERS
10 Year Member
 

Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Quote:
Originally Posted by dandevin View Post
But the diagram shows the water flowing into the top of the radiator and out the bottom doesn't it?
Yes, from the engine thru the top hose on the radiator.......thru the radiator......out the bottom hose........into the water pump housing..................ah just follow the arrows in the pictures.

Diagrams shows what *B* is.
Attached Thumbnails
coolant flow direction-bee.jpg  
HAILERS is offline   Reply With Quote
Old 10-31-09, 01:24 AM   #15
Senior Member
5 Year Member
 

Join Date: Sep 2002
Location: PA
Posts: 270
I dont mean to hijack but I have a related question.

For those who remove ther heater core....what would the best way to rout the coolant commng out of the engine that would normally go to the core? I contemplated rigging some sort of small radiator to mount at the rear bottom of the bay and ductign seom air through it. Would the collant flow through by its self or would it need an electric pump? And finally where is the best location to rout it back to the engine?
osiris7442 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
hogged out vs boost prepped (Nikki) Jeff20B 1st Generation Specific (1979-1985) 66 05-13-16 05:41 PM
East Coast Tuning Session #2 with "thewird (SPRING 2016!) HalifaxFD Canadian Forum 126 05-09-16 07:06 PM
[For Sale] Scratch & Dent, Used, and Open-Box Sale! SBGarage Vendor Classifieds 3 10-30-15 04:13 PM
[For Sale] 1993 Mazda RX7 SUPER CLEAN Ron Dane 3rd Generation RX-7 (1993-2002) Vehicles 13 09-30-15 07:17 PM
93 FD Touring Coolant leak and smoke near turbo ZaqAtaq New Member RX-7 Technical 2 09-05-15 08:57 PM


Tags
13b, 80, bottom, coolant, diagram, direction, engine, flow, flows, mod, past, photos, plug, radiator, rx7, spark, throught, top

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 02:51 PM.


All content Copyright 2007 by Internet Brands, Inc.