Factory - Rx7 Oil Cooler
03-06-08, 05:55 PM
#1
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
Factory - Rx7 Oil Cooler
I've fitted a 1990 RX7 oil cooler onto a 914.
I'm having problems getting flow.
1) I have the inlet going through on the top banjo (opposite side of thermostat)
2) I have the outlet coming through the banjo next to the thermostat.
I'm having a hard time getting flow through the cooler.
I've checked the thermostat, I've put spacers inside the plug to prop it open full time..... I've changed the inlet and outlet lines.......... still no difference.
the cooler remains cold to the touch, except around the inlet/outlet banjos, where a laser thermometer shows anywhere from 75-150
even at about 100 at the cooler, the aluminum cases read aat 200 degrees, the oil temp gauge reads at about 190......
Any HElp on this cooler would be appreciated, or links to where I can get more info on this type cooler....
I'm having problems getting flow.
1) I have the inlet going through on the top banjo (opposite side of thermostat)
2) I have the outlet coming through the banjo next to the thermostat.
I'm having a hard time getting flow through the cooler.
I've checked the thermostat, I've put spacers inside the plug to prop it open full time..... I've changed the inlet and outlet lines.......... still no difference.
the cooler remains cold to the touch, except around the inlet/outlet banjos, where a laser thermometer shows anywhere from 75-150
even at about 100 at the cooler, the aluminum cases read aat 200 degrees, the oil temp gauge reads at about 190......
Any HElp on this cooler would be appreciated, or links to where I can get more info on this type cooler....
03-06-08, 06:06 PM
#2
Sooo... It's cold to the touch, but it's 200*F ?
For lubrication system info, there should be a flow diagram here plus other info in the lubrication PDF:
http://www.teamfc3s.org/main/factory...ual/1989_1991/
For lubrication system info, there should be a flow diagram here plus other info in the lubrication PDF:
http://www.teamfc3s.org/main/factory...ual/1989_1991/
03-06-08, 06:24 PM
#3
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
Many thanks, Now I have somewhat of a view of the thermostat, the thermostat specs (opening temp) a small look inside the cooler tank.......
this is a big help!
I see the mounting direction is at an angle too -- interesting!
thanks again.
by the way, do you off hand know the oil capacity of the cooler?
I'm going to check the manual to see if I can find it...
AHHH thanks again!
this is a big help!
I see the mounting direction is at an angle too -- interesting!
thanks again.
by the way, do you off hand know the oil capacity of the cooler?
I'm going to check the manual to see if I can find it...
AHHH thanks again!
03-06-08, 06:31 PM
#4
Former Moderator. RIP Icemark.
Okay, the chamber at the end will still have flow if the oil cooler thermostat is closed.
You have the flow right, but it sounds like the oil cooler thermostat is the problem.
The end tank (where the thermostat/thermo pellet and the hoses are connected) should get hot. But unless the temp of the oil going through that area exceeds the thermopellet set point, (140-150F) the end tank is the only place you will get flow through.
The bottom hose should be feeding to the outlet on the engine. In the case of a 13B, that would be the hose connection at the back end of the motor, not the one at the front cover.
Is this a Rotary engine in the 914 or a Porsche motor?
You have the flow right, but it sounds like the oil cooler thermostat is the problem.
The end tank (where the thermostat/thermo pellet and the hoses are connected) should get hot. But unless the temp of the oil going through that area exceeds the thermopellet set point, (140-150F) the end tank is the only place you will get flow through.
The bottom hose should be feeding to the outlet on the engine. In the case of a 13B, that would be the hose connection at the back end of the motor, not the one at the front cover.
Is this a Rotary engine in the 914 or a Porsche motor?
03-06-08, 06:42 PM
#5
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
from axeldimen
Sooo... It's cold to the touch, but it's 200*F ?
from bajaporsche
yes, the oil cooler is mounted behind the top spare tire rack (this is a custom 914 rallye car)
the oil cooler must not be getting flow, and the aluminum cools off so good, I think the thermo will not trigger because the cooler itself stays cold.......
but my oil temp gauge reads 190-200...... and a lasor thermo onto the case shows over 200, and that's at 190 oil temp, with 100 degrees at the cooler
please read next post, i might have another troubleshoot angle.
Sooo... It's cold to the touch, but it's 200*F ?
from bajaporsche
yes, the oil cooler is mounted behind the top spare tire rack (this is a custom 914 rallye car)
the oil cooler must not be getting flow, and the aluminum cools off so good, I think the thermo will not trigger because the cooler itself stays cold.......
but my oil temp gauge reads 190-200...... and a lasor thermo onto the case shows over 200, and that's at 190 oil temp, with 100 degrees at the cooler
please read next post, i might have another troubleshoot angle.
03-06-08, 06:47 PM
#6
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
from icemark
Okay, the chamber at the end will still have flow if the oil cooler thermostat is closed.
You have the flow right, but it sounds like the oil cooler thermostat is the problem.
from bajaporsche
I've been testing the cooler different ways, spacers under the bottom of thee thermostat, to keep it closed (pin extended fully)...
with just the thermostat in regular.
and even put a nut and bolt through the thermo tube (smaller hole inside the tank) to make sure that thermo outlet was shut off and the oil went through the tank...
Same problems with heat.
BUT NOW, with looking at the angle note of the cooler in the spec sheet.......... the outlet hose must be pointed at least level, but shows downward oil flow.... ---
Mine outlet points straight up, in order to keep the oil cooler full.......... that might be putting too much pressure on the pump and restricitng the oil flow??????? MAYBE???????
Okay, the chamber at the end will still have flow if the oil cooler thermostat is closed.
You have the flow right, but it sounds like the oil cooler thermostat is the problem.
from bajaporsche
I've been testing the cooler different ways, spacers under the bottom of thee thermostat, to keep it closed (pin extended fully)...
with just the thermostat in regular.
and even put a nut and bolt through the thermo tube (smaller hole inside the tank) to make sure that thermo outlet was shut off and the oil went through the tank...
Same problems with heat.
BUT NOW, with looking at the angle note of the cooler in the spec sheet.......... the outlet hose must be pointed at least level, but shows downward oil flow.... ---
Mine outlet points straight up, in order to keep the oil cooler full.......... that might be putting too much pressure on the pump and restricitng the oil flow??????? MAYBE???????
03-06-08, 06:53 PM
#7
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
from iceman
The end tank (where the thermostat/thermo pellet and the hoses are connected) should get hot. But unless the temp of the oil going through that area exceeds the thermopellet set point, (140-150F) the end tank is the only place you will get flow through.
from bajaporsche
that's what i've found out so far, but I think my flow may have been restricted because the outlet hose points straight upwards until a sharp turn downwards.....
--- BUT, my other hoses go upwards to the cooler, the cooler is mounted on the roof rack........
It was showing that the thermo would open --- the oil tank on the opposite end of the inlet outlet fixtures would get hot....... but then would cool off to under about 70 degrees (by laser thermometer) and the fixture side would go up to about 135, but probably still running straight through that thermo tank.....
I'm going to change the angle of the cooler, and redirect the outlet hose in a downward direction, and then retest.
The end tank (where the thermostat/thermo pellet and the hoses are connected) should get hot. But unless the temp of the oil going through that area exceeds the thermopellet set point, (140-150F) the end tank is the only place you will get flow through.
from bajaporsche
that's what i've found out so far, but I think my flow may have been restricted because the outlet hose points straight upwards until a sharp turn downwards.....
--- BUT, my other hoses go upwards to the cooler, the cooler is mounted on the roof rack........
It was showing that the thermo would open --- the oil tank on the opposite end of the inlet outlet fixtures would get hot....... but then would cool off to under about 70 degrees (by laser thermometer) and the fixture side would go up to about 135, but probably still running straight through that thermo tank.....
I'm going to change the angle of the cooler, and redirect the outlet hose in a downward direction, and then retest.
Trending Topics
03-06-08, 06:57 PM
#8
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
from iceman
The bottom hose should be feeding to the outlet on the engine. In the case of a 13B, that would be the hose connection at the back end of the motor, not the one at the front cover.
from bajaporsche
This is where i'm having problems.......... I see the diagrams showing the inlet (to cooler) on top, and the outlet (of cooler) on the bottom....
others have told me the inlet should be on the thermostat side....
Now you say the outlet from the engine....... would the outlet from the engine --- be the inlet on the cooler?
this is placed on a type 4 914 porsche engine, rally car.
The bottom hose should be feeding to the outlet on the engine. In the case of a 13B, that would be the hose connection at the back end of the motor, not the one at the front cover.
from bajaporsche
This is where i'm having problems.......... I see the diagrams showing the inlet (to cooler) on top, and the outlet (of cooler) on the bottom....
others have told me the inlet should be on the thermostat side....
Now you say the outlet from the engine....... would the outlet from the engine --- be the inlet on the cooler?
this is placed on a type 4 914 porsche engine, rally car.
03-06-08, 06:59 PM
#9
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
does anyone know the capacity of this cooler.......... what mine shows ia about 8 to 12 fluid ounces....... that seems like it isn't enough, and that something is restricted.
I've read where this cooler holds about 1 quart of oil -- is that about right?
I've read where this cooler holds about 1 quart of oil -- is that about right?
03-06-08, 07:16 PM
#10
Former Moderator. RIP Icemark.
from iceman
The bottom hose should be feeding to the outlet on the engine. In the case of a 13B, that would be the hose connection at the back end of the motor, not the one at the front cover.
from bajaporsche
This is where i'm having problems.......... I see the diagrams showing the inlet (to cooler) on top, and the outlet (of cooler) on the bottom....
others have told me the inlet should be on the thermostat side....
Now you say the outlet from the engine....... would the outlet from the engine --- be the inlet on the cooler?
this is placed on a type 4 914 porsche engine, rally car.
The bottom hose should be feeding to the outlet on the engine. In the case of a 13B, that would be the hose connection at the back end of the motor, not the one at the front cover.
from bajaporsche
This is where i'm having problems.......... I see the diagrams showing the inlet (to cooler) on top, and the outlet (of cooler) on the bottom....
others have told me the inlet should be on the thermostat side....
Now you say the outlet from the engine....... would the outlet from the engine --- be the inlet on the cooler?
this is placed on a type 4 914 porsche engine, rally car.
Yes, the input into the oil cooler is on the top as you have described that you hooked it up. The output is the bottom (with the thermopellet). This is what goes back to the motor (and in the case of a 13B, goes to the pressure regulator and then dumped into the oil pan- hence my comment about outlet). The reason for the top in, bottom out design is that since the end tank flows no matter what temp the oil is you don't suffer a pressure loss when the thermo valve/ Thermo pellet opens or closes.
Since you have removed the thermo pellet to space it, is there anyway that you could have put the pellet in wrong? As I recall the small pin should be facing the bolt holding the valve in place.
Yes about 1 quart, and the 12 oz is about what the end tank holds
03-06-08, 07:33 PM
#11
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
from iceman
Since you have removed the thermo pellet to space it, is there anyway that you could have put the pellet in wrong? As I recall the small pin should be facing the bolt holding the valve in place.
from bajaporsche
I kept the pin at the bottom of the bolt, as the top spring (large spring) looked like it fit on the top of the thermo, around the smaller thermo post with the smaller spring around it.
from iceman
Yes about 1 quart, and the 12 oz is about what the end tank holds
from bajaporsche
That's my problem! I've tried to get access into the cooler section, but all I can get into the cooler is about 8-12 ounces....... with thermostat completely out, with cooler on it's side, with inlet/outlet tank up on top and opposite tank on the bottom (cooler off the car)
I can't find anyway to get more then 8-12 ounces into the cooler....
maybe try heating oil up to 160 degrees, then forcing it into the cooler with a hand pump (that's what I'm using now)
But that is my problem, I can't get oil into the cooler unit, past the tank.
ANY HELP on that one?
Since you have removed the thermo pellet to space it, is there anyway that you could have put the pellet in wrong? As I recall the small pin should be facing the bolt holding the valve in place.
from bajaporsche
I kept the pin at the bottom of the bolt, as the top spring (large spring) looked like it fit on the top of the thermo, around the smaller thermo post with the smaller spring around it.
from iceman
Yes about 1 quart, and the 12 oz is about what the end tank holds
from bajaporsche
That's my problem! I've tried to get access into the cooler section, but all I can get into the cooler is about 8-12 ounces....... with thermostat completely out, with cooler on it's side, with inlet/outlet tank up on top and opposite tank on the bottom (cooler off the car)
I can't find anyway to get more then 8-12 ounces into the cooler....
maybe try heating oil up to 160 degrees, then forcing it into the cooler with a hand pump (that's what I'm using now)
But that is my problem, I can't get oil into the cooler unit, past the tank.
ANY HELP on that one?
03-06-08, 08:08 PM
#13
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
from iceman
Could be that the cooler is internally blocked. Did you have it cleaned before using?
from bajaporsche
No, I bought it on ebay and it was the cleanest one I've seen....... looks like someone had it cleaned, but maybe it was uncleanable, or else they messed it up cleaning it...
any easy way to have it cleaned, besides having the tanks cut off and then re-welded back on?
Could be that the cooler is internally blocked. Did you have it cleaned before using?
from bajaporsche
No, I bought it on ebay and it was the cleanest one I've seen....... looks like someone had it cleaned, but maybe it was uncleanable, or else they messed it up cleaning it...
any easy way to have it cleaned, besides having the tanks cut off and then re-welded back on?
03-07-08, 10:54 AM
#15
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
with the help of some wd40 and a mixture of some lightweight oil, pushed through the system with forced air, many many times....... I know have the capacity of over a pint of oil into this unit....
ahhhh, I think I'm getting somewhere.
thanks for all the advice!
ahhhh, I think I'm getting somewhere.
thanks for all the advice!
03-07-08, 11:16 AM
#16
Lives on the Forum
Are you running this on a 13B engine?
If the thermo pellet removed and the hole block, it should not matter which side is the inlet / outlet.
What is the oil temp at the engine?
-Ted
If the thermo pellet removed and the hole block, it should not matter which side is the inlet / outlet.
What is the oil temp at the engine?
-Ted
03-07-08, 02:00 PM
#17
Junior Member
Thread Starter
Join Date: Mar 2008
Location: California
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
from Ted
Are you running this on a 13B engine?
bajaporsche
No it's on a 2L porsche motor.
from Ted
If the thermo pellet removed and the hole block, it should not matter which side is the inlet / outlet.
bajaporsche
that's what I was thinking, but the cooling unit was blocked, and I couldn't get flow past the themostat........ in other words with the center hole blocked, i was getting minimal flow with only 8-12 fluid ounces max. of oil....
from Ted
What is the oil temp at the engine?
bajaporsche
it goes up to about 220, then I would pull over or shut it down. Oil pressure drops to 20psi at 3,000......... with my other cooling unit I run at 180, 40 psi at 3,000.
I'm now flushing the unit from both the inlet and the outlet.
Are you running this on a 13B engine?
bajaporsche
No it's on a 2L porsche motor.
from Ted
If the thermo pellet removed and the hole block, it should not matter which side is the inlet / outlet.
bajaporsche
that's what I was thinking, but the cooling unit was blocked, and I couldn't get flow past the themostat........ in other words with the center hole blocked, i was getting minimal flow with only 8-12 fluid ounces max. of oil....
from Ted
What is the oil temp at the engine?
bajaporsche
it goes up to about 220, then I would pull over or shut it down. Oil pressure drops to 20psi at 3,000......... with my other cooling unit I run at 180, 40 psi at 3,000.
I'm now flushing the unit from both the inlet and the outlet.
Thread
Thread Starter
Forum
Replies
Last Post
