Why have a second oil cooler? Does it really matter?
07-07-2016, 11:59 PM
#16
I have put two 16 row MoCal's(FVD GT2 Kit) in the turbo and the RS clone has a factory turbo "S" secondary oil cooler. My 77' that has a 98'Vram in it is cooled by Elephant Racing's dual fender setup with finned oil lines.
In May 2004 Excellence magazine had a question in the Tech Notes section named "993 Valve Guide Problem"(starts on page 18). In their answer they stated "The blockage usually consists of coked oil residue." They go on to state " Most of the cases have occurred in the warmer climates, when the cars also have a lot of city driving.These conditions produce extra heat and can create the right conditions to overheat the engine's oil in this area and then cause the coking." Reading this and living in South Florida I asked my mechanic what can be done to help prevent this problem. He proceeded to tell me that installing a secondary oil cooler was the best option. That is when I had the extra coolers installed.The RS clone now has 60k more miles(88k total milage)on it and no CEL issues. Four months ago I had Dan Jacobs pull the engine for a plethora of work I wanted done.I asked him to do a leak down test at that time to see what condition the internals were in.The results were amazing. Cyl 1- 2% Cyl 2- 1% Cyl 3-1% Cyl 4-2% Cyl 5-1% Cyl 6- 0%. I believe keeping the oil from ever getting over 200deg is the reason I have such a strong running CEL free 993. I am a firm believer in the benefits of a secondary oil cooler.The proof is in the pudding.
In May 2004 Excellence magazine had a question in the Tech Notes section named "993 Valve Guide Problem"(starts on page 18). In their answer they stated "The blockage usually consists of coked oil residue." They go on to state " Most of the cases have occurred in the warmer climates, when the cars also have a lot of city driving.These conditions produce extra heat and can create the right conditions to overheat the engine's oil in this area and then cause the coking." Reading this and living in South Florida I asked my mechanic what can be done to help prevent this problem. He proceeded to tell me that installing a secondary oil cooler was the best option. That is when I had the extra coolers installed.The RS clone now has 60k more miles(88k total milage)on it and no CEL issues. Four months ago I had Dan Jacobs pull the engine for a plethora of work I wanted done.I asked him to do a leak down test at that time to see what condition the internals were in.The results were amazing. Cyl 1- 2% Cyl 2- 1% Cyl 3-1% Cyl 4-2% Cyl 5-1% Cyl 6- 0%. I believe keeping the oil from ever getting over 200deg is the reason I have such a strong running CEL free 993. I am a firm believer in the benefits of a secondary oil cooler.The proof is in the pudding.
Thanks!
07-08-2016, 01:56 AM
#17
Rennlist Member
Thread Starter
No CEL
87,000 miles, no CEL...with stock mufflers and a stock cat putting out 260 HP to the rear wheels....loving my Ruf cooler, and ever grateful to Viper Bob for installing it, back in the day.
07-09-2016, 12:13 AM
#20
I'm in Phoenix and felt it was a worthwhile addition. For those of you familiar, there is a brutal climb north of Phoenix (I-17) that claims all sorts of cars in the heat of summer. The Turbo S cooler made a difference on that hill as well.
07-09-2016, 01:14 PM
#21
Rennlist Member
Thread Starter
Revision to my original post where I indicated...
The Turbo S cooler just didn't make much of a difference in my situation...its surface area pales by comparison with the Ruf, Cargraphics too. But if the Turbo S cooler works in Phoenix, great.
"I have a RLC datas logger that monitors oil temperature and oil pressure. When the oil temp gets to my pre-set initial warning temp, the digital oil temp read out numbers turn red...when the #'s go critical (I believe I have set 260 Degrees F as critical), the dash goes red...thankfully I have only seen my stage one pre-set of 220 once."
OK, that was in 2008...since then RLC (Thankfully) has gone belly up. If ant company deserved it, they did. Customer support was non-existent. I got rid of the RLC, a bit before this blessing (Their failure) occurred, about $0.20 on the $1.00. Since then I have had several data loggers, and now have the AiM MXL-2. It is programmed for the dash display to go red,
at temps > 220 degrees F. Since I wrote the original post in 2008, I have yet to see 220, and I do track the car in hot conditions, Thunderhill in August (Never again), talk about hot! In addition Willow Springs and AutoClub California Speedway, bloody hot in the summer months. And lastly, when coming off the track, I usually do a few treks around the parking lot to let the engine and brakes cool down a bit.
Sorry about the mini-hi-jack.
"I have a RLC datas logger that monitors oil temperature and oil pressure. When the oil temp gets to my pre-set initial warning temp, the digital oil temp read out numbers turn red...when the #'s go critical (I believe I have set 260 Degrees F as critical), the dash goes red...thankfully I have only seen my stage one pre-set of 220 once."
OK, that was in 2008...since then RLC (Thankfully) has gone belly up. If ant company deserved it, they did. Customer support was non-existent. I got rid of the RLC, a bit before this blessing (Their failure) occurred, about $0.20 on the $1.00. Since then I have had several data loggers, and now have the AiM MXL-2. It is programmed for the dash display to go red,
at temps > 220 degrees F. Since I wrote the original post in 2008, I have yet to see 220, and I do track the car in hot conditions, Thunderhill in August (Never again), talk about hot! In addition Willow Springs and AutoClub California Speedway, bloody hot in the summer months. And lastly, when coming off the track, I usually do a few treks around the parking lot to let the engine and brakes cool down a bit.
Sorry about the mini-hi-jack.
07-09-2016, 04:20 PM
#22
No, this is incorrect. The only thing that will prevent the SAI ports from getting clogged and triggering a CEL is correctly-fitted valve guides. Lots of discussion in the archives on this.
07-10-2016, 01:54 PM
#23
Addict
Rennlist Member
Rennlist Member
Join Date: Aug 2003
Location: Raleigh, NC & North Myrtle Beach, SC
Posts: 4,146
Likes: 0
Received 2 Likes
on
2 Posts
I installed the Cargrafic extra cooler on my car when I bought it. It has worked flawlessly. My temp gauge never goes over 9PM even on the hottest humid days or sitting in traffic. I highly recommend it. Heat will ruin an engine quickly.
04-21-2017, 01:49 AM
#24
Rennlist Member
Join Date: Feb 2009
Location: Los Angeles & Central Coast CA.
Posts: 228
Likes: 0
Received 10 Likes
on
6 Posts
For street use you 99% probably won't nee a second cooler, for track use you 95% probably will need one
You can use a second stock one behind or replacing the A/C condenser but the stock ones are a bit harder to plumb because the I/O ports are on the top.
Ruf/Cargraphic/FVD all sell a kit that was developed for the Cup/RSR race cars, there are 2 versions on has a wider mount for use w/ A/C the other is designed to be used w/o A/C, the A/C unit can also be used w/o A/C
Here is the kit
mounted w/ A/C
having the I/O ports in front makes it much easier to plumb
oe unit
You can use a second stock one behind or replacing the A/C condenser but the stock ones are a bit harder to plumb because the I/O ports are on the top.
Ruf/Cargraphic/FVD all sell a kit that was developed for the Cup/RSR race cars, there are 2 versions on has a wider mount for use w/ A/C the other is designed to be used w/o A/C, the A/C unit can also be used w/o A/C
Here is the kit
mounted w/ A/C
having the I/O ports in front makes it much easier to plumb
oe unit
Will this aux oil cooler work on a Tip car with A/C also?
Thanks,
Dave
04-21-2017, 10:03 AM
#25
I'm not at all familiar w/ tip equipped cars but I would guess that the answer is yes. The tips has it's trans cooler sandwiched w/ the engine oil cooler in the right front fender area, that leaves the left side the same as m/t w/ just the AC condenser, This is where the second engine oil cooler would be sandwiched.
