Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Post Reply
 
LinkBack Thread Tools Display Modes
Old 12-07-2005, 07:36 PM   #1
Registered User
 
Rail26's Avatar
 
Join Date: Jun 2005
Location: El Paso
Posts: 1,147
20 degree difference?

986's operate at 195 deg oil temp.

987's operate at 175 deg oil temp.

Why the 20 deg difference? I bet Toolpants or Brucelee has an answer for this one.

__________________
'05 987 Basalt Black/Sand Beige
5 spd, 18" wheels
AH-64 Apache
RC-12 Guardrail
RC-7 Crazy Hawk

"If the wings are traveling faster than
the fuselage, it's probably a helicopter--
and therefore, unsafe" --Unknown
Rail26 is offline   Reply With Quote
Old 12-07-2005, 07:53 PM   #2
Registered User
 
Join Date: Nov 2003
Location: Illinois
Posts: 3,033
My 986 operates at 180-185. Maybe some 986's run around 195 certainly not all of them.
__________________
'03 3.2L GuardsRed/Blk/Blk---6Spd
Options: Litronics, 18" Carrera lights, Bose sound, Painted to match roll bars.
http://i100.photobucket.com/albums/m...Mautocross.jpg
Adam is offline   Reply With Quote
Old 12-08-2005, 05:34 AM   #3
Registered User
 
Brucelee's Avatar
 
Join Date: Jun 2004
Location: Des Moines, IA
Posts: 8,083
No diffect insight but a theory.

Emissions are impacted by operating temp. My guess is the lower temp related to that.

Second theory is engine life. The engineers may have decided the engine would be happier at the lower temp.

Last theory is both of the above.

Bueller, Bueller?
Brucelee is offline   Reply With Quote
Old 12-08-2005, 08:48 AM   #4
Registered User
 
Join Date: Apr 2005
Location: South Carolina
Posts: 435
I feel a marketing urge coming on to offer an oil cooler upgrade for 986's...
limoncello is offline   Reply With Quote
Old 12-08-2005, 09:34 AM   #5
Registered User
 
Join Date: Jun 2005
Location: San Diego, California
Posts: 874
Short answer...improved cooling system. Long answer:

The new Boxster retains the familiar cross-flow cylinder head cooling system from the first Boxster for efficient and even distribution of coolant to all cylinders. The water pump, now a carry over part with the new 911 Carrera/S, ensures a higher coolant flow rate. The Boxster and Boxster S versions with manual gearbox are fitted with two radiator modules located as before in the wings ahead of the front wheels. These have been increased both in area (approx. 5 %) and depth (approx. 20 %) and are identical with the radiator modules of the new 911 Carrera/S. The two more powerful electric fans also feature automatic requirement-driven control and a modified air flow concept.This ensures an optimised air flow and an aerodynamically optimised cooling-air system. This new feature permits infinite control of the fan speed as a function of the coolant temperature and the system pressure in the air conditioning system instead of two-stage control. It has the advantage of requiring less current and therefore creates less of a load on the vehicle electrical system as well as being less noisy. The new line layouts for the radiator in the front end and the reworking of the radiator connections have reduced the sensitivity of the new Boxster models to damage and hence reduced repair costs. The use of cost-effective brackets with desired break points prevents the radiator module being damaged in a slight collision, for example. When it comes to repair, the damaged plastic carriers can be replaced and the radiator module re-mounted. Furthermore the use of quick couplings throughout the cooling system pipework has reduced the amount of repair work required in the event of damage, again resulting in lower repair costs. On the Boxster S with Tiptronic S, an additional third radiator is used in the front end of the vehicle to facilitate cooling of the automatic transmission oil via an additional oil-water heat exchanger in the common water circuit. The improvement in the efficiency of the water-cooling system means that the smaller oil/water heat exchanger (engine-oil cooling) of the 2.7 litre engine can now also be used in the 3.2 litre engine, which has resulted in a reduction in weight of 360 g/0.79 lbs.
__________________
http://i7.tinypic.com/24ovngk.jpghttp://i7.tinypic.com/24ow0id.jpg

06 987S- Sold
Carrara White / Black / Black/Stone Grey Two-tone

05 987 5-speed - Sold
Midnight Blue Metallic / Metropol Blue / Sand Beige

06 MB SLK350- Lease escapee
Iridium Silver Metallic / Black

We've heard that a million monkeys at a million keyboards could produce the complete works of Shakespeare; now, thanks to the Internet, we know that is not true. - Robert Wilensky
SD987 is offline   Reply With Quote
Old 12-08-2005, 09:40 AM   #6
bmussatti
Guest
 
Posts: n/a
Does the 987 or the 987S have an oil cooler?
  Reply With Quote
Old 12-08-2005, 09:45 AM   #7
Registered User
 
Join Date: Jun 2005
Location: San Diego, California
Posts: 874
"The improvement in the efficiency of the water-cooling system means that the smaller oil/water heat exchanger (engine-oil cooling) of the 2.7 litre engine can now also be used in the 3.2 litre engine."
__________________
http://i7.tinypic.com/24ovngk.jpghttp://i7.tinypic.com/24ow0id.jpg

06 987S- Sold
Carrara White / Black / Black/Stone Grey Two-tone

05 987 5-speed - Sold
Midnight Blue Metallic / Metropol Blue / Sand Beige

06 MB SLK350- Lease escapee
Iridium Silver Metallic / Black

We've heard that a million monkeys at a million keyboards could produce the complete works of Shakespeare; now, thanks to the Internet, we know that is not true. - Robert Wilensky
SD987 is offline   Reply With Quote
Old 12-08-2005, 08:46 PM   #8
Registered User
 
Join Date: Nov 2003
Location: Illinois
Posts: 3,033
Quote:
Originally Posted by SD987
On the Boxster S with Tiptronic S, an additional third radiator is used in the front end of the vehicle to facilitate cooling of the automatic transmission oil via an additional oil-water heat exchanger in the common water circuit. .
Actually, I think all 986 S models have a center mounted radiator to help cool off the larger 3.2L, but I don't doubt that it is used in cooling of the Tip trans.
__________________
'03 3.2L GuardsRed/Blk/Blk---6Spd
Options: Litronics, 18" Carrera lights, Bose sound, Painted to match roll bars.
http://i100.photobucket.com/albums/m...Mautocross.jpg
Adam is offline   Reply With Quote
Old 12-10-2005, 07:26 PM   #9
Registered User
 
deliriousga's Avatar
 
Join Date: Jun 2005
Location: USA!!
Posts: 1,159
Part of it is probably the oil weight. The 986 was originally spec'ed with 10W40 and ok to use 15W40 in warmer climates. The 987 is spec'ed with 0W40. Even though they changed the oil spec for all models to 0W40, most 986's are still running the heavier weight oil. In ours, when we switched from 10W40 to 15W50, the engine running temp rose about 15F.

__________________
1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
deliriousga is offline   Reply With Quote
Post Reply


Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 07:13 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page