Space saver spare |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Space saver spare |
Montreal914 |
Aug 8 2020, 12:28 AM
Post
#1
|
Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
In the quest of increasing the space in my front trunk to integrate an oil cooler, I came across this piece of information that I thought was worth sharing.
Mercedes has been using Vredestein Space Master 165-15 collapsible spares on their smaller models like the C230 and the SLK. After looking at the pictures and comparing them to my 911 space saver on steel wheel, I think they are the exact same tires. The difference is that it is mounted on a 4.5" alloy wheel, not 5.5" like the Porsche. So, one though to gain trunk space would be to mount the space saver tire on a ~$100 4.5" Fachs from cip1. Lighter and narrower wheel, win win. The goal would still to have it laying flat for impact absorption, yet probably allowing a lower trunk floor and giving room for the front mounted cooler to vent out. Now the challenge is finding a place that will want to remove the collapsible Space Master tire and mount it on the Fachs... (IMG:style_emoticons/default/dry.gif) Below is the MBZ space saver wheel/tire. |
mepstein |
Aug 8 2020, 04:52 AM
Post
#2
|
914-6 GT in waiting Group: Members Posts: 19,142 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
I believe that the spare needs to be inflated to help with impact absorption.
|
mlindner |
Aug 8 2020, 07:04 AM
Post
#3
|
Senior Member Group: Members Posts: 1,496 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest |
Removing a space saver tire is very very very..........hard.
|
DickSteinkamp |
Aug 8 2020, 09:26 AM
Post
#4
|
Senior Member Group: Members Posts: 500 Joined: 27-February 17 From: Bellingham, WA Member No.: 20,876 Region Association: None |
|
Montreal914 |
Aug 8 2020, 09:45 AM
Post
#5
|
Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
Currently have both in hand, 911 5.5" steel rim with space saver and 986/996 skinny spare. I am studying my options as to ways fit a cooler in there yet minimize the body cutting. (IMG:style_emoticons/default/idea.gif)
Good point Mark that inflated would definitely help more the absorption. (IMG:style_emoticons/default/dry.gif) McMark's U shape ducting with flat collapsible spare in between is probably the most elegant option as recently seen in PMB Coatchwerks' orange car, but clearly involving and cutting... Trying to see what is the simplest way as my fabrication capabilities and my house garage operation are somewhat limited (IMG:style_emoticons/default/biggrin.gif). Thank you for sharing your thought... (IMG:style_emoticons/default/beerchug.gif) |
Mark Henry |
Aug 8 2020, 12:24 PM
Post
#6
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I have a 944 turbo collapsible spare, same as a steel spare but it's aluminum rim.
I haven't seen McMarks U shape ducting, but I was thinking along the same lines. Just remember the area of the exit(s) should be 2X the area of the inlet. |
Montreal914 |
Aug 8 2020, 04:28 PM
Post
#7
|
Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
Right! And i believe some later 911 also have alloy 15x5.5 with collapsible but not sure. Looking at the 4.5" Fachs, the offset makes the wheel center protrude a fair amount outward going against my goal of thinning the wheel... (IMG:style_emoticons/default/dry.gif)
So my current 3 options are: 1- 986/996 spare: 3.5",light, full diameter, inflated. Below is a mockup with a Mesa style cooler with a fan on top. The trunk floor is lower that the stock one. (IMG:style_emoticons/default/smile.gif) To achieve that, I would need to cut a ~9x9" opening in the floor though... (IMG:style_emoticons/default/sad.gif) Inlet would be front plugs. 2- 911 or alloy collapsible: 5.5", heavier than 986/996, small diameter, requires compressor. (IMG:style_emoticons/default/dry.gif) Below is the mockup using a Mercedes Diesel oil cooler, the narrower one, which fits under the arched shelf. This doesn't require any body cutting, just remove front 5 plugs and 2 rear access ports. As for area, 5 ports = 11.1 sq.in., and 2 outlet opening = 25.1 sq.in., so Ratio is good! (IMG:style_emoticons/default/smile.gif) The trunk floor is pretty much at the same position as the stock setup or even a little lower or without angle. 3- Fachs 4.5" with temporary donut (125/70-15): 4.5" anrrower than 5.5" (but center protruding), light, OD 22", inflated. Unfortunately, I don't have the wheel setup to validate this option but I think either cooler configuration could be used but there probably wouldn't be any gain in trunk space vs. option2. So, at the moment for more of a "bolt on" setup, I am leaning towards the collapsible option but I definetly need to either find an alloy collapsible spare, or find someone that can swap the tire, which as mentioned earlier, can be very difficult... (IMG:style_emoticons/default/headbang.gif) All of these options will require a custom trunk floor that would seal all around to create a plenum. Air path would be pretty turbulent compared to the beautiful work below but that would be my first step. @Mark Henry : This is McMark's setup! (IMG:style_emoticons/default/pray.gif) And this is the integration done in PMB's recent build (IMG:style_emoticons/default/pray.gif) |
PanelBilly |
Aug 8 2020, 04:49 PM
Post
#8
|
914 Guru Group: Members Posts: 5,788 Joined: 23-July 06 From: Kent, Wa Member No.: 6,488 Region Association: Pacific Northwest |
When I blew up my space saver it was all lopsided. Tried to find a replacement tire with NO LUCK. Cut the tire off and I plan to mount a traditional tire to the wheel.
|
ClayPerrine |
Aug 8 2020, 04:52 PM
Post
#9
|
Life's been good to me so far..... Group: Admin Posts: 15,368 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
When I blew up my space saver it was all lopsided. Tried to find a replacement tire with NO LUCK. Cut the tire off and I plan to mount a traditional tire to the wheel. Remember, those space-saver tires are over 30 years old. They won't be there when you need them, they are just too old to function. Go get a Boxster spare. If you have Boxster calipers, the 15 inch space saver spare won't fit anyway. |
Montreal914 |
Aug 8 2020, 05:32 PM
Post
#10
|
Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
Right!, they are old.
That is where the Mercedes C230 ones become appealing (IMG:style_emoticons/default/smile.gif) but they need to be transferred... (IMG:style_emoticons/default/dry.gif) |
914Sixer |
Aug 8 2020, 05:48 PM
Post
#11
|
914 Guru Group: Members Posts: 8,845 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
I am using 16" Boxster inflated.
|
Montreal914 |
Aug 8 2020, 06:42 PM
Post
#12
|
Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
I am using 16" Boxster inflated. Do you have a front mounted oil cooler? The 986/996 spare that I have is 17" (105/95-17) (IMG:style_emoticons/default/confused24.gif) |
JamesM |
Aug 8 2020, 06:57 PM
Post
#13
|
Senior Member Group: Members Posts: 1,875 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
I believe that the spare needs to be inflated to help with impact absorption. and also the windshield washers! (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) |
914Sixer |
Aug 8 2020, 08:06 PM
Post
#14
|
914 Guru Group: Members Posts: 8,845 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
No oil cooler.
|
Mark Henry |
Aug 9 2020, 04:11 AM
Post
#15
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
On my bug and '67 bus I have 15" rims with T125/15 temporary spares, only thing is they barely stretch fit onto a 4-1/2" rim.
They do have fake 5-bolt Fuchs that are 4-1/2" made for the Bug crowd |
Montreal914 |
Aug 9 2020, 10:24 AM
Post
#16
|
Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
On my bug and '67 bus I have 15" rims with T125/15 temporary spares, only thing is they barely stretch fit onto a 4-1/2" rim. They do have fake 5-bolt Fuchs that are 4-1/2" made for the Bug crowd That is the setup I had on my Bug 30 years ago! (IMG:style_emoticons/default/smile.gif) The 4.5" fake Fuchs from cip1 is exactly what I had in mind with a 125/70-15 for my option 3. Specs for the 125/70-15 tire is for rims 4-4.5" Picking up a free Honda donut spare today that will allow me to mock up. My only disappointment in the bug 4.5" fake Fuchs is its offset which makes the center protrude out a lot, going against my goal of thinning down the spare, but this donut would have 22" diameter probably giving enough room for a front mounted cooler while being an inflated tire. |
drem914 |
Aug 9 2020, 10:45 AM
Post
#17
|
Senior Member Group: Members Posts: 1,024 Joined: 16-May 08 From: Trabuco Canyon, CA Member No.: 9,062 Region Association: Southern California |
|
drem914 |
Aug 9 2020, 12:19 PM
Post
#18
|
Senior Member Group: Members Posts: 1,024 Joined: 16-May 08 From: Trabuco Canyon, CA Member No.: 9,062 Region Association: Southern California |
Beautiful setup |
Montreal914 |
Aug 9 2020, 01:03 PM
Post
#19
|
Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
|
porschetub |
Aug 9 2020, 02:48 PM
Post
#20
|
Advanced Member Group: Members Posts: 4,695 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Alloy spacesaver mounted in the rear of the car,have 944 air compressor but may just inflate it,I was told it came from a 964 but haven't checked the part number yet.
These wheels are pretty solid and fairly heavy but certainly lighter than the steel version,I had no choice but use the alloy one as it clears my 944T calipers. |
Lo-Fi Version | Time is now: 29th March 2024 - 06:01 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |