Trailing Arm Question ... |
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Trailing Arm Question ... |
SirAndy |
Aug 6 2005, 02:58 PM
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#1
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Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
while working on assembling my new (to me) trailing arms i noticed that on one arm there are 4 "drainholes" (for the lack of a better word) while the other one doesn't have any.
they both came of the same car and the holes do look stock ... why would one need "drainholes" on a trailing arm? if the welds are OK, there shouldn't be any water getting in there to begin with, right? btw, the one with the holes is the drivers side arm ... (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) Andy |
pete-stevers |
Aug 6 2005, 03:07 PM
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#2
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saved from fire! Group: Members Posts: 2,641 Joined: 10-October 04 From: Abbotsford,BC, Canada Member No.: 2,914 Region Association: Pacific Northwest |
it won't get wet if you keep it on jackstands..... (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
who drives in the rain anyhow? |
davep |
Aug 6 2005, 03:15 PM
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#3
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914 Historian Group: Benefactors Posts: 5,143 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
Don't know why the four holes are there. I recall most of them having holes.
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neo914-6 |
Aug 6 2005, 04:11 PM
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#4
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neo life Group: Members Posts: 5,086 Joined: 16-January 03 From: Willow Glen (San Jose) Member No.: 159 |
They are there to lighten the arm and compensate for driver weight.
(IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif) |
MattR |
Aug 6 2005, 04:13 PM
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#5
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Advanced Member Group: Members Posts: 3,279 Joined: 23-January 04 From: SF Bay Area Member No.: 1,589 Region Association: Northern California |
Is it possible one side is early and another is late? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)
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Eric_Shea |
Aug 6 2005, 05:38 PM
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#6
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Some have holes and some don't.
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cdmcse |
Aug 6 2005, 06:04 PM
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#7
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Member Group: Members Posts: 340 Joined: 17-December 04 From: Georgetown, Ky Member No.: 3,305 |
Mine were the same way, drivers side had holes passenger side didn't.
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SirAndy |
Aug 6 2005, 06:10 PM
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#8
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Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
ok, here's a WILD guess ... notice how on the drivers side, the trailing arm has an additional tab on the underside? how about the holes were added to equal out the weight? (IMG:http://www.914world.com/bbs2/html/emoticons/idea.gif) Andy |
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URY914 |
Aug 6 2005, 06:19 PM
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#9
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,614 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
Those are pre-rust holes.
The allow the early start of rust formation.(IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) P |
SLITS |
Aug 6 2005, 07:18 PM
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#10
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
If they are sealed tight, under severe stress in a corner, the box distorts and creates high pressure inside which will lead to an exploded trailing arm. The holes relieve the built up pressure to avoid a dastardly incident. (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)
this is also the fix for high altitude driving as the trailing arms were built at near sea level. |
TravisNeff |
Aug 6 2005, 10:02 PM
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#11
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914 Guru Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region |
Y'all are nuttier than squirrel turds. Everyone knows the driver side holes are to weaken the drivers side to offset the passenger side hell hole/suspension console when it rusts out and breaks.
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balljoint |
Aug 7 2005, 06:32 AM
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#12
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914 Wizard Group: Members Posts: 10,000 Joined: 6-April 04 Member No.: 1,897 Region Association: None |
I have no holes in my '71 trailing arms, but they are there in the '74.
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J P Stein |
Aug 7 2005, 06:51 AM
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#13
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
My best guess.......not as much fun as these others.
Vent holes. Prevent blow back / prevent a vacuume froming due to the heat from welding heat....just in case one of those lousy welders gets a perfect seal. Other than that, I haven' a clue. |
ChrisFoley |
Aug 7 2005, 07:15 AM
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#14
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I am Tangerine Racing Group: Members Posts: 7,925 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
Look again at the ones without holes. They may be there but plugged with putty.
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SirAndy |
Aug 7 2005, 12:32 PM
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#15
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Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
nope, they were blasted to the bare metal before the powdercoating ... no holes ... so, next stupid question then, should i drill similar holes in the 2nd trailing arm as well? (IMG:http://www.914world.com/bbs2/html/emoticons/idea.gif) Andy |
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