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Registered
Join Date: Nov 2006
Location: Los Angeles
Posts: 253
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H4 Headlight Upgrade - need someone to check their H4s ...
I installed the Bosh H4 upgrade (part#301-800-103x2) on my 89 911 cab and noticed that both lights have the same pattern on the same side. It seems that it should be different so I was wondering if someone with H4s can check and see if they have the same pattern. TIA Andrew
 
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11-01-2008, 10:44 AM
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User
Join Date: Feb 2006
Location: Oakland
Posts: 940
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Mine are like that, too.
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82 Targa |
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11-01-2008, 11:01 AM
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Happiest when Tinkering
Join Date: Jun 2007
Location: Missouri
Posts: 4,578
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H-4's are similar to my H-1's and the pattern is the same on both sides so it aims the light at the right place on the road if I am not mistaken the pattern for a RHD lens is reversed .
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" Porsche there is no substitute" I always liked that saying. Air cooled is the only way to go! 76 911 C.R.A.P. Gruppe #2 BIG time TURBO C.R.A.P. Bitz EFI/EDIS Now MegaSquirt 3 76 Blazer also restored by me |
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11-01-2008, 11:10 AM
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Formerly known as Syzygy
Join Date: Mar 2008
Location: Calgary, AB
Posts: 4,420
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Yes, the light will be aimed when on low beam down and to the right so as to not blind oncoming drivers.
I guess down and to the left when the driver is on the right hand side. -kevin
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Kevin 1987 ROW coupe, Marine blue, with a couple extra goodies. The cars we love the best are the ones with human traits, warts and all. |
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11-01-2008, 11:25 AM
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Registered
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
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Quote:
Interestingly, H5 lenses throw a completely even light pattern with no cut-off at all. If aimed correctly, you're good to go regardless of which side of the road you happen to be driving on.
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'77 S with '78 930 power and a few other things. |
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11-01-2008, 01:47 PM
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Registered
Join Date: Aug 2008
Location: Los Angeles, CA
Posts: 1,088
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Go here for aiming and a picture of the light beam
http://www.danielsternlighting.com/tech/aim/aim.html
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1988 Carrera Coupe |
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11-01-2008, 02:01 PM
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Formerly known as Syzygy
Join Date: Mar 2008
Location: Calgary, AB
Posts: 4,420
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Quote:
+1 on the Daniel Stern lighting website. Lots of info from a well informed guy. -kevin
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Kevin 1987 ROW coupe, Marine blue, with a couple extra goodies. The cars we love the best are the ones with human traits, warts and all. |
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11-01-2008, 03:09 PM
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Registered
Join Date: Nov 2006
Location: Los Angeles
Posts: 253
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Any opinions on whether to put a clear protective cover to prevent cracks? Is that overdoing it or is there a real risk of a stone chipping the lens?
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11-01-2008, 05:37 PM
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Happiest when Tinkering
Join Date: Jun 2007
Location: Missouri
Posts: 4,578
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my lens are made of quartz and have been on the car for nearly 23 years without a clear cover my thought is wrong place wrong time and that plastic will not prevent the lens from breaking.
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" Porsche there is no substitute" I always liked that saying. Air cooled is the only way to go! 76 911 C.R.A.P. Gruppe #2 BIG time TURBO C.R.A.P. Bitz EFI/EDIS Now MegaSquirt 3 76 Blazer also restored by me |
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11-01-2008, 05:44 PM
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Regis turd ab user
Join Date: Dec 2006
Location: Tacomatose, Wa USA
Posts: 1,489
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Quote:
David Here's a link http://xpel.com/products/bulk.asp Last edited by 911s55; 11-02-2008 at 10:21 AM.. |
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11-01-2008, 06:57 PM
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Registered
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
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Quote:
Which are second only to Cibie H4s, IMHO. Quote:
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'77 S with '78 930 power and a few other things. |
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11-01-2008, 10:30 PM
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