Gas Springs Instead of Hood Prop Rod
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Thread: Gas Springs Instead of Hood Prop Rod

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    3000 Post Club Site Supporter P.J. Romano's Avatar
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    Gas Springs Instead of Hood Prop Rod

    Small project today, to shorten the winter day. I eliminated hood prop rod by replacing it with gas springs. Those springs are inexpensive at $17.51 each, McMaster-Carr P/N 4138T52 (40 lbs extended force). By the way, the GT radiator is not position dead in the middle. That forced me to attach left and right gas spring in slightly different way. Not a big deal, the whole project took me about 3 hours.
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    Old racers never die. They just go bench racing.

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    Bikini Inspector Frozen Tundra GT's Avatar
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    Post a video of your cool mod in operation. I was just thinking about how to do this the other day.
    Last edited by hrcollinsjr; 11-26-2018 at 10:53 PM.

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    Über Genius First opel 1981's Avatar
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    Quote Originally Posted by Frozen Tundra GT View Post
    Post a video of your cool mod in operation. I was just thinking about how to do this the other day.
    I've been contemplating it for years and never thought to connect them to the hinge itself.

    I imagine one would want to beef up the hinge to use a 40lb strut.
    Opel GTs are not GM products
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    Just Some Dude in Jersey The Scifi Guy's Avatar
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    First off, I am soooooooo jealous!


    Now a word of caution. GT hoods are pretty weak. You now have tremendous leverage being applied to the hinge and front mounting plate of the hood as you try to close the hood. You have to size the strength of the strut to not be too strong or bendage and separation of the glued/stamped together hood seams is possible. I'll just say that and sneak away to wallow in my jealousy.

    Last edited by The Scifi Guy; 11-27-2018 at 10:34 AM.

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    3000 Post Club Site Supporter P.J. Romano's Avatar
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    I found that installing greasing nipples on the hinge was excellent upgrade. It kept my hood hinges in great shape all these years.
    It is probably a good opportunity to repeat post on hood hinge repair and reinforcement.
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    Old racers never die. They just go bench racing.

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    Just Some Dude in Jersey The Scifi Guy's Avatar
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    Quote Originally Posted by P.J. Romano View Post
    (40 lbs extended force).

    Does that mean that EACH strut needs 40lbs. of force to begin collapsing? That would be 80lbs of force applied at the hood mounting plate to begin to get the hood to close. Consider that the oem set up of the hinge/hood mounting plate encounters virtually zero pounds of force when opening and closing.

    I tried this strut-to-the-hinge mod a while back, but my fiberglass hood was way too weak at the hood mounting plate to withstand that much force for very long.

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    Member ejota's Avatar
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    I really like the idea of doing this, but although my hinge has been repaired and grease fittings added, it's always in the back of my mind when I open the hood that it'll break off again.
    Last edited by ejota; 11-27-2018 at 01:53 PM.

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    3000 Post Club Site Supporter P.J. Romano's Avatar
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    I wouldn't try this on fiberglass hood although it would require much less force to keep it open. The GT hood is quite heavy and it requires 2x40 lbs springs. I initially tried 2x20 lbs springs and they could not hold the hood.
    The GT hinges are not weak; they are just prone to seize and break-off as a consequence. Well lubricated hinges should last forever.
    jlthunder and ejota like this.
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    Opeler
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    Aero style hood locks installed in 2014:
    https://www.opelgt.com/forums/group-...tml#post650570

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    And the Batterie came out now with no problems?

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    Opel Intern Swiftus's Avatar
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    The over-the-top modification to this modification would be linear electric actuators.

    Looks good PJ!
    First opel 1981 likes this.

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    Senior Contributor GoldGT's Avatar
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    Quote Originally Posted by P.J. Romano View Post
    Small project today, to shorten the winter day. I eliminated hood prop rod by replacing it with gas springs. Those springs are inexpensive at $17.51 each, McMaster-Carr P/N 4138T52 (40 lbs extended force). By the way, the GT radiator is not position dead in the middle. That forced me to attach left and right gas spring in slightly different way. Not a big deal, the whole project took me about 3 hours.
    Looks like you added a piece of steel all the way across with the ears on it to hold the gas springs next to the radiator.......yes? I am not sure I could do this due to the way my electric fan is mounted and the over sized aluminum radiator I have for the fuel injection.
    Jeff

    '73 GT,5spd,Recaro,EDIS4 2.2 EFI MegaSqrt, Ali Flywhl w/S10 Clutch, Elec Fan, Roller Rockers, Venolia Pistons, 6 Cyl Intake w/ Custom Injection, 15" Wheels,F&R Sway Bars,2" Exhaust,1" Sport Spring,Koni Reds,Wilwood Brks,3:90 Gears & Gripper LSD,Rear Disks,Ali Radiator,Hse of Colors - Kandy Pagan Gold.
    123 WHP @ 6800 RPM

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    Pedal Smasher Autoholic's Avatar
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    Cool idea. My CDO is not liking that the gas struts are not mirrored from each other. So either both struts would need to be inside the hinge, or outside the hinge. One inside and one outside....

    If you don't have CDO (OCD), then it won't bother you.
    "Autoholism is an incurable addiction medicated daily with car porn." ~Zeppi (myself)

    1973 Opel GT project car. Plans: 2.5L, Weber 38 DGAS, Getrag 240, Watts link, exterior color - Rainforest Green Pearl, interior color - tan

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    Über Genius First opel 1981's Avatar
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    Quote Originally Posted by Autoholic View Post
    Cool idea. My CDO is not liking that the gas struts are not mirrored from each other. So either both struts would need to be inside the hinge, or outside the hinge. One inside and one outside....

    If you don't have CDO (OCD), then it won't bother you.
    That would bug the carp out of me.
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    Humans are not an endangered species!
    ̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶— ̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶ ̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶ ̶̶̶—̶̶̶̶̶̶̶—̶̶̶̶̶̶̶—

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    Pedal Smasher Autoholic's Avatar
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    Quote Originally Posted by First opel 1981 View Post
    That would bug the acpr out of me.
    Fixed that for you
    opelbits and The Scifi Guy like this.
    "Autoholism is an incurable addiction medicated daily with car porn." ~Zeppi (myself)

    1973 Opel GT project car. Plans: 2.5L, Weber 38 DGAS, Getrag 240, Watts link, exterior color - Rainforest Green Pearl, interior color - tan

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    3000 Post Club Site Supporter P.J. Romano's Avatar
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    Quote Originally Posted by Autoholic View Post
    Cool idea. My CDO is not liking that the gas struts are not mirrored from each other. So either both struts would need to be inside the hinge, or outside the hinge. One inside and one outside....
    If you don't have CDO (OCD), then it won't bother you.
    Yeah, I am having sleepless nights since. Damn Opel, why did you have to install radiator off centre?
    Last edited by P.J. Romano; 11-28-2018 at 07:14 AM.
    Old racers never die. They just go bench racing.

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    3000 Post Club Site Supporter P.J. Romano's Avatar
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    Quote Originally Posted by markandson View Post
    Looks like you added a piece of steel all the way across with the ears on it to hold the gas springs next to the radiator.......yes? I am not sure I could do this due to the way my electric fan is mounted and the over sized aluminum radiator I have for the fuel injection.
    Jeff, get rid of bloody EFI and install those sexy Webers.
    Old racers never die. They just go bench racing.

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    3000 Post Club norbertone.gt371's Avatar
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    Quote Originally Posted by P.J. Romano View Post
    Jeff, get rid of bloody EFI and install those sexy Webers.
    So you can call me "Bloody Norbert" next spring!

    Btw. Those gas spring mod is a old beart.Take the Opel Rekord D Wagon trunk ones!But only one!
    They fit perfect at the place where is still the original rod!
    Last edited by norbertone.gt371; 11-28-2018 at 08:35 AM.
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    Senior Contributor GoldGT's Avatar
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    Quote Originally Posted by P.J. Romano View Post
    Jeff, get rid of bloody EFI and install those sexy Webers.
    I don't need to open my hood since my car runs so nicely on EFI so I don't need no stinkin' prop rod
    tomking, V8GT, rrossjr and 2 others like this.
    Jeff

    '73 GT,5spd,Recaro,EDIS4 2.2 EFI MegaSqrt, Ali Flywhl w/S10 Clutch, Elec Fan, Roller Rockers, Venolia Pistons, 6 Cyl Intake w/ Custom Injection, 15" Wheels,F&R Sway Bars,2" Exhaust,1" Sport Spring,Koni Reds,Wilwood Brks,3:90 Gears & Gripper LSD,Rear Disks,Ali Radiator,Hse of Colors - Kandy Pagan Gold.
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    Pedal Smasher Autoholic's Avatar
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    Quote Originally Posted by markandson View Post
    I don't need to open my hood since my car runs so nicely on EFI so I don't need no stinkin' prop rod
    Congrats, you just jinxed yourself.
    First opel 1981 likes this.
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    1973 Opel GT project car. Plans: 2.5L, Weber 38 DGAS, Getrag 240, Watts link, exterior color - Rainforest Green Pearl, interior color - tan

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