 75-76 Head question, Emission holes |
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| Teknon |
 Feb 28 2009, 05:58 PM
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#1
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The more I learn the dumber i think I am  Group: Members Posts: 357 Joined: 10-August 04 From: Denver, Colorado Member No.: 2,505 Region Association: Rocky Mountains  |
What length do the plugs have to be to cap off the emission holes.
Where does the hole go? How does one efficiently seal these off? ????Joe |
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| r_towle |
Feb 28 2009, 06:10 PM
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#2
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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1---cant remember exactly..about 2-3 inches long.
2---into the exhaust port to inject air and dilute the exhaust 3---- with a bolt..that is all I have seen aside from new heads, or welding up the hole. Rich |
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| markb |
Feb 28 2009, 07:08 PM
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#3
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914less :( Group: Members Posts: 5,449 Joined: 22-January 03 From: Nipomo, CA Member No.: 180 Region Association: Central California
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sww914 did this to my 76 2.0 motor just this week. Ask him over on Narp. He put in plugs.
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| solex |
Feb 28 2009, 07:11 PM
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#4
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Senior Member Group: Members Posts: 789 Joined: 12-January 05 From: Long Island, NY Member No.: 3,439 Region Association: North East States |
I had mine welded shut. The PO had put caps on the tubes but they pulled out of the head....
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| euro911 |
Feb 28 2009, 07:14 PM
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#5
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Retired & living the dream. God help me if I wake up! Group: Members Posts: 8,849 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California
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My '75 heads had some Allen head slugs (installed by a PO). They were only about an inch long and they took a long Allen wrench to reach them. Make sure they go in nice and tight (maybe even use a dab of blue or red loctite on the threads) ... I had one of them completely back out (IMG:style_emoticons/default/huh.gif)
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| sww914 |
Feb 28 2009, 07:15 PM
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#6
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Advanced Member Group: Members Posts: 2,439 Joined: 4-June 06 Member No.: 6,146 Region Association: None |
On Mark B's motor the threads were partially stripped on one or more of the holes so I installed 1/8" brass pipe plugs with red loctite. The 1/8" pipe threads are almost exactly the same thread pitch as the air injection tube threads and the plugs are tapered so they'll get a grip on the damaged threads and still seal. It's good enough to plug something that you don't ever want to use again.
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| Krieger |
Feb 28 2009, 10:45 PM
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#7
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Advanced Member Group: Members Posts: 4,711 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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I plugged mine a long time ago, but I believe they are the same plugs that a 911 would use. They are allen head. I got mine from Automotion. So maybe Performance Products has them.
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| Teknon |
Mar 1 2009, 11:12 AM
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#8
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The more I learn the dumber i think I am Group: Members Posts: 357 Joined: 10-August 04 From: Denver, Colorado Member No.: 2,505 Region Association: Rocky Mountains |
Well looking that over, I looked up through the exhaust port and saw where it comes into the head. Thinking the smoother the better on the exhaust side, that can't be very good. (IMG:style_emoticons/default/blink.gif) On the other hand maybe those holes can power a small turbo (IMG:style_emoticons/default/unsure.gif) Better yet a pre-heater for something. (IMG:style_emoticons/default/screwy.gif)
Any way thanks for queuing in and helping out (IMG:style_emoticons/default/smilie_pokal.gif) |
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| al weidman |
Mar 1 2009, 09:36 PM
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#9
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Al Weidman Group: Members Posts: 156 Joined: 22-February 08 From: Oroville, Ca. Member No.: 8,736 Region Association: Northern California |
sww 914 is right on for the simple fix. Those are 10mm fine threads and mine were mostly stripped. The pipe plug worked great and they are easy to get and install. I even used liquid steel when I put them in. Al. (IMG:style_emoticons/default/agree.gif)
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| Drums66 |
Mar 2 2009, 12:36 PM
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#10
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914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
I installed 1/8" brass pipe plugs with red loctite. The 1/8" pipe threads are almost exactly the same thread pitch as the air injection tube threads and the plugs are tapered so they'll get a grip on the damaged threads and still seal. It's good enough to plug something that you don't ever want to use again.
[/quote] I do/did what he said!.................although my threads were not damaged in any way........no problems yet. (IMG:style_emoticons/default/bye1.gif) |
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