smog pump delete 1976 2.0 cali car |
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smog pump delete 1976 2.0 cali car |
dax1969 |
Dec 14 2017, 07:08 AM
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#1
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Member Group: Members Posts: 360 Joined: 10-March 14 From: belgium Member No.: 17,103 Region Association: None |
Hi guys,
Tried the search option but can't find what I'm looking for. I know that the Cali 1976 914 2.0 has a smog pump/system to pass emission test. If such a system is not needed in your area, would you remove it or leave in place ? Will you gain more power without this system ? If you remove the pump should you only block of the lines with caps you can buy at AA or else or are there any other modifications needed ? Other exhaust ? thks yr advise krgds Dax |
914Sixer |
Dec 14 2017, 08:13 AM
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#2
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914 Guru Group: Members Posts: 8,870 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
All 75-76 have the smog pump and air injection system. I removed mine because it restricts the horsepower. You can cap the injection tubes. Remove all the plumbing and pump. Pump has a fan hub shaft at fails and there are no replacements at this time. Exhaust is also restrictive. Best to backdate to 73-74 exhaust. Late exhaust tend to fall apart. By removing all of that stuff you should be able to gain about 7 hp.
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76-914 |
Dec 14 2017, 08:35 AM
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#3
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,490 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
True except the earlier heat exchangers are difficult to find and the ones on a 75-76 are most likely in good condition. I mention this only because you need good heat in Belgium. the plugs you need are std SAE pipe fittings and can be sources from most anywhere. (IMG:style_emoticons/default/beerchug.gif)
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McMark |
Dec 14 2017, 08:38 AM
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#4
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
If you don't need it, you can feel free to remove it.
I don't see a profound difference between with or without from a performance perspective. The system pumps extra air into the exhaust to help burn any excess fuel while traveling down the exhaust pipe. This all happens after normal combustion, and so the pump doesn't interfere with or alter the way the engine runs. The only draw on the system is to run the pump. I have a hard time believing that a well maintained and smooth turning pump takes up 7hp, but I don't have any contrary data to support that. Regardless, that's all you're saving -- a minute amount of power to run the pump. Leave it. Remove it. Either way won't make much difference. The process for plugging the ports in the heads is well documented in the search. |
914Sixer |
Dec 14 2017, 09:27 AM
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#5
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914 Guru Group: Members Posts: 8,870 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
McMark,
Just going by factory specs, 73-74 2.0 made 95 hp and the 75-76 only made 88 hp. |
Beebo Kanelle |
Dec 14 2017, 10:29 AM
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#6
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Member Group: Members Posts: 248 Joined: 22-November 12 From: Houston, Texas Member No.: 15,177 Region Association: Southwest Region |
is the smog pump a rotary vane pump?
I've always thought about utilizing the smog pump to draw about 10" of crankcase vacuum. Has anybody else thought about this? |
914Sixer |
Dec 14 2017, 10:39 AM
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#7
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914 Guru Group: Members Posts: 8,870 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
FYI, there is a NOS smog pump over on theSamba.com $225.
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McMark |
Dec 14 2017, 11:34 AM
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#8
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
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oakdalecurtis |
Dec 14 2017, 11:47 AM
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#9
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Oakdalecurtis Group: Members Posts: 1,323 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California |
Hypothetically speaking, you could just loosen the smog pump swing bolt, reach in and remove the belt driving the smog pump, and leave everything else intact. That would give you all the "extra' horsepower lost by the engine from turning the smog pump while also saving wear and tear on the smog pump belt drive pulley on the front of the engine. Plus, you have the added advantage that if you ever wanted to restore the smog system for any reason, you just put the belt back on.
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dax1969 |
Dec 14 2017, 12:08 PM
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#10
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Member Group: Members Posts: 360 Joined: 10-March 14 From: belgium Member No.: 17,103 Region Association: None |
Hypothetically speaking, you could just loosen the smog pump swing bolt, reach in and remove the belt driving the smog pump, and leave everything else intact. That would give you all the "extra' horsepower lost by the engine from turning the smog pump while also saving wear and tear on the smog pump belt drive pulley on the front of the engine. Plus, you have the added advantage that if you ever wanted to restore the smog system for any reason, you just put the belt back on. Not a bad idea although we don’t need it here. If lights and brakes are working you pass tecnical inspection and get an O licenceplate |
shelby/914 |
Dec 14 2017, 01:25 PM
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#11
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Senior Member Group: Members Posts: 804 Joined: 24-August 05 From: Foxfield, Co Member No.: 4,655 Region Association: Rocky Mountains |
I also have a '76 which the previous owner removed all of the smog equipment. He left the air injection tubes in place and used brass caps and JB weld to plug them. Eventually one of the tubes blew out of the head taking all of the threads with it. I replaced the heads with a set of rebuilt '74s since it had previously blown a spark plug out on the other head which had to be helicoiled. Currently running '73/4 style SSI exhaust which seems to make a big difference. It also has Euro flat top pistons. Good luck.
Dan |
VaccaRabite |
Dec 14 2017, 01:27 PM
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#12
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En Garde! Group: Admin Posts: 13,423 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Remove the belt, but also cap off the ports at the heads.
Backdate the exhaust. Will need earlier style heat exchangers and muffler. That way you are retaining heat, finding lost HP, and can still easily bring up back to 75/76 stock with only an afternoons work. Zach |
914werke |
Dec 14 2017, 05:34 PM
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#13
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"I got blisters on me fingers" Group: Members Posts: 9,999 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest |
Remove the belt, but also cap off the ports at the heads. Backdate the exhaust. Will need earlier style heat exchangers and muffler. ...& air guide tin and hanger and j tubes and ....ect. (IMG:style_emoticons/default/smile.gif) |
burton73 |
Dec 14 2017, 05:44 PM
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#14
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burton73 Group: Members Posts: 3,493 Joined: 2-January 07 From: Los Angeles Member No.: 7,414 Region Association: Southern California |
This would be the 76 original paint car owned by me. Leamon changed out the broken smog pump and special Crank bracket for pulley for my car a couple of months ago and was driving it pretty hard. I have video that he texted me saying it runs great and he think he will just keep it! I tried to put it on here but could not get it to open
I personally could not find that it was any slower with the pump on of off as to the power. Not on a dynamometer but on my seat/butt dynamometer. A picture from Lemons place. Bob B (IMG:style_emoticons/default/driving-girl.gif) |
mepstein |
Dec 14 2017, 05:46 PM
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#15
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914-6 GT in waiting Group: Members Posts: 19,238 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Remove the belt, but also cap off the ports at the heads. Backdate the exhaust. Will need earlier style heat exchangers and muffler. ...& air guide tin and hanger and j tubes and ....ect. (IMG:style_emoticons/default/smile.gif) early cable |
Elliot Cannon |
Dec 14 2017, 06:03 PM
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#16
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None |
914's in Cali? https://en.wikipedia.org/wiki/Cali
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Dave_Darling |
Dec 14 2017, 07:28 PM
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#17
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914 Idiot Group: Members Posts: 14,981 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Note that you will want to spin the smog pump periodically to keep from rusting up. Spraying some oil in there when you do it might not hurt either!
--DD |
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