Restrictor plate removal - Defender Source
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  #1  
Old October 21st, 2013, 11:50 PM
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Restrictor plate removal

Hello, I have a 1983 land rover 110 county SW with a 4 speed 3.5l v8 engine. I expected the landy to be slow when I bought it but I would prefer a bit more power. I heard that these v8s had destructor plates limiting it to 113 bhp from 134bhp. If so, how would I be able to tell and how would I be able to remove it. Thanks

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  #2  
Old October 22nd, 2013, 12:01 AM
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I believe uncle Douglas fitted an edelbrock carb and manifold to Trey's truck. Sorry I can't help on the restrictors.
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  #3  
Old October 22nd, 2013, 10:19 AM
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Quote:
Originally Posted by evilfij View Post
I believe uncle Douglas fitted an edelbrock carb and manifold to Trey's truck. Sorry I can't help on the restrictors.
did it help with the acceleration?
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  #4  
Old October 22nd, 2013, 10:29 AM
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I found no restrictor plates under Treys carbs. Yes the edlebrock manifold and carb made a huge difference for his truck. The engine was designed by GM to run with a 4bbl. The primary issue with these engines is that they are low compression.
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  #5  
Old October 22nd, 2013, 11:10 AM
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Look between the carb body and the inlet manifold, you should see the carb body-gasket- black plastic isolator - gasket and inlet manifold. if there is a extra gasket and a metal plate showing the restrictor plate is still there fitted.

But I somehow doubt it will be, as that's the first thing many people pull out. I did.
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  #6  
Old October 22nd, 2013, 11:58 AM
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I to have the edelbrock intake and a holley 4 barrel carb. Can't comment on before and after as mine came with the holley.
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Old October 23rd, 2013, 12:00 AM
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Quote:
Originally Posted by Uncle Douglas View Post
I found no restrictor plates under Treys carbs. Yes the edlebrock manifold and carb made a huge difference for his truck. The engine was designed by GM to run with a 4bbl. The primary issue with these engines is that they are low compression.
I'm pretty sure I have stromberg carbs. Do you think switching to SUs will help?
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Old October 23rd, 2013, 12:23 AM
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Also, how hard would it be to replace the intake manifold and carbs with edelbrock kit. If I were to do so, which specific parts will I need?
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Old October 23rd, 2013, 06:52 PM
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Quote:
Originally Posted by JSBriggs View Post
From the Edelbrock site: Buick/Rover 215 V8 PERFORMER ROVER (idle-5500 rpm) Designed for Rover 3500cc V8s (1968 & later) and 1961-63 Buick and Oldsmobile aluminum 215 V8s. Manifold not equipped with EGR. Will not work with OEM carburetors (except Carter AVS). Applications Part # Performer Rover (non-EGR) #2198* Carburetor Recommendations: Edelbrock Performer Series carb, 500 cfm (see Carbs & Accessories) Installation Notes: Recommended intake gasket: Fel-Pro #MS96002. Manifold height: A-5.00", B-5.92" (measured to engine block); Carb pad height: 5.46" see A/B Measurements. Port exit dimensions: .88" x 1.54". Throttle Bracket #8036 will fit and accepts GM style throttle, kickdown and cruise control cables. http://www.edelbrock.com/automotive_...ormer-v8.shtml Do some google searches as there are some various tuning tips, and also talk of running a 390 Holley instead of a 500. There are also various mods to the 500 to make it optimal. -Jeff
how does this setup stand up to off-roading. I read somewhere that because these engines have such a low compression, these carburetors can't stand up to to the reliability of a stromberg. I've considered SUs but I've heard that they are very sensitive.
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  #10  
Old October 23rd, 2013, 07:21 PM
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Edelbrock is a Weber/Carter and the modification is the installation of springs on the needle valve to prevent high angle fuel starvation.
The Holley is, well, a Holley.
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Old October 23rd, 2013, 08:06 PM
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Quote:
Originally Posted by Landyman1 View Post
how does this setup stand up to off-roading. I read somewhere that because these engines have such a low compression, these carburetors can't stand up to to the reliability of a stromberg. I've considered SUs but I've heard that they are very sensitive.
I think you already answered your own question, you are looking to replace your zenith/strombergs. Have you worked on them ? I have and I hate them. I noticed a signifigant bump in both power and economy when we switched his truck to the edlebrock setup.
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  #12  
Old October 23rd, 2013, 08:17 PM
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Quote:
Originally Posted by Uncle Douglas View Post
I think you already answered your own question, you are looking to replace your zenith/strombergs. Have you worked on them ? I have and I hate them. I noticed a signifigant bump in both power and economy when we switched his truck to the edlebrock setup.
do you off-road a lot? Have you encountered any problems?
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  #13  
Old October 23rd, 2013, 11:11 PM
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I took out the restrictors on my Stage1 and it woke the engine up. They are located under the carbs and held in place by a snap ring. They look like they have three pencil size holes in them. They're not hard to remove I did it in about 20 minutes.
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  #14  
Old October 23rd, 2013, 11:26 PM
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I have a 3.5 with the Edlebrock setup. I have off roaded a fair bit. The carb works well.

I think the restrictor plates were only a Stage One thing.
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