Tuning Range Rover 3.9ltr V8 ?

[dbateman]

Hi Guy's and girl's .

I am new to the forum I live in Mt Isa .

I have a 1983 Range Rover classic two door with a 3.9ltr V8 that I need to tune but I cant find a online guide or tutorial about them , I am sure they are about but I just cant find them .


the engine has twin Stromberg type 175 CD-se carburettor's ? on a 3.9ltr V8 Rover engine .

I have searched I just cant find one and need to get this thing running right .

I was thinking of putting a Holly on it but I don't really want to spend two much money on it so I will just learn what I have .

Thank's Dave .

p.s I am not sure if this is the right place for this I did not see a RR section ?

[jakeslouw]

Go for a twin-choke Weber 38, it should work fine.

[dbateman]

Thanks Jake .

The problem is I need to get it running properly for the time being it is my only mode of transport at the moment .

I just need it to be reliable at the moment , it is hard to start when its hot also it will not idle properly when it's hot .

[sneezy]

Has it got oil in the dash pots?? Checked the spark plug gaps? I can't remember off the top of my head what the timing should be set at but I'd start at around 6-7 degrees btdc and see how it runs. If the carbs need adjustment you may need to see someone wuth an exhaust gas anyliser as they are a bit fiddley. I wouldn't touch mine at all.

Hope this has been of some help....

[dbateman]

Thank you sneezy it did not have oil in the dash pot's but I did top them up .

I have not checked the plug gap yet it had new plug's and leads before I got it but I will check them anyway .

I would like to take it to someone to tune it for me but everyone I have phoned say's they don't know anything about them or they are too busy so I guess I am about to learn all about Range Rover petrol V8's :)

There is no Land Rover dealer in Mt Isa the closest is Alice spring's about 600km's drive .

[It'sNotWorthComplaining!]

here's a link for SUs it might give you some insight how the dash pots work
Rover SD1 Carburetors, SU HS6 (http://www.roversd1.info/2600/carburetor.html)

[dbateman]

Thank you for the link I will have a read of it now .

[It'sNotWorthComplaining!]

Thank you for the link I will have a read of it now .
I saw you post on the mud forum, they sent you to AULRO, come on guys some one must know about these carbs, or do we all drive EFI ?

vid on youtube on how to balance by ear

Balancing twin Zenith Stromberg carburetors by ear on a TR7 - YouTube

also a pdf on the cd175
click on and download the fuel system and it will download the pdf for you
how to tune stromberg type 175 cd-se carburettor - Google Search (http://www.google.com/custom?hl=en&safe=active&client=pub-2614090756491056&channel=1650825436&cof=FORID%3A1%3BGL%3A1%3BLBGC%3A336699%3BLC%3A%230 000ff%3BVLC%3A%23663399%3BGFNT%3A%230000ff%3BGIf%3 BGIMP%3A%230000ff%3BDIV%3A%23336699%3B&num=1&ie=UTF-8&oe=UTF-8&q=how+to+tune+stromberg+type+175+cd-se+carburettor&btnG=Search)

[PhilipA]

the engine has twin Stromberg type 175 CD-se carburettor's ? on a 3.9ltr V8 Rover engine .


Could you tell us what it does that you feel is not right?ie stalls, won't idle. The more info you can give the better.

Regards Philip A

[dbateman]

Thanks for the vid and the pdf I will have a read of it .

Yes I do post on Mud glad they sent me over here .

Philip the car is hard to start when hot dose not idle properly when hot and hesitates slightly on acceleration , it seems to be running a bit rich to me .

The car has new plugs and leads that were fitted in Darwin just before I got the car .

I will be going thru all the vacuum hoses on the weekend they are looking a little old .

Dave .

[jakeslouw]

First things first: make sure the timing is set properly, and make sure all vac pipes are good.

Then try removing the air filter and indeed also the filter to carb air supply pipe, and see if your starting, idling and acceleration change.

What oil did you dump in the top of the dash-pots?

It's a pity you have Strombergs, they are a b*tch to tune compared to an SU which has an external adjuster on the main jet needle.

The stromberg metering needle is adjustable by removing the damper piston on top of the dash-pot and inserting a long thin flat-head screwdriver.

[dbateman]

I just put Cat 15w40 engine oil in the dash pot's it what I had on hand .
There was no oil in them at all . Do they normally use oil ? or could that indicate a fault ?

I will try and get a lend of timing light from someone and check my timing .


The car had been parked up for almost 12 months as well maybe it just needs to be run .

[jakeslouw]

The thicker the oil, the slower the vacuum pistons drop after a rev.

But it should work OK as long as it's not EP90.:o

Check the timing, the vacuum pipes and try starting without the airfilter. (Check for rodents in the airbox, I'm not joking......)

[Fairsky]

Hello.

From memory I recall a similar problem was due to a damaged rubber diaphragm. The Stromberg carburettor has a rubber diaphragm between the piston and body. Should the rubber diaphragm tear or perforate, then the engine will run very rich.

My suggestion is to check for a torn diaphragm, remove the top of the carburettor (four screws) and lift out the piston. The diaphragm is attached to the piston like a skirt. Any damage will quickly be evident. If okay, carefully refit the piston and sit the diaphragm back into the groove in the carburettor body, refit top and four screws.

Sorry I can't be of more help.

Regards,

Peter

[PhilipA]

From memory I recall a similar problem was due to a damaged rubber diaphragm.

With those symptoms , that is what I would look at first.
Regards Philip A

[dbateman]

Thanks guy's I will have a look at the diaphragm and replace the vac hoses .

[dbateman]

Quick update for you guy's I removed the top of the left hand carb and inspected the diaphragm it looks ok to me no obvious splits and is not brittle or perished at all however the piston look's to be slightly porous I don't know if that could cause an issue for me ?

What I found when I went to remover the top cover of the right hand carb is that someone has already been in there before me and damaged the screw heads . So I will remove the damaged screws at work tomorrow and see what I find in that carb .

Thanks again guy's .

Dave .