For the K series experts...

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freebiker

freebiker

Well-Known Member
Posts
2,815
Location
Rebel County, Ireland
I've finally got my direct to head throttle bodies. In very good condition, and look like they'd be ready to fit straight on.

Just a few things i'm unsure about.

When i remove my original intake manifold etc, i'm going to be left with quite a few pipes with nowhere to go. The main one is the breather pipes that come out of the rocker cover, is it best to block them off or put some sort of filter on them (allowing them to still 'breathe')?

Coolant pipes should be ok, there are the necessary connectors for them. Injecters are all in place, should just need plugging in. Butterflys are all linked up ready to go and just needs the cabled popping in and fuel rail looks good. Also, what i think is the throttle position sensor is in place, and the wires just need connecting.

Is there anything i'm missing here? If i start to do the job will i come across something else i need or something i've overlooked such as sensors etc. Also, how do it set the idle position of the butterflys? is it something i'll need to do on the cable?

First time doing anything like this, so a little nervous to say the least.
 
if you block the rocker cover breather you will cause back pressure and stand the chance of oil being blown out the dip stick,fumes from this normally draw in to inlet manifold
 
Can't answer any specific K series points freebiker but regarding the breather pipes you can't block them you will need to connect to a catch tank with a filtered vent to atmosphere. It should have decent capacity and a sight tube to view the oil level to minimise the frequency of draining.

Throttle butterflies will depend on their linkages. Without seeing them, before fitting I imagine they will each have to be zeroed so that they close completely ie. no light passing through at edges. Then each opened an identical amount (the minimum amount required for idle?) in a way that they always remain balanced.
 
Cheers for the reply guys.

I've had a search on the internet for fitting DTH TB's to the K and not really came up with much apart from the attached pictures.

It looks like one of the outlets from the rocker cover is blocked off (with a bolt in the line), while the other has a pipe leading to the airbox. How exactly would this work?

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The blowby gasses from the crankcase are full of oil vapour so they can't be fed directly into the airbox they'll just wet the filter. In the first pic you can't tell where the pipe goes, it could pass below the air box maybe to a catch tank.
Second pic I suspect is of an engine with breather pipe or system removed and would not be left like this during use or there would be oil everywhere.
 
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I guess its a case of rigging something up along the lines of an older engine design where the vent was taken out of the rocker cover and usually fitted with a wire gauze filter within the rocker cover or connection. Then the pipe was just routed to the external air.

Many component suppliers sell catch tanks (as mentioned above) for this purpose.
 
Crewey's well on his way to 180 horses. You'll be fine, just bolt it on and connect.

In your pics, there are standard 1.8 rocker cover and VVC cover

I take it, there is an air temp sensor on the TB backplate? In which case one breather will be used

Get into the tuning section, should make interesting browsing Caterham Throttle Bodies - MG-Rover.org Forums

Someone has 200 horses in an MGB :eek:
 
Cheers for the replies guys.

Not sure if there is an air temp sensor on the TB, will have to look. But i know for a fact there is the mesh guaze in the rocker cover, on both channels of the breather pipes.

just another thing, i've bought a new intake manifold gasket today so i'm ready to fit. However the rubber in the gasket is very very thick, and how are you meant to make sure it sits in the right place as you're putting the bodies on? I also got a paper style gasket in the same packet.
 
Happy days, you're home in a boat, maybe someday I'll stretch the budget and get some trumpets myself :D

We'll expect some Youtube clips of you diffing on some fresh green grass, preferably golf courses
 
Beast o Bodmin said:
so how much power then boyo......

i can drift the defender on dry tarmac but it fooks the tyres quick....
Click to expand...

I've no idea how much power to be honest. I reckon it'll put out around 140bhp with the throttle bodies and exhaust, once i upgrade the ECU that should get it upto 150 approx and then when i upgrade my cams possibly 165? Could go even more if i swap for a VVC head with fixed cams as the valves are larger. Not sure if i want to go that far though. might start stripping it out for light weight after that.

Why on earth would you drift a defender on dry tarmac? Wouldn't that **** your diffs annorl?

Snow drifting is the best :D
 
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Ok, so i bit the bullet and went ahead and started fitting the TB's. Managed to use my old fuel rail and injectors and have got the TPS sensor, air sensor, coolant pipe, fuel pipe and accelerator cable all connected OK. Have managed to set the idle ok and she runs quite well (apart from a few now noticable exhaust leaks :doh:... wasn't leaking before so proves they pull a lot more air through).

I've still got three pipes disconnected. These all seem to be vacuum pipes, the most important one being the brake booster. She's heavy to stop without the brake booster so would like to connect this up again. Looks like i'm going to have to tap a hole into one of the throttles behind the butterfly and connect there.

The other two pipes i'm unsure about. They both lead into a black cylindrical box on the right hand side of the engine bay which also has a fuel line going into it (i'm thinking it has the vacuum for the fuel tank as well). I'm sure i've read N.I. say people remove this little box altogeter but what would the effects of removing it be and what would happen to the fuel vacuum line?
 
I am not certain but that box sounds like a charcoal canister that stores up petrol fumes then vents them back into the inlet manifold, if so, just leave it disconnected and plug the line from the fuel tank.
 
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