removing throttle body tubes

[James]

My set are horrid and rusty and they don't seem to want to budge.

1) any tips on removing them?
2) can you get new ones? Places that make up hose connectors sell 45mm 1.5mm wall stuff with beaded ends - and it's not expensive - sounds like it will fit nicely.
3) has anyone tried to mount the plenum directly on to them? I'm guessing tolerances won't allow it

James

[Richard B]

Asked Malcolm @ prestige?

Are they just an interference fit, tried heat? Difficult to machine out, line bore?

[James]

just an interferance fit - screwdriver and bashing moved one of them about half a mm

Tried a bit of heat but not a lot - perhaps just not using a big enough hammer :-)

[Richard B]

Put it in the oven for 30 mins on Regulo 5  :P

Providing you can amicably resolve any consequential domestic crisis  :X

[James]

MMmm I might need to clean them out first... I could probably get away with it... the wife is currently suffering with the things sitting on newspaper in the living room floor.

[Jason]

I had a set where they kept falling out! A bit of epoxy cured that. I have never tried it but I think direct mounting of the plenum will foul things like choke and throttle linkages but in your inteded application that may not be an issue. Remember also that the longer the ram pipes the better the torque.

[James]

I was considering the benefits of lengthening the them... need to measure the space.

[Tim Bancroft]

James,

Have you started the Pi process?

[Greeks]

... what are you doing?

[Greeks]

... what are you doing?

[James]

keeping my brain active, improving my knowledge, having fun taking stuff apart and fabricating things

And if I'm lucky having something interesting under the bonnet

[Greeks]

Sounds like you're playing poker, too  ;D

Butchering a PI plenum for an airbox or something altogether more interesting?

[Alex]

Mmm fuel injection James by any chance?

[Greeks]

Elaborate flowerpot?

[James]

Your powers of deduction amaze me Alex.

I'm putting together all the kit - see how far I get - one step at a time. The semi genius idea is to make it for the later engines - and if I get far enough make up some stubby manifolds to fit the mk1 engine. In fact first job is to make up the later manifold face in aluminium with threads et al for a jig. Just cut a few bigger holes and some tube and the stubby manifold is half done. The only extra costing then is getting the trigger wheel on the crank pulley and a bit of fabrication materials.

I've always fancied PI - but the cost of all the bits is way more than a Megesquirt -we even have the throttle bodies ready to fit straight to the head - drill them out from 12mm to 14mm for a modern injector.

I don't want to faff about with the linkage so the cost saving is using a single throttle body on the end of the plenum (10 quid brand new k series plastic thing - yes they do have a reputation for sticking but you can get alloy versions for cheap - plus they only do that if they overhead or get abused - you can get different sizes for fine tuning that fit the same flange too). No balance issues at all then - smooth as anything as the air gets rammed down those lovely tapered throttle bodies.

[neilnaz]

James I am interested in what you are doing - so if I get this straight you are:

Running injectors into each throttle body (without throttle control) and governing throttle via the throttle body at the input to the plenum?

Running megasquirt to control it all.

So how do you balance the thing?

I am just interested.

[Jason]

In theory if you pull out the standard throttle body butterflies you don't have anything to balance.

[James]

Not just in theory but in practice :)

Neil - yes you are correct. I've removed the butterflies and shafts (and blocking them up) then controlling the air flow with a large 48mm throttle body on the plenum.

At least that's the plan... :) I've only butchered a set of throttle bodies so far...

[James]

This thing...

[Jason]

I'm watching this with interest - reminds me a need to get these parts to you :-)