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Phill

Triumph ITB conversion

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On 10/26/2018 at 5:13 AM, Busybee said:

Filter foams on the trumpets? 

C2943119-B411-4E1B-A4C2-3F10EE9166E5.jpeg

wow, any more pics of this car?

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Linkages in. By luck more than judgement (and a fair bit of tweaking) the full motion of the arm on the linkage plate equates to butterflies fully open :D

IMG_20181207_122318.thumb.jpg.bc071f61f7ce6b4109779aef8d5fb870.jpg

I was hoping my fuel hose would arrive today but it hasn't so I am getting on with my new filter housings. I established that the filters IB have are for 1600 escort so should be fine.

Also my ICV vacuum hose arrived but it was too large so that has gone back for a smaller size.

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This is all looking mighty fine - all the planning and hard work will be worth it soon!

Do the butterflies on the left and right open at the same rate?

Maybee a deceptive photo but the link arm operating the left bank looks to be at a different angle to the RHS arm. 

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Thank you, I hope so!

Yes, the butterflies open at the same rate and yes the arms are at different angles. This is really annoying because I was at great pains to design the bracket etc so they would be at the same angle but it hasn't worked out. Frustrating :( Still, it works so that is the main thing.

As I posted my last post the doorbell rang and there was the postman with my fuel hose. I have trial fitted it and because I am doing it the proper way, as above, there is not enough hose so another order going in, typical :rolleyes: Plus I'm not happy with a couple of the connections. The Triumph fuel rails have a different size spigot at each end so I am going to have to step from 10mm to 8mm. The same at the FPR which has 8mm spigots as well. Frustrating :glare:

What is getting me though is how some guys make their engine bays look so "empty". Every time I add something else along with it's associated clips etc it gets more and more cluttered. Also frustrating :angry:

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7 minutes ago, Phill said:

 

What is getting me though is how some guys make their engine bays look so "empty". Every time I add something else along with it's associated clips etc it gets more and more cluttered. Also frustrating :angry:

That is very difficult to do, and comes with its own compromises. also don't forget that alot evolve over time.

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Looks great :ani_clapping:

One thought I just had looking at that picture - your cross frame for the throttle linkage (the black aluminium 'X') is tying the two sets of throttle bodies together. I'm just wondering how this will cope with the thermal expansion across the engine as it warms and cools - i.e. when the heads move apart from each other - you could end up with some force going into the throttle assemblies, or the frame might fracture. I'd be tempted to build in some minimal compliance at the fixings either end - this could be just elongating the holes in the frame by ~0.5mm each and then using bellville type washers under the nyloc nuts.

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4 minutes ago, MaxDiesel said:

Looks great :ani_clapping:

One thought I just had looking at that picture - your cross frame for the throttle linkage (the black aluminium 'X') is tying the two sets of throttle bodies together. I'm just wondering how this will cope with the thermal expansion across the engine as it warms and cools - i.e. when the heads move apart from each other - you could end up with some force going into the throttle assemblies, or the frame might fracture. I'd be tempted to build in some minimal compliance at the fixings either end - this could be just elongating the holes in the frame by ~0.5mm each and then using bellville type washers under the nyloc nuts.

Do you think there will be that much expansion? If I loosen the X then it won't be as rigid and there will be flex in the linkages as they move. However, any expansion may be compensated by the expansion in the X itself, as the engine bay warms up, as it is made of aluminium.

 

11 minutes ago, andy121 said:

That is very difficult to do, and comes with its own compromises. also don't forget that alot evolve over time.

True. It may well be that I end up redoing some of the wiring to "hide" it after its all running properly.

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26 minutes ago, Phill said:

 

Yes, the butterflies open at the same rate and yes the arms are at different angles. This is really annoying because I was at great pains to design the bracket etc so they would be at the same angle but it hasn't worked out. Frustrating :( Still, it works so that is the main thing.

 

Worth checking this. If the fulcrum is equal and the arms are set at different angles something is going to be out of balance. 

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I have checked it over and over and it seems fine. The ClosedCourseMotorsport setup is the same (which is why I didn't copy it, hey ho...........)

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1 hour ago, Phill said:

Do you think there will be that much expansion? If I loosen the X then it won't be as rigid and there will be flex in the linkages as they move. However, any expansion may be compensated by the expansion in the X itself, as the engine bay warms up, as it is made of aluminium.

Not sure how much expansion there will be - but there'll definitely be some and it could generate some significant forces. I think this is why the inlet manifolds always tend to have a rubber union somewhere between the two sides - the 3.2 manifold is a good example.

If it was me - I'd keep the fixing holes for the x-frame tight on one side - make that your reference for positioning and set up. Then make the holes on the other side slightly oversize - using something like a belleville washer would keep this side tightly secured but hopefully allow some movement as things expand and contract (they're unlikely to do this uniformly).

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I wouldn’t like the idea of tight one side, bit looser on the other. Elongated mounting holes for the x frame or if it’s a serious issue (which I can’t see as everything will be expanding), corrugations in all x frame arms to take up any movement. VVVV type of thing. So the movement flattens the V’s. Can the x frame be insulated a bit where it mounts to the throttle bodies? 

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25 minutes ago, Busybee said:

I wouldn’t like the idea of tight one side, bit looser on the other. Elongated mounting holes for the x frame or if it’s a serious issue (which I can’t see as everything will be expanding), corrugations in all x frame arms to take up any movement. VVVV type of thing. So the movement flattens the V’s. Can the x frame be insulated a bit where it mounts to the throttle bodies? 

I'm wasn't really suggesting one side would be loose - it would still be a torqued up nut on the side with the slightly enlarged holes (by say +0.5 or +1mm). By using the right type of washer you can maintain a pre-load that should allow some slippage if required. I'd be concerned the X frame will fracture prematurely after a being stretched and and compressed a few times - even if its only by a fraction of a millimetre.

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While I ponder the above expansion issues I have trial fitted my "home built by Phil (for the second time)" air filters. Some cleaning and painting and they are ready to go.

I will be making rain covers for the grille ends - watch this space.

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I am really going to have to get that fan cleaned :o

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