Fuel tank breathing with ICT's

Hi ,I have fitted ICT's to my 1800 (type 4) and was wondering what others have done in regards to connecting up the fuel tank breathing system ? This is from the overhead T-piece to the airfilter housing . Was thinking of just tapping the top of the filter housing with a 90 degree NPT fitting and then just some hose to the T-piece .

 

I have mine venting to atmosphere outside of the engine compartment connected from the t piece.

Running same engine and carbs.

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Into a filter.

 

though the battery tray to atmosphere

 

My oil breather goes into the right-hand filter via a plastic elbow and the fuel vapour into the left. I superglued the internal nut to stop it going anywhere.

 

As above worth supergluing the backnut of the fitting to stop it working loose and being sucked in. I have gone one step further now I’ve installed twin 40’s and put a small oil catch tank in the breather line to the airfilter. It’s just to stop any oily gloop from the breather sitting on top of the carb inlet.

 

Yes, I've put a catch tank in the breather line to the Dellorto FRDs

 

Crankcase breather to the right filter, fuel tank to the left. No locknuts on the elbows – they can’t unscrew – no catch tank and no gloop after ten years.

We do enough damage at the best of times but if you care, even just a little, about the environment don’t vent raw fuel and oil fumes direct to atmosphere.

 

There is always conflicting information on this.

I had my fuel tank venting to my Webber 32/36 before I swapped to ICT's and was told strictly no venting into the filter.



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Whoever told you that was wrong. Venting fuel fumes to atmosphere is damaging; just one tank won’t make much difference but thousands will and it’s easy to connect it to the filter so why not?

 

Well I won't name them as it was via the forum.



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I'm bad. I vent the fuel tank to a filter but the crankcase to the road, but I can't feel it chuff on the back of my hand so I'm not exactly puking out crap (Type-4). If I was, the exhaust it right in the firing line and there isn't a mark on it.

If this was not the case I'd plumb it into the other filter. My previous (T1 stroker) engine the breather chuffed like a steam train. Perhaps relative case volumes comes into play as chuffing seems to be more a type-1 engine thing? I proved to myself with tiny pieces of tissue that it was sucking as much as it was blowing.

 

That’s passive venting, positive venting to the air-filter is better for the engine (and the environment). The small vacuum helps draw the fumes out of the crankcase reducing the oil contamination from blow-by; but you know that, so why vent to the road?

 

Convenience.

 

Love these forums ! great load of feedback and thanks to everyone who has contributed . ICT's seem to be a popular choice especially for the type 4 engine and with all this info all the little glitches and installation issues could all be ironed out by Late Bay members . I just need to find a suitable union to tap into the air filter housing .

 

i drilled a hole through mine and added lock wire, won't fall off but remains removable if needed.


Breather by Rob E, on Flickr

 

Any chance of a picture of the top fitting please . For the engine breather I am going to go for a 3/8 NPT union (as pictured below ) with a 90 degree bend with a barbed tail for the 13mm hose but struggling to find a 1/8 0r 1/16 NPT equivalent for the tank breather hose . Fitting these type of fitting that I tapered the tighten up with needing any nuts or securing devices.

 

This is what I am looking for but smaller for the fuel tank breather hose .

 

here's what the top looks like:


Breather by Rob E, on Flickr