71 Early Bay (formerly known as Superdry)

how does it go with the twin icts on dude ?

It is much smoother, really nice. And that bastard 'Aircooled' flat spot has gone!

Lookin goooood. ;-)

Good work Scoops, I bet your tools thought it was Christmas!! lol

Gungemyster wrote:

Good work Scoops, I bet your tools thought it was Christmas!! lol

Ouch! That's a low shot!

A quick fettle of the electrics and we're good to go!
Woo-Hoo!

scoops i would remove that fuel filter and place it under the bus above the gearbox as there dangerous in the engine bay, just trouble waiting to happen

and watch those icts for fuel leaking from the throttle shafts they all do it and some real bad!

ANDYLHAM wrote:

scoops i would remove that fuel filter and place it under the bus above the gearbox as there dangerous in the engine bay, just trouble waiting to happen

I nearly died then when I saw that filter there as well dude...
Scoops please remove it from the engine bay dude PLEASE..

Noted!

mine leaked from the throttle shafts ,but new seals cured it

i have a filter king under the rear boot floor, top filter and pressure regulator in one.

I might well down that route Dude as the oil temp sender for my Autometer gauge is in the fuel pump block off plate.

looking good pal ! not trying to piss on your fire, but how does your breather system work ? does it not throw oil mist into the air filters ?

Nor at all Mart, it's a fair enough question.
I questioned it but it correct on a more or less stock engine. One off the breather and then from the box to each of the filters. The oil mist will be minimal.

ah i see

also .....it will help the engine breath ......as the carb causes a vacuum .....its the best way to do it

if too much oil manages to get to the carbs .....the engine is fucked

Scoops has done it a right for his engine.

It's different to how mines set up as I've drilled the rocker covers to reduce condensation in the rocker covers and relieve crankcase pressure to reduce the amount of oil leaks; as my type 4 will rev to 6500 rpm.
These then go to the breather box, any condensation is evaporated back to atmosphere and any excess oil is then returned via the breather box on the top of my engine back into the engine. job done

In Scoops engine, any oil blowby and crankcase gases are vented through the breather on the oil filler and then into the breather box (any excess is then drained back down this way also). The gases are then drawn back into the engine via the vacuum created by draw through of the carbs...

(nomates will correct me if I'm wrong about the type 1 witchcraft engine details)

right ....lets just think about the two installs of breather system ....and i'm going to contradict myself here as i've had time to think about it

scoops ....breathing directly from the crank case ,via the stock system .....to the box ,then drawn in to the top of the carb air filters from the breather box



then tangos ....from the rocker covers ,and from the crank case, via the stock breather system


neither are bad installs ...however they both are not as good as you may think

I would run as tango does to be honest ....i'll tell you why now

when the engine fires ...both valves are shut ....you won't get crank case pressure going into the heads or rocker cover ,because the cam followers seal the crank case from the heads (they are like big plugs) .....so unless a valve is not seated properly you won't get any crank pressure into the rocker area .......with tangos install ,the breathing is via the stock breather system ....the condensation will go away more quickly from the rocker covers to the breather box and vent to atmosphere,but won't give any additional breathing from the crank case

with scoops install the vacuum created by the carbs is wasted ....as the breather box lid is vented .....this is because the lid has 'stand-offs ' and its vented to atmosphere ....therefore the carbs could suck air from the breather box lid vent via the sponge filter in the breather box ,directly into the carbs by passing the air filters so to vent the crank case .....you are both relying on the stock breather ...

if scoops seals the lid on his breather box ,the carbs will help the stock system ......and any condensation , will be drawn toward the breather box and into the carbs

tangos system relies on the stock breather system to breath ,but will get rid of condensation also .......and believe me , short runs ....or just firing it up on tick over to warm it up ,causes a lot of water to be formed in the rocker covers

I will add rocker cover breather's when I get the Stroker crank fitted.

Normally I would expect the breathers on a cone filter to go in from the bottom not the top so the down draught from the carb isn't drawing in from the breather
On all modern engines the crankcase breather goes to the air box on the pre filtered side

baja 69 wrote:

Normally I would expect the breathers on a cone filter to go in from the bottom not the top so the down draught from the carb isn't drawing in from the breather
On all modern engines the crankcase breather goes to the air box on the pre filtered side

I can see this working on an air box but not on K and N type filters ,as they only draw air from the sides ......scoops has the right idea .....introduce more vents from the rocker covers ......however the more tubes the messier the install .........i'd either stick with it as is ......and seal the breather box lid .....or do it how me and tango have ....get rid of the carb tubes and fit them to the rocker covers .......either way , the crank is still being relieved of pressure by the stock system

I'll seal the box for the moment.
When I'm running the 1801cc I'll replace the carb breather's with rocker cover vents.

that will work fine dude .....just don't use silicone or anything like it .....in fact you don't really need to seal it ....as the stock system will cope with loads more than a 1600cc