my car got much quicker today for a while...

i forgot to reconnect the hose from just above the airfilter to the rocker cover and suddenly my car was possesed, really really quick,
i found it and reconnected it and i was back 2 normal, so i took out the airfilter and give it a quick hoover and clean up, that helped,
then disconnected the air ram at the air filter box, and that helped some more,
so im thinking of rerouting the air ram, and making an extra one to fit to the bottom of the air box, not huge but to a colder air feed, near the headlights,
and a high flow filter.

am i missing something here or is that all plausible
opinions please

Sounds like its not getting the air that it needs . The gauze in the rocker cover breather blocks up with what can only be described as engine flem , this causes the crank to pressureize and pop the sump gaskets , the covers are best replaced as they cannot be cleaned properly . i wouldnt bother with any ram air device as this can make it harder for the engine to breath aswell . When was the last time it was on the rollers with a gas analyser plugged in ??

tis as clean as a whistle mate, i cleaned it last month,
that same pipe also goes to somewhere in the lower middle of the inlet manifold (the bit the throttle body joins to)
what does that pipe do?

its in next thursday,
has been stood for yr so could do with a tune methinks

thats it connected


this it it disconnected



and this is the bit that i dont know what it does(with stick)



cheers

nice pics m8 if i ever get this hood on i'll start having a poke round in there myself

TG

should be easy this time mate!!!

but can u tell me what that pipe does?

Looks like an oil breather pipe, runs from the inlet manaifold to the rocker cover.

Cheers

yeh i know that, but what does it do at the inlet manifold?

the route goes airbox-rockercover-inlet manifold, i know the roccker cover one sucks air in, so does the inletmanifold one, whats it need that air supply for?

Its not an air supply really, its a breather system. It allows the engine to vent itself of gas and pressure that builds up while running, theres a small fire valve in between the inlet to rocker and rocker to airbox hoses. May be wrong but don't think there is much else to it :dontknow:

Cheers

so when me motor came to life it must have been because of increased airflow to the air box yes?

Yes, the effect you must have got was from having an additional airflow into the intake system which bypassed the airfilter - the hose from the rocker to the airbox is on the clean side of the filter. Obviously not advisable to do as long term increases the risk of grit etc getting into the engine and causing premature wear.

Cheers

as i thought, i noticed it was too quick and had a look and reconnected it,
however it does imply that a secondary air intake wi filter would be a significant mod for not much wad

Have you tried a K&N panel filter? Fits in place of standard filter and should last forever with a clean once a year. Subtle, but does free-up breathing and gives a bit more induction roar :twisted: . There are also tricks with drilling out airboxes to increase intake, but not really up what to do.

Cheers

that is the next thing i buy, im convinced now, are they that effective for ?30+post?

the part you were pointing too is something to do with emision controll and a fuel shut off system when you let off the throttle  , the early 1600`s dont have as many stupid pipes and and bits everywhere . the later engines look like there on a life support system . have you swiss cheesed the airbox yet , for sure get a pannel filter and a rolling road session asap .  :wink:

can u put me up a pic of am early 1600 engine bay in hi res mate, theres way too many pipes goin on i agree, ive found three unneccesary ones so far. 2 leading to a idle valve/sensor, thts fitted to the drivers side bulkhead, and i can direct route this one, makes it all a bit simpler lookin.
chz

It would run faster (because there'e more air) but it would also lean out. This makes high revs, but overheats the engine, is less efficient and makes less power.

I dug out this video of a car having its mixture radically altered while running. You can hear the revs rise as the car leans out (the exhaust note also gets quieter) and a little bit of fuel goes in at one stage, richening it and lowering the revs (you can hear the fuel burn with a 'pop').

right so……
if i get a kn filter and add a cooler air supply to the 'dirty' side of the box , then i need to re adjust my mixture, ?

Your mixture is out by the sounds of things anyway . What colour is the center electrode of your spark plugs ??
Dont bother with the cold air feed , these dont do anything unless 100% air tight . Just drill the box out with some 2"-3" holes in logical places on the lower air box ( you seem like a sensable fella !! ) .
I saw a mk1 recently with a cold air feed and a drilled air box , obviously the air feed wouldnt be doing any thing with all the holes in the airbox .
The air/fuel mixture will of course have an effect on the running speed of the engine , but there are of course adjustments that will effect idle and under loaded conditions.
Im afraid that i dont have any high res pics of a 1600 lump .
there is a small diaphram looking sensor on the front of the airbox , just try disconnecting that and see how it runs . let me know what happens !
Im sure a set up and rolling road will reveal a small problem in there somewhere and a few more bhp .

I thought drilling the air box was one of those myths, which in fact doesn't add any power (and loses power once warm). Although the engine is able to draw more air in, its warm air (hot once the engine is warmed up and underbonnet temperatures have gone up) and less dense than cold air, which is supplied by the original piping from the front of the car. Anyone who comes back with dyno readings saying their car is more powerful with a drilled air box, would also have to confirm its a warmed up engine with the bonnet down during the dyno run, for me!