Outer Limits 4x4 Board

nottie wrote:Awsome Buddy
Keep us up to date as things progrese. Good to see someone fixing up somethn diffrent.

Thanks.

Actually there are a couple of funny things still; I am thinking of taking it to a good rover mech now for a once-over.

One is that if I give it a bit of throttle fairly rapidly, there is a WSSSSS sound from the air filter and a brief delay before the engine actually speeds up. A sort of lag in response to the throttle. This only happens from idle, not from a higher-than-idle engine speed.

And secondly, after revving it and then letting the throttle close, when it's winding down it is snap-crackle-and-popping out of the exhaust big time. It sounds farking cool but I don't suppose it's actually good for anything.

Could these both be related to some kind of adjustment of something? I was wondering if there is meant to be an overrun cutoff triggered by the throttle position, and some kind of throttle adjustment or something that I don't know how to do...

Also, on this:

Philip A wrote:On second thought they are injection rocker covers.

But what I said still goes. Check if there is an air inlet at the back between the V. If it is there it will have a filter on it.

If not you must have the LH rocker cover inlet open to air, through a filter.

I put a small air filter on the LH rocker cover opening, but it seems to release a fair bit of vapour. Can this be right?

Anyway, it's basically running so I am happy, but there are clearly some adjustments that still aren't 100%

snap-crackle-and-popping out of the exhaust big time. It sounds farking cool but I don't suppose it's actually good for anything

could be wrong but this usually means your exhaust is slightly oversized, ie not enough backpressure??

I put a small air filter on the LH rocker cover opening, but it seems to release a fair bit of vapour. Can this be right?

normal, run it to an oil catch can and then you have to recirculate to the intake (EPA bullshit)

hope that helps a lil

re gas from rear vent .
If you have the front pipe from the RH rocker correctly connected, there should be a vacuum in the crankcase which pulls air in from the rear rocker vent

Check again that you have one large pipe going to the throttle body, and a small pipe from a T piece going to the plenum at the LH front. this obviously is under vacuum. check that the T piece is not blocked, and that it has a pinhole in the small pipe fitting.

Throttle delay could be lots of things but sounds lean. could be the TPS is bad. Could be the MAF. Could be too much advance. Have you checked that the centrifugal advance is not sticking and oiled the felt in the middle of the shaft under the rotor? Could be an air leak after the MAF, but before the throttle. Check the joining pipe for leaks/cracks.

Regards Philip A

Philip A wrote:re gas from rear vent .
If you have the front pipe from the RH rocker correctly connected, there should be a vacuum in the crankcase which pulls air in from the rear rocker vent

Check again that you have one large pipe going to the throttle body, and a small pipe from a T piece going to the plenum at the LH front. this obviously is under vacuum. check that the T piece is not blocked, and that it has a pinhole in the small pipe fitting.

Definitely connected, but I will check whether it may be blocked.

Throttle delay could be lots of things but sounds lean. could be the TPS is bad. Could be the MAF. Could be too much advance. Have you checked that the centrifugal advance is not sticking and oiled the felt in the middle of the shaft under the rotor? Could be an air leak after the MAF, but before the throttle. Check the joining pipe for leaks/cracks.

Air leak between MAF unit and throttle body is very possible now you mention it, I will hit it with duct tape to make it definitely leak-free and take it from there.

I am pretty sure the centrifugal advance is okay, without having actually dismantled it, because I can clearly watch the timing advance with engine speed using the timing light.

Just after an opinion here, the fuel pump I took from a commodore had a regulator, which appears to be adjustable by means of a bolt, attached to it. I didn't use this and am relying on the regulator on the discovery fuel rail.

But now I think about it, if there is enough back pressure due to the size and length of the fuel return line, I might be getting too much pressure in the rail and overfuelling.

Do you think I should run both regulators or just the disco one?

chimpboy wrote:Just after an opinion here, the fuel pump I took from a commodore had a regulator, which appears to be adjustable by means of a bolt, attached to it. I didn't use this and am relying on the regulator on the discovery fuel rail.

But now I think about it, if there is enough back pressure due to the size and length of the fuel return line, I might be getting too much pressure in the rail and overfuelling.

Do you think I should run both regulators or just the disco one?

Just the disco one, i sometimes wonder if you think alittle to much

cloughy wrote:

chimpboy wrote:Just after an opinion here, the fuel pump I took from a commodore had a regulator, which appears to be adjustable by means of a bolt, attached to it. I didn't use this and am relying on the regulator on the discovery fuel rail.

But now I think about it, if there is enough back pressure due to the size and length of the fuel return line, I might be getting too much pressure in the rail and overfuelling.

Do you think I should run both regulators or just the disco one?

Just the disco one, i sometimes wonder if you think alittle to much

Hell yeah. I think way too much, it's a big problem and slows me down heaps in stuff like this. But it's necessary in other stuff I do so it's sort of a habit.

Thanks

The Disco rail may have a Schrader valve in it. If so you can check, but I think you are thinking too much.
Block the return and see what happens. If the idle changes you can be reasonable sure its OK.
Regards Philip A