Thread: jet size for 101 carby

How much difference is there between the 101 and Stage 1 inlet manifold?

I have a stage 1 manifold Iains welcome to if he would like to modify that one without mucking up the 101 manifold.

to hard to type, give me a ring if you want before you start.

SU = bread and butter to me

Originally Posted by Lotz-A-Landies

How much difference is there between the 101 and Stage 1 inlet manifold?

I have a stage 1 manifold Iains welcome to if he would like to modify that one without mucking up the 101 manifold.

I don't think any modifications to manifolds are needed - as I understand (and please correct me if I am wrong) the 101 manifold will go straight onto the 4.6. As far as I am aware all the 3.5 carbie manifolds are basically the same irrespective of what car they came off.

What am I missing here??

Garry

Originally Posted by Lotz-A-Landies

How much difference is there between the 101 and Stage 1 inlet manifold?

I have a stage 1 manifold Iains welcome to if he would like to modify that one without mucking up the 101 manifold.

Stage one inlet manifold will not clear the engine cover/gearshift and the 101 inlet manifold will most likely flow more air anyhow.
I m thinking the standard carbys with the standard 101 factory jets and needles may not be too much off the mark as the bigger jugs are going to drag the fuel though the carby anyhow by breathing abit harder though the carby.
Aimost all 101s have had the jets changed from factory specs to early range rover as the 101 was set up to work hard as a gun tractor on MT80 fuel and the standard jets were very much on the rich side for civie use.

Originally Posted by garrycol

I don't think any modifications to manifolds are needed - as I understand (and please correct me if I am wrong) the 101 manifold will go straight onto the 4.6. As far as I am aware all the 3.5 carbie manifolds are basically the same irrespective of what car they came off.

What am I missing here??

Garry

I know the manifold will fit the V8 valley, I was thinking of height (which Ron101 has now answered) what I was thinking about was opening up the ports to make the manifold breathe better without changing the 101 from original.

Isn't the 4.6 and 3.5 blocks the same height? Even if different the gear lever goes between the carbies so there should be plenty of room. The issue is if the fuel injection system is used. Will still fit under the engine cover (just) but a new gear lever linking rod needs to be made that goes around the side of the plenum.

Garry

Yes the 3.5, 3.9, 4.0 and 4.6 Rover engines are all the same height and width.

Diana

Originally Posted by Lotz-A-Landies

Yes the 3.5, 3.9, 4.0 and 4.6 Rover engines are all the same height and width.

Diana

Thanks - then in that case it is as Iain is thinking - move the 3.5 inlet manifold, CD carbs, and exhaust manifolds over to the 4.6 - rejet/needle the carbs to suit the 4.6.

The actual issues are at the front of the engine - change from serpentine to V belts ???? Change the timing cover ?????? Change oil pump ????? Did the 4.6 have a dizzy??? If not how to provide ignition ???? Do you want the oil filter back in the old 3.5 101 position etc etc etc.

As you are installing a new engine do you put a passenger side engine mount on the drivers side to lower the engine on the drivers side to minimise the 101 rumble.