Thread: 2 1/4 engine measurements needed.

The Top bolt appears to be at 12 o'clock.

The two holes on the top flange appear to be horizontal to the chassis line or perpendicular to the vertical centre line. However they are not evenly spaced from the vertical line, as the hole on the right is 1 7/16" from centre and the one on the left is 2 15/16". This is looking at it from the gearbox side.
I have taken the measurements in imperial sizes for the obvious reason that it would have been designed by that code.

Diana, these measurements were taken quickly by aligning a strait edge through centre and then coming off that with a square to get the approx dimensions that you require.
I have one of these adaptor housings sitting on the bench in the shed and if you want precise measurements let me know and I will take more care to be exact.
Hope it's of some help.


Cheers, Mick.

Thanks Mick

I also have one of the adapters in the back of the car, but need to confirm if the assumed alignment remains intact when sitting on the back of the engine. Otherwise I may end up with with the bolts a few degrees out which will rotate the entire transmission by the same degree.

What I am hoping is that someone who has a 4 cyl engine and transmission sitting in a chassis and can project the lines accurately with a straight edge and square.
(I have done the same for the 6 cyl on my SIIB.)

Would take the measurments off Emmett the gun buggy, but to get the particular measurements accurately, it also requires removal of the firewall.

Diana

just so happens I have juddies 2.25D and sIII 4speed IIA clutched box sitting on the bench at work...

pop up an image of exactly what you want measured up and I'll have a crack at it for you.

I suspect that you want the boltup pattern for the flywheel housing for both sides where it bolts to the engine and the bolt pattern for the bell housing stud holes.

Diana I have a 2A sitting here with the motor out and the front pulled off it but it has the gearbox still in it.
So I can check with a straight edge and a square to see if the top stud on the gearbox is at 12 o'clock.


Cheers, Mick.

What would be wrong with having a "slant four" in it anyway.
At least it would be unique.


Cheers, Mick.

Hi Dave

Have a few images but the SIIB is not the one I measured off.

The pen line is where (hopefully) the top stud is in the 4 cyl version.



Just reviewing my needs, the easiest way would be to scribe a line from the centre of the gear stick bracket using the bracket itself to square off and the space between the studs to arrive at the centre. It is likely the stud is the 12 O'clock, but would like confirmation.

The two studs in the 6 cyl are equi-distant from the vertical.


Not easy to see but, the 6 cyl adapter internal diameter has to be machined out 3/8" oversize. The black area is the amount that needs to be removed.



if the top stud of the 4 cyl adapter is at the vertical then the new studs will be inserted on a pitch circle 13 1/2" (5/16" larger than the original circle note black arrows) and the area around the studs built up. Except that we will build up the housing first and then machine out the internal diameter and front face.

Originally Posted by mick88

What would be wrong with having a "slant four" in it anyway.
At least it would be unique.

Cheers, Mick.

Except that it would be a slant 6, I'm fitting a 4 cyl R380 bellhousing to a Rover 6cyl, but it may give me a few mm more room in the cab!

Diana,
I just checked on a vehicle that I have the front off and the motor out of, so it's very accessible. The top centre stud hole on the gearbox bell housing is exactly perpendicular to the chassis plane.


Cheers, Mick.