BELLHOUSING MGB1800 ENGINE INTO S2000 6-SPEED GEARBOX
Discussion
Merry Christmas all-
I'm in the beginning stages of putting a Honda S2000 6-speed into my cb MGB 1972 roadster.
Santa's elves didn't wait for Boxing Day; and under the tree left me a very nice and slightly used Honda S2000 6-speed gearbox.
I don't want to wait another whole year until Santa's elves return so I need to source a suitable bellhousing, presumably T9, to mate the gearbox to my 5-bearing MGB 1800cc engine (please don't ask why).
Does anyone know if this conversion has been done before, and is there a source for my needed bellhousing?
Thanks all, Lee
I'm in the beginning stages of putting a Honda S2000 6-speed into my cb MGB 1972 roadster.
Santa's elves didn't wait for Boxing Day; and under the tree left me a very nice and slightly used Honda S2000 6-speed gearbox.
I don't want to wait another whole year until Santa's elves return so I need to source a suitable bellhousing, presumably T9, to mate the gearbox to my 5-bearing MGB 1800cc engine (please don't ask why).
Does anyone know if this conversion has been done before, and is there a source for my needed bellhousing?
Thanks all, Lee
In that case you need to make sure the box will actually match the engine, I suspect you won;t have an issue actually.
Make sure the 1st motion shaft diameter is the same size or smaller than the spigot hole in the end of the crank, if it isn't then you will need to either bore the hole out or reduce the shaft size. I suspect it will be quite a bit smaller and therefore a bush will be needed.
Next see if the actual bellhousing face to end of 1st motion shaft distance is similar to the B series box.
Next job is to find a clutch plate that matches the diameter of the B flywheel and clutch pressure plate and the splines of the s2000 box.
Finally sit the actual box in place and see if you can adapt the existing backplate to fit, if not a new one is simple to make up given the simplicity of the backplate on the B-series. I really wouldn't imagine there is a bellhousing available off the shelf and I don't think it's worth the work to make one or have one made, a flat plate with holes drilled in it is a lot easier to make accurately and cheaply than a complex cast part.
Make sure the 1st motion shaft diameter is the same size or smaller than the spigot hole in the end of the crank, if it isn't then you will need to either bore the hole out or reduce the shaft size. I suspect it will be quite a bit smaller and therefore a bush will be needed.
Next see if the actual bellhousing face to end of 1st motion shaft distance is similar to the B series box.
Next job is to find a clutch plate that matches the diameter of the B flywheel and clutch pressure plate and the splines of the s2000 box.
Finally sit the actual box in place and see if you can adapt the existing backplate to fit, if not a new one is simple to make up given the simplicity of the backplate on the B-series. I really wouldn't imagine there is a bellhousing available off the shelf and I don't think it's worth the work to make one or have one made, a flat plate with holes drilled in it is a lot easier to make accurately and cheaply than a complex cast part.
Just to add, to be totally honest I would address the issues with the current box and live with it, a 4syncho overdrive box is a nice strong box (you'll never break one with a B-series) and it's very drivable in the B, if you want to make it more "sporty" a simple chop of the gearlever works wonders and will give it the notchy firm change of the s2000 box too.
Keep the s2000 box till you can afford the engine too and throw the lot together and put a worthwhile upgrade in with relative ease.
Just my 2 pence.
Keep the s2000 box till you can afford the engine too and throw the lot together and put a worthwhile upgrade in with relative ease.
Just my 2 pence.
To Yazza 54-
The first 4 forward gears of the S2000 box are extremely close to the MGB, 1st on S2000 is 3.1 to 1, 4th on the S2000 is .97 to 1, and 6th is .081 on the S2000 is probably an acceptable overdrive (3.1 to 1), and MGB 5th (.82) also the same on T9.
I think in actual driving, and careful tire size selection, the S2000 box should work out ok.
regards, Lee
The first 4 forward gears of the S2000 box are extremely close to the MGB, 1st on S2000 is 3.1 to 1, 4th on the S2000 is .97 to 1, and 6th is .081 on the S2000 is probably an acceptable overdrive (3.1 to 1), and MGB 5th (.82) also the same on T9.
I think in actual driving, and careful tire size selection, the S2000 box should work out ok.
regards, Lee
Wildoliver-
[i]Finally sit the actual box in place and see if you can adapt the existing backplate to fit, if not a new one is simple to make up given the simplicity of the backplate on the B-series. I really wouldn't imagine there is a bellhousing available off the shelf and I don't think it's worth the work to make one or have one made, a flat plate with holes drilled in it is a lot easier to make accurately and cheaply than a complex cast part.
[/quote]
I think that's the best idea this morning. I've lined up the MGB backing plate to the S2000 block, not too much difference except for the starter hole and the S2000 bell housing mounting flange holes seem easy enough to duplicate.
I'll take your advise, make a new backing plate and have the machine shop drill and tap new holes in the face of the MGB flywheel to take the S2000 pressure plate.
Regards, Lee
[i]Finally sit the actual box in place and see if you can adapt the existing backplate to fit, if not a new one is simple to make up given the simplicity of the backplate on the B-series. I really wouldn't imagine there is a bellhousing available off the shelf and I don't think it's worth the work to make one or have one made, a flat plate with holes drilled in it is a lot easier to make accurately and cheaply than a complex cast part.
[/quote]
I think that's the best idea this morning. I've lined up the MGB backing plate to the S2000 block, not too much difference except for the starter hole and the S2000 bell housing mounting flange holes seem easy enough to duplicate.
I'll take your advise, make a new backing plate and have the machine shop drill and tap new holes in the face of the MGB flywheel to take the S2000 pressure plate.
Regards, Lee
I wouldn't mess around with the flywheel Lee, provided the friction plate you use is the correct diameter and a scrapyard hunt will yield one that suits diameter and spline pattern and it's close to the same thickness then the MGB pressure plate will be fine, it's not like you need a stronger pressure plate due to fitting the s2000 engine, the engines the same as it was before so there is no need for the stronger plate.
That said it may be easier to adapt the flywheel if the s2000 clutch operating system is different to the MGB. This is where you need to use a bit of ingenuity!
That said it may be easier to adapt the flywheel if the s2000 clutch operating system is different to the MGB. This is where you need to use a bit of ingenuity!
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