B230 onto an M41 Gearbox

DJS · Jul 9th, 2013, 15:58

Hi All,

Does anybody know about bolting a B230 up to an M41 gearbox?

I know that the sump, oil pump and pick up need to be changed for B20 items. The sump fitted without incident. I will look at the pick up and oil pump very soon.

The bell housing has the same bolt pattern (B20 at least) and lines up nicely. I'm just not sure about the gearbox input shaft, clutch plate etc.

Has anybody done this conversion?

Any advice welcome.

Cheers,

Darren.

classicswede · Jul 9th, 2013, 18:24

You will need a B21/23 or 8 bolt B20 flywheel and use the standard clutch. It does all line up and work out fine.

940_Turbo · Jul 9th, 2013, 18:50

Could have phrased this better....

The clutch for an early 240 is common with both 120 and 140. You can use either use a flat flywheel, or use a dog dish with an M47 cover plate and an early 240/Amazon/140 friction plate. It makes no odds whether the M41 is late or early, the input shaft remained the same.

Providing you install the B230 upright the M41 will sit level. Volvo did make a bell housing to fit an m40 or 41 to a slant mounted B21, found in 1975 240 only.

DJS · Jul 9th, 2013, 21:16

Thanks for the replies gents.
I'm probably going to end up buying a special flywheel if I can't find a standard flat one.
I'll look for the other bits and see what this is like in the engine bay.
I think that the turbo manifold and turbo should sit in the engine bay without any modification to the inner wing, which will be great. I just need to think about the plenum side.
Any more advice most welcome.
Cheers,
Darren.

john h · Jul 10th, 2013, 06:09

Please post some photos of your conversion; very interesting!

Will the M41 handle the torque of a turbo B230? (Volvo upgraded the gearbox to M400/410 for the 164).

John

DJS · Jul 10th, 2013, 10:36

Hi,,

Ok, I will put up some pictures when I drop the engine in.

I don't think that the M40 / 41 will take the power for long if I don't look after it.

The idea is to put the engine in and get it running with an aftermarket ECU etc. When it is running ok and I am happy with it I will then think about swapping out the gearbox.

I have an M90 but this will require a new tunnel. I will also consider the T5 gearbox if I can find an adapter plate / bellhousing. I'm looking for a P1800 / 1800E / ES tunnel if anybody has one for sale.

If I end up swapping the gearbox I can then look at tuning the B230 a bit more. The goal would be 250 bhp. I'm not sure the car would benefit from much more power.

classicswede · Jul 12th, 2013, 09:27

There a few different turbo manifolds to choose from for turbo positioning.

Flywheel you will need one with the trigger pattern on unless you are going to fit a trigger wheel on the front. If you only need a basic flat flywheel I should have one.

I am also looking at getting some T5 adaptor plates made in the future so stay tuned!

DJS · Jul 13th, 2013, 09:27

Thanks for the info. I'll only continue if the turbo can be made to sit between the block and the inner wing.

If it does, I might be interested in that flywheel. I'll keep you posted. With a bit of luck I'll find out today.

The T5 gearbox should be a nice easy swap, if a little expensive.

Right, better go and find an engine hoist.

heckflosse · Jul 13th, 2013, 12:32

Quote:

Originally Posted by classicswede

There a few different turbo manifolds to choose from for turbo positioning.

Flywheel you will need one with the trigger pattern on unless you are going to fit a trigger wheel on the front. If you only need a basic flat flywheel I should have one.

I am also looking at getting some T5 adaptor plates made in the future so stay tuned!

Apart from the lack of speedo drive, which is admittedly a big but, would an M46 be possible?Turbos had them so torque is not a problem.Bell housing would seem to be the limiting item.

Burdekin · Jul 13th, 2013, 20:06

Quote:

Originally Posted by DJS

Thanks for the info. I'll only continue if the turbo can be made to sit between the block and the inner wing.

If it does, I might be interested in that flywheel. I'll keep you posted. With a bit of luck I'll find out today.

The T5 gearbox should be a nice easy swap, if a little expensive.

Right, better go and find an engine hoist.

It looks perfect. This is turning out to be an awesome project...

Jul 9th, 2013, 15:58	#1
DJS Senior Member Last Online: Aug 22nd, 2022 21:05 Join Date: Oct 2008 Location: Warwickshire	B230 onto an M41 Gearbox Hi All, Does anybody know about bolting a B230 up to an M41 gearbox? I know that the sump, oil pump and pick up need to be changed for B20 items. The sump fitted without incident. I will look at the pick up and oil pump very soon. The bell housing has the same bolt pattern (B20 at least) and lines up nicely. I'm just not sure about the gearbox input shaft, clutch plate etc. Has anybody done this conversion? Any advice welcome. Cheers, Darren.

Jul 9th, 2013, 18:24	#2
classicswede Trader Volvo in my veins Last Online: Yesterday 18:07 Join Date: Dec 2004 Location: Anglesey	You will need a B21/23 or 8 bolt B20 flywheel and use the standard clutch. It does all line up and work out fine. __________________ http://www.classicswede.org www.classicswede.co.uk

Jul 9th, 2013, 18:50	#3
940_Turbo . Last Online: Jul 14th, 2013 14:28 Join Date: Dec 2009 Location: MK	Could have phrased this better.... The clutch for an early 240 is common with both 120 and 140. You can use either use a flat flywheel, or use a dog dish with an M47 cover plate and an early 240/Amazon/140 friction plate. It makes no odds whether the M41 is late or early, the input shaft remained the same. Providing you install the B230 upright the M41 will sit level. Volvo did make a bell housing to fit an m40 or 41 to a slant mounted B21, found in 1975 240 only. Last edited by 940_Turbo; Jul 9th, 2013 at 19:26.

Jul 10th, 2013, 06:09	#5
john h VOC Member Last Online: Apr 17th, 2024 17:48 Join Date: Jan 2007 Location: Huddersfield View Photos By: john h	Please post some photos of your conversion; very interesting! Will the M41 handle the torque of a turbo B230? (Volvo upgraded the gearbox to M400/410 for the 164). John __________________ XX

Jul 12th, 2013, 09:27	#7
classicswede Trader Volvo in my veins Last Online: Yesterday 18:07 Join Date: Dec 2004 Location: Anglesey	There a few different turbo manifolds to choose from for turbo positioning. Flywheel you will need one with the trigger pattern on unless you are going to fit a trigger wheel on the front. If you only need a basic flat flywheel I should have one. I am also looking at getting some T5 adaptor plates made in the future so stay tuned! __________________ http://www.classicswede.org www.classicswede.co.uk

Jul 9th, 2013, 21:16	#4
DJS Senior Member Last Online: Aug 22nd, 2022 21:05 Join Date: Oct 2008 Location: Warwickshire	Thanks for the replies gents. I'm probably going to end up buying a special flywheel if I can't find a standard flat one. I'll look for the other bits and see what this is like in the engine bay. I think that the turbo manifold and turbo should sit in the engine bay without any modification to the inner wing, which will be great. I just need to think about the plenum side. Any more advice most welcome. Cheers, Darren.

Jul 10th, 2013, 10:36	#6
DJS Senior Member Last Online: Aug 22nd, 2022 21:05 Join Date: Oct 2008 Location: Warwickshire	Hi,, Ok, I will put up some pictures when I drop the engine in. I don't think that the M40 / 41 will take the power for long if I don't look after it. The idea is to put the engine in and get it running with an aftermarket ECU etc. When it is running ok and I am happy with it I will then think about swapping out the gearbox. I have an M90 but this will require a new tunnel. I will also consider the T5 gearbox if I can find an adapter plate / bellhousing. I'm looking for a P1800 / 1800E / ES tunnel if anybody has one for sale. If I end up swapping the gearbox I can then look at tuning the B230 a bit more. The goal would be 250 bhp. I'm not sure the car would benefit from much more power.

Jul 13th, 2013, 09:27	#8
DJS Senior Member Last Online: Aug 22nd, 2022 21:05 Join Date: Oct 2008 Location: Warwickshire	Thanks for the info. I'll only continue if the turbo can be made to sit between the block and the inner wing. If it does, I might be interested in that flywheel. I'll keep you posted. With a bit of luck I'll find out today. The T5 gearbox should be a nice easy swap, if a little expensive. Right, better go and find an engine hoist.

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