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B23FT M46 swap clutch parts

TheVolbro

TheVolbro

The Collector
Joined
Jun 6, 2020
Location
San Francisco, California USA
I have a 1984 760 Turbo that I’m trying to row gears in. It has the unicorn B23FT with LH2.0 electronic fuel injection under the hood. I have an M46 transmission mated to a cable clutch bell housing from a naturally aspirated 740 I’m thinking about installing, and am wondering what flywheel and clutch kit I need to be looking for.

Volvo never paired this engine with a manual transmission. Are there any gurus out there who are in-the-know on this swap?
 
Yes, Volvo did have the M46 available with early gas turbo 760. It's pretty rare and uses the hydraulic clutch actuation. Your clutch type should use a dog dish flywheel as mentioned. If you aren't planning on raising the boost too much you should be fine with a stock Sachs clutch kit for your car. Just be sure to get the correct throwout bearing. You have to be sure as what type of throwout arm is on the bell housing you have. Early setup uses a couple of pins to mount the bearing. The later setup the bearing just fits into a hole in the throwout arm.
 
Literally, anything you want to install in it as long as you have all the corresponding components. The turbo 740/760 cars were all hydraulic clutches. I have seen at least 3 1984 760 Turbos with an M46. Doug Calamar had one that he parted out for a Turbo engine swap into his 240 that never happened.
 
I’d read online that the only transmissions paired with the B23FT were the AW70/AW71 and ZF22, despite the M46 being available with the D24T and B28F engines the same year. I am aware that the turbo gas motors from 1985 in 7/9 cars were available with M46 and all had a hydraulic clutch.

The hydro setup might be the route I go, I just figured with how much I actually like the feel of the cable clutch in my 242tic that maybe I’d go with the same setup in this 760.

Also—I know the M46 from n/a cars is geared differently. Does anyone have experience with the pros/cons of having taller 1st and 2nd gears in turbo cars?

I appreciate the input fellas!
 
pat244ti said:
My 84 760T had an M46 w/cable clutch and flat flywheel, but it may have been swapped
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This is good info. Anything regarding this unicorn as f**k drivetrain setup helps. I know the hydro clutch setup was developed and in use at this time because the manual transmission 260’s had hydro clutches, but given they stayed with cable clutch setups on B21FT cars it would make sense if they used a cable setup for the B23FT.

2manyturbos said:
Literally, anything you want to install in it as long as you have all the corresponding components. The turbo 740/760 cars were all hydraulic clutches. I have seen at least 3 1984 760 Turbos with an M46. Doug Calamar had one that he parted out for a Turbo engine swap into his 240 that never happened.
Click to expand...

Roy, do you know if those ‘84 760’s you saw had original M46 hydraulic clutch setups? Or had they been converted/swapped?
 
All the n/a 740 cars had cable clutches to my knowledge. Either M46 or 87 and later an M47. The 84 760T I parted out had an automatic. It's another turbo swap that hasn't happened yet. :lol:
 
I would use the dog dish. It lets you use a larger clutch for more holding power with lower pedal pressure. The stock turbo dog dish clutch would work for you. Just make sure to match up the throwout bearing.
 
I ran 12.61 with dog dish and 6 puck ceramic disc and m46 trans with 84 B23ft in 89 744. LH 2.4. E85.

Third gear pull on the dyno to 110 or so.
"


Here is the damage after the dog dish flywheel exploded at 7k in the burn out box.. I could do 120 in third gear, 3.31 ratio rear end, no rev limit..



Nowdays I only use billet steel flywheels in cars I race with. 240mm clutch discs. JohnV flywheels.
 
cosbySweater said:
this is my favorite youtube video ever
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I feel like this video should be a sticky at the top of the page for all that want to use the stock cast flywheels for anything other than daily driving cars that will never see anything more aggressive than a Starbucks drive-thru.
 
sbabbs said:
I ran 12.61 with dog dish and 6 puck ceramic disc and m46 trans with 84 B23ft in 89 744. LH 2.4. E85.

Third gear pull on the dyno to 110 or so.
"


Here is the damage after the dog dish flywheel exploded at 7k in the burn out box.. I could do 120 in third gear, 3.31 ratio rear end, no rev limit..



Nowdays I only use billet steel flywheels in cars I race with. 240mm clutch discs. JohnV flywheels.
Click to expand...
Billet flywheel… ✔️
Holy shitbox hahaha wow. Fwiw, the car will be used in road course fashion, not drag racing. But sub-13s is respectable as hell. That’s not with a stock turbo, is it?
 
Firstly, your B23FT has LH 2.1. Secondly, as others have said, yes, the M46 was available in the 760 Turbo for 1984 in the states. Engine part number was 499630. Unless it has been swapped, the one in your car is a 499631, since it's an Aw71 car. @swedishiron.com owns a gray/black '84 764Ti that needs clutch work. He also was planning on buying a blue on blue '84 764Ti with M46 over 23 years ago that had a blown overdrive before the seller flaked out after he and I swapped the transmission out for a good working example from an '83 242T.
 
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John242Ti said:
@swedishiron.com owns a gray/black '84 764Ti that needs clutch work. He also was planning on buying a blue on blue '84 764Ti with M46 over 23 years ago that had a blown overdrive before the seller flaked out after he and I swapped the transmission out for a good working example from an '83 242T.
Click to expand...
Fixed that for you.
I don't have any cars with red leather interiors right now
:-(
 
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