putting a 21ft into a 90'240 with turbo out of a 760

[Volvowhitebelt]

So there's a local 240 legend who is swapping a motor for me. I have a 90' 245 and a rusted out 85' with a B21FT that runs great. I'm gonna have it swapped into the wagon. This fellow, who has fixed and sold hundreds of 240's over the years, is doing the swap and told me that I could pick up a turbo and exhaust manifold out of a 760 to get a little more pep, without losing reliability. I found a totalled, but running 89' 760. Any opinions from the wizards in here about this attempt?

Thanks in advance

 

[Pietercc]

I would put the whole engine out of the 760 into the 240, as its a larger engine, or just throw a turbo onto the NA engine. The B21 may be a very stout engine, but you can get a lot more out of a 90 B230 by strapping a turbo to it. The 90+ manifold is what you want, and I would prefer a T3 over a 13c or 12b that a late turbo redblock would have.

 

[Jack]

This is more of a fairy tale than a legend

 

[dl242gt]

I hope he is going to use the LH2.4 system out of the 240 for engine management. You'll just have to get the computers from a turbo model.

The small later turbos have great response but are a bit of a loss for top end and become less efficient at higher boost. The T3 that you already have is fine. If you are going to mess with the 760 just take the whole engine as suggested. Otherwise just use what you have and save the work and money.

 

[nordmaschine]

Shouldn't B21FT have T3 whereas '89 B230 has 13C, which is smaller, less potential power but quicker spool if you commit to lower power goals?

And '89, shouldn't that still be flat runners manifold and skinny rods block?

 

[2manyturbos]

Shouldn't B21FT have T3 whereas '89 B230 has 13C, which is smaller, less potential power but quicker spool if you commit to lower power goals?

And '89, shouldn't that still be flat runners manifold and skinny rods block?

Yes. The B21FT will have a T3 as built at the factory. The 1989 B230FT can be either a Garrett T3 or a Mitsubishi TD05-12B. The Bertones came with the T3. 740 and 760 models in the US came with the Mitsubishi 12B. The improved turbo exhaust manifold didn't appear until the 1990 model year. The 1989 B230FT most likely has the 9mm "skinny" connecting rods in it. Supposedly, people have found 13mm rods in 1989 engines. That wouldn't surprise me. Volvo never had a hard date as to when they made the design changes.

 

[Volvowhitebelt]

Seems like the 89 donor isn't the best option then. I don't need to make a huge ton of power, just wanted to take advantage of this swap opportunity and get whatever I could get out of it without going hogwild into things that I further do not understand. The 21ft with the existing T3 and a 90+manifold doesn't sound like too much to reasonably be able to employ. The LH 2.4 would be coming along with.

One other question would be in reference to what Pietercc said about turboing the b230. What does that entail?

 

[Pietercc]

One other question would be in reference to what Pietercc said about turboing the b230. What does that entail?

Getting the turbo stuff, either drilling the block or oil pan for the oil return, and using an oil feed on the front of the engine for oil feed. Maybe get a turbo head, might be worth it for the sodium valves, and it will have a T cam in it already, or you can shim it for a different cam while its off the car.

 

[nordmaschine]

Seems like the 89 donor isn't the best option then. I don't need to make a huge ton of power, just wanted to take advantage of this swap opportunity and get whatever I could get out of it without going hogwild into things that I further do not understand. The 21ft with the existing T3 and a 90+manifold doesn't sound like too much to reasonably be able to employ. The LH 2.4 would be coming along with.

One other question would be in reference to what Pietercc said about turboing the b230. What does that entail?

LH2.4 is not going to "come along with the B21FT" because all the B21FT's had K-Jetronic, aka CIS Injection. But your '90 240 is going to be LH2.4, so you just need LH and EZK computers out of a 940 turbo to plug instead of your n/a computers and move MAF wires to the appropriate (right) side of the engine bay. But Local 240 Legend should know that already. I hope.



@2manyturbos , here we had Motronic ET Jurbos for 84-89 with T3 and air-to-oil coolers and skinny rods, 87-89 LH2.2 turbos with water-to-oil coolers and no idea what turbos, I never had any of those cars, but I believe 13c's, 90+ regular 13c LH2.4 turbos and B204GT's with TB3061's, basically T3's....

 

[2manyturbos]

LH2.4 is not going to "come along with the B21FT" because all the B21FT's had K-Jetronic, aka CIS Injection. But your '90 240 is going to be LH2.4, so you just need LH and EZK computers out of a 940 turbo to plug instead of your n/a computers and move MAF wires to the appropriate (right) side of the engine bay. But Local 240 Legend should know that already. I hope.



@2manyturbos , here we had Motronic ET Jurbos for 84-89 with T3 and air-to-oil coolers and skinny rods, 87-89 LH2.2 turbos with water-to-oil coolers and no idea what turbos, I never had any of those cars, but I believe 13c's, 90+ regular 13c LH2.4 turbos and B204GT's with TB3061's, basically T3's....

I was just referring to the 1989 model year here in the US. 84-87 740-760 Turbos in the US have the Garrett T3 on them. The earliest cars did not have water cooled turbos. I don't know what year water cooled turbos were standard for US market cars because so many of the non-water cooled turbos were replaced very early in the vehicles life.

 

[Volvowhitebelt]

LH2.4 is not going to "come along with the B21FT" because all the B21FT's had K-Jetronic, aka CIS Injection. But your '90 240 is going to be LH2.4, so you just need LH and EZK computers out of a 940 turbo to plug instead of your n/a computers and move MAF wires to the appropriate (right) side of the engine bay. But Local 240 Legend should know that already. I hope.



@2manyturbos , here we had Motronic ET Jurbos for 84-89 with T3 and air-to-oil coolers and skinny rods, 87-89 LH2.2 turbos with water-to-oil coolers and no idea what turbos, I never had any of those cars, but I believe 13c's, 90+ regular 13c LH2.4 turbos and B204GT's with TB3061's, basically T3's....

When i said "come along with", I meant come along with the finished product. Anyway here's another question: is there an issue with the knock sensor and the LH2.4 that needs to be solved? Like fabricating a mount for it and possibly having to change flywheel? I found the LH and EZK computers on ebay but when I asked the fellow why he was going with the 2.2 system instead he told me it was easier to plug and play on his 88' and he didn't want to have to mess with the knock sensor issue.

The local 240 guy I'm working with has bought alot of 240s at auctions over the years and fixed them up to sell. But I don't know how in depth his knowledge is on these more non- stamdard swap type deals. That's why I'm asking the brick wizards.

 

[bobxyz]

See this thread for what I did to convert my B21FT K-Jet to LH2.4
https://www.turbobricks.com/index.p...ion-just-4-wires-to-make-it-run.230687/page-5

Converting to LH2.2 is easier because you don't need the 60-2 tooth flywheel/flexplate, nor the CPS sensor and mounting bracket - these are all handled by the LH2.2 distributor instead. The downside is that LH2.2 isn't readily chipable (unless you're sbabbs).

Adding the LH2.4 knock sensor was easy - just flatten the molded boss on the block and drill/tap a bolt hole.

The K-Jet T3 turbo's need a CBV compressor bypass valve added when used with the EFI intake manifold/throttle body.

 

[Pietercc]

I was just referring to the 1989 model year here in the US. 84-87 740-760 Turbos in the US have the Garrett T3 on them. The earliest cars did not have water cooled turbos. I don't know what year water cooled turbos were standard for US market cars because so many of the non-water cooled turbos were replaced very early in the vehicles life.

87 is 12b.

 

[Pietercc]

The local 240 guy I'm working with has bought alot of 240s at auctions over the years and fixed them up to sell. But I don't know how in depth his knowledge is on these more non- stamdard swap type deals. That's why I'm asking the brick wizards.

You will get more power and efficiency out of a T+ with your current engine, and need to do no fucking with the 2.4 swap, as it's all built in. Drill a whole for oil return, take a tap from the front of the engine, run 700 series intercooler pipes. Much simpler.

 

[pakisas]

You will get more power and efficiency out of a T+ with your current engine, and need to do no fucking with the 2.4 swap, as it's all built in. Drill a whole for oil return, take a tap from the front of the engine, run 700 series intercooler pipes. Much simpler. nced cloud

I think you tell right. I have a motor which run 900 series inter cooler pipe.