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Old 01-08-2019, 02:08 PM   #1
juss
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Default B200ft from a 700 to a 245

It might be a stupid question. But two months ago i got a offer from a friend for a b200ft with wiring and tranny.
My own car (1978 245) is currently using a B21A, which is crappy as hell, poor performance and that automatic gearbox is not helping matters.

I was contemplating that 7 series wiring. Is it possible to just use the engine loom and ecu and ezk connectors for it to work? Maybe somebody has done similiar stuff and can help?

Engine currently is torn down, new seals, head resurfacing, main bearings etc. so it should run alright.

Would really appreciate the help
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Old 01-08-2019, 07:41 PM   #2
classicswede
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You will need the 240 distributor and shaft that drives it.
The gearbox does not have the drive to run your speedo

You can spend hours/days/weeks messing with the 7 series loom picking it out or you can buy a new plug and play loom to use the ECU's
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Old 01-08-2019, 08:40 PM   #3
dl242gt
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As mentioned above. It will be much easier to get a B230F LH2.4 wiring loom from a 240 and use that for the ecu and icu. The other LH2.4 components on the engine like the air mass sensor and coolant temperature are the same. I think you remove the full throttle wire from the ecu connector if I recall correctly as the turbo ecu doesn't use the full throttle swtich like the n/a car does. That is why a factory built 240 with LH2.4 goes from n/a to turbo so easy.

I just helped with a LH2.4 swap of a 89 B230F into a 77 244. It was only a few wires needed to make it run. The only other issue is if you want to do the work to use the electronic speedo to provide a vss signal to the ecu. We didn't and the high idle isn't a bad issue if you know what's going on.
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Old 01-12-2019, 01:22 PM   #4
juss
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Quote:
Originally Posted by classicswede View Post
You will need the 240 distributor and shaft that drives it.
The gearbox does not have the drive to run your speedo

You can spend hours/days/weeks messing with the 7 series loom picking it out or you can buy a new plug and play loom to use the ECU's
Cant i use the b200ft dizzy when i modify the firewall?
About the speedo i know, and really not worried about that.
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Old 01-12-2019, 05:33 PM   #5
classicswede
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Just use the dizzy and shaft from your 240 engine.

Don't hack the 240 and then make it an engine out job to service the ignition system

The other issue with the M46 is the brackets for the gear lever do not fit the 240, you will eitehr have to find teh bits off a 240 gearbox or shorten them
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Old 01-14-2019, 01:39 PM   #6
juss
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Actually i belive the transmission is a M47, but im not that sure. I should post a picture of it.
The shaft fits, i know, but will the distributor from an carburated car work on a LH?
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Old 01-14-2019, 02:08 PM   #7
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On an LH 2.4 system, the distributor is only there to route the spark to the correct cylinder, the ECU does all the rest (timing, ignition advance, etc) based on the flywheel sensor.

So there are sensors in an older distributor that will not be used.
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Old 01-15-2019, 06:13 AM   #8
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It will be a lot easier if you get an ’89+ 240 parts car. You will also need the fuel tank, filler neck, fuel pump, brackets, wiring etc which is not present on your ’78. I did this to a ’76 and it was a pretty big project.
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