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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
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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
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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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Old 01-30-2019, 04:24 PM   #9
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I have given it some thought about the original harness and ECU's and i might have come to a solution. It wont be the cheapest and surely not easier as converting the original wiring, but it will give me the opportunity to support any modifications as i go further with this car
In april im visiting my sister in the states and as im not in a hurry with this car im going with megasquirt possibly. And because it is cheaper there, im going to order it to my sister's house :D
But just to give an update. I painted the engine block and oilpan, the head is rebuilt and everything is almost ready to be put back together. As this is my first time rebuilding a engine, im taking my time.
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Old 01-30-2019, 04:58 PM   #10
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Looking good. Make sure you contact Linuxman51 (kenny) for megasquirt support.

Also the block mount distributor cap and rotor tune up parts are less than half the cost of the head mount distributor stuff. It will be easy to get an LH2.4 distributor and intermediate shaft here in the US if you don't find that stuff. Just ship it back home and it'll be waiting for you. Let us know in off topic when you will be here and you can probably meet up with some folks.
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Old 04-11-2019, 10:01 AM   #11
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Havent had time to post anything for awhile, but the engine is mostly complete and turns over by hand and everything feels as it should. As right now i have been in the states for almost a week now and im thinking i should visit a parts store, i need a fuel pump, inlet air temp sensor and a coolant temp sensor, megasquirt works well with gm stuff and i figured these could be cheaper here. If anybody resides in New Hampshire, exeter area im more than available for a chat, but here i dont have a car...
When i get back home, im going to pull the old engine, do some work under the hood with the wiring and a little bit of cosmetics then the new engine will drop in.

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Old 11-15-2019, 12:27 PM   #12
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Hi. Long time no see. Alots of time has passed but it does not mean that i haven't been busy with this turd of a car :D
As of this moment the car runs, but i have to confirm timing, find a suitable driveshaft, put in new slave and master cylinders for the clutch and i have to fab the shifter unit.
After that is all the small stuff and the tune (Which is not small by all means )
I'll let the pictures do the talking. It has been a real learning curve to say the least - my first car where all the work has been done by me, so don't judge the fab work i have done.











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Old 11-15-2019, 12:40 PM   #13
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Looks great man! Your project is steadily moving on. Keep on truckin'
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Old 11-23-2019, 09:23 PM   #14
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Way to go! Nice work on that project.
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