Author Topic: Temperature issue with injected engine  (Read 119 times)

Offline tmsmini

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Temperature issue with injected engine
« on: March 04, 2019, 01:03:40 PM »
I have been holding off on posting this as it just seems such an unlikely problem.

I have a few issues still to sort out with this engine, one of them is the running temperature. It is not your normal A series, but it is an series.
The spec is this:
Block Style, MPi;Head, Calver ST Cylinder Head Super Sports Model: CST2000; Cam, Kent MDM274MPI; Rockers, Forged 1.5; Bore, +10; Flywheel, MPi; Final Drive, 3.1; Differential, Quaife; Speedo, Smiths Electronic; Speedo TPM, Adjustable; Fueling, Specialist Components Typhoon 50 mm TB; Ignition, Specialist Components Typhoon; Radiator, MS C/ARA 4442

I know the MPi block has different oilways and coolant passages, but I don't think this affects that, but it may.

At idle in the driveway, the engine will warm up nicely and if I let it go for over 20 minutes the electric fan will kick in. But as soon as I start moving the temp drops. With ambient temp around 50-55 F/10-13 C, the coolant temp will run about 150 F - 65 C.  This is with the 190 F - 88 C thermostat.

I have checked the gauges as I have both the electronic sensor and the Smiths mechanical gauge as well as a infrared laser version and a radiator cap type to check with.
I have also checked the thermostats and I am actually using a fancy Robert Shaw Flowmaster 195 at the moment with no real change in running temp.

I have a 205 version that I am ready to put in, but that just seems like an extreme step.

The reason this is so critical with the FI engine is that the system will add fuel for warm-up correction. This table can be modified as well and I have made small adjustments, but I would prefer to get the engine running in the 180-190 range.
Terry


Online MiniDave

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Re: Temperature issue with injected engine
« Reply #1 on: March 04, 2019, 01:28:51 PM »
The only way I can get my '89 carbed Mini to warm up is drive it on a warm to hot day. That's since I put in the aluminum rad in, before that it was a little too warm to my thinking - it ran 3/4 up the gauge on a 65* day - on the highway. So I went to the aluminum radiator, now even on Kansas 100* days it runs right at half way up the gauge.

I'm toying with the idea of blocking the entire grill on cold days, half the grill on warmer days, then opening it up in summer.
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Offline jedduh01

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Re: Temperature issue with injected engine
« Reply #2 on: March 04, 2019, 02:46:19 PM »
I would consider testing by blocking some of the  grille off,  simple cardboard,. and go for  a test..

Remove some air flow.. Too COOL almost seems strange but 55Degress is chilly!!

Offline tmsmini

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Re: Temperature issue with injected engine
« Reply #3 on: March 04, 2019, 02:51:28 PM »
I did try this with a piece of plexiglass I had laying around.
It helped a little, but at that point I also had a thermostat that was not closing properly, so i need to retry this.

Offline tmsmini

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Re: Temperature issue with injected engine
« Reply #4 on: March 04, 2019, 02:54:28 PM »
This is how the engine is laid out.
There is a bypass hose from the heater outlet to the radiator, but that is blocked off while I sort this out. Eventually I will place a flow restrictor in the hose.

Offline 94touring

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Re: Temperature issue with injected engine
« Reply #5 on: March 04, 2019, 04:35:04 PM »
I just put a piece of plexi across the front this afternoon, temps now read N at cruise.   I left a small gap for the radiator too. Currently 25 F out

Offline tmsmini

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Re: Temperature issue with injected engine
« Reply #6 on: March 04, 2019, 05:19:59 PM »
I would expect to have to this in 25 degree weather, but not in 50-60 degree weather I am experiencing.
I wonder if BMC ever had a cold weather running bulletin? They had several for hot weather running.

Offline 94touring

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Re: Temperature issue with injected engine
« Reply #7 on: March 04, 2019, 05:27:20 PM »
50s and 60s I run cold too. Has to be 70s and up for me to run N without this new plate.

Offline tmsmini

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Re: Temperature issue with injected engine
« Reply #8 on: March 04, 2019, 05:31:28 PM »
Maybe I just never paid as close attention before. With the FI, it becomes very critical as a couple of enrichment tables are temp based.