Temperature Sender on MGB Engine

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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ariddett
MegaSquirt Newbie
Posts: 2
Joined: Mon Sep 03, 2012 8:28 am

Temperature Sender on MGB Engine

Post by ariddett »

Hi, question for an amateur engineer here.

I'm putting together an EFI setup based on the MegaSquirt for a 1973 MGB with the standard 1800cc B Series engine. This has a temperature sender in the block. However, a friend has suggested using a modern temperature sensor instead for better control by the ECU.

If I do this, how can I provide an output to the original temperature gauge on the dashboard? It's a Smiths instrument, of the one-wire type. Grateful for any steers and explanations.

Thanks,

Adam
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kjones6039
Master Squirter
Posts: 618
Joined: Sat Jul 22, 2006 7:02 pm
Location: Eureka, Nevada USA
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Re: Temperature Sender on MGB Engine

Post by kjones6039 »

ariddett wrote:Hi, question for an amateur engineer here.

I'm putting together an EFI setup based on the MegaSquirt for a 1973 MGB with the standard 1800cc B Series engine. This has a temperature sender in the block. However, a friend has suggested using a modern temperature sensor instead for better control by the ECU.

If I do this, how can I provide an output to the original temperature gauge on the dashboard? It's a Smiths instrument, of the one-wire type. Grateful for any steers and explanations.

Thanks,

Adam
I agree with your friend! The one wire sensor will likely not provide what you need for MS. If possible I would install a second sensor and retain the OEM for your gauge.

Do you have a place on your MG engine that might accommodate it?

Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
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trakkies
Super Squirter
Posts: 1162
Joined: Tue Dec 30, 2008 3:06 am
Location: SW London, UK

Re: Temperature Sender on MGB Engine

Post by trakkies »

Yes - keep the dash gauge electrics as is, and fit another two wire type for MS. A block return type could cause all sorts of problems for MS. IIRC, there are thermostat housings that can take a sensor (some BMC A series engines?) - re-site the dash one there and fit the MS one to the original place. It's more important MS knows the exact coolant temp than your gauge. :D

It would be theoretically possible to share the new sensor with your gauge - or possibly use a spare output from MS to drive it. But this would require one off specialist electronics.
Dave P, London UK.
Rover V-8
MSII V3
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ariddett
MegaSquirt Newbie
Posts: 2
Joined: Mon Sep 03, 2012 8:28 am

Re: Temperature Sender on MGB Engine

Post by ariddett »

Thanks trakkies, well that nails it then. I'd hoped it might be a simple option but never mind. There is a precedent for fitting another sensor above the original by drilling into the thermostat housing and tapping it, so I will look into that.

Cheers again!
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