How hot should the Twin Spark run?

Retro Cars · #1 (**permalink**) 09-20-2006, 04:55 AM

I reckon our 75 Twin Spark is running hotter than it should be. Despite a new rad and thermostat, it's running above the centre line of the gauge at speed. That corresponds to about 90 degrees C on the scale but the fan comes in and out as it should which makes me wonder if the gauge and/or the sender are faulty.

My S4 Spider runs at a solid 70-80 degrees on the road, going up to 88 or so in traffic before the fans come in. As they're essentially the same engine that makes me think the 75 is running hotter than it should.

Or can other Twin Spark owners tell me if the Twin Spark motors run hotter than the single-plug engines? I'm sure the head gasket's fine and going by past experience I'm happy to blame the electrics...

Roadkill · #2 (**permalink**) 09-20-2006, 06:03 AM

I've got no idea on how hot it should run, but mine hovers also above the center line, at about 90 degrees. So far I've taken this as normal, but maybe somebody with more wisdom can shed further light on the subject?

**Craig** · #3 (**permalink**) 09-20-2006, 01:43 PM

G'Day ????,

The fan on the TS should come on at 88°C. The thermostat should open between 81°C to 95°C.

In normal driving, my fan normally only comes on after a prolonged idle except on hot days when it comes on more often.

Normal running temp is closer to that of your Spider..

Retro Cars · #4 (**permalink**) 09-21-2006, 02:37 AM

Cheers for the info. From what you've said I reckon the gauge reading is out but the fan switch is working just right. Thanks to climate change it's supposed to be like 28 degrees today in the South West UK so I'll fire it up and take it for a smoke.

That's after I've fitted the Eibach springs of course...

Paul

sslim · #5 (**permalink**) 09-27-2006, 09:11 PM

Quote:

Originally Posted by Retro Cars

I reckon our 75 Twin Spark is running hotter than it should be. Despite a new rad and thermostat, it's running above the centre line of the gauge at speed. That corresponds to about 90 degrees C on the scale but the fan comes in and out as it should which makes me wonder if the gauge and/or the sender are faulty.

My S4 Spider runs at a solid 70-80 degrees on the road, going up to 88 or so in traffic before the fans come in. As they're essentially the same engine that makes me think the 75 is running hotter than it should.

Or can other Twin Spark owners tell me if the Twin Spark motors run hotter than the single-plug engines? I'm sure the head gasket's fine and going by past experience I'm happy to blame the electrics...