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Author Topic:   Strange temp reading
magician227
Dirt Full Roller

Total posts: 55
posted August 16, 2005 08:34 AM  
Just fired up new motor this weekend. 355 Flat top, 494/494 cam. Running dual electric fans, good radiator, straight water w/ liquid ice additive. Good new water pump. 32 degrees advance on locked HEI. 160 stat with 4 1/8" holes drilled around the edges.

Anyway, this is my question. On the first run, after about 7 min at 2000 RPM, temp went from about 170 to 250 almost instantly. Gauge sort of bounced a few times then went straight to 250. Shut motor off QUICKLY. Opened cap and water was hot, but not 250 degrees. Thinking bad gauge. Put in new one. Started again and ran fine for a good 15 minutes. Shut down, and gauge pegged 250 again. Felt hoses and intake. Again, nothing seemed really hot. When I started motor again, temp went right back to 170-180.

Could this be from air in system? Checked gauge, its good. Checked stat, good there too.

hotrodenford
Dirt Full Roller

Total posts: 60
posted August 16, 2005 09:40 AM  
I would say air pocket. Where is you temp sensor in the engine?

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If it has wheels or a skirt, you can't afford it! But they shure are fun...

magician227
Dirt Full Roller

Total posts: 55
posted August 16, 2005 09:55 AM  
Temp sensor is in the Intake, just to the passenger side of T-stat housing.

leapinlizard
Dirt Freak

Total posts: 402
posted August 16, 2005 12:07 PM  
temp guages can't read the temp of water in a air pocket. Makes them read the water that's stagnet next to the sensor. It can get pretty hot but the over all temp is still low. Run it without a rad cap to help purge air.

sc1 racing
Dirt Freak

Total posts: 419
posted August 16, 2005 06:02 PM  
i have seen a hot wire gound out and make the gauge do the same thing.

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