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09-26-2010, 04:58 PM
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CC Member
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Join Date: Mar 2010
Location: Williamsburg,
VA
Cobra Make, Engine: SPF #2920 w/ Keith Craft 408
Posts: 250
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Not Ranked
The water pump has 2 ports. One goes to the heater and the other has a plug in it. The water pump is an Edelbrock 351W spec'ed by Keith Craft. Drove it last weekend in the 90s and the temps would shoot up from 80C to 100-110. Turing the heater on brought them back down to normal. Next weekend I’ll try the new thermostat and see what happens.
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09-26-2010, 05:46 PM
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Senior Club Cobra Member
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Join Date: Nov 2003
Location: Parker County,
Tx
Cobra Make, Engine: LoneStar LS427 , 427 Windsor
Posts: 381
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Not Ranked
I'd bet the lack of a bypass is exactly your problem.
Without the bypass there is no circulation within the engine when the thermostat is closed. In that case, you can have boiling water/steam in the heads while the water near the thermostat (and temp sender) is still relatively cool. Once the heat gradually migrates into the intake manifold the thermostat opens and you get a scalding blast past the temperature sender. The water then circulates through the radiator and everything cools down. The thermostat closes and the cycle repeats.
Turning on the heater provides an alternate bypass.
Add a bypass hose. Soon!
Jim
__________________
Jim
------------
A Gnat! Quick, get a sledgehammer!
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09-26-2010, 09:01 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,409
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Not Ranked
The bypass hose allows water to circulate through the block while the thermostat is closed. It allows for a more even warm up without hot spots. You indeed may have a sticking thermostat. You should consider using a "Balanced Thermostat" style thermostat. Better flow and I believe they fail "open". Would be interesting to run without a thermostat and see if the temp spiking still occurs. Be sure to install any new thermostat with the weep holes on the flange at the top and install the thermostat in the correct spring orientation. (engine vs. radiator)
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
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SPFWiringDiagrams@Comcast.net
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09-26-2010, 09:15 PM
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Regularly Offensive
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Join Date: Feb 2006
Location: yuba city,
ca
Cobra Make, Engine: spf
Posts: 1,231
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Not Ranked
How about posting a few pictures of your engine so we can see which water lines you have or don't have............
something like this
__________________
Ed
Too close for missles, switching to guns.........
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09-27-2010, 11:01 AM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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Not Ranked
Thudmaster,
Looking at your water pump and alternator, it does not apear that your bolts are polished, is it just a reflection or do they not come polished?
Quote:
Originally Posted by thudmaster
How about posting a few pictures of your engine so we can see which water lines you have or don't have............
something like this
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09-27-2010, 01:21 PM
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Regularly Offensive
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Join Date: Feb 2006
Location: yuba city,
ca
Cobra Make, Engine: spf
Posts: 1,231
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Not Ranked
they are all arp.......black
some on the block are chrome
__________________
Ed
Too close for missles, switching to guns.........
Last edited by thudmaster; 10-02-2010 at 02:49 PM..
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09-27-2010, 01:26 PM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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Not Ranked
Nice touch, breaks up the glow. Sweet looking engine!!!
Quote:
Originally Posted by thudmaster
they are all arp.......black
some on the blovk are chrome
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