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#1 | ||||||||||||
Registered User
Join Date: May 2008
Location: Mesa, AZ
Posts: 281
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Re: 250 inline running hot at highway speed
Is it just my imagination, or has this thread gone from the realm of likely causes of the OP's problem, into the realm of insanity?
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Well, think about it for a moment. Thermostats are designed to open at a certain temperature. 160F, 185F, 190F, 195F, and so on. If the coolant leaving the engine is over 200F, here's what we can surmise. The 160F thermostat is fully open. The 185F thermostat is fully open. The 190F thermostat is fully open, and so on and so forth. There is no real value in installing a cooler thermostat, or removing the thermostat! The argument is often made that the thermostat restricts flow, therefore, removing it will increase flow, and bring the temps down. This logic is flawed in a HUGE way! This logic assumes the thermostat is the cause of the restriction! Perhaps in some high HP engine, this might be the case. But I suspect the OP has a near stock setup. In which case, the odds are great something is broken. Be it a clogged radiator, clogged engine cooling passage, or a bad pump. Perhaps a collapsed hose. The lower radiator hose has a spring in it to keep it from collapsing. Perhaps it rusted out. A temporary fix will not solve the problem if the problem is poor coolant flow.
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I own 3 classic vehicles. 1971 LWB C10 Deluxe. 1974 VW Super Beetle. 1971 VW Fastback. The C10 and the Super Beetle run, the Fastback is just not there yet! Please visit my Super Beetle and Fastback profile on TheSamba. |
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#2 |
Registered User
Join Date: Mar 2015
Location: Arcadia FL
Posts: 112
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Re: 250 inline running hot at highway speed
Oooooo...I like that certainty....like a flat alum sheet in front of the crossmember ?
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#3 |
Registered User
Join Date: Mar 2015
Location: Arcadia FL
Posts: 112
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Re: 250 inline running hot at highway speed
To cycle air in or block the bottom off?
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#4 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,622
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Re: 250 inline running hot at highway speed
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#5 |
Registered User
Join Date: Mar 2015
Location: Arcadia FL
Posts: 112
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Re: 250 inline running hot at highway speed
Cooling is finicky work it seems. The things that work are oft counter intuitive.
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#6 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,267
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Re: 250 inline running hot at highway speed
Viv have you checked the ignition timing of the engine? If it's timed too slow it will run hotter and burn more gas too. Don't cost anything to check it.
__________________
Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#7 |
Registered User
Join Date: Mar 2015
Location: Arcadia FL
Posts: 112
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Re: 250 inline running hot at highway speed
I must display my ignorance....I've never done it....all I know about the process is its a light on the balancer....I've had the ignition apart and back again with good luck....as a side note...my vac advance looks super crusty...maybe swap that out before I time it?
Thanks again |
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#8 |
Registered User
Join Date: Mar 2015
Location: Arcadia FL
Posts: 112
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Re: 250 inline running hot at highway speed
I'm Just going to set it on fire in the driveway.
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#9 |
Registered User
Join Date: Mar 2014
Location: PCB Florida
Posts: 1
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Re: 250 inline running hot at highway speed
Just a question, do you have a fan shroud on the radiator? Could be I
the difference in temp |
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#10 |
Registered User
Join Date: Mar 2015
Location: Arcadia FL
Posts: 112
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Re: 250 inline running hot at highway speed
I don't and finding one is like finding a unicorn...I may endeavor to adapt or fab one
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#11 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,280
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Re: 250 inline running hot at highway speed
That's because L6s don't really have one, just the ''Finger Guard'' bolted to the top of the radiator bulkhead.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#12 |
Registered User
Join Date: Mar 2015
Location: Arcadia FL
Posts: 112
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Re: 250 inline running hot at highway speed
That was what I thought...with the availability of parts...surely if there was one then...one could be had now....does the finger guard play a part...other than fingers?
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#13 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,280
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Re: 250 inline running hot at highway speed
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I don't know if a V8 fanshroud will do you any good, there's so much airspace in the engine bay with the L6, that it's almost like it's aircooled. For the record -- I have a built 292 [30 bore, Cam, bigger valves, 4 bbl carb] and I live in Arizona year round. I run a Flex Fan, good coolant mix, 3 tier V8-size radiator, 195* T-stat, mechanical water temp gauge w/pickup in head . And I'm not running hot. It did run hot when I first was breaking it in after the rebuild. The most surprising gain was by going to the 195* thermostat [had been 180*] and by using more water in the coolant mix. I was on the coolant-heavy side 70/30 or 60/40. Now it's 50/50 or 40/60.
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#14 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: 250 inline running hot at highway speed
Magmajct, Sanity! X2 stock 250's don't need after market parts to keep cool. You have a clog or a bad part, my 250 overheating prob was not an overheating prob at all, just a bad gauge. Find the problem and fix it.
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#15 |
Registered User
Join Date: Mar 2015
Location: Arcadia FL
Posts: 112
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Re: 250 inline running hot at highway speed
I'm going to douche the block and change the pump...between that and a new radiator....think I'll be money
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