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Username Post: old problem new question        (Topic#346049)
turbo38s10 
"6th Year" Gold Supporting Member
Posts: 1449
turbo38s10
Loc: Agawam,MA
Reg: 09-17-09
07-24-17 10:17 AM - Post#2701217    
    In response to GreatNorthWoods

I think I'm going to try a smaller pulley next anyone got a 3751152 6 5/16" or 3947115 5 3/4"?
Show Cars has some but I'd rather have an original one.

PM me or email me at turbo38s10@comcast.net

Thanks for all the info everyone I will fiquire this out yet.



 
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turbo38s10 
"6th Year" Gold Supporting Member
Posts: 1449
turbo38s10
Loc: Agawam,MA
Reg: 09-17-09
07-26-17 07:04 AM - Post#2701512    
    In response to turbo38s10

Well found out I smaller 6" instead of 7" pulley. I'll give that a try and see what happens for a couple weeks. Should speed up the waterpump and maybe help with the cooling.



Edited by turbo38s10 on 07-26-17 07:05 AM. Reason for edit: No reason given.

 
Andy4639 
Contributor
Posts: 833
Andy4639
Age: 57
Loc: Liberty, SC
Reg: 08-06-16
07-26-17 07:17 AM - Post#2701514    
    In response to models916

  • models916 Said:
Water pump bearing is sealed. Lube is more for the surface to surface of the impeller to housing.



I haven't said anything about a bearing in this post!



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
Andy4639 
Contributor
Posts: 833
Andy4639
Age: 57
Loc: Liberty, SC
Reg: 08-06-16
07-26-17 07:39 AM - Post#2701516    
    In response to turbo38s10

  • turbo38s10 Said:
Running hot in traffic runs great when moving but after 5-10 minutes in traffic gets up to 195-200 and the I won't let it get higher I pull over. Currently 409 bored .30 over just done so block is clean. Aluminum water pump, 6 blade fan no clutch, 160 thermostat(but doesn't matter whether it's 160, 180 or none does the same thing), 1800 cfm pusher electric fan, radiator support shrouds, 3 core aluminum radiator(not champion).Put my old 3 core 348 radiator that watewr cleaned and tested in and still did the same thing( also did this when I had my 348 in it) Everything I did slowed it but doesn't stop it. I took out the fender well dust shields to let more air out.Currently using plain water since it is supposed to cool better than anything else.



The electric pusher fan isn't no where near big enough per CFM's for a big block.
Min size is: 2,500 CFM for a 8-cylinder if it's .30 over you need even more I would think.
The pure water as everyone has stated is a no no it will boil faster which in the system means it will increase temp quicker than a 50/50 mix.
The smaller pulley may help a little but I doubt it does much. It may move the water faster in the system but it's not the problem.
Sitting in the garage letting it idle what does it do? How hot does it get? 220-230* is getting hot. A good gauge will be close but not a sure bet when it comes to verifying temps.
Are you going by a gauge in the car only are have you checked it with a temp gun also?
Verify it first.
Timing has a lot to do with a engine running hot also. Check and make sure it correct for the motor.



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
Tri5man 
Valued Contributor
Posts: 3489
Tri5man
Loc: Possums Crotch, KY
Reg: 06-26-07
07-26-17 07:50 AM - Post#2701518    
    In response to Andy4639

Changing the water pump pulley is a waste of time and money. Running hot at low speed is indicative of not enough Fan plain and simple.

Gary



 
raycow 
Honored Member
Posts: 26840
raycow
Loc: San Francisco, CA
Reg: 11-26-02
07-26-17 01:36 PM - Post#2701556    
    In response to Andy4639

  • Andy4639 Said:
The pure water as everyone has stated is a no no it will boil faster which in the system means it will increase temp quicker than a 50/50 mix.


To be entirely correct, pure water boils at a lower temp than a 50/50 antifreeze mix. This means that for any given temp the cooling system pressure will higher than with 50/50. However, this will not cause any hotter running than 50/50 as long as the pressure stays below the pressure cap rating. Assuming a 15 psi cap, this would be approximately 250°F at sea level. Of course if you reach a high enough temp to trip the pressure cap, then you have a problem.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Andy4639 
Contributor
Posts: 833
Andy4639
Age: 57
Loc: Liberty, SC
Reg: 08-06-16
07-26-17 03:09 PM - Post#2701563    
    In response to raycow

  • raycow Said:
  • Andy4639 Said:
The pure water as everyone has stated is a no no it will boil faster which in the system means it will increase temp quicker than a 50/50 mix.


To be entirely correct, pure water boils at a lower temp than a 50/50 antifreeze mix. This means that for any given temp the cooling system pressure will higher than with 50/50. However, this will not cause any hotter running than 50/50 as long as the pressure stays below the pressure cap rating. Assuming a 15 psi cap, this would be approximately 250°F at sea level. Of course if you reach a high enough temp to trip the pressure cap, then you have a problem.

Ray



I stand corrected.






1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
This Forum is Sponsored by
1-800-IMPALAS  *  www.impalas.com
Visit Impala Bob's forum on ChevyTalk
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