Clarke57
Poster
Posts: 50
Loc: Victoria B. C. Can.
Reg: 01-26-08
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10-09-19 07:03 PM - Post#2777514
My 57 Chevy over heats at idle during long lights, heavy traffic or construction stops. I would like to try a smaller diameter pulley on the water pump on my small block 350 crate engine with a short pump. At 30 mph and faster, it runs at a cool 190 degrees. Stopped for any time for construction zones, or heavy traffic you can see the temp. gauge rise to 230 degrees in a few minutes. I have a 4 core radiator, a shroud, and use a 185 degree thermostat. Any ideas on where to purchase a 5 to 6 inch water pump pulley? Thanks for any info. Gary
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bobb
Super Senior Member
Posts: 5748
Loc: paradise
Reg: 09-05-03
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10-09-19 08:48 PM - Post#2777520
In response to Clarke57
what kind of water pump do you have?
| 70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails. |
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 GreatNorthWoods
"6th Year" Silver Supporting Member
Posts: 1218
Age: 78
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
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10-10-19 05:03 AM - Post#2777537
In response to Clarke57
Four row radiators are harder to get air through than two or three row. Had a similar problem years ago with a 4-row Walker in a 29 Ford. Engine (350) would run 180 all day at speed but would climb to 220 when idling. It took me awhile to get used to seeing 220 on the temp gauge but it didn't seem to hurt the engine any and it never boiled over. Even at 230 if it doesn't boil over you are probably okay. Perhaps a fan with more blades would do the trick. Sometimes it helps to seal up places where air can go around the radiator instead of going through it.
Vern
1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, EZ Wire, Vintage Air, Ididit column, Cruise/Tilt, PS, 59 Corvette Steering Wheel, 4-Wheel Discs, Posies Rear Springs, Coker Radials, Nova 10-bolt, Mustang II, NCA Continental Kit. |
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 2blu52
Deceased Member RIP
Posts: 19549
Loc: Montana
Reg: 03-12-02
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10-10-19 04:15 PM - Post#2777601
In response to GreatNorthWoods
220 degrees may not be excessive if you are running a proper pressure cap. 
"PEACE IS THAT GLORIOUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"
THOMAS JEFFERSON |
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Bad56Sedan
"14th Year" Gold Supporting Member
Posts: 1335
Loc: Pasadena, Texas
Reg: 04-29-04
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10-10-19 07:42 PM - Post#2777614
In response to Clarke57
The water pump pulley is about 6.4" with 1/2" v- belt grooves.
I have the same issues, so I was looking at pulleys also.
The only thing I found was a 3 groove water pump pulley that the two inner groves were the 6.4", but the outer groove was much smaller. But more than likely you are in the first crank groove with your water pump belt so it will not work, all I saw out there.
Only other option would be the hi flow water pump some after market places sell, so I bought one, it did not make any difference, increased traffic through the radiator was not even noticeable at idle.
VC56S 2 door Sedan, 40 Years
[image]https://www.chevytalk.org/fusionbb/fbbavatars/a v-3564-1354211547.jpg[/image] |
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bobb
Super Senior Member
Posts: 5748
Loc: paradise
Reg: 09-05-03
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10-11-19 08:10 AM - Post#2777655
In response to Clarke57
got pics?
| 70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails. |
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4dr 57
Valued Contributor
Posts: 4725
Loc: Texas Hill Country
Reg: 11-10-04
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10-29-19 07:34 AM - Post#2779030
In response to Clarke57
Should we assume you have tuned the carburator's fuel mixture, the distributors initial timing/idle advance/vacuum advance is all good?
Is the crate motor a vortec engine?
I'd rather be thorough than vague |
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YOUNG57
Frequent Contributor
Posts: 1299
Loc: Tennessee
Reg: 12-06-10
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10-31-19 04:09 AM - Post#2779184
In response to 4dr 57
Is your vacuum advance full intake vacuum or ported carb vacuum?
What is your initial timing advance?
Both effect idle temps.
Standard equipment pulley sizes:
Single groove crankshaft pulleys are 6 3/4” diameter and water pump pulleys are 7” diameter
Under drive, water pump turns slower than crankshaft
Double groove crankshaft pulleys are 7 3/8” diameter and water pump pulleys are 6 3/8” diameter
Over drive, water pump turns faster than crankshaft
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Clarke57
Poster
Posts: 50
Loc: Victoria B. C. Can.
Reg: 01-26-08
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10-31-19 02:15 PM - Post#2779240
In response to YOUNG57
Thanks for your interest and questions. The vacuum advance comes off of the base of my Edlbrock carburator. I have given up on a smaller pulley and I'm going to move rad into 6 cylinder position and buy a 3300 cfm puller fan from Danchuk. Cheers, Gary
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Clarke57
Poster
Posts: 50
Loc: Victoria B. C. Can.
Reg: 01-26-08
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10-31-19 02:18 PM - Post#2779241
In response to bobb
Hello Thanks for your answer. Tried an Edlbrock water pump and a new gm made water pump. Same result on both. Going for a electric puller fan Cheers, Gary
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Clarke57
Poster
Posts: 50
Loc: Victoria B. C. Can.
Reg: 01-26-08
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10-31-19 02:21 PM - Post#2779242
In response to 2blu52
230 degrees and north is the problem. Given up on smaller pulleys size. Going to 3300 cfm electric puller fan and moving rad to 6 cylinder position. thanks for contacting me. Gary
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Clarke57
Poster
Posts: 50
Loc: Victoria B. C. Can.
Reg: 01-26-08
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10-31-19 02:26 PM - Post#2779243
In response to GreatNorthWoods
Tried a 7 blade corvette fan but did not have a shroud for it. I went back to original 4 blade fan with shroud. That worked a little better. I'm down to buying a 3300 cfm Electric puller fan and moving the rad to the 6 cylinder position. Thanks for your interest. Gary
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Bad56Sedan
"14th Year" Gold Supporting Member
Posts: 1335
Loc: Pasadena, Texas
Reg: 04-29-04
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11-02-19 11:14 AM - Post#2779378
In response to Clarke57
I'd try the plug in box fan in front of rad pushing, see if it works,
Made no difference on mine still tried to over heat,
Did compression check, 190-195 psi on all 8 cylinders,
So not a blown head gasket, cracked block or cracked head.....
Then I found it...........
Distributor gear ate up!!
Bronze nickel gear half way gone......
VC56S 2 door Sedan, 40 Years
[image]https://www.chevytalk.org/fusionbb/fbbavatars/a v-3564-1354211547.jpg[/image] |
Edited by Bad56Sedan on 11-02-19 11:15 AM. Reason for edit: No reason given.
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Mel Foye
*VIP* Original Founding Member Group
Posts: 5028
Reg: 09-29-00
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11-02-19 03:04 PM - Post#2779393
In response to YOUNG57
Years ago David I was checking out radiator manufactures and their thinking. Several recommended a 15% overdrive on the WP. Your second example comes out to 14.x. Slow moving water encourages higher temps. Hope folks learn from your post. Mel
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 56sedandelivery
Gold Supporting Member
Posts: 5896
Age: 69
Loc: Everett, Wa.
Reg: 02-26-08
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11-07-19 01:28 PM - Post#2779736
In response to Bad56Sedan
I'd try the plug in box fan in front of rad pushing, see if it works,
Made no difference on mine still tried to over heat,
Did compression check, 190-195 psi on all 8 cylinders,
So not a blown head gasket, cracked block or cracked head.....
Then I found it...........
Distributor gear ate up!!
Just curious on why the bronze gear? Retro-roller cam or roller cam setup block? That gear is all but gone; concerns about the metal through the engine? I have an old dual point distributor I was planning to use, but it has a bronze gear on kit. HV/HP oil pump or thick oil?
Thanks. I am Butch/56sedandelivery.
Bronze nickel gear half way gone......
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YOUNG57
Frequent Contributor
Posts: 1299
Loc: Tennessee
Reg: 12-06-10
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11-08-19 06:28 AM - Post#2779770
In response to Mel Foye
Bad56Sedan, I think your house plug-in box fan test is a great idea before going to the trouble and expense of moving the radiator and installing an electric fan.
Mel Foye, thanks for vindication of what seemed obvious to me, but not everyone.
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Bad56Sedan
"14th Year" Gold Supporting Member
Posts: 1335
Loc: Pasadena, Texas
Reg: 04-29-04
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11-08-19 11:31 AM - Post#2779784
In response to 56sedandelivery
I really don't know why this distributor had a bronze gear.
Cam is cast iron Comp 292H that does not require a bronze gear.
Yes maybe more issues on the way.
Although oil pressure is back up at about 60PSI at idle and it is not over heating.
VC56S 2 door Sedan, 40 Years
[image]https://www.chevytalk.org/fusionbb/fbbavatars/a v-3564-1354211547.jpg[/image] |
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