To Drill or Not To Drill Thermostat - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #16 (permalink)  
Old 01-03-2011, 05:04 PM
scrot's Avatar
Registered User
 
Last photo:
Join Date: Apr 2006
Location: In front computer
Posts: 449
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If drilling a hole or holes in a thermostat was a good idea, why don't the manufactures do it, and advertise it as "new and improved," "high performance", or some other bs?
They could charge a higher price for it if it were a good idea.
Some have a very small hole around 1/16" with a loose rivet in it to restrict the flow of air even more.

So the fact that the manufactures aren't doing it should tell us something.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 01-03-2011, 06:16 PM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,767
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
Stewart performance does it has the holes in the thermostat they sell.
And i read somewhere where ford did it in the windstar van also.


Cole
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 01-04-2011, 03:22 AM
Registered User
 
Join Date: Jan 2011
Location: Saddle Brook,N.J.
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
running hot

You're in Florida, try a 165 or 180 thermostat. Check your radiator cap to make sure it is good and of the correct lbs. Run a 50-50 anti freeze-water mix. Set your fan to come on earlier, maybe 185-190 max. Are you running a fan shroud? They do work! I would not waste time drilling holes, once the thermostat opens, after warm up, they don't serve any purpose. Good luck! Bob

Last edited by Buzzard II; 01-04-2011 at 03:34 AM.
Reply With Quote Quick reply to this message
  #19 (permalink)  
Old 01-04-2011, 04:47 AM
Sweet-34's Avatar
Lost In The 50's
 
Last photo:
Join Date: Mar 2004
Location: Florida
Posts: 128
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Buzzard II
You're in Florida, try a 165 or 180 thermostat. Check your radiator cap to make sure it is good and of the correct lbs. Run a 50-50 anti freeze-water mix. Set your fan to come on earlier, maybe 185-190 max. Are you running a fan shroud? They do work! I would not waste time drilling holes, once the thermostat opens, after warm up, they don't serve any purpose. Good luck! Bob
When running a 195 degree thermostat.....Correct me if I'm wrong.......But once the vehicle is up to operating temperature and running around 200 degrees and the fan come on and cools it down to 195 degrees doesn't the thermostat start to close and holds the temp so it doesn't go any lower than the 195 degrees?

I pretty much proved that the other day.....when I took out the 195 and replaced it with a 180 thermostat. With the 195, I was running around 203 degrees with the fan on. Put in the 180 (fan on) and it dropped to 188-189 degrees same road, same time and same conditions. I was taught the same way....after it opens it doesn't have anything to do with the running temperature. I have changed my line of thinking after doing the 180 switch and talked to a certified GM mechanic the other day. He says that the degree does determine how low it will cool before the thermostat starts closing and will hold the temperature so it goes no lower than the stated degree for that particular thermostat.

I do appreciated everyone's replies~~~~~~Ron
Reply With Quote Quick reply to this message
  #20 (permalink)  
Old 01-04-2011, 09:48 AM
Registered User
 
Last wiki edit: Mopar tapered axle rear brake conversion
Last journal entry: What I'm doing now...
Last photo:
Join Date: Jan 2002
Posts: 4,267
Wiki Edits: 49

Thanks: 0
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by scrot
......So the fact that the manufactures aren't doing it should tell us something.
Yes. It tells us that with a complete factory setup in most cases the holes aren't needed. However, most of us don't run a factory setup. Just about all of us have a non stock engine which creates more heat and in many cases have a complete aftermarket cooling system. Drilling holes in the thermostat is done mainly to keep air pockets out of the system which is a common cause of overheating problems in custom cooling setups. They don't really help with cooling, but do help the system to operate properly.

I always drill 3 1/8" holes in any thermostat that's going in a custom cooling system. Its cheap insurance against air pockets which WILL lead to premature failure of critical (and expensive) engine components.

Centerline
HotRodsAndHemis.com

"Aerodynamics are for people who canít build engines." Ė Enzo Ferrari
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 01-04-2011, 12:36 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 7,095
Wiki Edits: 0

Thanks: 4
Thanked 541 Times in 457 Posts
Quote:
Originally Posted by Sweet-34
Can someone enlighten me as to drill or not to drill holes in the 180 degree thermostat on a 327 Chevy Engine. Been running a 195 degree thermostat and it runs too hot. I'm running a manifold fan sensor that turns on my fan at 200 degrees and cools to 185 before shutting off. Most people tell me to drill 3 small holes in the stat before installing.

If so......what size holes? Also, what is the benefit of doing this?

Thank you
The hole, not holes, needs only to be 1/8 inch it is there to help vent air when filling the system making life a little easier. It is not large enough to affect operating temperature, especially given the Chevy already has two bypasses the heater circuit and a flow balance return in the right head and block.

You should expect that the engine will run from 10 to 15 degrees warmer than the stamped temp on the thermostat, the reason for that is the stamped temp is the opening temperature where the thermostat's valve just cracks open, it takes another 5 to 10 degrees or so to achieve full opening.

200 degrees on a 195 thermostat is what I'd consider inside the normal range of operation. If the electric fans can pull the operating temp to 185, I say they're pretty good as at this temp the thermostat is again closed and has to recycle to open again.

If everything else is doing its job, a 185 thermostat should get you a running temp between 190 to 200 degrees.

Don't forget these things are mass produced, their functional range is probably on the order of +/- 10 to 15 degrees. To a large extent the actual operating temp say 220 to 230 as a max isn't as important as keeping the insides of the cooling jackets wet. That's to say a running loss of coolant will be far more destructive than a wet though high operating temperature, with-in reason of course.

Bogie
Reply With Quote Quick reply to this message
  #22 (permalink)  
Old 01-08-2011, 09:41 AM
Registered User
 
Last photo:
Join Date: Mar 2009
Location: Burton, MI
Posts: 818
Wiki Edits: 0

Thanks: 39
Thanked 18 Times in 17 Posts
I think people may be missing the point of the electric fans. If your fans are running while you are moving, either your fan temp is set too low, or your radiator isn't big enough.. the fans are only there to keep the engine cool while the car is NOT moving. Once you get moving, the fans should be turning off so they don't restrict air flow. (if you don't use a controller, then it's different)

i have a 160 t-stat in my car, but I have my electric fans set to turn on at 200.
and the big fan switches to high speed at 220. This way they aren't constantly running. and I can stop briefly w/o the fans cycling on and off.
I set them up this way back when I had a little 80A alternator, and the electric fans would drag the voltage down. now that I have a 110A CS130, it doesn't make much difference

my one fan controller that turns both fans on together (with the big fan being on low) has an extra wire to turn the fans on when the A/C is on.. I don't have AC so I ran that wire into the car to a toggle switch.. so when I'm sitting in the staging lanes at the track, I can force the fans to run anyway to keep the engine temp down so I'm not trying to launch with the engine temps up near 200
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
To drill or not to drill steam hole in 400 Curtis Thornton Engine 9 06-27-2008 01:44 AM
to drill or not to drill fiddyfofoad Electrical 10 10-05-2006 07:04 PM
To Drill or Not To Drill (Carb Question) leejoy Engine 40 03-04-2006 08:41 AM
Drill 1/8 hole in thermostat fat40 Engine 4 02-06-2006 02:53 PM
Drill thermostat 78 monte Engine 24 04-22-2005 09:12 AM


All times are GMT -6. The time now is 04:19 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.