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Author Topic:   Radiator Hoses
Deak-Jr
Dirt Forum Racer

Total posts: 81
posted June 03, 2003 11:26 AM  
Running 350 in a pure stock, stock water pump, 4-core radiator, thermostat. End of a 6-lap heat, temp was climbing, needled at 270. We're running stock hoses that fit the bends needed to connect; BUT, someone told me to measure how much was needed and go get the steel flex hoses in case the stock ones were wanting to collapse or "suck" shut. Any opinions on this?

ALSO -- would gutting the thermostat gain a lot? Second week out, it has overheated both weeks. Radiator front looks clean. 17" 6-blade steel fan, right at edge of shroud, and about 4" from radiator. We opened up the nose a little more and got a better screen, and also took a few inches off the bottom of the nose (it was low). Thanks.

jhon hollomon
Dirt Freak

Total posts: 468
posted June 03, 2003 11:47 AM  
I would advise running the flex hose. I always gut my thermostat. I just cut everything off of it. That's what I use for a restrictor.

Deak-Jr
Dirt Forum Racer

Total posts: 81
posted June 03, 2003 12:22 PM  
Thanks for the reply. *ALSO* -- Do you guys run antifreeze or just straight water?

towmandan
Dirt Freak

Total posts: 370
posted June 03, 2003 12:31 PM  
I have a few suggestions for you...If the fan is not at least in the shroud shim it out a little more it needs to be partially in the shroud so it wont pull outside air....Gut the thermostat....Use the hoses with the wire in them I prefer the flex hoses cause most of them have the wire molded in the rubber...If your still having problems try jetting up the carb a size or to it will usually help....Hope this helps a little....Towman

Flanndad
Dirt Freak

Total posts: 255
posted June 03, 2003 12:31 PM  
When you say the fan is right at the shroud, what do you mean?
The fan should be about 2/3rd's of it inside the shroud. I even run mine in a little bit more.
Just sitting still in the driveway, with the car running, if you put a piece of paper in front of the radiator will it suck the paper tight?
I can put my hand in front of mine and it can feel the air being pulled thru.

There are some other thing's it could be like jetting a little lean, timing not right, among other things.
Also does the shroud seal up tight against the radiator? I always duct tape mine to make sure all the air is going thru the radiator.

towmandan
Dirt Freak

Total posts: 370
posted June 03, 2003 12:37 PM  
Sorry I forgot one of the most important things is a good rad. cap keep in mind every lb. of pressure you can add to the cooling system raises your boiling point 5 degrees thats why you see people running 20lb caps and larger......Towman......Also alot of tracks dont want you to run antifreeze ( environmental reasons )

Deak-Jr
Dirt Forum Racer

Total posts: 81
posted June 03, 2003 12:43 PM  
Thanks for all the replies.

Towmandan -- I was talking to a guy who has owned stockers and works on an LM now. He was adamant about 60/40 (60 freeze, 40 water). We run straight water with some pump lubricant, and a 16 lb. cap. He tells me we're just boiling the water by using no freeze to dissipate it. I'm still wearing the "new guy" dunce cap so I'm wondering what way to go. Pretty sold on the flex hoses, though.

Flanndad -- the fan sits about 1/2" inside the shroud. We're planning to extend the shroud a little. Do you guys make your own from tin or use a plastic original from the junkyard? We got a plastic one off an old Caddy or Impala (can't remember) from the junkyard. We've got it pretty liberally duct-taped so that it meets the radiator as well as possible.

Thanks again for all the info -- don't want to cook the engine in the first month!

ryan
Dirt Forum Champ
Total posts: 776
posted June 03, 2003 12:57 PM  
Heres what I run it works well 1 to 1 aluminum pulleys, stewart water pump, no restrictor,water with some lube in it, 19 inch 6 blade fan, aluminum rad, fan half way in the shroud with no holes cut in the nose piece. It struggles to get to 190 in a 15 lap feature race. You do NOT need antifreeze.Hope that helped
Also if you get to 270 in just a few laps there is something messed up pretty bad somewhere along the line.

[This message has been edited by ryan (edited June 03, 2003).]

Flanndad
Dirt Freak

Total posts: 255
posted June 03, 2003 01:08 PM  
I bought a shroud from Port City Racing, its lightweight tin around the radiator and plastic comes out to meet the fan, I just used tin snips to get the placement right.

odb93
Dirt Forum Champ
Total posts: 537
posted June 03, 2003 01:12 PM  
Jr.

You may want to get an aluminum racing radiator.

They help.

66jj
Dirt Forum Champ
Total posts: 823
posted June 03, 2003 04:53 PM  
ANTI FREEZE LOWERS THE BOILING PT....
NEVER USE IT IN A RACE CAR.

IF YOU WANT ANYTHING BETTER THAN PLAIN WATER USE DISTILLED WATER IT WILL HELP A LITTLE.

JEFF JOLDERSMA

Smitty77
Dirt Roller

Total posts: 25
posted June 03, 2003 06:38 PM  
I agree with ryan and 66jj. Get rid of the anti-freeze, flex-fan, thermastat. Go to the tech support on stewartcomponents.com for more tips. I ran 300 lap enduros on 1/2 mile for 7 years, car ran 190 all day long. Check the plugs sounds like you may be running lean if thats the cause nothing you do to the cooling system will keep it from over heating.

jay116
Dirt Freak

Total posts: 428
posted June 03, 2003 07:06 PM  
Sorry I was so long getting back to you sounds like these guys have fixed you up already but here a quick run down...Go with the flex hoses, Gut the thermostat,your biggest gain is in the fan and shroud you cant spend to much time on a shroud its a must along with a good solid fan and I would go up to at least a 20lb cap that will raise your boiling point some too and if you dont have one fit an aluminum radiator in your budget when you can....and most tracks dont allow antifreeze....Also jet your carb up a size or two and see what happens....Hope this helps.....Towman

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted June 04, 2003 07:59 AM  
anti-freeze DOES NOT lower the boiling point of water. it raises the boiling point.

Deak-Jr
Dirt Forum Racer

Total posts: 81
posted June 04, 2003 08:38 AM  
My old man, who raced for 8 zillion years (give or take 7.9 zillion), swears by water with a little pump lubricant. The guy who is loaning us the block, and has run street stocks, swears by a 60/40 freeze/water mix.

What the #^@%>? Is it a matter of preference, or is one a clear-cut choice?

We did change our hoses -- upon further review, they may have been a MAJOR part of the problem. They were soft stock hoses and some of the turns looked a little narrower than others.

I understand antifreeze lowers the freeze point and raises the boiling point, but does it help cool any better? Does it matter to the block whether or not a fluid at 270 degrees is boiling? 270 is 270, isn't it?

Also, I've heard a few folks say that gutting the thermostat won't allow for enough restriction. ???

Didn't mean to open up a can of worms but it looks like it's done been opened.


towmandan
Dirt Freak

Total posts: 370
posted June 04, 2003 09:06 AM  
There are literally thousands of different combos we can give you pulleys, restrictors,belts,hoses,fans,shrouds,chemicals,diff.radiators what we are trying to do is give you a setup that works well on a budget.....Thanks.....Towman

URDUSTED
Dirt Full Roller

Total posts: 43
posted June 04, 2003 09:36 AM  
Stewartpumps.com is adimant about water with prestone lubricant/anti-rust. Very Very knowledgeable, lots of good info.

Deak-Jr
Dirt Forum Racer

Total posts: 81
posted June 04, 2003 09:42 AM  
Thanks again Towmandan and everyone else, I appreciate the info. Like I said, I'm still wearing the 'dunce cap' with all of this.

For laughs -- my first run at our local track last Friday, pulled the #1 pill. Went from first to sixth in a lap. D'OH!


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