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Author Topic:   Running hot?
dirtracer14
Member
posted August 12, 2003 11:51 PM
I am looking for any way to help keep my temp down... I will try to help with what i have and what i have tried. I have a 16"x22" rad that sits low in the car and the fan is above the top about 2 1/2" there is also a peice of tin at the bottom in front to keep the mud out wich only leaves 12" of rad exposed to incoming air. I have the kse pulleys the cog type with a plastic fan about 15" dia...about 1 1/2 from rad. I have tried about 3 dif types of fans. I have a allum water pump that i have chnged 2 times. I have tried 160,180 t stat and a 5/8 restrictor. I have chnged jets up and down 6 to 9 jets sizes. I also ran water from the back of the intake to the front of the intake. I also have tried timing up and down. Now what else will make a motor heat up...i really think its somthing that i have done i have had 10 diff motors with 3 dif dist and 3 dif water pumps and 5 dif carbs 3 dif cams from 3 dif manufactures... I have about 3 feet of exhaust pipe on each side 3 1/2" with the straight threw mufflers and turn downs...also run super traps with from 9 to 25 disks in them. I also have put tin on both sides of the nose to help direct the air. I see guys all the time running 140 or 160 till they race then only get up to 180 or 190....i can get to 180 in less than 10 min and it keeps going and never seems to cool down? What am i missing here....I have looked at tring to put a shroud but i am not sure how to go about it to make it work right and not be made of cardboard and duct tape....i would use it if it worked. Sorry this is so long but it has really been bothering me for the last 4 years....I mean im the guy that i start drive to the line up ...shut it off till its time to go on the track....i mean i dont start till they wave us on...then hope for not to many yellows. I hope that you guys can give me some ideas or maybe a way to build a shroud with what i have in my shop? Thanks, Craig Moore


racer 4
Member
posted August 13, 2003 12:40 AM
After losing a motor i checked the rad fins to make sure they are not swelled up and they look good...i also cleaned the inside so it looks like new.....yes they are pricy for a new one but i think i might try to fit a 19" in there


maxwell
Member
posted August 13, 2003 09:41 AM
Run a 19 in 4 blade fan with some kind of fan shroud.2)make sure your rad. filler neck is higher then your intake.3)Make sure you get all the air out of the system by bleeding fill it up and leave the cap off with it running for 10 min.4)run 1 to 1 pulleys.5)take rad. out of car and soak it in water for a couple days then blow it out with air.first tap rad on the concrete to get the dirt out before soaking.6)run no restrictor in the housing.7)make sure your hoses are not closing up under pressure.8)run disstille water with a little anti freeze for water punp lube. clean rad. is a big thing. do you soak your rad. ever week?

[This message has been edited by maxwell (edited August 13, 2003).]

jonniet
Member
posted August 13, 2003 01:46 PM
I think Maxwell is on the right track,...Many moons ago when I was just starting out in limited sportsman cars I had a problem over heating ...I could run the car in the driveway for half an hour and never get above 190 but as soon as I got into the race and quit paying attention to my guages after about 10 laps I would start loosing power and smell things start to cook ...Keep in mind I was in my second season of competition and I didnt realy pay attention to what the car was telling me untill it was to late ......Long story short after cooking 3 motors and the season was over I finaly discovered my radiator was to low and I was getting a steam pocket in the cooling system once the car was in motion....good luck ,its awful hard to race when your worried about overheating.


Toywagon
Member
posted August 13, 2003 05:47 PM
Another thing to check, or recheck.

Make sure your timing curve is where you think it is. Depending on what dis. your running, you could have total advance higher than what you think you have.

Also, check the guage against another new one, or borrow someones infra red temp gun and shoot different areas of hoses, heads, intake etc. make sure that guage isnt fibbing and causing you stress, when everything is actually ok.

Jim

dirtracer14
Member
posted August 13, 2003 08:44 PM
I did do the temp gun thing that when i really got worried....head reads alot hotter than intake..Yes my rad fill is below the water neck....is that i big problem??


jonniet
Member
posted August 14, 2003 12:35 AM
you definitly want the radiator filler neck higher than the water neck on your intake or you will have overheating probs,I run a filler neck on my intake manifold and use the one on the radiator as a air blead (I have two 21 lb radiator caps) I never have heating problems ,but I am running methanol a little on the rich side.....check things out and let me know what you find.


Toywagon
Member
posted August 14, 2003 08:22 AM
I run the fill necn on the intake as well. I run 150 in the pits, 190 on the track, and will cool back down to 160 if we run very many caution laps. On alcohol here too.

I re-read your post, and you have tried a lot of changes to still have this problem. I would definatly go to an intake mounted fill neck.

The only things that you havent replaced, are the radiator, and where its mounted. The problem doesnt seem to change as youve changed engines/ignitions etc.

Jim

maxwell
Member
posted August 15, 2003 07:50 AM
what does a intake fill neck do ? And why would this help could someone explain?


driver27
Member
posted August 15, 2003 08:14 AM
Be careful how low you have the radiator sitting also. If it sits to low the pump will not be able to move the water. If your radiator is lower that the lowest part of the frame rail on the passenger side its probably too low. Check with Afco about radiator locations and see if yours is too low.


towmandan
Member
posted August 16, 2003 09:58 PM
If your radiator is that low then your never getting the engine completely full of water like the other guys have posted you can get the filler for the intake I have used one from moroso that went in the middle of the top radiator hose anything to get water to the block...let us know what you find out....Towman


Going Strong
Member
posted August 18, 2003 08:41 PM
Well i raised the rad up 1" and made sure it was square with the fan...was at a angle. I also filled the top hose up with water and stuck it on to make sure it was all full. The temp was better but it wasnt very hot out. I think that i will go with a better water pump.....it cools better at high rpm and heats up at slower.....Thanks for all the help on this topic i only have a few races left then i will replace and rethink some stuff....thanks again!!


LimitedMod18
Member
posted September 06, 2003 08:04 PM
use purple ice it really works get bigger fan


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