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Author Topic:   HOT, HOT , HOT
DOUBLE J
Dirt Roller

Total posts: 13
posted June 10, 2001 01:09 PM UIN: 21
OVERHEATING I RUN A OLDS BODY WITH A MONTE NOSE 4" PULLEY ON BOTTOM & A 5" ON TOP NO WASHER IN NECK TEMP RUNS COOL IN HOTLAPS & HEAT RACE BUT WILL RUN 230 IN 15 LAP MAIN I HAVE HAD A BUG SOME WHERE MAKING THE ENG HESITATE WHEN YOU PUT YOUR FOOT IN IT AND SPUTTERS DOWN THE STRAIGHTS I HAVE CHANGED PLUGS,WIRES,CAP,BUTTON,DIST,COIL,TRIED RUNNING A LITTLE RICHER&LEANER NOTHING HELPS HAVE NOTICED #1 #2 PLUGS HAVE BEEN A LITTLE DAMP WITH GAS WHILE THE OTHERS ARE BURNING CLEAN IM THINKING ABOUT CHANGING POWER VALVE OR CARB .
ANY SUGGESTIONS WOULD BE
GRATELY APPRECIATED

DOUBLE J RACING 21

Pickel
Dirt Freak

Total posts: 243
posted June 10, 2001 08:57 PM UIN: 25419780
check your vent in your fuelcell.. it may be clogged and not letting the fuelcell breathe. it will also make the car run hot. I have run into a similiar problem with my car sputtering down the straight away and a little hesitant.

[This message has been edited by Pickel (edited June 10, 2001).]

DOUBLE J
Dirt Roller

Total posts: 13
posted June 10, 2001 09:43 PM UIN: 21
THANKS PICKEL, NEVER THOUGHT OF THAT. I'LL CHECK TOMORROW AND LET YOU KNOW. THANKS AGAIN!!

3mracing
Dirt Roller

Total posts: 17
posted June 11, 2001 01:12 PM
How would a plugged fuel cell breather cause the car to run hot? He would notice the plugs running lean if the carb wasn't getting enough fuel.

Hobbystocker
Dirt Roller

Total posts: 19
posted June 11, 2001 09:44 PM
You might want to check the timing and make sure it is where you want it.If it's off just enough that may cause your overheating problem also.The extra laps you run in the main may give it the added time it takes to get it hot.Also make sure you are running a "racing" radiator cap and not the stock one.

Oldsmobile13
Dirt Full Roller

Total posts: 66
posted June 13, 2001 01:02 AM
It could be a timing problem like hobbystocker said, but it is also likely to be any other ignition problem. A very small hole in your fuel line will suck air and never leak and that is also possible, more likely than a cell breather.
Good Luck

sdhnc29
Dirt Forum Racer

Total posts: 78
posted June 17, 2001 11:14 PM
DOUBLE J ,

If you want to find your problem quickly , try and find some one in your area with a Dyno Jet chassis dyno . In less than an hour , you can cover everything that will take you 3 weeks of racing to find . If you can't locate anyone with a dyno in your area , give me a call at 828-286-0780 . I'm in Rutherfordton NC , and we have a Dyno Jet chassis dyno . We help racers every day with similar problems .

Steve

awkwardjeff
Dirt Freak

Total posts: 223
posted June 18, 2001 12:16 AM
DOUBLE J, Buy yourself a leak down tester. take all the rocker arms off, all the plugs out and see where it's going. a quick check is to start the motor and look for bubbles in the radiator.........
If you have a head gasket leaking a little it will stay cool for a short race, but run hot in a feature.
I post my thoughts on leak down test on the modified side of this board........everyone should own one. our motor ran 180 in the heat race friday, 230 in the feature......then on Sunday again the same thing...........I leaked our motor to find the head gasket was out , I took the heads off this past week and found nothing more to fix. this is a 400 block, and we run 14.3 compession, OUR head gaskets have a life span of about 12-14 nights of racing.....I leak our motors every few nights. Since I started doing this years ago we haven't melted any pistons.........before that we would melt a piston or two every year.....
Jeff

Stonewall
Dirt Roller

Total posts: 20
posted June 20, 2001 10:01 AM UIN: 10024185
I was told something recently which to me, makes a lot of sense. You said that you do NOT run a "washer" in the neck. That to me means you don't have anything in the thermostat housing restricting flow. If you are getting very high flow thru your radiator, the fluid really won't have time to cool down. If you RESTRICT the flow, thereby slowing it down, it will have more time to cool.

Also, you never mentioned if you have a FAN SHROUD. I was fine for the first 2 races on cool days but when the hotter days came I started overheating. I manufactured a fan shroud out of sheet metal and the last race (a very hot day) it stayed right on 190 for both the heat and the feature.

...Stonewall

Hobbystocker
Dirt Roller

Total posts: 19
posted June 20, 2001 04:10 PM
Stonewall may have hit it right on the nose.If you do not restrict the flow of water to some extent it will run through the engine and radiator so fast it does not have a chance to cool.The longer you run the hotter it gets.The shroud is always a good idea to have no matter what.We also run a "shaker" screen in front of the radiator as well as the normal screen.One other thing we do is regularly run a garden hose BACKWARDS through the radiator fins to get rid of packed in mud.Low pressure of course.It may look clean from the front but you would be suprised how muddy it is when you run water from the backside. Let us know how things turned out ok.

Deek
Dirt Roller

Total posts: 19
posted June 20, 2001 04:42 PM
Go to www.stewartcomponents.com and read up about cooling issues. It'll help clear up issues on restrictors and cooling.

kkparks_3
Dirt Roller

Total posts: 17
posted June 20, 2001 11:47 PM
You could take off every other blade in your water pump to help slow that flow of water. We do that and it seems to help. Others have told us this also.

Kevin

BDS
Dirt Roller

Total posts: 7
posted June 25, 2001 03:26 PM
Like the above post mentioned.... go to the Howard Stewart web site and read the tech. The main thing to remember with cooling is to move the water as fast as you can out of the block. The faster you move water the faster you move heat! Your radiator will do just fine in cooling the rapidly moving water. If you running 6200 rpm then turn you pump the same (1:1). Get rid of the restrictors, use a good pump, 28lb cap, shroud your fan (cover half the blade pitch).

4s racing
Dirt Forum Racer

Total posts: 77
posted July 20, 2001 05:24 AM
I am a little late on this issue but i had the same problem in my pure stock.over heating and sputtering in the 20 lap main.I corrected my problem by rerouting the fuel line away from any heat sourse. the gas was boiling in the gas line rite before it went to the carb. therefor causing the the motor to miss and run hotter than normal.Just my 2 cents worth.

fast19
Dirt Newbie

Total posts: 3
posted July 23, 2001 02:31 PM
Listen to all that Howard Stewart (Stewart Components)recommends on his web site, especially reguarding NOT USING thermostats or restrictors not using reduction pulleys. You will not run hot if all ( or most)recomendations are followed. Read the tech advice and get to understanding your cooling system, you then will understand why the myths and secret fixes don't help. Good luck

wannabeDIRTdriver
Dirt Roller

Total posts: 7
posted August 12, 2001 10:57 AM
change the carb if it is not any of those things, we had that sputtering problem with our late model and we changed carbs. we won that night too.

racer2
Dirt Full Roller

Total posts: 29
posted August 12, 2001 09:03 PM
i had a pick up in the distibuter do the same thing Sputtering,would not go past 5,500.

engine
Dirt Newbie

Total posts: 1
posted August 15, 2001 09:12 AM
HEY AWKWARDJEFF, EVER THINK OF RE-TORQUING YOUR HEAD BOLTS? IF YOU ONLY GET 12-14 NIGHTS ON YOUR HEAD GASKETS YOU SHOULD TRY THIS. YOU SHOULD BE ABLE TO RUN THE FULL SEASON.
quote:
Originally posted by awkwardjeff:
DOUBLE J, Buy yourself a leak down tester. take all the rocker arms off, all the plugs out and see where it's going. a quick check is to start the motor and look for bubbles in the radiator.........
If you have a head gasket leaking a little it will stay cool for a short race, but run hot in a feature.
I post my thoughts on leak down test on the modified side of this board........everyone should own one. our motor ran 180 in the heat race friday, 230 in the feature......then on Sunday again the same thing...........I leaked our motor to find the head gasket was out , I took the heads off this past week and found nothing more to fix. this is a 400 block, and we run 14.3 compession, OUR head gaskets have a life span of about 12-14 nights of racing.....I leak our motors every few nights. Since I started doing this years ago we haven't melted any pistons.........before that we would melt a piston or two every year.....
Jeff

Roadhzrd
Dirt Maniac

Total posts: 102
posted August 27, 2001 02:14 AM UIN: 28276986
Something else you could check that would also tell you if the radiator is clogged or if the fan is close enough to the radiator is to see if the fan will suck a paper towel up to the radiator.

ASToad
Dirt Newbie

Total posts: 3
posted October 02, 2001 12:43 AM
I had a miss and hesitation like that once and it turned out to be my fuel pump, kinda gives you the feeling of a blown head gasket. And by all means, run a washer in that radiator!]

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