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Author Topic:   over heating and more
nice_guy_wi
Dirt Roller

Total posts: 10
posted April 24, 2003 11:03 PM
Ok here is a problem we had last year and hoping to avoid this year but want you alls input on what may be causing it. We run in the bomber class. Pretty much stock 350 with MSD coil and module (locked and weight advance). Timed to 36 degrees fully advanced. And reduced pulleys. Good shroud, blade not more than an inch from the radiator, and run a restrictor. Ok now for the problem/s .... the car runs hot...during both heat races and feature. As high as 250 mabye a tad more, yes I know way too much. Second thing.... when letting off the gas in the corner you can see a flash come out both mufflers every time. Third when shutting the car off always a BOOM in the exhaust. We went through 3 motors last year and they all did the same thing. Leads us to believe it is something that made it on each motor. We had tried a different carb with same results. Any ideas? Any help would be appreciated. Sorry for making it so long, but you all always say more info needed.

rickb33
Dirt Full Roller

Total posts: 46
posted April 24, 2003 11:42 PM
radiator,if it's used,get it rodded out,or replace it.timing is probably one of your problems,not where it set,but what leads up to it.cam,timing chain,and also the distributor.the bang can be attributed to timing being off,or a real lean condition,or just the opposite(to much fuel.which could have something to do with the motor changes.what rpm are you setting it at. usually its best to run it at about 3,000,when setting it.a bad radiator,bad timing,and a neglected cooling system in general can be reason for sitting at 250 degrees.there is a bunch of different things that can cause these things to happen.start with the small stuff first,and then move on to larger items.always document changes,and keep it close to you for quick reference.

rickb33
Dirt Full Roller

Total posts: 46
posted April 24, 2003 11:56 PM
by the way,if your in a relatively warm climate,ditch the restrictor in the water neck,run water with a conditoner,and a few(few)drops of dish washing liquid,this keeps the water from steaming when it hits a hot surface.its worth anywhere from 10-15 degrees by getting rid of it.use the biggest fan you can fit in the car(if your using a fan clutch,also ditch that.those type of parts are made for regular driving and not racing,and don't help you cooling a hot running race car.put some time,and money in to your cooling system,and put a lot of emphasis in to building,and setting up your motor to run cooler.if you throw used(worn,bent) junk in with new stuff,all it does is wear out the new stuff quicker,maybe even at start up.read up on this forum,on all the different forums,rather a street,or a sprint.read all the stuff.

racer17j
Dirt Forum Champ
Total posts: 1565
posted April 25, 2003 01:34 AM UIN: 54865418
lose the reduction pullies and go to a 1-1 set up reduction works good in alky motors not gas. the boom and flames from the pipes are from excess fuel that didn't burn in the cylender igniting with the heat of the pipes we had the same thing in our cruiser car because we had to run on 7 cylenders never failed every time we shut her down sounded like a gun shot lol. i'd look into the jetting and maybe a hotter plug to burn that fuel

racer2
Dirt Maniac

Total posts: 166
posted April 25, 2003 08:27 AM
dont run a restrictor with reduction pullies.
a friend of mine took his out and so far he is running cool

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