Visit The Dirt Forum for More Information

Author Topic:   one more time lol
Whitelightning
Dirt Freak

Total posts: 429
posted March 02, 2005 09:36 PM  
I know this topic has been over a million times but just wanted some other opinions about this. I have been running, 350 flat top 30 over engine with 76 cc heads shaved to 70 cc, quadrajet carb , 3 row radiator , stock pulleys, 6 blade steel fan in shroud, cut out themostat for restrictor. This engine would run 160 idling all day hot or cold weather it did not matter, under race condition 180 maybe 190 at end of race and never above. So over winter I did some upgradeing. I put a set of 462 heads on it that where took to machine shop and worked, since I was getting good heads a bounght a griffin aluminum radiator, 25% reduction pulleys. Now everything else is the same, however idling it will get to 190. Should I start worring or could this be just normal. I did go ahead cut out my nose peice and remove the restictor which both were not done when I let it run last time when it got 190. I just worried that I ahe the wrong pulley or radiator set up, so maybe the one running a similar set up can help me. I really hope it was cause it was setting still and it will cool better moving. What ya think guy thanks

TEAMPCR
Dirt Freak

Total posts: 238
posted March 03, 2005 05:54 AM  
I would put in a good high flow water pump to compensate for the reduction pulleys. The smaller combustion chamber in the new heads is going to raise the compression ratio, thereby raising the temperature. You may also want to check and make sure you're not running too lean. That will increase your temp, also

dirtracer14
Dirt Forum Champ
Total posts: 1261
posted March 03, 2005 10:31 AM  
I would put the other pully back on.....see what it does.... i went to 1.1 last year and will never run reduction agin!!

stockcar5
Dirt Forum Champ
Total posts: 578
posted March 03, 2005 10:49 AM  
you also have more compression with the 64cc heads. more compression=more heat generated. 1 to 1 pulleys should do the trick.

------------------
www.geocities.com/dirtstockcar5

racin78p
Dirt Freak

Total posts: 333
posted March 03, 2005 07:41 PM  
If you are running race power steering, and turning over, say 6500 rpm, then matching pulleys (1 to 1) will poop fluid and possibly the power steering pump to next week. I did. Reducing the lower pulley (to 25%) slows the pump down. I had a overheating problem with my sbc/ 85" Regal/Factory stock in the beginning of last year. Drilled holes for air flow to the radiator in the front bumper cover, covered all openings in shroud/rad area, got the fan to be 1" from the opening of the shroud and WALA! Got rid of thermostat and ran a 7/8" restrictor. Dropped temps to under 190 at pace lap speed. When racing temp never got above 205. And it gets hot here in KANSAS during the summer. The air flow across the rad and engine when moving at race speeds will drop your temp fast. Keep that in mind.

------------------
racin78p
if it ain't fun, then don't run

eaton89
Dirt Freak

Total posts: 268
posted March 03, 2005 09:07 PM  
We race in 90 to 100 degree weather all the time. 1 to 1 pulleys good shroud, fan, water pump and radiator. I run a 5/8 restrictor and I run about 210 in the race withe same engine combo. I tried everything and untill I put 1 to 1 pulleys I was either getting hot at the end of the race or I would throw the belt off at 6800.

eaton89
Dirt Freak

Total posts: 268
posted March 03, 2005 09:10 PM  
Also I havent had any problems with power steering pumps. Havent burned one up or spilled its guts yet! LoL

Whitelightning
Dirt Freak

Total posts: 429
posted March 04, 2005 04:41 AM  
Thanks all for the help. I have found out that my car was running really lean due to a carb malfuction. Old sorry Q jet was only squirting out gas on one side and it was only trikling good then, so I got new carb on the way that i will try before changing anything but I think the pulleys may be part of the problem also. Thanks again

Back to the Archives