motor overheats..please help

Old 01-06-2009, 05:37 PM
  #1  
rechek5
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Sep 2007
Posts: 2
Default motor overheats..please help

i run a street stock class on a small small 1/4 mile so were not going very fast which means not much airflow
motor is pretty much a stock chevy 305 i run a hei dist. and a 2bbl rochester carb
radiator is a 3 core gm radiator
i have tried both electric and manual fan with shrouds..
i cant run a whole feature event without the motor getting so hot it pushes most if not all the water out of the radiator... please help
rechek5 is offline  
Old 01-06-2009, 06:14 PM
  #2  
fla1976
Senior Member
RACING JUNKIE
 
fla1976's Avatar
 
Join Date: Aug 2007
Posts: 1,523
Default Overheating

Check to make sure your radiator cap is good. If it is weak or leaking it will cause the water to boil at a lower temperature.
fla1976 is offline  
Old 01-06-2009, 07:17 PM
  #3  
lookingaround
Senior Member
RACING JUNKIE
 
Join Date: Feb 2006
Location: Lenoir City Tennessee
Posts: 864
Default

what about a thermostat or restrictors in the thermostat housing to slow the circulation so it can cool it
lookingaround is offline  
Old 01-07-2009, 02:48 AM
  #4  
itsabird
Senior Member
RACING JUNKIE
 
Join Date: Dec 2007
Location: ohio
Posts: 816
Default

try back filling the engine, makeing sure there is no air in the system, and if you are not useing it now, try water weter, good luck.
itsabird is offline  
Old 01-07-2009, 03:02 AM
  #5  
TopspeedLowet
Senior Member
DYNO OPERATOR
 
Join Date: Apr 2008
Posts: 504
Default

Have you concidered that the cam timing is too advanced. This is a common problem with many stock chevys using towing cams. The other likely player would be a EGR that never shuts off. Sometimes the EGR gets hooked up to a vaccume source that keeps it active under full power. That will cook the intake and cause the engine to run lean. Then are you possibly running real lean?
Food for thought..........
TopspeedLowet is offline  
Old 01-07-2009, 05:50 PM
  #6  
rechek5
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Sep 2007
Posts: 2
Default

there is no air in the system
have tried water weter
have tried a thermostat and reducer
plugs actully looked a little on the rich side
and cam is a comp 260h and degreed to what comp wants it at
rechek5 is offline  
Old 01-07-2009, 11:58 PM
  #7  
cepx111
Senior Member
RACING JUNKIE
 
Join Date: May 2006
Posts: 2,044
Default

Like above mentioned I'd try a new 15 to 16 psi cap first -thats a cheap fix.

Other thoughts....

I'd go with a bigger raditor if the rules allow, you might also consider a aluminum one if you can spare the change, they really make a difference.
Also a aluminum high flow water pump will make a big difference too - they can be had for around 50 bucks just about anywhere, I got mine from a vendor on here.
Goodluck, Charles
cepx111 is offline  
Old 01-08-2009, 09:39 AM
  #8  
kwkracing
Senior Member
RACING JUNKIE
 
Join Date: Dec 2004
Location: austin texas
Posts: 729
Default

either the water pump isnt pumping, maybe the shaft broke off, maybe its full of rust or the thermostats stuck.
kwkracing is offline  
Old 01-08-2009, 04:21 PM
  #9  
demo1976
Junior Member
SHOW GUEST
 
Join Date: Jan 2009
Posts: 3
Default

i dont have any ideas for you to try but i also run a 305 with a 260h comp 2bbl and hei.. our motors are almost twins.. lol
demo1976 is offline  
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -