a little too hot

[powerslide]

You dont have the fan everyone suggests, some claim this will lower it 15-20degrees alone. I will report back next time i run mine, i was 230 coming off the track last time.

http://www.amazon.com/ACDelco-15-807...productDetails

442 Fan alone brought the temp down to 180 coming off the track. Might have to put a thermostat in now.

[andy16]

i appreciate all the info... as it stands i left the carb alone it has no dead spots but the plugs sure look clean i wouldn be afraid to go up some more on jet or squirter or pump cam, the accelerator pump is set correctly w the black pump cams on both sides set in position 1. i got a 15" 4 blade gm fan with a bud box shroud and the shroud is perfect i run a md3 nose w lower valance i have no holes cut in it anywhere. went from a 240 degrees w no shroud and a 17" 6 blade to 270 degrees w the shroud and the 15 inch fan. it got worse? the fan is half in half out exactly how it shoul be. ill post pics later this week of it all . running straight distilled water. everything is clean. turned 7800 this weekend we only got to practice race got rained out but was already overheating... may just switch notors and see if it is something w that motor? oberg is clean oil temp is 250-270 engine runs fine?

[setup479point2]

Sounds like a blown head gasket. Engine shouldn't get that hot that fast.

[andy16]

gonna do a pressure test on cooling system and cyl leak down test this week if nothing comes up switching motors. if i switch motors do i stay w the shround n small fan or go back to large fan w no shroud? standing at the carb while engine is running i can notice a big differnce in air blowing on me from the 6 blade to the 4 blade and the 6 blade is moving more air from what i can tell?

[Egoracing]

At idle the 6 blade should move more air but at speed it is more like a wall as is spins and the blades flatten out.

[Mod77L]

This may be a dumb question, but have you tried a different radiator? Sometimes when you overheat, you can "pop" the cores, they change shape and collapse the area between the fins. This blocks air coming thru the radiator. I chased my tail for weeks looking for what was wrong. I should have tried a new radiator first.

[powerslide]

Im betting the 15in 4blade doesnt have the pitch that the 19in 442 fan has. I had a 15in 4 blade and it has about half the pitch of the 442 19in fan. Post some pics/video of the setup you have. Then go to this website and get one of these http://www.amazon.com/ACDelco-15-807...productDetails.

[andy16]

i ended up not really finding a problem with the motor but it is new to me this year has a practice and about 4 races on it and it just keeps getting hotter and hotter so i pulled it will send it to get looked at later. i put my regular motor in spaced up the engine about a half inch put my 19 inch allstar fan on took 15 inch fan and shroud off, drained out all the sonoco 260gt gas and went back to vp 110 purple. ive ran this motor with this fan and that fuel all in another car w no overheating problems so i should be fine. once i establish a baseline with this motor combo and all is good and cool im going to switch back to shroud and little fan and see what happens if its still cool then im going to switch back to the sonoco its cheaper and easier for me to get ahold of if its still cool then im sending motor to get freshened/looked at.

the 15inch fan appears to have a 45* pitch if i put angle finder in middle of the blade. i dont know what pitch the 19 fan is but ran it on other cars before and stayed cool. will get some pics up by sat night got alot to do still

[Egoracing]

Are you running the same carb on both motors? 260GT is oxygenated fuel and the jets would need to be larger than when you are running VP110 or the engine will be running lean and causing it to get hot and could melt the engine down.

[9car]

what pitch is that AC delco fan?

[Barbecueboy]

You mentioned that nothing spewing out and engine running fine.......bad temp gauge maybe?

[powerslide]

This one says its 32 degrees. http://www.jegs.com/i/GM-Performance...05442/10002/-1