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Saturday Night Racer >> RACE TECH >> RUNNING HOT? READ THIS. I fixed 10 year overheating issue over nigh
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Message started by imracin68j on 09/02/14 at 9:54am

Title: RUNNING HOT? READ THIS. I fixed 10 year overheating issue over nigh
Post by imracin68j on 09/02/14 at 9:54am

I've battled hot engines forever. I don't think I've ever left a track under 220. The average for me is 225-230. I've tried every style of radiator. I've put different restrictors, cap psi etc. Tried a multitude of pumps and nothing really changed. This week I changed the obvious. The Pulley ratio. I have been running a reduction since I started running as everyone thinks that's what works best. I went from a 30 percent to 1-1 and I went from 230 - 170. I thought my gauge was broke. The motor got up to 200 on a long stretch but then actually cooled down on the yellow to 175. The fan is really blowing air under yellows as well. It has to do with how long the water is staying in the block. I'm on a 3 pass radiator right now and it magnifies the issue of keeping the water in the block too long. It was close to the same with a 2 pass. I will never use anything but a 1-1 pulley on a 2-3 pass radiator again. I came in the pits and usually that's when she really likes to heat up and instead cooled down. I drove into my pits around 175. I may need a smaller restrictor. Days of dumping water out of the motor are gone.

Title: Re: RUNNING HOT? READ THIS. I fixed 10 year overheating issue over nigh
Post by over4t on 09/02/14 at 12:19pm

We echo your first sentence Billy. Went to 1-1 pulleys a couple years ago with a single pass and got, maybe, a 5 degree drop. Tried a double pass with 1-1 with another 5 degree drop. This was on our 12.5-1 355.
Mid season last year went to a 3 pass FSR, 1-1 on our 14-1 385 killer engine and couldn't get it over 180 even on 100 degree nights. Happy as hell. Grenaded that engine 2 nights into this season, put the lower compression 355 back in and went back up to 220+ with the same cooling setup.
Guess we'll try the same setup on the 9.5 pump gas big bore, short stroke engine that's the next project and see what happens with that. If that doesn't work maybe I'll try 3 air cooled flat four VW engines stuck together. :o ;)

Title: Re: RUNNING HOT? READ THIS. I fixed 10 year overheating issue over nigh
Post by dositmat on 10/24/14 at 11:32am

What kind of RPM's are you running?

Title: Re: RUNNING HOT? READ THIS. I fixed 10 year overheating issue over nigh
Post by over4t on 10/24/14 at 12:16pm

7,200-7,600 for us , depending on the engine/carb combo.