I have a pair of Whippled 525 EFI motors that I am getting freshioned up at a very reputabil shop. When it is all said and done the motors will have a complete over haul minus the cam(he said didn't need) it will be .060 over with new JE pistons running about 6-7 lbs boost, he thought 740-775 HP on dyno. My issue is I want to get rid of the closed cooling system but I want to run a thermostat. I was told to do this we would need to reenvent the wheel. I have a pair of cross overs with the pullie to keep my surpentine belt but still no thermostat. I am scared that no thermostat will affect the fuel curve since the water in Iowa doesn't warm up until July- August. He said he could change the computer to do what ever we need. Which is the best way to go here?
Thread: Whippled 525 EFI delima
Results 1 to 9 of 9
-
06-16-2009 11:59 PM
Last edited by ozarkdevil; 06-20-2009 at 12:03 AM.
-
- Join Date
- Oct 2008
- Posts
- 4,796
06-17-2009 06:45 PMBest thing to do is to listen to Dustin Whipple. They put a ton of time into engineering that package and they know what works.
Why do you want to ditch the cooling anyway?
-
- Join Date
- Oct 2008
- Posts
- 3,107
06-17-2009 06:59 PMAluminum heads so I would do all I can to keep the freshwater cooling system if I could.
-
06-20-2009 12:12 AM
-
06-21-2009 08:10 AM
I'd wait to see if the heat exchanger can keep up before ditching it. The closed system with dexcool is good protection for the engines components, ie aluminum heads, iron block.
-
- Join Date
- Oct 2008
- Location
- New Port Richey
- Posts
- 737
06-21-2009 11:15 AMI would not ditched the close cooling at most any cost. Tap water will do better than anitifreeze mixes and some additives work also. I would optimize what you have.
Steve
-
- Join Date
- Jan 2009
- Posts
- 207
06-21-2009 12:37 PMCall,Ray @ Raylar. He upgrades the 496 exchanger you can do the same. If you are using the drive as the water source, blook it off add 2 transom mount pick-ups which will carry enough water volume with the 1.250" hose to cool it instead of the 5/8" hose restriction that merc. has. Get a full shower top plate that covers the drive add a 3/8 npt-#8 an with fittings and stainless hose, drill and tap the port side of the drive upper add a 1/2" npt -#8an 90 degrees and you 'll cool your drive better so the oil doesn't turn black. I would either up-grade the exchanger and add the pick-ups.
www.merperformancemarine.com
843-399-8785
-
- Join Date
- Oct 2008
- Posts
- 4,796
-
- Join Date
- Oct 2008
- Posts
- 3,107
06-22-2009 03:17 PMThe heat exchanger on the 525EFI is the same one used on the 700sci. Mercury is always super conservative with setup so I think you'll be fine with only 40-75 more hp.