Tcheairs38655

Anyone had any positive or negative experience with the Flowkooler aftermarket water pump and temp issues in the 427/425 or other high performance BB engines? Does it help cooling as the mfg says?

Thanks

Nowhere Man

To fast of a flow and the coolant can’t get cooled by the raditor and to slow will cause heat problems. The factory pump works just fine. If anything you have a air flow problem

Tcheairs38655

Oops, never thought of that. Do you think a 7 blade fan would move more air? Just happen to have one. Took it off my 67 L-79 because it was noisy..About to reinstall the 427 in a 66 soon and I've been through the cooling problems before with the L-72. Think I did use a FlowKooler on the last one I had but can't remember what the results were.

Thanks Nowhere Man

Nowhere Man

A 7 blade fan won’t hurt. There are thousands of threads on this and if you do a google search for corvette cooling 101 written by our own John Hinkley aka JohnZ you will get all you need to know

Tcheairs38655

thanks Nowhere Man. I sent you a pm with another question. Hope to hear from you soon TC

69427

Please show me one instance where that has ever occurred in a Corvette.

aworks

I'v had my share of big blocks in Corvettes, Impalas even trucks. Never used anything other than stock water pumps, stock fans and shrouds. Never had over heating problems. A 7 blade sure won't hurt.

Tcheairs38655

[I]used a 7 blade on an air 67 L79 for a couple of months. It was installed by the vintage air installer. I guess he assumed it would be necessary on the 350 hp motor. I Couldn't even hear the motor for the fan noise. Guess it


could have been the clutch but I switched to the 5 blade and a new clutch and am enjoying the strong growl of the little 327. Would be nice to hear from other 7'blade users on this. Now that it's hot outside we'll see what the temp does. We all know it all about airflow through the radiator and the heat transfer capability of the core (assuming the idle advance is set correctly) for driving in traffic.

wmf62

I use a 7-blade flex fan, don't like to depend on a 'clutch' working or not working....

Bill

Nowhere Man

I work in a manufacturing plant that makes radiators for Boeing and other military air craft. we spend countless hours making sure each part flows at the correct rate at the correct temperature for a reason. the same logic can apply to our cars and I am sure GM did the same research years ago. Maybe Tom Dewitt will see this and comment

Pushed2dmax

I would not recommend a Flowkooler for your big block. I called the manufacturer and had them give me the correct part number for a big block c2. They only had one part number available. After spending a lot of time painting and installing, I figured out that my stock pulley would not work on the pump. Shaft was too big and bolt circle is different too. Wasted more time trying to find a pulley that would work; was unsuccessful.

I ended up using a Edelbrock Victor pump. They are $$$ but are a really nice piece. I believe it does a better job at low rpm than anything I've ever used. With a Dewitt radiator and stock fan and clutch, i'm cooling 600hp with no issues.

SI67

I have always wondered about the logic of this idea. Each given amount of water that spends less time in a given time period in the radiator getting cooled ALSO spends less time in the engine picking up heat.

And yet, as Keith so rightly points out, a lot of engineering goes into figuring out flow rates for cooling systems. I don't know how that analysis is done, but I may read up on the subject.