Quote:
Originally Posted by Speedwaypj
Update:
- I R&R intake gasket with Fel-Pro which block the exhaust cross-over.
- I used the "Cooling System Vacuum Purge And Refill Kit" to try to eliminate any air pockets.....it actually worked pretty well.
- I did add the bleed lines to the intake. I drilled a hole in each intake side matching the (blocked) head water ports. Tapped (1/8 NPT) for small hose fittings and connected them with a "T" and then ran it to the gooseneck.
As I mentioned previously the radiator is new; but I have taken it off again and back flushed.....seems to flow fine.
- Results. ( 80+F) ...not much difference.....(I have an in-line radiator cap - no surge tank yet - on order)....I used a "Spill-free-funnel" to be able to monitor it.
- It pushed out about a pint+ or so....it started from about 5 minutes on.
- Also notices very tiny bubbles occasionally....from 15 minutes and even some at 45 minutes.
- I also ran a Strong garage fan on the radiator the whole time....at 40 minutes it was at 195,....when I turned the Fan off for 3 minutes, it went to 210; turned fan back on and it went down to 205.
- When I revved the engine for a minute it would drop a few degrees.
My goal is to keep the mechanical fan, build a better shroud and add two front fans (ERA type). (yes I'm sure the Mark VIII fans would work best).
Next - integrate the expansion/surge tank (and overflow tank);
- Maybe get an undersize water pump pulley.
Again, thanks all!
PJ
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"Since a belt-driven fan increases speed (and airflow) with engine speed, it can move more air at higher engine rpm - usually above 2,400 rpm - than an electric fan. Conversely, electric fans move more air than belt-driven fans at engine speeds below 2,400 rpm in typical applications."
Source:
https://www.flex-a-lite.com/blog/whi...lt-driven-fan/
In what RPM range are you experiencing cooling issues? Lower RPM, as you indicated "When I revved the engine for a minute it would drop a few degrees."
Electric fans run the same speed regardless of engine speed. A typical electric fan is going to be turning 2,000 - 3,000 RPM - even when your engine is idling. Your flex fan, OTOH, is directly linked to engine speed. Even if you're running a 20% overdrive, at an 800 RPM idle speed it's turning 960 RPM - less than half of what an electric fan will be turning on LOW.
In addition, most higher CFM electric fans like the one for the Lincoln Mk VIII, are using curved scimitar blades which are more efficient both for power and for air flow. Your straight-bladed flex fan - uh, not so much.
Finally, the shroud on an electric fan almost certainly has much smaller clearances to the fan than does your shroud. Mechanical fans are attached to the engine and the engine moves, so clearances can't be as tight. Tighter clearances mean more airflow.
In no characteristic is a mechanical fan superior to a modern electric fan. If you believe the nostalgic look is more important then go with it - but be prepared to accept its many limitations.
Garage cooling fans are great, but you're not getting 2,500 - 3,000 CFM ducted through your radiator. Get your hands on a good electric puller and try it out - even if just to satisfy curiosity. I believe that will solve your problem.