I'm certainly willing to try a faster WP speed since that is relatively easy to do (compared to a new radiator), although I'm a bit wary of 30 or 40% overdrive... Not worried about throwing the belt, but of cavitation in the pump.
Today I've been searching for a pair of single-groove pulleys with faster than 0.95 ratio, but haven't been able to find anything either aftermarket or "pre-owned". The new ones are all "performance ratio" which is the exact opposite of what I'm looking for...
Since I have a big-block (low deck) that won't be a problem
Now if I could only locate such a pulley!
BTW, both said if you can get the fan close enough to the radiator to NOT use a shroud
I'm certainly willing to try a faster WP speed since that is relatively easy to do (compared to a new radiator), although I'm a bit wary of 30 or 40% overdrive... Not worried about throwing the belt, but of cavitation in the pump.
Today I've been searching for a pair of single-groove pulleys with faster than 0.95 ratio, but haven't been able to find anything either aftermarket or "pre-owned". The new ones are all "performance ratio" which is the exact opposite of what I'm looking for...
My problem is getting the fan FAR enough from the radiator ;) I assume they're talking about mechanical fans, not electrical?
There might be room for the shortest fan clutch if I can find a solid fan that doesn't extend toward the core very far if at all. Otherwise I'd be stuck using a flex fan. For now I'd like to keep the Contour fans and see if I can make them work.
Up a few posts , u said u didnt have a cooling problem , then why are u messing with it ??!
Agreed, the fixed fan is the best cooler - but also consumes the most hp. I take it you are not a fan (pun intended) of flex fans?
Because I can never leave well enough alone
That’s not quite right. The hotter you can run an engine, the more power it will make, to a degree. Meaning if it gets too hot, bad things can/will happen.
Look at drag racing for a moment. Top Fuel, the longer they sit at the light, the more power they make due to the heat. That’s why, sometimes, they blow off the tires(smoke show). The game is played at the staging, ya hear about it all the time.
With aluminum pulleys you can only make the water pump pulley neck down to about 6.9" before it comes in contact with the bolts that hold the pump into the housing. With that being said, now you can only make the crank about 6.4" before it becomes too big and touches the water pump pulley. So the best ratio you're probably going to find is about 0.92:1. And we only do that combination with a two groove crank. Our single groove crank stuff is all underdriven because they are typically high horsepower race applications and aren't concerned with cooling or charging.
The Verdict: Hotter engines make more power. Sure, cooler air and fuel is denser, meaning more of it can fill combustion chambers to make more power, but once detonated, less energy (heat, in this case) being absorbed by engine material and coolant means more of it can be put toward forward motion.Nov 30, 2009
I asked CVF Racing about their aluminum pulleys and this is what they said:
I looked at the stamped steel pulleys on there now, and the two rims are just about touching. The outer groove is for PS pump which I don't have. So the (inner) crank pulley would have to get bigger at the same time the water pump pulley gets smaller... Not only that, the water pump pulley can't get very much smaller either before hitting the pump bolts on its
ID.
Now what?
View attachment 1715595199
I’ll measure my pulleys when I get home, but they are overdriven.
Did you ask about the serpentine pulleys? Seems I called about them and they had a better ratio.
Agreed, the fixed fan is the best cooler - but also consumes the most hp. I take it you are not a fan (pun intended) of flex fans?
Because I can never leave well enough alone
A pic of a working, big-block pulley setup would be great
I am not interested in putting all that serpentine stuff on my engine - nor spending the $ it would cost, thanks.
So my pulleys will be up for sale as I’m switching if that’s the only way to get the pump speed up.
CVF says their basic serpentine conversion is 0.92:1 underdrive. No good.
A 3-groove crank pulley (using the outer groove) and a 2-groove a/c WP pulley (using the inner groove) supposedly will line up. Alternator will need remounting. The problem is that the belt will be running very close to the Contour fan shroud since it'll be a lot further forward. So the faster water pump is not proving very practical in the limited A-body space.
I'm going to install a PWM controller and see if I can keep the temps cooler in the first place (no point in letting it get to 198 before the fans come on).
WTH?? They really said that? I actually called them and I wrote down the pulley diameters for the serpentine system. The crank is 6.4 inches and the water pump is 5.4 inches which is a skosh over 18% overdriven.
That one is going to be slightly underdriven but not by much. It runs about 0.92:1