• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

383 pulley question

Alan Fiandaca

Well-Known Member
Local time
11:06 AM
Joined
Apr 9, 2019
Messages
48
Reaction score
63
Location
Tucson, AZ
I have a non optioned 1969 Road Runner ( manual steering and brakes, no A/C ). I recently installed a factory style clutch fan hoping to aid with the Arizona summer heat. It didn't help a whole lot and that got me thinking about pulley sizes so I search my assembly manual and it looks like different diameter pulleys for the clutch fan set up. I can't seem to locate any single groove pulleys for the clutch fan set up though, and I'm thinking only two groove pulleys came with the clutch fan. Anyone familiar with this issue ?

Alan
 
With manual steering and no a/c It should be a single belt for the alternator, water pump and crankshaft.
 
A/C cars had a little pulley on the water pump, made it spin faster. Doesn’t really work without A/C though. Used a different groove.
 
I have a non optioned 1969 Road Runner ( manual steering and brakes, no A/C ). I recently installed a factory style clutch fan hoping to aid with the Arizona summer heat. It didn't help a whole lot and that got me thinking about pulley sizes so I search my assembly manual and it looks like different diameter pulleys for the clutch fan set up. I can't seem to locate any single groove pulleys for the clutch fan set up though, and I'm thinking only two groove pulleys came with the clutch fan. Anyone familiar with this issue ?

Alan
See my previous write up below, also in General tech discussions re Hemi water pump pulley...

The correct hemi water pump drive sheave (drive pulley) is part # 2946716 This can be used on B / RB engines WITHOUT air conditioning, using the original crankshaft sheave. This sheave is approximately 6 1/4" diameter and will require a SLIGHTLY shorter drive belt (approximately 2" shorter) and will result in the water pump turning faster by 200+ RPMs at any given eengine RPM, resulting in more gallons per minute of coolant circulated at a higher velocity. I use this sheave along with the # 2806070 torque drive fan clutch and a 7 blade fan for improved cooling system performance. Works well.... also consider a Flowkooler pump
BOB RENTON
 
Thank you Bob, that's the part number I came up with from the assembly manual, but is it a one or two groove pulley? Anyone know where to locate one ? Repo? A Google search didn't produce many results .I do have the Moroso " High Flow" water pump already. It's mainly low speed driving in 100+ degree temps that make me nervous.

Alan
 
Is the pulley alignment correct with the six cylinder pulley. Sounds like an interesting idea. Do you remember the diameter by any chance?
 
This is a 440 with A/C but the power steering pump is not in place.

Mock up 1A.jpg

Mock up 7.jpg
 
This is with the pump in place.

AC 6.jpg
 
Non A/C with no power steering may have had a 2 groove crank pulley IF a single groove was not available at the time the engine was assembled. I have read that it was common for cars to have upgraded parts if the standard parts were not available at time of assembly. This kept the assembly line moving.
 
They didn’t use any 2 groove water pump pulleys for a clutch fan in a 69 roadrunner. Either I’m confused on what is being asked or missed something?
 
OK, I guess I wasn't clear what I'm looking for. I have single groove pulleys because of no AC or p/steering, but I swapped out my fixed blade fan for a clutch fan set up. I now know that the factory clutch fan assembly took a smaller diameter water pump pulley to spin the pump faster which I feel would help me. Just trying to find a single groove pulley of the smaller diameter pulley of the factory clutch fan set up.

Alan
 
Thank you Bob, that's the part number I came up with from the assembly manual, but is it a one or two groove pulley? Anyone know where to locate one ? Repo? A Google search didn't produce many results .I do have the Moroso " High Flow" water pump already. It's mainly low speed driving in 100+ degree temps that make me nervous.

Alan
The Hemi sheave is very difficult to find. There a few reproductions available....Y1, Mancini Racing, maybe Kramer Automotive, maybe Tony's Parts....also very expensive....approximately $ 150.00. As the Hemi came without A/C, sometimes P/S, the single groove crankshaft sheave will align with the alternator sheave. The aftermarket water pump specs are very mysterious and difficult to obtain....gallons/minute flow rate at various RPMs to get the highest velocity thru the block and radiator. Contrary to the popular opinion that slow circulation is best, high velocity and high flow rates (gallons/minute) and a 180° thermostat are the secret to good heat transfer characteristics, as well as good air flow thru the radiator at lower vehicle speeds, using a TORQUE dtive clutch and a 7 blade fan with shroud. I'm sure others will disagree, but having studied and designed heat exchangers, thermodynamics is an exact science that, when applied, will prove the principles involved. Remember if the coolant temps rise above 200°F, the world will not come to an end. My RS23V0A GTX, on 95° + days runs at 195° - 205° coolant temps just fine. Just my opinion of course.
BOB RENTON
 
I see what you are trying to accomplish now. As mentioned the hemi pulley would be an option. Also there are aluminum aftermarket over/under drive pulley sets as well. What exactly is the cooling problem you are experiencing?
 
Most of the year my RR runs nice and cool, but here in Tucson AZ we can see upwards of 108 degrees from June to October .I have a mile long road between my house and the main road that is closer to the lunar surface than real road. On 100+ degree days after a cruise, the trip from the REAL road to my house sees the temps climb. With a laser temp gun my radiator top shows about 220 degrees. Not terrible, but if a smaller pulley is available, I would certainly use it.

Alan
 
My two cents worth is that if your cooling system is on the hairy edge chances are that your radiator is the underlying condition. The radiator probably needs to be re-cored/ restored/ upgraded. you can try replacing pulleys etc. but if the radiator core efficiency has degraded over the years (they all do) it needs the attention, different pulleys, water pumps etc are just a temporary band-aid.
 
Most of the year my RR runs nice and cool, but here in Tucson AZ we can see upwards of 108 degrees from June to October .I have a mile long road between my house and the main road that is closer to the lunar surface than real road. On 100+ degree days after a cruise, the trip from the REAL road to my house sees the temps climb. With a laser temp gun my radiator top shows about 220 degrees. Not terrible, but if a smaller pulley is available, I would certainly use it.

Alan

Are you using a fan shroud? What is the actual water temp showing? The 383/440 cars used the same water pump pulley regardless of if it had a thermal fan or direct drive, ac pulley is a completely different setup as shown above.
 
I have a 22" radiator which has just been recored with a 3 row high efficiency core, factory fan shroud, high flow 160 degree thermostat. On a nice cool 85 degree day the factory gauge will run about 1/3 and my laser says approx 170 degrees @ radiator top.
As for the same pulleys being used on the 383/440, as I read in my assembly manual, that when equipped with "High Capacity & Torq. Drv" see page 100 which shows the Hemi with a clutch fan and smaller pulley.
I assumed Torq Drv. meant clutch fan, am I wrong ?

Alan
 
I have a 22" radiator which has just been recored with a 3 row high efficiency core, factory fan shroud, high flow 160 degree thermostat. On a nice cool 85 degree day the factory gauge will run about 1/3 and my laser says approx 170 degrees @ radiator top.
As for the same pulleys being used on the 383/440, as I read in my assembly manual, that when equipped with "High Capacity & Torq. Drv" see page 100 which shows the Hemi with a clutch fan and smaller pulley.
I assumed Torq Drv. meant clutch fan, am I wrong ?

Alan
Torque drive is same as clutch fan. The hemi did use a smaller pulley for the water pump. It also used a different crank pulley.
 
Auto Transport Service
Back
Top