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Old 03-06-2019, 02:39 PM   #1
revkev6
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Default dual V-belt crank pulley for 8ba

hey guys, I'm in the process of building a blower setup for my 8ba motor. it's running an eaton style blower. I need a little help with the drive though. I would rather not do a serpentine belt... original wide truck crank pulley is one belt. I would like to have a pulley that also has a belt between that stock location and the timing cover so that the entire system is no longer than a stock flathead. dual belt drive for the supercharger would be best.



trying to use a ford part instead of a custom pulley, could you use an early dual belt pulley off a late 30's 221?? if i remember correctly these have the belts running closer to the block. I would want the front sheave to line up with the waterpumps and the rear sheave to run up to the blower only. both belts would drive the supercharger.
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Old 03-06-2019, 03:24 PM   #2
JSeery
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Default Re: dual V-belt crank pulley for 8ba

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Originally Posted by revkev6 View Post
I would want the front sheave to line up with the waterpumps and the rear sheave to run up to the blower only. both belts would drive the supercharger.
What are you considering the difference between a blower and a supercharger?
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Old 03-06-2019, 03:25 PM   #3
revkev6
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Default Re: dual V-belt crank pulley for 8ba

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What are you considering the difference between a blower and a supercharger?

nothing


I was just stating the rear belt would ONLY drive the supercharger pulley, while the front belt would run the pumps and generator in addition to the supercharger
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Old 03-06-2019, 04:32 PM   #4
flatheadmurre
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Default Re: dual V-belt crank pulley for 8ba

The sheaves between early/late donīt line up...you canīt mix early pulley with late waterpumps.
And the early belt position will also hit the distributor on an 8ba.
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Old 03-06-2019, 04:44 PM   #5
revkev6
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Default Re: dual V-belt crank pulley for 8ba

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The sheaves between early/late donīt line up...you canīt mix early pulley with late waterpumps.
And the early belt position will also hit the distributor on an 8ba.

I am planning to run a late waterpump so the belt running out that far will clear the distributor. I guess I have to find a dual belt early crank pulley to see if the front belt can be made to align with the late waterpumps so that I end up with a rear belt in between that I can run directly up to the supercharger.



another question, on the late truck style pulleys that have two sheaves, are they the same diameter? it almost looks like the front one might be slightly smaller than the rear?? it may be possible for me to take one of these pulleys and trim the back to fit one belt width tighter to the block and put a spacer in front.
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Old 03-06-2019, 05:02 PM   #6
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Default Re: dual V-belt crank pulley for 8ba

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You may well be able to use the double pulley, I use one when fitting a 4in crank into a 99a block in a 33, I cut the outside pulley of in the lathe.
but you may have trouble driving the blower with just one vee belt.
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Old 03-06-2019, 11:00 PM   #7
flatheadmurre
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Default Re: dual V-belt crank pulley for 8ba

The 8RT pulleys are different diameter between outer/inner shieve.
Can work if you make the pulley on the blower with same difference between shieves.
There are industrial solid dualshieve pulleys for 49-53 around.
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Old 03-06-2019, 11:06 PM   #8
34fivewindow
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Default Re: dual V-belt crank pulley for 8ba

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Originally Posted by revkev6 View Post
hey guys, I'm in the process of building a blower setup for my 8ba motor. it's running an eaton style blower. I need a little help with the drive though. I would rather not do a serpentine belt... original wide truck crank pulley is one belt. I would like to have a pulley that also has a belt between that stock location and the timing cover so that the entire system is no longer than a stock flathead. dual belt drive for the supercharger would be best.



trying to use a ford part instead of a custom pulley, could you use an early dual belt pulley off a late 30's 221?? if i remember correctly these have the belts running closer to the block. I would want the front sheave to line up with the waterpumps and the rear sheave to run up to the blower only. both belts would drive the supercharger.

Look at the crank pulley, on the French flat head, its what your looking for, and will work on the 8BA.
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Old 03-07-2019, 10:30 AM   #9
revkev6
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Default Re: dual V-belt crank pulley for 8ba

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Originally Posted by flatheadmurre View Post
The 8RT pulleys are different diameter between outer/inner shieve.
Can work if you make the pulley on the blower with same difference between shieves.
There are industrial solid dualshieve pulleys for 49-53 around.

that's not what I wanted to hear lol. I know I could get a custom upper pulley made. trying to limit the amount of custom machine work. If I had a lathe in my house still this would be a moot point.


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Originally Posted by 34fivewindow View Post
Look at the crank pulley, on the French flat head, its what your looking for, and will work on the 8BA.

looks like the french flathead has different diameters as well. seems as though I'm going to phone a friend who runs the machine shop at a local university. I will buy a small upper pulley off amazon and have him bore that for a press fit and make an aluminum lower pulley to spec. this will give me stock water pump pulleys and the ability to change ratio by getting off the shelf upper pulley with minimal modifications.
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Old 03-08-2019, 01:55 PM   #10
solidaxle
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Default Re: dual V-belt crank pulley for 8ba

I'll refer you to Joe Abbin's book "Blown Flathead".


Things to consider.


-Determine both pulley diameters (overdrive) by the desired boost and motor displacement. The Formula is in Joe's book.


-Minimum of two belts driving the blower.


- Enough wrap is need around the blower pulley or it will slip. Water pumps don't need much wrap to work properly.


- You need a way to adjust the belts.


- alignment is critical for belt life.
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Old 03-08-2019, 01:59 PM   #11
revkev6
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Default Re: dual V-belt crank pulley for 8ba

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Originally Posted by solidaxle View Post
I'll refer you to Joe Abbin's book "Blown Flathead".


Things to consider.


-Determine both pulley diameters (overdrive) by the desired boost and motor displacement. The Formula is in Joe's book.


-Minimum of two belts driving the blower.


- Enough wrap is need around the blower pulley or it will slip. Water pumps don't need much wrap to work properly.


- You need a way to adjust the belts.


- alignment is critical for belt life.

yes to all of these. I have joe's book and have spoken with him. just trying to find the way to match all of these criteria that requires the least custom machine work, especially since I plan to start with a fairly stock motor then build a big motor with big cam.
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Old 03-11-2019, 09:14 AM   #12
solidaxle
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Default Re: dual V-belt crank pulley for 8ba

Sounds like you're on the right track. There was one stock 8ba flathead crank pulley, see picture but the diameters are different. You would need to have the belts run different not parallel. One to go around crank, blower then one water pump. The other belt in the same order just the other pump.
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Old 03-11-2019, 09:20 AM   #13
solidaxle
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Default Re: dual V-belt crank pulley for 8ba

Here's another idea.This would be a custom crank pulley, not the one above.


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Last edited by solidaxle; 03-11-2019 at 09:36 AM.
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