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So after googling for 2 hrs I am still at a stand still. So much information over so many decades. I am unsure of Crank Pulley Diameter for any B series,besides B20 is the largest. Trying to do my Wife's Vortech build and would love to buy a NEW OEM pulley,but we all know dwindling Honda Stock. I have been considering ATI/Fluid Damper, Need Real Life Measurements or maybe and old spread sheet someone may have around to calculate boost. Running a 3.12 4 rib blower pulley. Just need Crank pulley diameters. Any help is Greatly Appreciated. Maybe JIM will chime in and educate me a little bit.
I do not have a "List" per se', but I certainly have a bunch of "B" series crank pulleys laying around. I would be happy to offer suggestions based on what your specific needs are. What is the kit originally for ? I suspect that knowing that will give you a really good start since no supercharger kit ever created used something besides the stock crank pulley for the "Off-The-Shelf" kit. It is when you want to increase the boost... or you have alternative parts being used, that crank pulley changes may be helpful.
Somewhat related but for the OP - if you do decide to get an ATI pulley (super street), be aware there may be a backorder on them. I placed an order for one a few months ago, they said it would take a couple months to get in as they were backed up on orders and out of stock.
Somehow it ended up coming in only a week or so later, but just something to maybe keep in mind. Not sure what their current inventory looks like.
I do not have a "List" per se', but I certainly have a bunch of "B" series crank pulleys laying around. I would be happy to offer suggestions based on what your specific needs are. What is the kit originally for ? I suspect that knowing that will give you a really good start since no supercharger kit ever created used something besides the stock crank pulley for the "Off-The-Shelf" kit. It is when you want to increase the boost... or you have alternative parts being used, that crank pulley changes may be helpful.
Old School Vortech 99-00 EM1 kit. Going on GSR. Using a 4 rib 3.12" Jack shaft pulley. From what I have Gathered the GSR pulley is right around 6" where the b20 pulley is like 6.2" Was looking for around 10-11 psi. Since any used crank pulley has the rubber starting to give way etc. I wanted to just go ahead and order a New ATI/Fluid damper and be done with it. B20 Pulley's are still available from Honda for the moment. From searching GSR Crank and 3.12 on the Vortech should net me 10-11 psi, 3.12 and B20 pulley should net at 15psi. Without a solid dimension on crank pulley all I can compare is 5.67" on ATI and 5 7/8's on Fluid Damper. I wouldn't want to go smaller on Crank with the same 3.12" since I wont be even close to target boost. Must retain all accessories.
Somewhat related but for the OP - if you do decide to get an ATI pulley (super street), be aware there may be a backorder on them. I placed an order for one a few months ago, they said it would take a couple months to get in as they were backed up on orders and out of stock.
Somehow it ended up coming in only a week or so later, but just something to maybe keep in mind. Not sure what their current inventory looks like.
Saw the ATI was back ordered earlier today while searching. Thanks for the heads up
The A/C groove on a GSR crank pulley has a diameter of 139mm (5.47"). This produces a drive ratio of 1.75, so what maximum engine RPM do you plan to rev to ?
The A/C groove on a GSR crank pulley has a diameter of 139mm (5.47"). This produces a drive ratio of 1.75, so what maximum engine RPM do you plan to rev to ?
Since engine is internally stock and running an ITR Intake cam. 8200 max.
Maybe I should ask ATI/Fluid Damper what there AC groove Diameter is? They only give above stated Dimensions. 5.67" and 5 7/8's. I am ASSuming that is overall at Alternator Groove.
Maybe I should ask ATI/Fluid Damper what there AC groove Diameter is? They only give above stated Dimensions. 5.67" and 5 7/8's. I am ASSuming that is overall at Alternator Groove.
Actually looks like Alt/AC Are not stepped on ATI
Shell Material: 5.67" Aluminum, two 4-rib drives
While Fluidamper doesn't state and pictures make it hard to tell if it is stepped (EDIT) Found a better picture. Not stepped. 2 4 rib at same diameter.
The ATI at 5.67" would be close... slightly larger in diameter would make more boost than a stock GSR crank pulley. You must be careful not to over-spin the supercharger, so I would verify with Vortech what the maximum blower shaft speed is and make sure you stay under that. This is calculated by dividing the crank pulley diameter by the supercharger pulley diameter and then multiplying that product by your maximum engine RPM. If this value is greater than the supercharger redline, you will either have to decrease crank pulley diameter, increase supercharger pulley diameter, or reduce engine redline.
The ATI at 5.67" would be close... slightly larger in diameter would make more boost than a stock GSR crank pulley. You must be careful not to over-spin the supercharger, so I would verify with Vortech what the maximum blower shaft speed is and make sure you stay under that. This is calculated by dividing the crank pulley diameter by the supercharger pulley diameter and then multiplying that product by your maximum engine RPM. If this value is greater than the supercharger redline, you will either have to decrease crank pulley diameter, increase supercharger pulley diameter, or reduce engine redline.
Careful... you must multiply the blower pulley speed of 14,901 RPM by the internal "drive ratio" of the V-5-G Supercharger. With a quick search, I cannot find what that "drive ratio" is exactly, however, this link does a calculation in the background and using the 5.67" crank pulley diameter and the 3.12" supercharger pulley with a maximum engine speed of 8200 RPM equates to a supercharger shaft speed of 51,412 RPM... VERY close to redline for the supercharger. It would also "suggest" a drive ratio multiplier of 3.45:1
Careful... you must multiply the blower pulley speed of 14,901 RPM by the internal "drive ratio" of the V-5-G Supercharger. With a quick search, I cannot find what that "drive ratio" is exactly, however, this link does a calculation in the background and using the 5.67" crank pulley diameter and the 3.12" supercharger pulley with a maximum engine speed of 8200 RPM equates to a supercharger shaft speed of 51,412 RPM... VERY close to redline for the supercharger. It would also "suggest" a drive ratio multiplier of 3.45:1
my particular setup came with a custom 8 rib crank no acc. Crank pulley and 8 rib 3.12. Thinking owner before pushed this sucker a whole lot harder than I ever will..LOL. Why I spent 1300 to have it rebuilt.
Forgot my Cloth tape and Digital Caliper battery was dead..LOL If I knew you were going to make me Work for that ISH.. I would have been prepared.. LOL. Also I was wrong. 8 rib Crank/Blower and Alt Acc.. First 2 are Jack Shaft 8 rib 3.12 rest are Crank
WILL NOT be running either of those. I Bought new 4 rib 3.12,idler,and looking at ATI Crank pulley. Looking for 300/310 ish. I tried building (For Me) Ramey built 1k Hp Block and looking for a spare GSR head,but caught myself and was like 3-325 sounds like a good start..lol
WILL NOT be running either of those. I Bought new 4 rib 3.12,idler,and looking at ATI Crank pulley. Looking for 300/310 ish. I tried building (For Me) Ramey built 1k Hp Block and looking for a spare GSR head,but caught myself and was like 3-325 sounds like a good start..lol
Before you purchase the ATI crank pulley, reach out to Vortech and verify the internal supercharger drive ratio and maximum shaft/impeller speed. Then we can alter either the crank pulley diameter OR the supercharger/jackshaft pulley to properly get your blower speed to your established target.
Before you purchase the ATI crank pulley, reach out to Vortech and verify the internal supercharger drive ratio and maximum shaft/impeller speed. Then we can alter either the crank pulley diameter OR the supercharger/jackshaft pulley to properly get your blower speed to your established target.
Called Vortech today. Max impeller 65,000. Internal drive 3.61. We can use their calculator for V2-V3 with jack shaft as it already has it.
Which I could be wrong since jack Shaft technically is only 1 tooth (Keyway) and that brings blower speed back to the 14,901 I previously posted based off the math.
Definitive B series CRANK PULLEY DIAMETERS
