Need Advice On Blower Pullies & Belt Size
#1
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Need Advice On Blower Pullies & Belt Size
509ci
AFR 315 full cnc , inconel exhaust valves and roller spring package .
8.4 cr
Diamond flat top blower pistons .
Callies Ultra H-Beam 6.385 rods .
4" stroke forged crank .
Bore 4.50
Standard deck 9.8
I have no cam specs yet .
Spinning to 6000 rpm .
Should make around 625 to 650 n/a
871 BDS blower no chiller .
Two 850 quick fuels .
BDS competition blower intake .
CMI Sport tube dry exhaust .
Looking to make 850+ hp 91 octain fuel .
Many call's to BDS to no avail . Need to know what size blower pulley's and belt to reach my goal . Any help from my brothers would be greatly appreciated . Looking to use 8mm stuff .
AFR 315 full cnc , inconel exhaust valves and roller spring package .
8.4 cr
Diamond flat top blower pistons .
Callies Ultra H-Beam 6.385 rods .
4" stroke forged crank .
Bore 4.50
Standard deck 9.8
I have no cam specs yet .
Spinning to 6000 rpm .
Should make around 625 to 650 n/a
871 BDS blower no chiller .
Two 850 quick fuels .
BDS competition blower intake .
CMI Sport tube dry exhaust .
Looking to make 850+ hp 91 octain fuel .
Many call's to BDS to no avail . Need to know what size blower pulley's and belt to reach my goal . Any help from my brothers would be greatly appreciated . Looking to use 8mm stuff .
Last edited by the deep; 08-08-2015 at 08:15 PM.
#2
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Not too sure exactly what your question is. Are you asking how much boost you need to get the extra 200 hp you are looking for. Of all the info you have listed one critical thing you have not stated is static compression ratio. The BDS catalog will give you "general compression ratios" based on the static compression ratio and the boost you are running. Probably the safest place to start I would think is same pulley top and bottom. The BDS catalog will tell you what size belt is needed for a total "X" number of teeth. I guess just make your choice of pulley teeth where you are safe initially, but still have room to run a smaller pulley on top for a bit of overdrive if need be to get to your desired horsepower. I hope this helps!
#5
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Not too sure exactly what your question is. Are you asking how much boost you need to get the extra 200 hp you are looking for. Of all the info you have listed one critical thing you have not stated is static compression ratio. The BDS catalog will give you "general compression ratios" based on the static compression ratio and the boost you are running. Probably the safest place to start I would think is same pulley top and bottom. The BDS catalog will tell you what size belt is needed for a total "X" number of teeth. I guess just make your choice of pulley teeth where you are safe initially, but still have room to run a smaller pulley on top for a bit of overdrive if need be to get to your desired horsepower. I hope this helps!
#6
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Well if this makes 625 NA than 1/2 of atmoshere is Appox 7 lbs. so take 1/2 of 625 (312) and add 625 + 312= 937 at 7 LBS. you dont need much boost it looks like to get your goal.
Those heads flow real good, looks like 380 int and 296 ex @ .600 lift.
Correct me if im wrong but that is what BDS has told me in the past.
Those heads flow real good, looks like 380 int and 296 ex @ .600 lift.
Correct me if im wrong but that is what BDS has told me in the past.
#7
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^^^^Need to consider parasitic loss. It takes HP to drive the blower, air temps , etc.
5 under would be a good starting point. If going to be dynoing id bring some extra pulleys if u can borrow some. I wouldnt be afraid to run 7lbs on that setup. Call the guys are good vibes racing for belt and pulley setup
850hp sounds like a reasonable goal.
5 under would be a good starting point. If going to be dynoing id bring some extra pulleys if u can borrow some. I wouldnt be afraid to run 7lbs on that setup. Call the guys are good vibes racing for belt and pulley setup
850hp sounds like a reasonable goal.
#8
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^^^^Need to consider parasitic loss. It takes HP to drive the blower, air temps , etc.
5 under would be a good starting point. If going to be dynoing id bring some extra pulleys if u can borrow some. I wouldnt be afraid to run 7lbs on that setup. Call the guys are good vibes racing for belt and pulley setup
850hp sounds like a reasonable goal.
5 under would be a good starting point. If going to be dynoing id bring some extra pulleys if u can borrow some. I wouldnt be afraid to run 7lbs on that setup. Call the guys are good vibes racing for belt and pulley setup
850hp sounds like a reasonable goal.
Here you go, http://www.goodvibesracing.com/
This is what they do as MT mentioned.
#9
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Here you go, http://www.goodvibesracing.com/
This is what they do as MT mentioned.
This is what they do as MT mentioned.
#10
Charter Member # 55
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Here is a good tech article from Holley with a lot of reference charts of what to expect with various blower sizes and Comp ratios.
http://documents.holley.com/techlibr..._tech_info.pdf
http://documents.holley.com/techlibr..._tech_info.pdf