Blower or not??
11-15-2007, 01:31 PM
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Blower or not??
I have a 10 meter fountain with #3 drives. It has fresh 540 aluminum head motors built for blowers, but they dont have blowers on them. Runs about 85 MPH. The compression is only around 8 to 1. How much power can I gain by raising the compression up to around 10 to 1? and can I still run pump gas? Or should I just install blowers???? I want reliability. What would u recommend for a blower for a motor of this size? I have willys 950 CFM carb on the motor now and would like to use them on the blowers if possible. Any imput would be appreciated.
11-15-2007, 02:54 PM
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You are losing a TON of power. Add the blowers it would be the best option and far outweigh the gains of higher compression. You are right where you want to be as far as compression for the blowers. You will get hundreds of horsepower and you can run 8 to ten pds boost on pump gas with that set up. Keep your timing coservative with the blowers and they will live a long time. 30 Deg max. Ideally you should run dual 750-850's for best fuel distribution. An 8-71 will be perfect and a 10-71 would be better if it would fit. You can spin the 10 slower and create less heat.
Last edited by ghittner; 11-15-2007 at 02:57 PM.
11-19-2007, 09:04 AM
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I have a 10 meter fountain with #3 drives. It has fresh 540 aluminum head motors built for blowers, but they dont have blowers on them. Runs about 85 MPH. The compression is only around 8 to 1. How much power can I gain by raising the compression up to around 10 to 1? and can I still run pump gas? Or should I just install blowers???? I want reliability. What would u recommend for a blower for a motor of this size? I have willys 950 CFM carb on the motor now and would like to use them on the blowers if possible. Any imput would be appreciated.
I have a set of low hr Blower Shop 8-71s if you need them,all they need is snout's ,I used the 8-71 snouts on my new Hi helix 14-71s.
11-19-2007, 11:56 AM
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You are losing a TON of power. Add the blowers it would be the best option and far outweigh the gains of higher compression. You are right where you want to be as far as compression for the blowers. You will get hundreds of horsepower and you can run 8 to ten pds boost on pump gas with that set up. Keep your timing coservative with the blowers and they will live a long time. 30 Deg max. Ideally you should run dual 750-850's for best fuel distribution. An 8-71 will be perfect and a 10-71 would be better if it would fit. You can spin the 10 slower and create less heat.
11-26-2007, 05:53 AM
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11-26-2007, 04:47 PM
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Increasing compression from 8:1 to 10:1 will give you about 6.5% more power all other things being equal according to this article - The Power Squeeze
11-28-2007, 10:45 AM
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