boost experiment
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Postmaster
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From: shepherd
boost experiment
i want to try to rig up a 200 mph leaf blower to the induction on my 85 6.9 and put a pressure gauge on the filter housing to read. i am curious to see how many psi it will make. i know this is a controversal topic, but 200 mph wind has to do something in the way of boost. anybody have any ideas. i have seen a pic online of a mustang with a leafblower under the hood. it looks pretty funny.
Post Fiend
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From: Nutter Fort, WV
As an experiment, block the end of the leaf blower tube off and rig a pressure gauge to read tube pressure.
My guess is you will build very little pressure or none at all.
Figuring cubic inches and the displacement of a 6.9, if you ran the engine at 3300 RPM and tried to suck all the air through a 1" x 3" slot like you have at the end of a leaf blower tube, I figure 218.75 MPH for the air velocity at the slot.
To build 7 PSI you would have to have an air velocity over 328.125 MPH through a 1" x 3" hole at 3300 RPM.
A large ram air will probably build more pressure and be much easier and cheaper to construct.
My guess is you will build very little pressure or none at all.
Figuring cubic inches and the displacement of a 6.9, if you ran the engine at 3300 RPM and tried to suck all the air through a 1" x 3" slot like you have at the end of a leaf blower tube, I figure 218.75 MPH for the air velocity at the slot.
To build 7 PSI you would have to have an air velocity over 328.125 MPH through a 1" x 3" hole at 3300 RPM.
A large ram air will probably build more pressure and be much easier and cheaper to construct.
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You know, if you had a V8... I wonder how it would work if you made 4 cylinders into air compressors that fed the other 4 cylinders.... I mean if you could get the timing right to where it would run.. I wonder if it would do any good..
Tuned
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From: Beaumont Tx
That has been done for decades but for a different reason. We used to take old V-8s and convert them into four-cylinder gas engines with four-cylinders being used as an air-compressor. There is also a kit to convert a VW flat four into a two cylinder engine with two cylinders working as an air-compressor. Never thought of having the air driven into the engine. I think for the amount of drag you would have it wouldn't be enough of an improvement.
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From: shepherd
what if i was able to get my hands on a turbo, take the exhaust side off and weld a pulley to it. would the belts spin it fast enough to make any boost. what kind of pulley would i need in size.
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Originally Posted by f100guy
what if i was able to get my hands on a turbo, take the exhaust side off and weld a pulley to it. would the belts spin it fast enough to make any boost. what kind of pulley would i need in size.
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From: shepherd
i know about those but i am wanting to do a homemade thing. there is a turbo at the shop from a 466 international. i was thinking of putting it under the truck how much lag would i expect. the truck has a granny 4 spd tranny.
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Exhaust driven turbos turn up to 100,000 RPM or more, so the pulley idea is an impossibility. You'd need a much larger unit with a different shaped impeller to work, and more likely than not, some kind of planetary gear drive to rotate the unit at the speeds necessary to generate induction pressure.
Your reinventing the wheel, but have fun!
Your reinventing the wheel, but have fun!
Post Fiend
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From: Nutter Fort, WV
Given the speeds the impellers turn, balance, material strength, tolerances, heat build up and a host of other things need to be worked out.
Not something that most people have the equipment or knowledge to produce, even more so in their garage for a limited budget.
If a turbo impeller turning 100,000 RPM exploded, we are talking serious personal injury or death as a very real possibility in the event of a failure.
Fragmentation grenade....turbo impeller failure at high RPM.
The results of both are the same.
Small pieces of metal traveling at very high speeds in all directions.
Remember, you only have a layer of thin sheet metal and a couple layers of plastic between the passenger compartment and the engine compartment.
Not something that most people have the equipment or knowledge to produce, even more so in their garage for a limited budget.
If a turbo impeller turning 100,000 RPM exploded, we are talking serious personal injury or death as a very real possibility in the event of a failure.
Fragmentation grenade....turbo impeller failure at high RPM.
The results of both are the same.
Small pieces of metal traveling at very high speeds in all directions.
Remember, you only have a layer of thin sheet metal and a couple layers of plastic between the passenger compartment and the engine compartment.
