Title: How many revolutions of an engine
Post by: Grant Monkhouse on November 19, 2020, 05:46:45 PM
Post by: Grant Monkhouse on November 19, 2020, 05:46:45 PM
Something that Carl asked me the other day..
How many revolutions does an engine do down the drag strip?
Let's see who can work it out.
Use some easy numbers though.
Average rpms down the 1/4 mile = 6000rpms.
Quarter mile time = 10 seconds
What's your answer?
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How many revolutions does an engine do down the drag strip?
Let's see who can work it out.
Use some easy numbers though.
Average rpms down the 1/4 mile = 6000rpms.
Quarter mile time = 10 seconds
What's your answer?
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Title: Re: How many revolutions of an engine
Post by: Grant Monkhouse on November 19, 2020, 05:55:33 PM
Post by: Grant Monkhouse on November 19, 2020, 05:55:33 PM
Now if you do an average of 6000 rpm in a 20minute race how many time does the engine rotate?
Now with those 2 figures can you work out in each scenario how many times the rotors do a full rotation in a 13B/20B/26B
The rotors don't do the same amount of rotations of the cranks shaft by the way.. Lol
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Now with those 2 figures can you work out in each scenario how many times the rotors do a full rotation in a 13B/20B/26B
The rotors don't do the same amount of rotations of the cranks shaft by the way.. Lol
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Title: Re: How many revolutions of an engine
Post by: Mr Spiller on November 19, 2020, 05:56:02 PM
Post by: Mr Spiller on November 19, 2020, 05:56:02 PM
Quote from: Grant Monkhouse on November 19, 2020, 05:55:33 PMCan I use a lifeline
Now if you do an average of 6000 rpm in a 20minute race how many time does the engine rotate?
Now with those 2 figures can you work out in each scenario how many times the rotors do a full rotation in a 13B/20B/26B
The rotors don't do the same amount of rotations of the cranks shaft by the way.. Lol
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Title: Re: How many revolutions of an engine
Post by: Grant Monkhouse on November 19, 2020, 06:07:46 PM
Post by: Grant Monkhouse on November 19, 2020, 06:07:46 PM
Yes
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Title: Re: How many revolutions of an engine
Post by: Mr Spiller on November 19, 2020, 06:27:10 PM
Post by: Mr Spiller on November 19, 2020, 06:27:10 PM
Quote from: Grant Monkhouse on November 19, 2020, 06:07:46 PM
Yes
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stumped I just 3 per rpm
Clearly not that easy
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Title: Re: How many revolutions of an engine
Post by: Jamie R on November 19, 2020, 06:58:32 PM
Post by: Jamie R on November 19, 2020, 06:58:32 PM
Quote from: Grant Monkhouse on November 19, 2020, 05:46:45 PM1000 revolutions
Something that Carl asked me the other day..
How many revolutions does an engine do down the drag strip?
Let's see who can work it out.
Use some easy numbers though.
Average rpms down the 1/4 mile = 6000rpms.
Quarter mile time = 10 seconds
What's your answer?
Sent from my VOG-L09 using Tapatalk
Sent from my iPhone using Tapatalk
Title: Re: How many revolutions of an engine
Post by: Grant Monkhouse on November 19, 2020, 06:59:14 PM
Post by: Grant Monkhouse on November 19, 2020, 06:59:14 PM
6000 rpm = 100 rps(revolutions per second)
100 rps x 10 second 1/4mile pass
=1000 revolutions of the engine down the drag strip.
Obviously there's the burnout and drive back to the pits but just making it easy
Now in a 20 minute race.
6000rpm (revolutions per minute) x 20
= 120,000 revolutions per 20 minute race
Now the eshaft/Crank does 3 revolutions for one full rotation of a rotor
So in the drag race you take 1000 revolutions and divide that by 3
1000 / 3 = 333.333 ful rotations of one rotor
So a 2 rotor is 333.333 x 2 =666.666 full rotations
For a 20B x3 for a 26B x4
So in a 20 min race
120,000 / 3 = 40,000 full rotations of one rotor
Then multiply that number by how many rotors etc
IT is very interesting as (like myself) everyone thinks that a drag engine is a good testament to a solid built engine.
As the saying goes drag racing outs the most amount of stress on an engine in the shortest amount of time...
However if you look at a circuit car, Clives car as a perfect example, just how much abuse it has done.
5 years with the same engine.
6 race events per year?
Qualifying sessions
20 minute races
At 500hp
That just shows how good the engine is and also how well tuned the car is
testament to the guy that built the engine and also to guy that mapped it, and also nit forgetting the Driver Clive 
Now there's a huge amount if variable to consider etc, traction being a major one especially in drag racing because traction puts huge loads onto a drag engine, acceleration a car from 0-60 in 2 seconds at a guess which is a lot different to a track car.
Just looking at the numbers you have got to appreciate how good an engine has to be for drag racing but also on track.
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100 rps x 10 second 1/4mile pass
=1000 revolutions of the engine down the drag strip.
Obviously there's the burnout and drive back to the pits but just making it easy
Now in a 20 minute race.
6000rpm (revolutions per minute) x 20
= 120,000 revolutions per 20 minute race
Now the eshaft/Crank does 3 revolutions for one full rotation of a rotor
So in the drag race you take 1000 revolutions and divide that by 3
1000 / 3 = 333.333 ful rotations of one rotor
So a 2 rotor is 333.333 x 2 =666.666 full rotations
For a 20B x3 for a 26B x4
So in a 20 min race
120,000 / 3 = 40,000 full rotations of one rotor
Then multiply that number by how many rotors etc
IT is very interesting as (like myself) everyone thinks that a drag engine is a good testament to a solid built engine.
As the saying goes drag racing outs the most amount of stress on an engine in the shortest amount of time...
However if you look at a circuit car, Clives car as a perfect example, just how much abuse it has done.
5 years with the same engine.
6 race events per year?
Qualifying sessions
20 minute races
At 500hp
That just shows how good the engine is and also how well tuned the car is
testament to the guy that built the engine and also to guy that mapped it, and also nit forgetting the Driver Clive Now there's a huge amount if variable to consider etc, traction being a major one especially in drag racing because traction puts huge loads onto a drag engine, acceleration a car from 0-60 in 2 seconds at a guess which is a lot different to a track car.
Just looking at the numbers you have got to appreciate how good an engine has to be for drag racing but also on track.
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Title: Re: How many revolutions of an engine
Post by: Jamie R on November 19, 2020, 07:04:35 PM
Post by: Jamie R on November 19, 2020, 07:04:35 PM
Quote from: Grant Monkhouse on November 19, 2020, 05:55:33 PM120,000 revolutions
Now if you do an average of 6000 rpm in a 20minute race how many time does the engine rotate?
Now with those 2 figures can you work out in each scenario how many times the rotors do a full rotation in a 13B/20B/26B
The rotors don't do the same amount of rotations of the cranks shaft by the way.. Lol
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Each rotor 40000 times for 13b 20b and 26b
Doesn't matter how many rotors each rotor does one full orbit for 3 revolutions of the eccentric shaft
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Title: Re: How many revolutions of an engine
Post by: boosted on November 19, 2020, 08:49:18 PM
Post by: boosted on November 19, 2020, 08:49:18 PM
How many sparks per second on 1 rotor at 9000rpm
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Title: Re: How many revolutions of an engine
Post by: Jamie R on November 19, 2020, 09:06:24 PM
Post by: Jamie R on November 19, 2020, 09:06:24 PM
If there are 12 faces to a dodecahedron, how my any oranges are required to clean windows ??
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Title: Re: How many revolutions of an engine
Post by: jinx on November 19, 2020, 09:55:06 PM
Post by: jinx on November 19, 2020, 09:55:06 PM
If you don't know the answer is always 42...you are just too young.
Title: Re: How many revolutions of an engine
Post by: Grant Monkhouse on November 19, 2020, 10:33:02 PM
Post by: Grant Monkhouse on November 19, 2020, 10:33:02 PM
Quote from: boosted on November 19, 2020, 08:49:18 PM300, however there's no gaurentee that the spark plug just fires once
How many sparks per second on 1 rotor at 9000rpm
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Title: Re: How many revolutions of an engine
Post by: re japi on November 20, 2020, 06:15:12 AM
Post by: re japi on November 20, 2020, 06:15:12 AM
Think about TopFuel drag cars for example, how many revs they do on quartermile? 5 or 6 
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