Oompf or more oompf

[B-Maniak]

Increasing the amount of air entering the engine is theoretically supposed to increase the oompf. Some people try this with air filters designed for racing, where engines are dismantled after each race.
I wanted to keep the quality of filtration while increasing the quantity of air, so I tried it without the snorkel of the original air filter.



Here's the result, not on a dyno unfortunately, which I don't have, but by comparing the compressions. The first line at the top is the stock engine, the second line with the rocket sprockets and the third with the rocket sprockets but without the snorkel.



Even if practice matched theory, for once , I put the snorkel back on because of the increase in noise. And yes, it could be a good idea only in sunny countries.

 

[Hay Ewe]

Hi
Interesting, but I dont understand how you measured the compressions?
Are you able to explain that better please?

Thank you

 

[Steptoe]

Different length throttle body/air box tubes alters the torque, which maybe more beneficial than the oomph you describe …. fit some RS tubes and see if you notice the difference

 

[B-Maniak]

Hi
Interesting, but I dont understand how you measured the compressions?
Are you able to explain that better please?

Thank you

Hi Hay,
You just need a compression tester, a tool you have to screw in place of the spark plug. Or just press it in, depending on which end you have.

 

[B-Maniak]

Different length throttle body/air box tubes alters the torque, which maybe more beneficial than the oomph you describe …. fit some RS tubes and see if you notice the difference

Will try that if I can find some, thanks for the tip.

 

[sproggy]

I find it very difficult to believe that removing the snorkel can make any difference to compression, which is measured at very low revs (whatever the starter turns the engine over at) where optimised airflow, particularly outside of the air filter, isn't a significant factor. It might make a difference at very high revs but you couldn't measure that difference using a compression tester. Therefore I'd suggest that your compression tests either aren't reliable or are not directly comparable (different conditions).

 

[Steptoe]

I find it very difficult to believe that removing the snorkel can make any difference to compression, which is measured at very low revs (whatever the starter turns the engine over at) where optimised airflow, particularly outside of the air filter, isn't a significant factor. It might make a difference at very high revs but you couldn't measure that difference using a compression tester. Therefore I'd suggest that your compression tests either aren't reliable or are not directly comparable (different conditions).

If only BMW knew it was so simple, they could’ve saved millions on engine development

 

[B-Maniak]

I find it very difficult to believe that removing the snorkel can make any difference to compression, which is measured at very low revs (whatever the starter turns the engine over at) where optimised airflow, particularly outside of the air filter, isn't a significant factor. It might make a difference at very high revs but you couldn't measure that difference using a compression tester. Therefore I'd suggest that your compression tests either aren't reliable or are not directly comparable (different conditions).

In theory, there is no difference between theory and practice. In practice there is.

Therefore, I suggest that instead of just believing, you should do the test and bring real evidence to the table and not just beliefs which, by definition, are not based on anything tangible.

 

[sproggy]

OK, I’ll rephrase for clarity. You are mistaken in your conclusions. But if you believe you’ve increased compression and created ‘oomph’ by removing the snorkel I’m happy for you.

 

[Ian J Hartley]

Never ceases to amaze me the lengths people will go too to get more power out of a tractor.

But each to their own, over the years there have been many innovations and mods available, by a host of developers, but surprisingly the goal of turning a tractor into a sports bike has never been realised.

Nevertheless, Keep up the good work,

 

[B-Maniak]

OK, I’ll rephrase for clarity. You are mistaken in your conclusions. But if you believe you’ve increased compression and created ‘oomph’ by removing the snorkel I’m happy for you.

I wonder how you can stay serious saying this.
IMHO, reading the results of a compression tester has nothing to do with believing.

Sometimes you have to go to extremes to make it easier to understand. Breathe with your mouth wide open, then with your mouth almost closed. Can't you feel any difference?

Do the experiment and inhale for 2 seconds. Do you feel more air in your lungs with your mouth wide open or with your mouth almost closed?

 

[sproggy]

Yeah, just like reading the results of a compression tester has nothing to do with analysing changes in power or torque.

Enjoy.

 

[PIGGLET]

Never ceases to amaze me the lengths people will go too to get more power out of a tractor.

I thought it was a ditch pump engine.....

 

[Hay Ewe]

I understand / know how to take compression measurements, I was questioning how you did it with the engine running.
It seems that you didn't, only cranking the engine over with the starter motor.
Is this correct?

 

[B-Maniak]

I understand / know how to take compression measurements, I was questioning how you did it with the engine running.
It seems that you didn't, only cranking the engine over with the starter motor.
Is this correct?

The usual method is to remove a spark plug and place the tool in its place. Open wide the throttle and crank the engine.
As a result, when our twin-cylinder engines are missing a cylinder, it's not always easy to get the engine to start, even if it does sometimes start shakily on one cylinder.
But that's not the point of starting the engine either.

Yeah, just like reading the results of a compression tester has nothing to do with analysing changes in power or torque.

Enjoy.

We can all see that you're a fine connoisseur of mechanical things. In your opinion bringing more air in an engine (increase compression in other words) won't change anything. I wonder why turbo's were invented. To add power and torque perhaps?



To return to the original subject, differences between belief and practice about the amount of air that can pass through a small hole or a large hole, without trying to pass the ton, here is a very simple experiment for you to do:
Take your right index finger and plug your right nostril. Close your mouth and breathe in through your left nostril only. Note how much air comes in.
Then remove your index finger from your right nostril. Open your mouth wide and inhale. Can you feel any difference? Can you feel any difference, even when you're sitting on the sofa in idle mode?

Have fun

 

[sproggy]

I'm too busy to waste my time messing around with your pointless and irrelevant experiments, or with continuing to be involved in this discussion - I need to go and test my front tyre pressure with and without the mudguard fitted to see which way will give me the most vavavoom.

 

[Wrigsby1]

I thought it was a ditch pump engine.....

You're thinking of a Guzzi... Oilheads are probably MF 135's in spirit and I've always found removing my earplugs is a great power increaser but the tinnitus keeps me awake... You can't win can ya...

 

[Oldrat]

 

[Wrigsby1]

View attachment 324638

Foot warmers rather than knee breakers for us lanky twats...