hey I think you better take this up with Randy,cause I am clearly over my head........................jeeziz,thgis is outa control.OVER AND OUT!

 

No no, it's:


Suck - intake
Squeeze - compression
Bang - power
Blow - exhaust

Here's the explanation:

Suck is when the intake valve is open, the piston moves down, and the intake charge is introduced to the combustion chamber.

Squeeze is when the intake valve is closed, and the piston moves up, compressing the intake charge and increasing the potential energy.

Bang is when the spark is fired and the piston is pushed down with force to turn the crank.

Blow is when the exhaust valve is open and the piston moves up, expelling the combusted mixture.

Hope that helps!

Randy

 

With positive pressure in the intake manifold, it would be blow (or vent), squeeze, bang, blow, unless you have too much boost then it's blow, squeeze, BANG, bang, bang, bang, bang, screeeech.. Depending on which part of the engine you were personifying at the time. That's why boost almost never sucks..


Jim

 

I understand Randy and in no way meant that you were turning down the 19% so you could make bigger profits. i was just responding to a post that said you were losing money b/c you weren't installing 19% pullies and b/c of that you must know what you're talking about. My point was that not selling one thing and selling something else doesn't prove anything - good or bad. I didn't mean anything negative by any of my comments.

 

Wow indeed!!! What a thread so much information. And with that information I am as confused as ever about what to get now Looks like I will be waiting to see more testing for the 19% and how it handles in the long haul. I will never drive on a track and never be driving in the high rpms for very long unless I have the sudden urge to floor it through 3rd gear only (already at about 90 something at that point or more i dont remember) I just want something very reliable, and something thats not going to break down all the time. So I will ahve to wait and see the facts of long term use, and heat and all the other stuff that was talked about.

I just really like the sound of lower end boost and power over the higher rpms, I am a street light to street light kind of driver.

 

Kyle00 - it sounds like the 19% will be perfect for you. Enjoy! You won't regret it.

 

No offense, but by the time everyone is satisfied that a modification [like a pulley] is safe and relieable, the cars will all be out of warranty and new products will be taking their place! After all, there is already another motor planned for the Mini, and the mod routine will no doubt be different.

Manufacturers tend to be conservative in their products, which is why the aftermarket exsists. Even the Corvette guys, who can get a factory warrantied 400+ hp Z06 are making modifications!

That the JCW uses an underdrive pulley and is a factory option should tell you something. And, it's still considered a street car. So, be cautious if that's your nature, but why are you following this thread?

 

(supercharger reduction pulley - not to be confused with an underdrive pulley that spins slower so the accessories don't drain as much power from the engine, the supercharger reduction pulley spins faster creating more boost and power in the engine without affecting the accessories). :smile:

 

clover, remember that the water pump, which runs off the supercharger directly, is also spinning 19% faster too

 

The latest news on cavitation of the water pump is that is would take spinning it way more than 19% and it would have to be constant - not occasional high RPMs. It also would occur quickly - it's not something that would occur over time. So that tells us that none of the current aftermarket pullies bring about a risk of water pump cavitation. There is no risk.

 

I'm not really talking about cavitation,but the bearings in the water pump,which by my own experience is the thing that goes south first,and with the pump spinning statistically faster(19% ) ,then the bearing failure will occur 19% faster.Yes?