Actually.. i never compared the 2... They are used as 2 separate illistrations.. I am sorry that you guys can't seem to get the grasp of back pressure. And feel the need to speak on things that obviously know nothing about.

And just so I completely understand where you get this from..

You are saying that the mechanics and basic operations of the 2 engines are different? I am pretty sure they are both 4 cylinder engines... and they would both be affected by back pressure in the same manner correct? Or when you build a motor for drag purposes, back pressure makes no difference?

I am pretty sure that the same rule applies for both vehicles... so... yes.. you should please stop..

Thanks for playing

 

Its crazy... I know guys... but try reading a little bit before yal get diarea mouth.

http://www.dsmtuners.com/forums/freq...kpressure.html

 

So first they're two seperate illustrations. Then, you say the basic operations for the 2 engines are not different. Then you build on that and say that that they are both affected by back pressure in the same manner. So which is it, because you're contradicting yourself.

First off, I agree that the basics of engine physics are the same between those two motors. Hell, most motors out there share the same basics. However, the difference that a lack of back pressure on a Honda Civic would affect performance would be nowhere near what a full on drag bike would be affected. The point I'm making is that there are a TON of factors that come into play when making a motor breathe effectively, while your basing comparisons on subjects that are night and day. With the level of rationale on your example you're saying that people should run header out on everything, which is ridiculous.

There are tons of factors that go into an effective exhaust system. I've been around a few builds in my time, and the research that goes into them is absolutely insane, and then they're always looking for better components once it's together. If you're gonna try to explain why you lost to a bike that was header out you need to make it more substantial than just searching forums, because most people could do the same thing and combat your argument. Forums are rumor and opinion mills, not fact factories.

 

Learn how to spell, too. Diarrhea. As in, you got retarded flowing out of your posts like diarrhea.

 

+1 as long as I can get track take offs at a decent price, i'll continue to ride on them.

 

I understand the logic to buying used race tires, they're cheap and most of the usable tread is in the center.
The downside to take-offs and why I will no longer use them (personal choice) is:
-they're race tires that are designed to operate at a temperature you will never reach on the street so they'll never be as sticky as a good street tire
-they're used
-2-3 heat cycles is considered the 'life span' of a race tire, if you're lucky enough to find a set with only one heat cycle then it would be better than 3.

I know plenty of people that run take-offs and I know plenty of people that would never run take-offs.

You can try to convince yourself all you want that a 4 year old tire is a good tire, it won't affect me in the slightest way. Sure there's some legality to what the rep says but there's information that tells them why they should say that, sure the tire is ridable but they aren't going to say it's anywhere as good or capable as a new tire; eating stale cereal isn't going to kill you but the majority of people prefer it to be fresh because it tastes better.
The concept is certainly not the same with take-offs either, heat cycles break down the tires extremely fast which is why most racers run a new set of tires for each race.

Regardless if you are a fresh or seasoned rider a good set of tires is one of the most important parts on the bike, old street tires or used race tires do not offer the grip they were initially created with.

You'll learn the hard way.

 

i dont need to try, ive done it several times without issue.
You do you, and i'll do me, see you at the track champ.

and FYI: 2-3 heat cycles is NOT considered the life of a tire, theyre actually good for more than that.

 

Ok... first off.. i did not contradict myself. I stated that I did not compare the 2 in my original post, which I didn't.

I then went on to show that it doesn't really matter if I compared the 2 or not. It is still the same basic principle. I understand the the back pressure between the 2 is going to be different and that they are not going to use the same application. The only fact that I am getting at is that it was originally stated.

This is a false statement. First, the goal of modifying an exhaust is to eliminate back pressure as possible without causing scavenging. Second.. the bike was not "totally" missing an exhaust. It was just missing a muffler.

The fact of the matter is that my bike had a slip on and his bike had no exhaust... So.. we were pretty evenly matched. If anybody had the advantage he did. That is all I was saying... then everybody wants to get off on this wierd tangent about back pressure and making false statements, to try and prove some null point.

I can tell you this.. that my bike had a foot long pipe with a standard can on it.. It was dyno'd... Then I removed that exhaust and installed not even 6" can on the mid pipe and picked up almost 20 hp on the dyno. So... I am positive that removing a 6" straight thru muffler is not going to drop 20hp again. So running a bike without a muffler WILL ADD HP... not take it away..

Now.. if the entire exhuast was missing.. that would be a different story. Any engine needs a proper application for optimal HP.

edit:
and I am not trying to explain why i LOST persay.. I won more than I lost that night that we ran... I was merely clearing up that I did not have some advantage over the CBR.. it was pretty much down to the rider. Which I have a little more time on a bike so I should be expected to win... but it was extremely close each run, the margin of win was by about half a bike.

 

damn, aint shi ton that video. oh well.

 

The last sprockets I had were vortex, and I completely shattered the teeth on the rear. I will not run them again.

Thanks man!