Ok so what's involved in engine upgrades?

[MidNightIllusions]

6hp intek briggs and stratton engine.

Can I buy a cam for it? If so what else would be involved?
Would I have to do valves and jets?

Let me know what you pros think.
Thanks.

 

[2SlickNick]

I have the same engine. I am just putting on a custom homemade exhaust with muffler and fabricating an air filter adapter. Other than that I that is all I plan for my Murray shopping Cart kart build. I might have to re-jet , hope not
Or I may end up getting this one...http://www.bmikarts.com/Air-Filter-adapter-for-Tecumseh-Briggs-OHV-Engine-_p_463.html

 

[Gokartbill]

6Hp intek is basically a unmodified briggs animal. Look what makes up a animal motor and that will give you some ideas.

 

[MidNightIllusions]

Ok I did search the the engine an I heard about the Animal engine. But I couldn't find any mods on what you can do and what to use.

I already have a large intake on it. But I wasn't sure what to do about the exhaust?!? Does their need to be any back pressure threw the exhaust on these OHV engines??

 

[Gokartbill]

You always need backpressure with a engine. As long as you got some kind of a pipe on there u will be fine. Did a quick search on parts for animal engines. Here is what i found. Take a look at the features at the bottom of this link. This will tell you what u need to make a homemade animal. http://www.briggsandstratton.com/engines-racing/racing-engines/karting/animal

 

[MidNightIllusions]

Ok thanks when I get more time I'll check that out.

How is there back pressure with a wide open pipe LOL?!?

 

[Gokartbill]

How wide open of a pipe are you talking about? I have a rvl j pipe open header on my clone and it runs great.

 

[Poboy kartman]

You always need backpressure with a engine. ]

Backpressure is a fallacy. ....the only time it comes into play is in multiple cylinder engines....and it's not really backpressure....but cyclic scavenging at work. ....one cylinder helping another to draw in intake gases.....and the timing of those events. ....

Now if you are talking about scavenging. ....the suction that the escaping gasses of the exhaust create to aid in filling the combustion charge......probably. .....that's why tuned exhausts work.....

But "backpressure" by definition implies that there needs to be a restriction in the exhaust flow.....and. ...it just ain't so Virginia. ......

So what pipes do is let the suction of the escaping exhaust gasses scrub the cylinder of the last little bit of combustion out of the combustion chamber as the intake charge is coming in as the intake valve is just opening.....hence "valve overlap" in cam timing.....

But without any external exhaust. ....any engine will run. ...just not to maximum potential. ......

 

[Gokartbill]

Well, u learn something new everyday...

 

[MidNightIllusions]

How wide open of a pipe are you talking about? I have a rvl j pipe open header on my clone and it runs great.

Well you know those stock gay muffler that screw into the head.
So what about like a black straight pipe threaded on one end and that's it. About 8" to 10" long??

Just asking before I do something that's not right.

 

[Scout]

There was a guy here who always said that a 6" pipe nipple was the best exhaust ever. I don't believe it, but in general stock mufflers are restrictive, and restrictive is bad for power, so I bet it was better than stock.

Is it a flathead, or overhead cam?

 

[fowler]

U still need scavenging with single cylender engines

It's that one cylenders exhaust that's doing the scavenging not other cylenders

Your thinking of extractors