Getting more umph outta a cheap engine

[impfected]

The tech specs on the engines show that they have mounting holes. Weather they are in the correct location is to be seen. My friend has a machine shop and I'm an auto tech so the two of us can probably come up with a cheap adapter. Maybe add a turbo and get 7 hp out of the 3hp engine

Anyone have a good link/source for a Briggs and stratton muffler that si really quiet of have plans to make one. I get real tires of hearing that old engine blasting away in my ear when longarming it.

[Reno badboy]

My guy has one ,but it's REAL spendy! Like $350.00 built by super trap. The one that uses seperate plates. Thats the other good about Hondas , alot quieter! I saw one guy that took one of the round mufflers and cut the end off and welded on a small car muffler with a piece of pipe that went under water at the end, but the blub blub blub was worse than the regular noise!!!! Plus it made you crazy under water!!!!

[rivraton]

The tech specs on the engines show that they have mounting holes. Weather they are in the correct location is to be seen. My friend has a machine shop and I'm an auto tech so the two of us can probably come up with a cheap adapter. Maybe add a turbo and get 7 hp out of the 3hp engine

Anyone have a good link/source for a Briggs and stratton muffler that si really quiet of have plans to make one. I get real tires of hearing that old engine blasting away in my ear when longarming it.

Nitrous oxide ( gas)

[Hoser John]

Briggs makes 2 models of low tone mufflers as dealers carry them. I have the super one that just rumbles and sure quiets everything down real nice like and exhaust deflector mounts on it easily too for straight up exhaust expelsion-tons a au 2 u 2 -John

[Reno badboy]

NOS is fun , but murder on motors!!! Ask me how I know this!!!! And I have the schrapnel to show it!!!!! HEHEHE!

[Bill44]

You're best off buying a true tone muffler thats made four what you're trying to do.I once welded some metal conduit to a muffler so I could run it under the water.I sure did the job.But it made the motor run hot.Real hot.Burned a hole in the piston.Impfected you asket about threading the shaft.I've never do a 5/8 but I have done a 1in not hard.Use a small u-bolt and steel tube or whatever you have laying around to lock the shaft down.Use alot of tap magic.I filled the key way in the shaft with j-b weld.I used some sandpaper turned upside down bent it around the shaft to get rid of the access j-b weld.and make it nice and round.wait a day or to and tap it.I'm sure someone on hear can tell you how far to run the threads on it.Bill

[russau]

bout time you started posting Bill! welcome!

[rivraton]

NOS is fun , but murder on motors!!! Ask me how I know this!!!! And I have the schrapnel to show it!!!!! HEHEHE!

There is such a thing as moderation, ya know...

[russau]

There is such a thing as moderation, ya know... [/quote]
ive heard of that,but then wheres the fun??

[Bonaro]

AV gas - re-jetting the carb, milling the head, high comp pistons, tuned exhaust...
There are a lot of things you can do to a brigs to get more power out of them...tried most of them and most end in a smokey failure because the basic motor is designed as a low RPM industrial motor.
look here.. http://www.diygokarts.com/vb/showthread.php?t=1128
Also do a search for "junior dragster" and find some pretty impressive stuff. All of these are built off a basic Briggs single cylinder design
You can make any amount of power you want...but...get out your VISA because it's gonna hurt
Basicly, you need to beef up the whole motor if you want more power otherwise it will fail.

Keep in mind that even if you do simple modifications to make more HP, the result is that the motor will be able to spin faster when under a full pump load.
The pump you are using is designed to put out a certain pressure at a given RPM and spinning it faster really doesn't give you much more GPM because it is now working outside its design.
If you want more pumping power then you need a bigger motor and a pump that is matched to it.

If you want it quiet you can fab in a generator muffler from a Honda. This is the easiest fix. It is critical that you use a muffler from a motor of the same size. If you just strip the muffler off the minivan and weld it onto the Briggs, it will be louder than the original briggs muffler. Mufflers work because they create back pressure and cause the sound waves to collide back on them selves. A small engine doesn't have enough flow to create any back pressure inside a huge muffler.

At least half to the noise you hear is coming through the cylinder head and walls. The generator muff will quiet the exhaust pipe but if you want it really quiet you need to upgrade to a water cooled motor