Drilling holes on side of block?

[Dynoracecams]

I know this guy that took his briggs enigine and had it built. He bored it out and deck the block. Then he drilled a holl on the intake side on the carberator side of the valve i was wounder if anyone had any info on how it work and if i could do somthing to make it better

 

[oscaryu1]

What do you mean make it better? More power?

 

[Dynoracecams]

Yea like making it bigger or hooking nitrouse in it or somthing like that

 

[2or3wheels]

must be for injecting nitros?

 

[Jblankster]

i know wut its for, im going out now. no time to explain. ill be back!

 

[oscaryu1]

He was planning to either inject No2 through the port, or hook it up to a fuel pump... Like the Mikuni Fuel Pulse Pump. The pulse comes from the carburetor, which the pump then pumps gas into the carb...

 

[jr dragster T]

He was planning to either inject No2 through the port, or hook it up to a fuel pump... Like the Mikuni Fuel Pulse Pump. The pulse comes from the carburetor, which the pump then pumps gas into the carb...

The pulse comes from the intake or the block breather.

 

[Jblankster]

^he said it. but i know some people even use the governor hole, or yes drill a hole in le side.

 

[oscaryu1]

Thanks for correcting me

Governor holes are fine (speaking about GX series). However, there's not always a gurantee of pulse, and there's a higher risk of oil going in there.

 

[jr dragster T]

Yeah I agree with him THE best pulse is from the intake.

 

[oscaryu1]

There's no real use of a fuel pump if you're running a stock setup... Even with few modifications, a new jet would solve it...

 

[jr dragster T]

There's no real use of a fuel pump if you're running a stock setup... Even with few modifications, a new jet would solve it...

Yes there is a need for a fuel pu
mp if the fuel tank is lower than the carb then you need somthing to bring the fuel to the carb.

 

[Jblankster]

^what he said. and in that case you can run a remote tank. which is cool

 

[oscaryu1]

If you're running a stock setup, I doubt you'll have a remote tank or a gas tank wayyyy below the carburetor.

 

[jr dragster T]

It doesnt hav to be Wayyyy below the carb to need a pump. If the tank is 1 inch below the carb it NEEDS a pump.

 

[oscaryu1]

Look up some old Briggs engines. Carburetors, with fuel tanks bolted right next to the oil plugs... No pump either. Just a metal line running from the tank to the carburetor.

EDIT - Also look up some of those 3HP engines with the carburetor on one side of the engine, and the gas tank on the other side.

 

[Jblankster]

^im sure they had fuel pumps. theres no other way. i think at least, idk much about carbs.

 

[oscaryu1]

Sure... it was a plain carburetor...

No fuel pumps. Also, on my Briggs 3HP, the fuel pickup tube was around 4"-5" long.

Some carburetors don't need fuel pumps because they use a diaphram n' stuff...

 

[Jblankster]

oh yea those kind, you made it sound like they were on the other side of the damn engine.

on the 5hp flat heads have a diaphragm carb with a pickup tube, the air blowing over the tube creates a vacuum which pulls the gas into the carb. you can try it yourself with 2 straws

 

[oscaryu1]

oh yea those kind, you made it sound like they were on the other side of the damn engine.

on the 5hp flat heads have a diaphragm carb with a pickup tube, the air blowing over the tube creates a vacuum which pulls the gas into the carb. you can try it yourself with 2 straws

I know that. Pulsa-Jet on 3-5HP's and Vaccu-Jet or something for the 2HP's (very simple design)...

They were on the other side :biggrin5: