My lil' 5HP guide...

[chain]

Went through the whole thread and saw the pics! thanks!

 

[Nexto]

So if you do all the things that are listed in the beginning of the thread how much power could you pull out of a 5 hp engine? just looking for a ball park!

 

[beansdaddy78]

man this stuff is awesome , could you please send me pics of as much as possible, im ignorant to alot of the terms and the pics make it moron proof for me. awesome work also wanted to say thanks

 

[DeathStarr89]

Here is another way you can help out a briggs (or any engine).

Crank case evacuation via the exhaust:

pulls a vacuum on the crank case and improves ring seal plus no re-burning the blowby. Works best with an open header but still does the job with a muffler.

I just bent up a piece of steel brake line, cut the one end off at 45 degrees, drilled a hole in the header and welded the tube in so that the end is about in the middle of the header. Normally you'd run a check valve as well but i wasn't too worried about that in this case.

More info: http://www.google.com/#hl=en&sugexp...w.r_qf.&fp=ac26b312fb52f5b8&biw=2144&bih=1014

 

[cody]

Can anyone list what I can do and what parts I need to buy ( with web links cause I can not find anything) I'm trying get a 5hp Briggs some juice and try to not spend over $100 is this possible. This will be on a cart if that helps

 

[chain]

I am no expert in fact I'm just getting ready to build up my first, but if you read the guide the ports, and eyebrows just require a deremel, a new carb( can't help with what you would need) and a header would be around 100.00

 

[Kaptain Krunch]

Here is another way you can help out a briggs (or any engine).

Crank case evacuation via the exhaust:


pulls a vacuum on the crank case and improves ring seal plus no re-burning the blowby. Works best with an open header but still does the job with a muffler.

I just bent up a piece of steel brake line, cut the one end off at 45 degrees, drilled a hole in the header and welded the tube in so that the end is about in the middle of the header. Normally you'd run a check valve as well but i wasn't too worried about that in this case.

More info: http://www.google.com/#hl=en&sugexp...w.r_qf.&fp=ac26b312fb52f5b8&biw=2144&bih=1014

Better off with a puke tank, these lil engines love to spit oil out when over revved, your gonna be makin a smoke screen when you really get on it.

 

[DeathStarr89]

Agreed, as that cool bore wore out it got worse. Still a good mod though. I'll be doing the same with the latest GX390 build.


Cody, Briggs 5HP headers are dirt cheap on Ebay. I think the last one i bought was like $7+ shipping. Here is one for $4 + $7.50 shipping: http://www.ebay.com/itm/BRIGGS-and-...29765?pt=Go_Karts&hash=item2326825025&vxp=mtr


here is an even better one: http://www.ebay.com/itm/racing-brig...pt=Race_Car_Parts&hash=item589a63f16b&vxp=mtr



Eyebrows take a couple minutes with a dremel, easy mod.


http://www.ebay.com/itm/Briggs-5hp-...pt=Race_Car_Parts&hash=item4ac0aa5034&vxp=mtr

Also a good mod.

 

[grunta]

where you say dont take over .030" is that using a standered gasket or copper? just thinking that standered gasket is about .053" and im going to use copper thats .012".
guessing there will be gains in compression by using thin gasket. anyone elaborate on this for me?

 

[rwd4evr]

anybody know if five horse briggs vertical shaft cranks are the same critical dimensions as a horizontal? not worried about pto size.

 

[oscaryu1]

where you say dont take over .030" is that using a standered gasket or copper? just thinking that standered gasket is about .053" and im going to use copper thats .012".
guessing there will be gains in compression by using thin gasket. anyone elaborate on this for me?

In theory, you could take off as much as you wanted until the valves started hitting the heads. The thinner the better, generally you'd want under .040" for decent squish clearance/velocity. So .040" head gasket, assuming zero piston/block deck clearance.

anybody know if five horse briggs vertical shaft cranks are the same critical dimensions as a horizontal? not worried about pto size.

Shorter PTO usually. Not sure about the rest.