How much does the typical 4-5hp Briggs and Stratton lawn mower engine need in CFM. I want to try a little experiment to try and get more HP out of it....it involves a computer fan

------------------

--Adam--
1987 Blue GT 5-speed
IM AOL: FieroGT5speed
16 years old and already selling my stuff to pay for repairs to my Fiero...which i sold my stuff to buy in the first place

Depends on how big, etc.

5 hp is about 11.5 cubic inches
They run at about 3600 rpm.

11.5 cubic inches = .0067 cubic feet X 3600 rpm / 2 = 11.97 cfm X efficiency of the intake which is about .7 or so = 8.38 cfm, more or less.

Think about a leaf blower instead. I've actually seen a guy do that and he made 3 psi boost.

John Stricker

quote Originally posted by GTFiero1: How much does the typical 4-5hp Briggs and Stratton lawn mower engine need in CFM. I want to try a little experiment to try and get more HP out of it....it involves a computer fan

yeah but a computer fan is cheap, found one on ebay thats a tri-fan. A single cumputer fan puts about 32cfm so hooked to a 12 volt battery on the mower could boost the power some. The engine is 190CC

The CFM won't do anything if it doesn't have the power to make some PSI in the intake, and a computer fan won't.

open up the intake, exhaust, and run mobil 1 in it should be a strong 1 HP gain

my lawn mower is a 4-3/4? horse Lawn boy i opened up the air filter a little and removed the baffle in the muffler,
i was gonna put a type R sticker on it..... (nevermind)

im my snow blower i run Mobil 1 5w-30

------------------
Rich
white 86 se, 2" drop, coil overs, KYB's. CRX intake, ported manifolds

[This message has been edited by $Rich$ (edited 05-02-2003).]

"Turbo-Toro"

------------------
jetman "aka" Dangerkitty To The Rescue

Heck just add some paint thinner to the fuel

quote Originally posted by Hank is Here: Heck just add some paint thinner to the fuel

what is mineral sprirts going to do NOTHING

now model airplane fuel has nitro in it
that will give a kick but be carefull

BTW fans donot add power
you need compressed air
not moving air

------------------
Question wonder and be wierd
are you kind?

[This message has been edited by ray b (edited 05-02-2003).]

Lawnmower engine displacement? I think 2.5, but that's for a riding lawnmower.

Is this going to be a new option for a Fiero engine swap? I'm not sure that the gas mileage is there.............................

Try any Civic performance forums?

[This message has been edited by Mach10 (edited 05-03-2003).]

quote Originally posted by jetman: "Turbo-Toro"

Heh, could always try some of that "Compressed Air" thats used to dust the inside of computers and camera lenses.. turn it upside down, boom cold charge too

JZ

------------------

- 2.8v6, 5spd
- no cat, msd ignition/coil, K&N

another idea...

You have an air compressor with a regulator?

JZ

------------------

- 2.8v6, 5spd
- no cat, msd ignition/coil, K&N