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HomemadeTurbo - DIY Turbo Forum (https://www.homemadeturbo.com/)
-   Fabrication (https://www.homemadeturbo.com/fabrication-14/)
-   -   Chainsaw engine / Projects *PICS ADDED* (https://www.homemadeturbo.com/fabrication-14/chainsaw-engine-projects-%2Apics-added%2A-69315/)

0b00st0 10-31-2006 02:04 PM
Re: Chainsaw engine. Working RPM?
 
Originally Posted by SloS13

That is awesome. I gotta build one, but with a really powerfull chainsaw.


Do they make 2 stroke 125cc chainsaws? ;D

Smith-02 10-31-2006 02:12 PM
Re: Chainsaw engine. Working RPM?
 
Originally Posted by TorganFM
Build a lawnmower. All you need to do to make them fast is take the blades off, remove the pulleys, put a big pulley on the motor and a small on on the transaxle (stock is the reverse) then build a tension clutch. After a few days work you have a 35mph lawnmower. That's just to get it going though, you'll soon want to redo the steering, and lower the front down and widen it out, but it's a work in progress. Go find an old 80's Murray, Dynamark, Deere, etc with a Peerless transaxle and an engine 11hp or larger. Shouldn't be more than $100 plus $80 for pulleys and a belt
i've got a ported/polished/raised CR briggs 11hp block doing about 16 17 hp if youre interested

Cray91 10-31-2006 02:41 PM
Re: Chainsaw engine. Working RPM?
 
Friend of mine is a small engine mechanic. He is into pulling though. He runs a Kohler in a murray.

TorganFM 10-31-2006 03:12 PM
Re: Chainsaw engine. Working RPM?
 
I wouldn't do a single cylinder unless it were an intek. It's hard to find cams for flat head briggs. Intek and vanguard is everywhere. My mower for this year was an 18hp briggs boxer twin. Next year I'll be building up my grandfather's Deere with a kawasaki OHV water cooled with an oil pump and all that crap. It'll be heavy, but reliable as nothing else. OHV is a lot easier to play with.

Smith-02 10-31-2006 03:42 PM
Re: Chainsaw engine. Working RPM?
 
Originally Posted by TorganFM
I wouldn't do a single cylinder unless it were an intek. It's hard to find cams for flat head briggs. Intek and vanguard is everywhere. My mower for this year was an 18hp briggs boxer twin. Next year I'll be building up my grandfather's Deere with a kawasaki OHV water cooled with an oil pump and all that crap. It'll be heavy, but reliable as nothing else. OHV is a lot easier to play with.
flathead is too, if you have an end mill and a stable drill press table. just up spindle speed, chuck in the end mill, mill off the raised gasket lip and ~.030 or so more than that. your valves will still clear the head no prob, and compression is up to high 7's over low 6's now.

porting is tricky. the exhaust port has thin casting on the outward edge of the elbow, easy to over-port and make a hole to open air. also porting the cast lines out of the intake and matching them to the gaskets help greatly

Ichi-Go 11-01-2006 12:12 PM
Re: Chainsaw engine. Working RPM?
 
What carbs do you guys run and how high can those beasts rev?

con 11-01-2006 12:30 PM
Re: Chainsaw engine. Working RPM?
 
Originally Posted by c0mpl3x
flathead is too, if you have an end mill and a stable drill press table. just up spindle speed, chuck in the end mill, mill off the raised gasket lip and ~.030 or so more than that. your valves will still clear the head no prob, and compression is up to high 7's over low 6's now.
that will give you more compression but like any flat head it shields the valves and kills flow. That is why flat heads are gay.

TorganFM 11-01-2006 04:26 PM
Re: Chainsaw engine. Working RPM?
 
A lot of basic flathead guys run B&S 4-bolt fuel pumps on stock carbs. You can however get performance kart carbs and get them to work, or use Intek/Vanguards on a flathead. Stock Intek carbs are good for most setups, but there are companies that make performance carbs intended for B&S twins. Check out heymow.com for more info.

idiot-stick 11-02-2006 08:06 PM
Re: Chainsaw engine. Working RPM?
 
Damnit I just realized thats a 23cc engine. Poulan 2375. Well im gonna build it anyways. :-\

Smith-02 11-02-2006 08:49 PM
Re: Chainsaw engine. Working RPM?
 
Originally Posted by SloS13
Damnit I just realized thats a 23cc engine. Poulan 2375. Well im gonna build it anyways. :-\
high octane as much as possible (watch using nitro fuel, it heats up good and you'll diesel after a little bit of hard running) and try to bump compression/port it. easy to port most little 2-strokes once you get them apart, its usually obvious


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