Chainsaw engine / Projects *PICS ADDED*
 

I wanna put a chainsaw engine on a bicycle. What kinda RPM's these things run at? I want to work it out so it has about a 20mph cruise and a max of say 35mph spurts of raw powar.

I don't weight much and it's a 40cc (i think) engine, so hopefully that will be possible.

Re: Chainsaw engine. Working RPM?
 

get me the model/size of the saw and I'll get the specs from my small engine mech. ;)

Re: Chainsaw engine. Working RPM?
 

kick ass. I'm pretty sure its a 40cc Poulan but it could be one of the smaller engines. I'll check it out after work though to be sure it's not the 33 or 34cc.

Thanks :)

http://www.poulanpro.com/poulanpro/g...oryID=CHAINSAW

Re: Chainsaw engine. Working RPM?
 

I have a Stihl, and I think it runs at about 13,500rpm.

Re: Chainsaw engine. Working RPM?
 

pm me with the info cuz I already forgot about this thread, lol. You will be around around there though^^^^

Re: Chainsaw engine. Working RPM?
 

10k is about max on a stock setup,

Re: Chainsaw engine. Working RPM?
 

^^^^depends on the size of the saw ;)

Re: Chainsaw engine. Working RPM?
 

i doubt hes going to use a $300 chainsaw to make a minibike ;)

and its not all about the rpm's ;) ;) ;)

Re: Chainsaw engine. Working RPM?
 

Damnit ---- me I forgot to get that info. I'm sorry, I'll get it for real tonite :-[

Took the saw apart, got the bitch of a clutch off. Realized the headstuds also act as motor mounts...goddamn cheap manufacturing bastards!. I'm gonna have to do some HMT'ery to get this beast to make it work so instead of doing a total hack-job as I had first intended, giving the amount of work to make this work correctly, I might have to spend a little time with it and do it semi-right. That was a long sentence.

Anywho, it should be sweet. Hopefully I'll have it done in a month or so.


HOW BADASS WOULD THIS BE?
http://images.kmart.com/assets/image...0000120431.jpg

Re: Chainsaw engine. Working RPM?
 

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

Re: Chainsaw engine. Working RPM?
 

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


Do they make 2 stroke 125cc chainsaws? ;D

Re: Chainsaw engine. Working RPM?
 

i've got a ported/polished/raised CR briggs 11hp block doing about 16 17 hp if youre interested

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.

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.

Re: Chainsaw engine. Working RPM?
 

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

Re: Chainsaw engine. Working RPM?
 

What carbs do you guys run and how high can those beasts rev?

Re: Chainsaw engine. Working RPM?
 

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.

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.

Re: Chainsaw engine. Working RPM?
 

Damnit I just realized thats a 23cc engine. Poulan 2375. Well im gonna build it anyways. :-\

Re: Chainsaw engine. Working RPM?
 

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

Re: Chainsaw engine. Working RPM?
 

Sounds good I'll take the head off today and look at the ports. Dumb question, but should I just make the ports bigger? How much bigger?

Re: Chainsaw engine. Working RPM?
 

.125" is about as thin as you can get the crank, you can go thinner on the head if it's got 1/2" that sleeves into the crank. exhaust ports in the head, along with the intake ports in the head/crank.

Re: Chainsaw engine. Working RPM?
 

Flatheads have significantly better bsfc and detonation resistance than any other engine design. Boost one, or go fist yourself!

Re: Chainsaw engine. Working RPM?
 

alrite bishes. Doin this straight up HMT style. I got a 2 wheel project and the 4 wheel project.


Got some work done today:

Here's the scooter:
http://67.33.14.41/cart/cart1.jpg


Here's the scooter's heart. :awww: I made the part that will come in contact with the tire out of some bushings and JBWeld:
http://67.33.14.41/cart/cart2.jpg

On to the cart:

The rear axle (Stock)
http://67.33.14.41/cart/cart3.jpg


Got the new sprocket tacked on, one new wheel temporarily on:
http://67.33.14.41/cart/cart5.jpg


Throttle lever for the cart. free and effective
http://67.33.14.41/cart/cart6.jpg


Mocked up rear axle on frame with risers installed
http://67.33.14.41/cart/cart7.jpg


Damn thats close. Good thing I have yet to put air in the tires
http://67.33.14.41/cart/cart8.jpg

Re: Chainsaw engine / Projects *PICS ADDED*
 

this is going to be cool...keep up the work i wanna see this thing

Re: Chainsaw engine / Projects *PICS ADDED*
 

Well guys i'm officially an idiot. Im sitting here at work thinking about the power transfer on the cart and realized I welded the small gear onto the chainsaw clutch itself and not the flywheel. Oh damn am I stupid. Hopefully it's not too FUBAR and I can "unweld" it and do it properly. :1

Re: Chainsaw engine / Projects *PICS ADDED*
 

For our high mileage cars in HS we used a tapered cone on the crankshaft and bolted the motor on a plate with tubes welded to the bottom, it would slide on smaller tubes to make the engine move so the tire would come in contact with the bigger or smaller part of the cone, the point on the outside to get us going and move it into the big part to get some speed, these things could really haul ass sometimes close to 50 mph at road america. thats movin when ur crunched up in a car that weighs less than 100 lbs. oh yeah we got 580 miles per gallon with that bitch.

Re: Chainsaw engine / Projects *PICS ADDED*
 

-----. I wanna see you running 90mph.

http://www.3w-modellmotoren.com/moto...ei3W212ib4.jpg

http://www.3w-modellmotoren.com/moto..._212b4_QS.html


Hubvolumen / Cylinder capacity / Cylindrée 212 ccm / 12.93 cu.in
Leistung / Power / Puissance 21,5 PS / HP / CV; 15,8 kW
Bohrung Æ / Bore dia. / Alesage 44 mm / 1.73 in
Hub / Stroke / Course 35 mm / 1.377 in
Drehzahlbereich / Speed range / Vitesse de rotation 1000 - 7500 min-1 / rpm
Gewicht / Weight / Poids 5730g / 12.61 Ibs - incl. Zündung / ignition
Kurbelwelle / Crankshaft / 5 Kugellager / 5 Ball bearings / 5 Roulement à billes
Pleuel / Connection rod / Bielle Nadellager an beiden Enden / Needle bearings on both ends / Roulement à aiguille aux deux cotés
Benzin / Gasoline-Version 1 : 50 - 1 : 80 Mix
IIS - Zündung / IIS - Ignition / V.cc allumage 6,0 V
Propeller / Hélice 34 x 10; 35 x 10; 35 x 12; 36 x 10
2-Blatt / 2-bladed / à 2 pales;
27 x 14; 30 x 12; 32 x 12
3-Blatt / 3-bladed / à 3 pales

Re: Chainsaw engine / Projects *PICS ADDED*
 

http://www.3w-modellmotoren.com/moto...84i_B4_TS.html

60hp madness..

Re: Chainsaw engine / Projects *PICS ADDED*
 

Took the cart for a ride. Not very torquy. lol. Chain keeps popping off so I gotta fix that. Scary at anything over ~5mph

http://img106.imageshack.us/img106/3...1mediumnp3.jpg

http://img400.imageshack.us/img400/8...2mediumun2.jpg

http://img47.imageshack.us/img47/504...3mediumzx5.jpg


Here's the scooter. Still a good bit of work to be done. Hopefully it will actually move once I'm done.

http://img485.imageshack.us/img485/1...4mediumds0.jpg

http://img385.imageshack.us/img385/1...5mediumsv7.jpg

Re: Chainsaw engine / Projects *PICS ADDED*
 

BADASS. Flux core to the end. :6

Re: Chainsaw engine / Projects *PICS ADDED*
 

lol! ------- awesome!

Re: Chainsaw engine / Projects *PICS ADDED*
 

i built a scooter like that but the pettle car is sweet. wheres the vids. :6

Re: Chainsaw engine. Working RPM?
 

If you want to build something with power get ahold of the saws I ran. Stihl MS 880 Magnum. 121.6 cc 8.6hp

Re: Chainsaw engine / Projects *PICS ADDED*
 

thats pretty cool. i am working on a weedeater engine on a razor scooter right now. i will post pics and vids later this weekend if it acctually moves

Re: Chainsaw engine / Projects *PICS ADDED*
 

try a 75cc 2stroke ported to ---- with 11.8:1 (what the gauge says) compression..

Re: Chainsaw engine / Projects *PICS ADDED*
 

there are gauges that measure compression ratio?

Re: Chainsaw engine / Projects *PICS ADDED*
 

i am just working with what i have. so far i only have $17 into the whole project

Re: Chainsaw engine / Projects *PICS ADDED*
 

i ripped mine from a minibike made into a snow blower

Re: Chainsaw engine / Projects *PICS ADDED*
 

thats awesome

a smaller sproket on that 4 wheeler would be better