McCulloch conversion - RCCanada - Canada Radio Controlled Hobby Forum
RCCanada - Canada's Radio Control Hobby Forum
Large Engines Discuss Engines Used on Giant Scale Aircraft. Gas/Glow, as long as they're big!

Closed Thread
Thread Tools Display Modes
Old 05-02-2007, 10:57 PM   #1
Sonic Boomer
RCC Contributor
Sonic Boomer's Avatar
Join Date: Aug 2005
Location: Saskatoon, SK

Feedback: 0 / 0%
Posts: 303
Total Props: 0
McCulloch conversion

       Remove this ad - become a site supporter!
Here we go with another chainsaw conversion, this time it is a somewhat ancient 34cc McCulloch engine. is attractive, at least to me, front intake, rear exhaust so it will fit a slim cowl - I'm thinking 1/4 scale clipped wing Taylorcraft. Even though it is an oldie, I scored two nib piston kits, a nib conrod and nib crankshaft a couple years ago from a repair shop that went out of small engines, so I should be able to get several good years out of it (barring catastrophic crashes & we all know they rarely happen, right )

I have set it up as follows:
CH ignition with fixed timing at 28 degrees, CH magnet ring mounted to a little bit of the orig flywheel
Local friend made up the prop adapter
Walbro WT170 carb with custom micarta adapter manifold, original was mounted to a rubber flex mount, Ok in a chainsaw, but too floppy for aircraft use (hard to maintain a constant throttle setting)
Shop-made mount from 1/8" aluminum sheet
Shop-made muffler from electronic project box and copper pipe

Performance with reg gas, 40:1 husqvarna chainsaw oil - 17x8 APC @ 8400, 18x8 std Zinger@ 7100-7200 on the bench. I'm thinking it should do about 7500 with a 18x8 Zinger Pro. Easy to start, nice idle and very good throttle response.

All-up weight with mount, muffler, and ign is about 3lb-12oz, very respectable.
Attached Thumbnails
Click image for larger version

Name:	mcculloch_conversion_004_845.jpg
Views:	132
Size:	108.4 KB
ID:	24049   Click image for larger version

Name:	mcculloch_conversion_003_674.jpg
Views:	126
Size:	115.1 KB
ID:	24050   Click image for larger version

Name:	mcculloch_conversion_001_400.jpg
Views:	103
Size:	114.5 KB
ID:	24051  
Robin Boomsma
MAAC 46821
Hub City Radio Control Club
Saskatoon, SK
Sonic Boomer is offline   Quick reply to this message.

Sponsored Links - Subscribe to remove this ad.
Old 05-03-2007, 02:19 PM   #2
RCC Supreme Contributor
I am: John Davidson
Join Date: Feb 2003
Location: Vulcan,Alberta
Radio of choice:
EVO(12), Futaba
# of RCs: ?

Feedback: 0 / 0%
Posts: 2,927
Total Props: 0
Nice conversion. I did a Mac last year but it is still on magneto and that's going to change. I like your mount as it then gives you room for the exhaust. Will change mine to yours when I get some time. Most chainsaw engines are good for us as they are stronger constructed. At least they have bearings front and back with a full crank.
Have fun with it.
John Davidson
Keep the shiny side up and the wheels down
Vulcan1 is offline   Quick reply to this message.
Closed Thread

Quick Reply

Register Now

In order to be able to post messages on the RCCanada - Canada Radio Controlled Hobby Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionally, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Your Name
Your first name and last initial is required if you plan on using the forum.
Which city & province you live in. This is mandatory for classified listings.
Radio of choice?
Which radio is your current favorite to use?
Number of RC Vehicles?
How many boats, cars, planes do you own?


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
vBulletin Message

Thread Tools
Display Modes

Forum Jump

All times are GMT -5. The time now is 10:45 AM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.