Turning A Stihl 038 Into A Ported 038 Magnum

Arborist Forum

Help Support Arborist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Mastermind

Mastermind

Work Saw Specialist
Joined
Nov 21, 2009
Messages
36,449
Location
Tennessee
Here's a really nice 038. It's an early magnesium tank, non brake, point ignition saw. I've never seen a better looking example.

LeesStihl038001.jpg


LeesStihl038003.jpg


All OEM parts for this build. The owner is a Stihl tech, and has done a fine job on bringing the saw this far.

LeesStihl038002.jpg


In order to fit the jug on this case the bolt holes must be slotted inward a bit.....

LeesStihl038007.jpg


And the case has to be clearanced for the piston skirt.

Normally I would split the case to do this step but the case gasket, seals, and bearings are in excellent condition so I taped it up and covered the area I'm working in with grease to hold any chips. Then I used a vacuum to clean it up before I removed the tape and grease.

LeesStihl038008.jpg


This is where I gave up for the night........more tomorrow. :)
 
bcorradi

bcorradi

Arboristsite.com Sponsor
Joined
Jan 18, 2004
Messages
4,328
Location
Lake Park, MN
That is a very nice looking 038 AV. I'm suprised it has the newer gas and oil caps on it unless they changed them. Looks like it will be an interesting thread.
 
fastLeo151

fastLeo151

Addicted to ArboristSite
Joined
Nov 20, 2011
Messages
1,848
Location
North east Ohio
I thought I had a mint 038, that thing is very clean. When converting a regular 038 to a mag will the converted saw run the same as a factory mag? I'm thinking about case differences.
 
Mastermind

Mastermind

Work Saw Specialist
Joined
Nov 21, 2009
Messages
36,449
Location
Tennessee
you lazy bum.

btw
i heard you ported this saw.
[video=youtube_share;fdwC4vhc594]http://youtu.be/fdwC4vhc594[/video]

Yeah.......when I was 10 years old......that was back when I was still using a cold chisel and a horse shoe rasp........looks like Ol' Chuck dulled the dang chain......bastard! :msp_sad:

I thought I had a mint 038, that thing is very clean. When converting a regular 038 to a mag will the converted saw run the same as a factory mag? I'm thinking about case differences.

Good question......we shall see. :msp_wink:
 
Mad Professor
Joined
Jul 2, 2007
Messages
18,246
Location
North East USA
I never had to mess with the case , on 038S to mag conversions. Factory mentions a need for this on 038 to 038S conversions, they have a template

You will find even a dual port 038S mufflers is in need of width.

Plan a on a Bing or a Tilly?

I'm interested to see what happens with the ports.

This conversion has been done with OEM and TECOMEC by me, the latter works fine too
 
Mad Professor
Joined
Jul 2, 2007
Messages
18,246
Location
North East USA
I thought I had a mint 038, that thing is very clean. When converting a regular 038 to a mag will the converted saw run the same as a factory mag? I'm thinking about case differences.

The 038S conversions I've done are strong/stronger than My 038 Mag, but they had some tweaks and the Mag is OEM.

Internals are mint on the Mag, , factory piston with OEM machine marks, so a good comparision.

Oh yes a Bing or a Tilly from a 038S run the same. Don't use a 038 tilly as it is smaller
 
Mastermind

Mastermind

Work Saw Specialist
Joined
Nov 21, 2009
Messages
36,449
Location
Tennessee
I never had to mess with the case , on 038S to mag conversions. Factory mentions a need for this on 038 to 038S conversions, they have a template

You will find even a dual port 038S mufflers is in need of width.

Plan a on a Bing or a Tilly?

I'm interested to see what happens with the ports.

This conversion has been done with OEM and TECOMEC by me, the latter works fine too

I only have the 038 Tilly.....I need the Mag carb...Bing or Tilly.

Very cool MMind!!! I have an 038 super electronic that I just went thru, runs very well but... could be up-graded???

Upgrades......I like upgrade almost as much as I like pie. :msp_biggrin:
 
Mad Professor
Joined
Jul 2, 2007
Messages
18,246
Location
North East USA
I only have the 038 Tilly.....I need the Mag carb...Bing or Tilly.



Upgrades......I like upgrade almost as much as I like pie. :msp_biggrin:

Mastermid,

038S Tilly and the Bing have same size venturi.

The last conversion I did , either carb ran best at 1 1/4 out, slight MM, polished Ex port

Parts are way cheaper for the Tilly.


EDIT : MM early Tillys were smaller, you want a SUPER Tilly or BING

Let me know what you do to the ports, I was very mild in my conversions.

Thanks!

Forgot, about !000' elevation, 100LL and Golden spectro 50: 1
 
Last edited:
Top