Poulan 3400,3700,3800, 4000 stroked crankshaft project. Part 2

[RI Chevy]

I really like the color. Very different.

 

[Red97]

I really like the color. Very different.

Well it's not a stihl/husqvarna lol

That color is pretty close to stock poulan green

 

[RI Chevy]

Cool

 

[Barneyrb]

Not a very productive day. The new supplied crankshaft bearings are caged. I'm disappointed. I clearly told that jackwagon I want full compliment. For those unfamiliar with this saw model, these saws use a needle crank bearings. Here's a pic of caged and full comp for comparison.
View attachment 46312
I did chase threads on the case halves and start mounting stuff.
Thanks to Tim/Fossil for helping me with some oil pump diaphragm material and support and advice on this project.
View attachment 46314
I learned something new today I didn't know about these saws. I haven't checked parts books to see if the is a s# break or what determines which plug any given saw would use. There seems to be early and late bore oil caps. I'm guessing early being smaller than late. As luck would have it, the random case half I used is for the small plug and I don't have any small plugs. A Briggs & Scrapiron oil cap kinda fits for now.View attachment 46313
I roughed out the carb mounting block.

View attachment 46317
I'm Hoping Adam will finish it. He has agreed to do the porting. Adam has been the brains behind this project. My contribution has been to make it bolt together. I know nothing of porting at this time. It is something I hope to learn.

Tim, I have never seen those bearing cause any problems, most way outlast the saw. Do make sure you order 2 new thrust washer for the crank as they are brass/bronze and do wear some. Part number 530015354 Thrust Washer- Crankshaft

 

[Wagnerwerks]

What Torrington number are the crank bearings?

 

[Nitehawk55]

Take cover , she's gonna blow !!

 

[dieselfitter]

What Torrington number are the crank bearings?

Torrington #BH108
I have 4 INA SCH-1010 bearings, new in the box. I'll use them elsewhere. I ordered some full comp Torringtons. They will arrive next week. There has been plenty of other stuff to do.
I opened up the muffler

Made throttle linkage

Did some more fitting of the covers. Not completely done but close.

 

[Wagnerwerks]

I have a nos pair here if you end up needing some.

 

[Dub11]

Looks like your paints getting all scratched up

 

[dieselfitter]

Randy, I've never seen a crank bearing failure either. I would regret seeing a failure that might have been prevented by using a full comp bearing.
One last pic.

I broke the cable on Adam's Foredom grinder. Will be ordering a replacement shortly. I also have a complete new grinder ordered, should arrive next week. I'll be replacing the head gasket and water pump on my 1999 Saturn wagon to pass the time until parts arrive.

 

[dieselfitter]

I have a nos pair here if you end up needing some.

Thanks for the offer. I'm good.

Looks like your paints getting all scratched up

The handle is an old spare with a chunk missing and cracks. If I get enough ambition, I may cobble together one good handle and paint it up.
Adam dropped off another 3400 he got from a friend that owed him money. It's in excellent shape, fresh meat for the grinder...

 

[Mastermind]

I love this build Tim.

 

[dieselfitter]

Poulanfitter 2100?

Poulcat 102. Lol Reference to the challenger hellcat

This is #1BMF! I'm gonna name it Poulanstien!

Poulanator?

did you measure case volume? 1.2 to 1 is supposed to be ideal

No Scott, I didn't give it that much thought. I'm curious what it would measure out to be.

Tim, I have never seen those bearing cause any problems, most way outlast the saw. Do make sure you order 2 new thrust washer for the crank as they are brass/bronze and do wear some. Part number 530015354 Thrust Washer- Crankshaft

The crankshaft is wider than stock and required the thrust washers to be flat sanded thinner for clearance. I'm guessing less than .005" endplay now.

 

[Dub11]

Poulanator sounds good or maybe Poulsaber? or Poulansaber?

 

[Barneyrb]

The crankshaft is wider than stock and required the thrust washers to be flat sanded thinner for clearance. I'm guessing less than .005" endplay now.

That should be fine, it should really be a good runner

 

[Magic_Man]

This is just great

 

[Deets066]

So where did this end up for stroke? Is it the same stroke as a stock 2100?

 

[Red97]

41 +/- ish mm stroke.

 

[dieselfitter]

.810" center to center on the throw, x 2 = 1.62"(41.1mm). The original stroke was 33.5mm. A 2100's stroke is 40mm.

 

[dieselfitter]

The bearings arrived late Friday. I got them installed today. The crankcase is sealed with anaerobic sealer. Got the flywheel indexed to crankshaft and timing set. I buggered the 2100 cylinder a few weeks back when trying to cut squish. I have another cylinder en route. When it arrives, I'll cut base and squish to fit it. I need to find a 084 carb to replace the one I'm borrowing from Adam. I need to chase down some other odds and ends. It won't be long now.