• Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

  • 2 Stroke Husqvarna Motorcycles Made In Austria - About 2014 & Newer
     TE = 2st Enduro & TC = 2st Cross

TE/TC All About Setting the Squish Clearance

After. I forgot to test before. Yes 1.3mm (0.050") is still pretty big but seems to be an accepted setting for the 300. I will test and then likely go more. I have snow so testing is curtailed for a few months. Cam.
 
We have found the squish clearance to NOT be the dominant force in having a better performing engine.

We have designed and tested hundreds of different chamber designs using the SAME squish design and changing only the chamber geometry. The HP changes and how it effects the power-band width was staggering.

While having excessive squish clearance is usually not a good thing, to state that is makes up 75% of the benefits is not inline with our testing results (and we have tested ALOT).

Also to state that spooge is related to squish would also be against what we have found.

Great topic.. but what Bell (who is a genious) determined using a 1970 air cooled engine (any cc) or what Blair determined at QUB using 50cc test platforms is relative in theory and much of it is applicable. Those guys (and others) were 2 stroke pioneers and without their R&D, the 2 stroke would surely be less advanced than it is today. BUT..having said that, those test beds sparsley resemble anything we are running today and so the data should be taken with that in mind.
 
Hey guys I tried doing a squish test on my bike with 1.6mm solder, it hasnt squished it one bit, seems way off. I have a pretty nasty low rpm ping i have been trying to get rid of for a while now. I put solder L's off to both left and right sides of the piston (over the pin basically) and not to the front of rear so I know its where it needs to be. I was wondering if I wasnt getting it in the actual combustion chamber but moved the solder up and down while turning over the engine to make sure I was actually hitting the piston. This seems like a crazy amount of squish for a TE150. I also did a compression test while i was at it- Im at 160 after 4 different tests with 56hrs on original top end. Any ideas?
 
hakkalugi said:
Hey guys I tried doing a squish test on my bike with 1.6mm solder, it hasnt squished it one bit, seems way off. I have a pretty nasty low rpm ping i have been trying to get rid of for a while now. I put solder L's off to both left and right sides of the piston (over the pin basically) and not to the front of rear so I know its where it needs to be. I was wondering if I wasnt getting it in the actual combustion chamber but moved the solder up and down while turning over the engine to make sure I was actually hitting the piston. This seems like a crazy amount of squish for a TE150. I also did a compression test while i was at it- Im at 160 after 4 different tests with 56hrs on original top end. Any ideas?
Click to expand...

Use thicker solder and then at least you know where it's at and you can also see the squish profile so you can machine it right. 160 psi is low for a race 150.
 
lankydoug said:
Use thicker solder and then at least you know where it's at and you can also see the squish profile so you can machine it right. 160 psi is low for a race 150.
Click to expand...


Does anyone know what the stock base gasket thickness is before I start machining maybe I can just go to a shorter gasket? I will try to get my hands on thicker solder for a proper measurement.

Time for rings or should I think about a full top end? Whats the stock compression for a 150?
 
hakkalugi said:
Does anyone know what the stock base gasket thickness is before I start machining maybe I can just go to a shorter gasket? I will try to get my hands on thicker solder for a proper measurement.

Time for rings or should I think about a full top end? Whats the stock compression for a 150?
Click to expand...


I got about .025 thickness on the base gaskets on my 150 to set the correct piston height of .004 below the cylinder.

On the stock head the squish band is about .049 deep when you add the X distance it’s over .05


I’m getting 178 to 185 psi on my setup but I’m not running stock.
 
Hey lugi,
You might as well pull the head and verify your solder placement... sounds like you're gonna want to fix whatever number you come up with. While you're in there you can also verify your X dimension and determine if a base gasket change would move you in the right direction. And if you choose to move the cylinder up or down you'd want to do that before you machine the head. Ya, I know... DUH... but I had to say it.
 
Testing has proved out well. Running 94 oct with 40:1 971 then 60:1 k2. At 35c temp 3000' no sign of detonation or anything odd. Very happy with the results. Cam
 
John Bunker said:
I got about .025 thickness on the base gaskets on my 150 to set the correct piston height of .004 below the cylinder.

On the stock head the squish band is about .049 deep when you add the X distance it’s over .05

I’m getting 178 to 185 psi on my setup but I’m not running stock.
Click to expand...


Just pulled my cylinder for a little voodoo. Here's what I found, stock 18 150xcw:
Two base gaskets: One 0.2mm, one 0.4mm
Piston .003 ABOVE the cylinder.
Stock squish .048" via solder.
Stock e-start compression 170psi at sea level.

I've since moved on to other head designs, but this was all with the stock settings.
 
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