Author Topic: huztl cheat sheet  (Read 432 times)

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Offline weimedog

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Re: huztl cheat sheet
« Reply #20 on: October 19, 2015, 07:58:22 pm »
piston skirt on the piston that was installed on the complete engine was too long as best we could tell, we measured it against all the other types of 066 pistons and it was taller overall with the additional height being below the piston pin
I told Farmertec about the problem and I replaced those 6 cylinders with FT BB cylinder kits which Farmertec sent me free on my next order.
they are normally good to correct a problem but it made me nervous to use this kit at all
Dave

So how many revolutions did it take to figure there was interference? I haven't experienced their complete short blocks, just the individual parts. Do you have the measurements from the pistons the were too long? How about some of those derelict pistons? I would like to get one and turn it into a popup.. :) (I'll trim the skirts back too) How much difference was there from stock?

(The squish "out of the box" on the 56mm kits has been in the .028-.030 range on the ones I've built so far)

Offline weimedog

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Re: huztl cheat sheet
« Reply #21 on: October 19, 2015, 08:44:34 pm »
So I pulled 3 "white box" 54mm cylinder/pistons from Huztl out of their boxes, a "blue Box" Farmertec labeled 56mm kit from Huztl and a Mystery "White Box" 56mm from another Asian supplier.

All three 54mm pistons from Huztl were 1.69in long or approx. 43mm
The 56mm piston from Huztl was 1.61in long or approx. 41mm
The 56mm "Mystery" brand was also 1.61 although the cylinders obviously came from different molds & the pistons were of obviously different quality. The Huztl/Farmertec part has a much wider/larger cast area for the transfers. They also have symbols cast into the transfer area where the "mystery" white box special had no symbols and looks like they had corrective machining.. BUT it appears to be heavier by weight probably has more copper in the cast materials.

Meteor lists the length of their 660 pistons as 43mm, same as the measured lengths of the Huztl pistons I just measured.

The "skirt" thickness is interesting...all the 54mm skirts were in the .070in range while the 56mm was a solid .090in and exactly the same both sides.

Now I have no idea what the assembled short blocks have as I don't have one to dissect...so curious if you have a piston or two around.

My concern was actually the 56mm piston was too short with too much duration on the intake. They run strong but are harder for me to tune on the idle and low speed. I suspected the short skirt.

Offline aclarke

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Re: huztl cheat sheet
« Reply #22 on: October 19, 2015, 10:21:10 pm »
Because of the Taper in most ports the bigger you go on a stock cylinder the more duration you loose.  Do the big bore jugs have the same port timing?

Offline weimedog

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Re: huztl cheat sheet
« Reply #23 on: October 20, 2015, 07:15:58 am »
They aren't actually "bored" out stock/Huztl cylinders. They are a completely different casting from different molds & cores. I haven't put one on a degree wheel yet but I suspect they have different port timing from intake thru to exhaust. And combined with the shorter piston I suspect the timing is quite different. I don't know if the 56mm is a fresh design or random ... they run strong as delivered under load but I've had issues with the low speed/idle side. I suspect the intake has way too much duration for my liking. Where the 54mm use fuel at a rate consistent with a descent design, the 56mm is a bit of a hog. Maybe I'm just not used to 100cc saws.

I've got around 5 or 6 gallons of gas through these saws so far. Most through the 56mm

I have to wonder, on one of the 54mm builds, the metallic gasket interfered with the piston skirt on the first installation attempt. Took me a while to figure out what was going on. Wonder if something along those lines hurt the ones you had. At first I was thinking it was a misalignment of the cylinder bore to the case!

The other thing I found on one cylinder was a "burr" left in the combustion chamber from the tapping of the spark plug hole. That would have eventually come off and was enough to make a mess if it didn't go right out the exhaust

One thing I do know, I prefer to build my own for my work vs. trust non saw types to assemble those parts!

Offline Cat-Face Timber

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Re: huztl cheat sheet
« Reply #24 on: October 20, 2015, 11:07:09 am »
In your opinion will these AM part Companies make parts for more models?
I notice that more Stihl than Husky?
How about the newer X-Torq Carbed saws?

Thanks
MIGHTY HUSKY 235
BESTEST SAW EVER!

Offline aclarke

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Re: huztl cheat sheet
« Reply #25 on: October 20, 2015, 04:45:52 pm »
Doesn't seem like much though goes into the port arrangement/ timing on the BB cylinders..  short skirt may help with fitment into the case but, wouldn't it make sense to raise the intake floor and lower the exhaust if you were going to the trouble of making molds?

Offline DefinitiveDave

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Re: huztl cheat sheet
« Reply #26 on: October 20, 2015, 04:51:48 pm »
As demand rises the AM companies will make anything that will sell but it needs to be along the order of thousands of pieces per month to make it worthwhile.
I will look but I am pretty sure I threw away all the long skirt pistons that I had in both individual and short block form.  You only have to sell one piece of crap to **** off a good customer for life.
I think I have a pair of the BB 660 jugs  sitting around and probably some of the pistons still in boxes if somebody wants to experiment on them.
I have not seen anything on the 500 series huskys yet from the major AM manufacturers.

Weimdog if you need parts for research let me know, I am happy to help.

Dirty little secret, guess how the third tier Cylinder manufacturers make their molds?
Yep they buy them from other manufacturers when they are too worn to use.
Dave
seeking new in box 046, standard or arctic model



Ebay Store: http://stores.ebay.com/Chainsaw-Conservation-Components

Offline weimedog

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Re: huztl cheat sheet
« Reply #27 on: October 20, 2015, 08:47:32 pm »
Dirty little secret, guess how the third tier Cylinder manufacturers make their molds?
Yep they buy them from other manufacturers when they are too worn to use.
Dave

That would explain the "partsangle" and Wangou ones I bought to see if they were from the same place as Huztl's... they are from different molds. Probably as you say worn out from yet another mystery source... :)

Offline weimedog

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Offline weimedog

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Re: huztl cheat sheet
« Reply #29 on: November 25, 2015, 08:57:12 am »
Next project on the bench this week... no base gasket 54mm build with .020" popup and a muffler mod. Want to see if I can match the 56mm with simple mods. Also going to an OEM decomp. AND the pull starts had a minor issue on about half of them..:

A parts kit from "DefinitiveDave" helped and then making a simple mod to existing parts helped as well....a video documentation of pull start issue...
(Listen to that 56mm build idling happily in the back ground for those who doubt it can happen with the "short skirt"/intake duration/free port issues)

https://www.youtube.com/watch?v=0rwYRk24LeA

 

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