Author Topic: Efco 962 vs Stihl 361  (Read 6185 times)

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Offline Old Iron Logging

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Re: Efco 962 vs Stihl 361
« Reply #10 on: March 19, 2011, 02:04:42 pm »
I don't think so. The 036 is supposed to have the milder porting. 361 and 962 are going to be a bit on the hot side if I understand correctly.

Offline Cut4fun

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Re: Efco 962 vs Stihl 361
« Reply #11 on: March 19, 2011, 02:50:18 pm »
 :o  Sweeeeeet   8)
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Offline Old Iron Logging

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Re: Efco 962 vs Stihl 361
« Reply #12 on: March 19, 2011, 03:07:04 pm »
My 962 is going to ride in my porter to cut out my work saws if I get jammed. May cut the occasional tree. Do a few GTG type events. Told Brian to go as far as he did with the 675 Solo.

Offline Old Iron Logging

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Re: Efco 962 vs Stihl 361
« Reply #13 on: March 19, 2011, 06:16:40 pm »
I sent Brian a Jon 625 piston as an option for the 962. Should let the intake be widened further than a stock piston.

Offline Timberwolf

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Re: Efco 962 vs Stihl 361
« Reply #14 on: March 21, 2011, 07:42:12 pm »
962 is apart, compression was good stock 170 psi, but squish was a huge 0.045 in. Bringing squish down to 0.020 should pusch compression up in the 200 psi range.

962 piston looks good, skirt width is just a little over 70% of bore so will be able to get fairly wide with ports. The Jonny 625 piston, though it is a nice piston won't work well as it blocks the lower transfers off, would need windows cut and a some carving in the base, also the ring end is getting very close to poping out into the intake.

962 overall looks good, castings and ports are nice, 1mm bore advantage over the 361, compression will be easy to get even without a pop-up though there is 0.140 above the top ring to work with. Lots of room for ports, combustion chamber is nicely shaped. Intake boot could be better.   

I'l have to get a new photobucket account to put some pics up.

Offline Timberwolf

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Re: Efco 962 vs Stihl 361
« Reply #15 on: March 21, 2011, 07:54:02 pm »
It looks like the 962 has more potential than either the 361 or 036 in the power department.

Offline Cut4fun .

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Re: Efco 962 vs Stihl 361
« Reply #16 on: March 21, 2011, 07:58:52 pm »
Brian, to embed youtube video's here, click share below video and copy and paste link.

Welcome and enjoy......... 8)
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Offline Old Iron Logging

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Re: Efco 962 vs Stihl 361
« Reply #17 on: March 21, 2011, 08:26:29 pm »
962 is apart, compression was good stock 170 psi, but squish was a huge 0.045 in. Bringing squish down to 0.020 should pusch compression up in the 200 psi range.

So a 156/162 jug on a 165 case should work fine if the rod length is the same. 1mm longer stroke on 165 should tighten up the squish.

Offline Timberwolf

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Re: Efco 962 vs Stihl 361
« Reply #18 on: March 24, 2011, 07:27:31 pm »
Work has had me busy last few days, but did some work on 962 tonight.

Port durrations stock
E 156.8
T 113.8
I 148.6

I don't thing I want to make any big changes on durrations maybe a few degrees more on transfers, a couple on the exhaust and widening out the exhaust should give enough blowdown area. Intake I think just widening and durration increased what ever lowering the jug 0.025 will add.

 

Offline Timberwolf

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Re: Efco 962 vs Stihl 361
« Reply #19 on: March 24, 2011, 07:57:56 pm »
http://s1135.photobucket.com/albums/m633/4saw/

Here are a few 962 pics, lower transfer problem can bee seen with the Jonsred full circle piston.

 

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