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   Author  Topic: 292 re-visit  (Read 2423 times)
Bones
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292 re-visit
« on: December 23, 2012, 08:34:12 AM »
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I know over the last few years I have made a fair few posts as to what I thought the differences were in the 292 engine. As some of you may recall a few months back I made a correction to what I had posted many times. Due to the recent grenading of a 292 engine which I have taken apart, now I have a sample of all the 292 jugs I have.
Here is a few pics & thoughts about them.
Top of `71/72 crank case, note the transfer area more toward the exhaust side. ( note did not take pic of `70 case ). The `70 case has the transfers about centered from intake to exhaust.



3 different cylinders. On left is `72, middle is `71, right is `70. Note on left one the transfer area is more toward the exhaust ( kinda` matches the 72 case ).
Middle one is interesting, the transfer area is more positioned like a `70 jug but the material around the transfer is very thick, thus this jug base will fit and seal on any of the `70 to `72 crank cases.



Pics of exhaust port, again left `72, mid `71, right 70
72 & 71 same, 70 diff.



Intake ports, `72 on left, 71 - mid, `70 right.
`70 & 71 are same, `72 is diff.



`71/72 piston on left, `70 piston on right



`71/72 head on left, `70 head on right.
The `70 head has a smaller volume, it is visable that the built up part travels more toward the plug hole side on the `70 but it is also thicker ( closer to piston ).

With out having the sleeves out of the jug it is about impossible to tell but it actually looks like all the sleeves are actually same regardless of year.
I have made all references to a `70 part, in fact those parts are also exact same as the `69 SS parts.
Bones



« Last Edit: December 23, 2012, 08:52:33 AM by Bones » Report to moderator Logged
Bones
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Re:292 re-visit
« Reply #1 on: February 1, 2013, 09:24:14 PM »
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A few more pics that can be use full for 292s.
On left 71/72 - 292 piston, mid / left 69/70 - 292 piston, mid right 300 sport kit piston, right 70 - 640 Blizzard piston. Pic quality not too good, phone pics.



On left 69/70 - 292 piston, on right 300 sport kit piston.



On left 69/70 - 292, on righ 300 sport kit



On left 69/70 -292, on right 640 Blizzard.



On left 71/72 - 292 piston, in mid 69/70 - 292 & 300 sport, ( they are really both same heigth pic is decieving, on right 640 blizz piston




Bones
« Last Edit: February 1, 2013, 09:26:44 PM by Bones » Report to moderator Logged
VSDPS
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Re:292 re-visit
« Reply #2 on: February 2, 2013, 05:39:53 AM »
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Very interesting and useful information. Thanks Bones!
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Re:292 re-visit
« Reply #3 on: February 2, 2013, 08:36:15 AM »
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Thanks Bones!  this is super information all in one spot with images to help.

My favorite 292 concoction to build is a 3/4" crank and case (easiest to find, but has to have big ports) '71 jug (biggest intake and exhaust) and a '70 head (highest compression) and a HD 83/98 (again easiest to find) and a way you go....

This combo is hard to beat.
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Re:292 re-visit
« Reply #4 on: February 2, 2013, 10:28:49 AM »
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Very useful information ... thanks!
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1970 Ski Doo TNT 292 Bogie (Project)
1974 Ski Doo Elan (Habs - custom)
skidog59
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Re:292 re-visit
« Reply #5 on: October 4, 2013, 08:56:27 PM »
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Bones i have a question.  i have a 70 292 blizzard engine that the guy before me bored it out for a .040 over piston.  (oly piston)  the piston i have has both ring positioning pins on the intake side of the piston where as the tnt/blizzard pistons have one dead center on the intake and one inbetween the exhaust and transfer ports.  Do all oly pistions have the positioning pins, one dead center and the other between the intake port and the transfer port? I hope that wasn't too confusing its hard to describe if you don't understand i will take some pictures.  I have some concerns about where the ring gap will end up on the lower ring.  Porting is the same on the 70 blizzard and the 292 tnts correct?
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skidog59
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Re:292 re-visit
« Reply #6 on: October 7, 2013, 04:55:15 PM »
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also is the sleeve from a '70 292 blizzard the same as one from a 292 tnt.  I have an extra 292 cylinder if i could take this sleeve out and put a standard bore one in it that would be great.
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Bones
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Re:292 re-visit
« Reply #7 on: October 7, 2013, 06:44:57 PM »
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Hi skidog59. Sorry didn`t see the post from Oct-4 til now.
Yes I am sure all Oly pistons have both ring locating pins on the intake side and the TnT / Blizzard pistons have them one on each side.
You indicate a Oly piston in a Blizz engine.....Maybe you have done some head/jug shaving The Oly piston has a lower dome than the Blizzard piston so with a stock head your compression will be down some what.
FYI; Find a `70 - 640 Wiseco piston at std, it is perfect for the 292 at 40 over  The 640 Blizz piston has the correct crown for the 292 Blizz. The 640 piston has centered transfer windows but they are so wide they will open up the 292 ports just fine 
As to sleeves, sorry can`t answer that.
FYI; The 320 Oly sleeve is the same OD as the 292 TnT sleeve, so maybe you could doo some thing with one of them if the port height is within range ?? I know a 320 sleeve will not work to make a 292 TnT sleeve as ports are too far out of range.
Bones
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skidog59
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Re:292 re-visit
« Reply #8 on: October 8, 2013, 05:38:12 PM »
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I did a little investigating of my own on 300 pistons and it looks like the old 300 sport kit pistions have the one locating pin on in between the exhaust and transfer port.  I'm not too worried about the compression, as this isn't for racing its just so it runs and drives.  I'm planning on trail riding this sled so maybe the lower compression will keep me safe.  Although with those huge fins it seems they run incredibly cool. i'll have to keep an eye out for a 640 blizzard piston.
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skidog59
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Re:292 re-visit
« Reply #9 on: October 10, 2013, 06:20:31 PM »
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picked up a 640 blizzard piston off of ebay hopefully it shows up in time  for this weekend
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Re:292 re-visit
« Reply #10 on: May 26, 2014, 05:32:34 AM »
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So I took my 70 292 engine apart just to check it out / clean it up and I found that its definitely 71 engine - thanks for the awesome info above Bones!  Inside I found it has a Wiseco piston which is in nice shape.  Has one L ring on top, and one normal one underneath and looks like a 70 ELKO style.  The numbers on the bottom side of the piston say R320 R640, and it measures about 75.8mm.  Is that a generic size for a 292, or was this bored out a little?
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skidog59
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Re:292 re-visit
« Reply #11 on: May 26, 2014, 06:57:08 AM »
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That has been bored out. Tars probably a 300 piston
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Vintagerider
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Re:292 re-visit
« Reply #12 on: July 11, 2015, 06:50:48 PM »
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So thanks to all the awesome info posted above, I have determined my swap meet 292 is a 70 with a 71 piston.
The head does not look right, it's slightly offset like a 335. Part number is 813 030.
Since the 292 heads are pretty tough to find, what can I substitute? Not really concerned with maximum output at this moment. Just something that doesn't hang over the side of the jug and look stupid.

Thanks.
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Poidy
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Re:292 re-visit
« Reply #13 on: September 3, 2015, 11:39:38 AM »
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Just curious, what is a restored 1970 292 with good clutch worth there, no exhaust though???

Just for my own curious mind? I can doo the CDN math
« Last Edit: September 3, 2015, 11:40:46 AM by Poidy » Report to moderator Logged

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j3greg
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Re:292 re-visit
« Reply #14 on: July 28, 2017, 02:34:52 PM »
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OH NO - Photo bucket has struck  !!

Need the  pictures  of the 292 cylinders / heads so I can tell what I have !!

The pictures were the  secret decoder ring !
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GaWajn
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Re:292 re-visit
« Reply #15 on: July 29, 2017, 03:08:12 AM »
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Hhmmm ... this issue might be a blessing in disguise.

If I may make a suggestion Bones, this might be a perfect time to take the information contained in this thread, then take the photos that you still have on your computer (or re-take some new ones), and combine everything into a Word document. This would make it nicely formated ... PERMANENT ... and it could be shared with a direct file link to download on the resource page. It could also be a PDF file, but it is usually easier to format the information working with a word processor.

Just a thought ...
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1970 Ski Doo TNT 292 Bogie (Project)
1974 Ski Doo Elan (Habs - custom)
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