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March 25th, 2016, 10:11 AM   #41
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Originally Posted by bergmann View Post
Stupid question. Will these fit in the 644 motor or just the 628's?
if the wrist pin is the same diameter, I can't see why not. I believe the only difference is in the rod length and big end diameter (smaller). But I think the lil end is the same. However you should check the manual, and with Bushy, Dr. C, Spanner or Taffy to confirm as I have never had a 644 motor.
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March 26th, 2016, 01:43 AM   #42
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I doubt that the bottom end of a 644 could take the 105mm piston without the compression coming right down. it only has a 32mm big end and the 628s have a 35mm big end. I'd get a 2005-2008 crank AND do this - yes. but not on the OEM crank.

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Last edited by Taffy; March 26th, 2016 at 01:45 AM.
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March 26th, 2016, 06:12 AM   #43
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It has been done 105 x 82 with the old crank. But not my me and not for 360 hours lol

Contiman and others have done it. Not with standard mains. Some used 22206 spherical rollers others a 20mm wide nj2206 on the drive side

And not with this piston ! The jbs pistons are not as tall

The actual question is: weather this particular piston actually fits in a 644 with it's 24.5mm height?

for the 80mm stroke with a rod length of 136.1 to 136.2mm and the piston at 24.5 the top of the piston is level with the cases.

According to this site The 644 had 2 lengths of rod 134 and 135mm and an 82mm stroke so you can figure it Should work for the 134mm rod with a very large squish about 2mm . So yes it fits But!

With the 135 mm rod squish will be nicer (same as with the 80mm crank) but Compression will be very high look out

Last edited by bushmechanic; April 20th, 2016 at 12:11 AM.
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March 26th, 2016, 05:20 PM   #44
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Thanks for the info guys
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March 30th, 2016, 08:39 AM   #45
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Update: Just got off phone with Al. Build sheet is progressing and should be completed by end of week. He stated there may be some questions. I will apprise as I hear back. Moving forward
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April 8th, 2016, 04:02 PM   #46
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No word yet. I plan to follow up on Tuesday. I'm slammed Monday but I think I have Tuesday off.
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April 8th, 2016, 11:20 PM   #47
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I will be opening up my 644 engine soon for routine inspection, I will measure the piston, but, as stated by others earlier in the thread, I'm sure this 105 piston wont work on the 644 without modification. I'm guessing the 105 piston is going to be about 1.5mm above the liner. Maybe I've got it backwards, but according to the Wossner spec, the 644 piston deck height is 23mm, assuming that piston is level with the liner, putting a (6224.5mm piston on the 644 crank will have the piston above the liner?
This is just speculating though, I will check this out soon...
Either machining the piston down if possible, or getting a shorter conrod could make it work...

Goose, how many of the batch pistons have been allocated?
And are you having them make 105mm head gaskets as well, or getting them somewhere else?
Thanks from canolman
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April 13th, 2016, 11:15 AM   #48
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Left a message and a follow up email too . . . no response yet, but I just sent it so stay tuned (meant to do so yesterday but it was too late by the time I got to that part of my "to do" list - and it was in the priority section of the list - kinda goes to show ya how long that list is!). Will apprise when I hear back . . .
Thanks from bushmechanic, WArdogG and tourist

Last edited by Goose916; April 13th, 2016 at 11:16 AM. Reason: too little coffee
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April 13th, 2016, 05:16 PM   #49
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Hi wardog

As I wrote it will fit in the 644 the 23mm high pistons don't come up to the top

You have a 135 and a 134mm rod most are 135 and you have a 41 mm throw on the crank

Same as an 80mm stroke crank (40mm throw) with 136mm rod

The issue is rather compression which will be high

Fwiw head volume in approximately 38cc you can figure the rest
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April 15th, 2016, 03:34 PM   #50
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And for the win (be advised, I requested valve pockets for size 37/32 valves). I didn't receive any response to uncut tops and will follow up with that for Spanner and anyone else who wants one. Minimum Order is 12. I'll speak for 4 of the 12. I'd like to order in 2 weeks (after paying taxes and hopefully getting some accounts receivable in - and organizing 1) receipt of payment from those interested; 2) the payment to Wiseco - custom so it's up front in total); 3) shipping to all those who buy piston(s). Without further hubbub:

"Kevin, Cost per piston without skirt coating for a 12 piston order will be $120.82. With skirt coating price per piston will be $134.82.

Thanks,

Alan Pizzino
Technical Sales
Wiseco Performance Products
440-497-3105
7201 Industrial Park Blvd
Mentor OH 44060
440-497-3105 (direct line)
800-321-1364 (general line)
440-951-6606 (fax)"

Please post up your interest and whether you are committed to purchase (ie., money in hand). I'll see what I can do to grab a few extras for those who may be interested but short on dosh (slang for money). I'll start a new thread it is easy to figure out who wants what. In the meantime . . . Yay! So, who is in charge of the custom liner order so I can get on board with that too?
Thanks from bushmechanic and Idle
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