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Author Topic: Crank and Piston identification.  (Read 888 times)

Offline PurplePeopleEater

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Crank and Piston identification.
« on: March 28, 2016, 01:55:59 pm »
Whats going on here? I have never seen this before. I wish I would have got better pics of the crank when it was out but I didn't. I might be green but I thought I would share and see what feedback brings. I have two other LT500 Cranks and have never seen this.

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Offline PurplePeopleEater

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Re: Crank and Piston identification.
« Reply #1 on: March 28, 2016, 02:01:42 pm »
The piston measures at 88mm and is about 3.5mm shorter from pin to top than stock. They had the Jug shaved a little to make up the difference.





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Offline Rainman56

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Re: Crank and Piston identification.
« Reply #2 on: March 28, 2016, 03:06:16 pm »
I can't say for sure but I'd guess that's the "tornado crank mod" but someone with more knowledge may chime in.If it is that I've heard is "snake oil" but like I said someone more in the know can tell ya for sure.
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Offline Q2W

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Re: Crank and Piston identification.
« Reply #3 on: March 28, 2016, 09:49:00 pm »
Fixed your links to show on the forums correctly.

Yea, that's the Turbo crank mod that Trinity Racing does.  Good news is that it doesnt hurt performance.

Looks like a piston mod maybe trinity does.  The window is a common mod.  They also take a little off the skirt.

Not sure about the numbers on top, possibly a really old Wiesco Pro-lite piston.
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Offline Rogue1970

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Re: Crank and Piston identification.
« Reply #4 on: March 28, 2016, 10:00:30 pm »
First time I've seen the Turbo crank.  Heard about it, but never seen it.  Not sure if the picture is skewed but that piston window doesn't look symmetrical to the top of the piston.

Welcome to the site.
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Offline Glamisrider

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Re: Crank and Piston identification.
« Reply #5 on: March 29, 2016, 12:51:28 pm »
Looks like they used a different piston and modded the cylinder to work with it.

Need to verify some measurements:
1) Rod Length & part number (to ensure it's a stock rod):
2) Cylinder deck height from base surface to head surface
3) Pictures of the head

With these 3 measurements you should be able to tell what's been changed and adjust as needed.  If the cylinder has been cut down to run this shorter piston and you want to run a real LT500 piston you may be able to put a base plate in it to compensate depending on what the measurements are.

Pictures always help diagnose the issues too.



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Offline PurplePeopleEater

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Re: Crank and Piston identification.
« Reply #6 on: March 29, 2016, 01:51:55 pm »
I will get some more pics when I get home tomorrow and post. I do know (but no measurements) the rod is the same. Same part numbers etc. I am using that crank in the PurplePeopleEater right now. I needed a crank short notice and it was true and had been welded. The bottom of the cylinder has been shaved down and the sleeve has a little different cut than stock. The piston says std but deft from something else. It is apx 3mm shorter from pin to top. Head is cut with large squish and shallow in my opinion. Port job has the bridge or whatever you call it completely cut out. I will post some more pics and measurements tomorrow.
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Offline Q2W

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Re: Crank and Piston identification.
« Reply #7 on: March 30, 2016, 09:23:50 am »
having the bridge completely cut out is common in Q spec HRD setups.  Not all, depending on who did the actual porting, but most.

What was the squish set to?
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Offline PurplePeopleEater

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Re: Crank and Piston identification.
« Reply #8 on: March 30, 2016, 12:57:36 pm »
trying to figure out a better way to insert photos.
I am not a computer wiz
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Offline PurplePeopleEater

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Re: Crank and Piston identification.
« Reply #9 on: March 30, 2016, 01:09:10 pm »
<a href="http://s1136.photobucket.com/user/zk_ek/media/IMG_3827.jpg.html" target="_blank"><img src="http://i1136.photobucket.com/albums/n493/zk_ek/IMG_3827.jpg" border="0" alt=" photo IMG_3827.jpg"/>[/url]<a href="http://s1136.photobucket.com/user/zk_ek/media/IMG_3828.jpg.html" target="_blank"><img src="http://i1136.photobucket.com/albums/n493/zk_ek/IMG_3828.jpg" border="0" alt=" photo IMG_3828.jpg"/>[/url]<a href="http://s1136.photobucket.com/user/zk_ek/media/IMG_3829.jpg.html" target="_blank"><img src="http://i1136.photobucket.com/albums/n493/zk_ek/IMG_3829.jpg" border="0" alt=" photo IMG_3829.jpg"/>[/url]<a href="http://s1136.photobucket.com/user/zk_ek/media/IMG_3830.jpg.html" target="_blank"><img src="http://i1136.photobucket.com/albums/n493/zk_ek/IMG_3830.jpg" border="0" alt=" photo IMG_3830.jpg"/>[/url]


Base of cylinder to top is 137.5mm

Please excuse my computer illiteracy I do not know how to make the photos appear on page.
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Offline ZillaFreak

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Re: Crank and Piston identification.
« Reply #10 on: March 30, 2016, 01:35:13 pm »






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Offline Q2W

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Re: Crank and Piston identification.
« Reply #11 on: March 30, 2016, 04:13:49 pm »
dont use the HTML code.  use the IMG code instead.
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Offline PurplePeopleEater

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Re: Crank and Piston identification.
« Reply #12 on: March 30, 2016, 05:09:02 pm »
I do not know what the squish was. I bought it disassembled. To run this jug I either need a 4mm spacer? Or find out what kind of piston. Maybe a kx500 or cr500 piston? Something 500cc with an 82mm stroke?
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Offline Glamisrider

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Re: Crank and Piston identification.
« Reply #13 on: March 30, 2016, 06:48:28 pm »
Carl or Jerry will need to chime in and tell you what the spacer plate you need to run will be. 

Then you'll need to figure out what the head clearance will be with your gasket & spacer stack.

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