Piston/Rod stuff(It has pics) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-27-2006, 09:48 AM   #11
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Quote:
Originally Posted by VigCS
Hmmm....dished pistons. Never knew that.
Yep the L36 had dished Pistons( pretty shallow ) But it still had a 9.4 : 1 compression ratio..

I'd bet if it was flat the L36 would have been in the 10.0 : 1 Range

The rods could actually be the same with the exception of a folating pin & Bushing, instead of the press fit on the L36 piston.... MMy thoughts are the same on the seies I'* as well

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Old 09-27-2006, 09:50 AM   #12
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Hey, what are the casting numbers on that L32? Maybe we could come up with a database on rods/piston casting and part numbers, and pics to go with them.

I have pics of my S1 L67 piston/rod if anyone is interested.
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Old 09-27-2006, 10:35 AM   #13
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Quote:
Originally Posted by sandrock
Hey, what are the casting numbers on that L32? Maybe we could come up with a database on rods/piston casting and part numbers, and pics to go with them.

I have pics of my S1 L67 piston/rod if anyone is interested.

L36 you mean? I do not see what it would hurt to have casting numbers available for those who wanted it. I like having access to those things, personally....
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Old 09-27-2006, 08:09 PM   #14
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Mods/Admins, could we move this to P&B so it doesn't get buried?

Very cool that you pulled the piston and rod out of that extra engine, Doug.

Are you guys thinking that the compression differences between the L36 and L67 are merely due to different pistons? I guess I was under the assumption that the rods were not the same length between L36 and L67. Mayhaps I was wrong.

Also, can you check the other rod bearings for grooves? I wonder if that'* normal or not.
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Old 09-27-2006, 08:22 PM   #15
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Quote:
Originally Posted by big_news_1
Mods/Admins, could we move this to P&B so it doesn't get buried?

Very cool that you pulled the piston and rod out of that extra engine, Doug.

Are you guys thinking that the compression differences between the L36 and L67 are merely due to different pistons? I guess I was under the assumption that the rods were not the same length between L36 and L67. Mayhaps I was wrong.

Also, can you check the other rod bearings for grooves? I wonder if that'* normal or not.
How about this.... I'll move it to Performance & Brainstorming... But we can disect the diffrences between the L67 Series I and 2, and the LN3, L27 and L36 rods...

I believe that the pistons in the L67 are of better quality as opposed to the L27 / L36, I believe that the L27 and L67 Series I uses the same length Rods, the L67 having a Floating wrist pin and the LN3 and L27 having a Pressed Pin.. Both of the L27 and LN3 as well as the L67 Series I all share a 8.5 : 1 compression, but there were varying Dish sizes iirc...

The L36 like the L27 also has a Pressed wrist pin, where the L67 has a floating pin... If memory serves the L67 should have the top ring a little bit lower than the top rin of the L36...

All of the info we gather here could be a great learning experience for all of us... I would love to see all of the diffrences between the Rod/ Piston assemblies ...

We can get more pics of the L67 Series I rods and Pistons if needed..

Moving to Performance and Brainstorming...

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Old 09-27-2006, 08:25 PM   #16
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Quote:
Originally Posted by sandrock
Hey, what are the casting numbers on that L32? Maybe we could come up with a database on rods/piston casting and part numbers, and pics to go with them.

I have pics of my S1 L67 piston/rod if anyone is interested.
Im interested!!
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Old 09-27-2006, 08:30 PM   #17
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Quote:
Originally Posted by BLACK94SSEi
Quote:
Originally Posted by sandrock
Hey, what are the casting numbers on that L32? Maybe we could come up with a database on rods/piston casting and part numbers, and pics to go with them.

I have pics of my S1 L67 piston/rod if anyone is interested.
Im interested!!
Yes Sandrock would be the Man for the Piston Rod pics... I have a few pics but we need better ones... As well as a Crank casting that seems to cross to the 91 LN3, 91-95 L27 and 91-95 L67... Casting 4737 or 737

Could be interesting info if we could get it all together... I will be watching this thread


Black Bird what is the casting number on that L36 Crank?

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Old 09-27-2006, 09:28 PM   #18
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L36 crank has a 2170 and an L6 cast into it. It is most certainly a cast iron crankshaft. Bull nosed crank throws are not in it'* favor, so I think it needs a knife edge job. That would certainly lighten it up. Pics available if someone wants them posted in this thread. The thrust bearing is located in the #2 main. A note to any who would be tearing these things apart. Mains #1, #2, and #3 all have 10mm (head) side bolts. The #4 main is just held by the main bolts.
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Old 09-27-2006, 09:30 PM   #19
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Doug, are you getting any good ideas based on what you've seen?
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Old 09-27-2006, 10:52 PM   #20
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Ok, here are the pics, uncompressed for scrutiny. The bottle is for size comparison...I am sure alot of you guys know how big those are

Just FYI, these are L67 Series 1.











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