02-11-2016, 09:37 AM
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#1
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Rennzenn
Join Date: Feb 2005
Location: Virginia
Posts: 1,369
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connecting rods & piston measurements
Does anyone know the different measurements for the m96 connecting rods (2.5, 3.2, 3.4)
How about the piston wrist pin to top distances?
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Rennzenn
Jfro@rennzenn.com
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02-11-2016, 12:13 PM
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#2
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by j.fro
Does anyone know the different measurements for the m96 connecting rods (2.5, 3.2, 3.4)
How about the piston wrist pin to top distances?
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I think all m96 rods are the same except the shorter 3.6 rods.
Piston pin height was raised 3mm for for 3.4 & 3.2 crankshaft.
Piston pins are offset 0.8mm to intake side.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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02-11-2016, 12:23 PM
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#3
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by j.fro
Does anyone know the different measurements for the m96 connecting rods (2.5, 3.2, 3.4)
How about the piston wrist pin to top distances?
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I'll measure that soon.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
Last edited by BYprodriver; 02-11-2016 at 12:25 PM.
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02-11-2016, 02:04 PM
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#4
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by j.fro
Does anyone know the different measurements for the m96 connecting rods (2.5, 3.2, 3.4)
How about the piston wrist pin to top distances?
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Centerline of the pin to top of 3.2 piston is about 41mm. Hard to get exactly from centerl.
OE Rod weights vary mine were about 564 grams. LN's are 511.3 grams
OE piston's vary alot mine were about 506 grams. LN's 96mm's are 503.4 grams
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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02-12-2016, 05:57 AM
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#5
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Rennzenn
Join Date: Feb 2005
Location: Virginia
Posts: 1,369
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Thanks BPD!
Recently Mr. Raby has thrown us a crumb about a short stroke 3.6l beast. I'm wondering what combos might be possible without having to source really custom parts. To stay in F Prepared at 2500# the max displacement I can do is 3.4 litres. With a 72 mm stroke (that's a 2.5L crank), a 100 mm bore would yield right at 3.4. With the sort stoke and the right rods and flowing heads I'm guessing it would be a rev monster.
Any thoughts out there???
__________________
Rennzenn
Jfro@rennzenn.com
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02-12-2016, 06:56 AM
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#6
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by j.fro
Thanks BPD!
Recently Mr. Raby has thrown us a crumb about a short stroke 3.6l beast. I'm wondering what combos might be possible without having to source really custom parts. To stay in F Prepared at 2500# the max displacement I can do is 3.4 litres. With a 72 mm stroke (that's a 2.5L crank), a 100 mm bore would yield right at 3.4. With the sort stoke and the right rods and flowing heads I'm guessing it would be a rev monster.
Any thoughts out there???
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If you are talking M96 5-chain engine, the only "pratical" ($10,000) thing to do is install LN sleeves in a 3.2L to get 3.4-3.6L. Heads are the limiting factor for doing something they weren't designed to do. Valves are to small.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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02-12-2016, 07:45 AM
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#7
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Registered User
Join Date: May 2014
Location: S.California
Posts: 2,029
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"Piston pins are offset 0.8mm to intake side."
Very helpful piece of obscure but crucial info for a diy rebuilder.
Perfect example of why we need Jake's book "M96/97 -The Definitive Guide".
Imagine how many rebuilders missed that and assembled the engine assuming the wrist pin offset was zero?
Hopefully he will publish it?
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02-12-2016, 08:10 AM
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#8
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by Gelbster
"Piston pins are offset 0.8mm to intake side."
Very helpful piece of obscure but crucial info for a diy rebuilder.
Perfect example of why we need Jake's book "M96/97 -The Definitive Guide".
Imagine how many rebuilders missed that and assembled the engine assuming the wrist pin offset was zero?
Hopefully he will publish it?
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Valve reliefs in the pistons are more obvious. Most of what I put in my 1st post is in the Bentley manual.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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