Lotus Elan

piston sizes

PostPost by: dgym » Wed Jun 05, 2019 11:19 pm

hello guys,
I'm trying to get as much info as i can during rebuild of my twin cam and am struggling to identify my pistons.
they are AE branded. the numbers inside read:
20343B
DE 2
AE..
92
G1

no markings as to std or +anything.

ive measured them with the micrometer across the gudgeon pin level at 83.42mm (3.284")

still trying to figure it out but seems that should be around +. 030?

i cant seem to find any useful internet info about part numbers, even having found an old AE- NURAL interchange reference.

please tell me anything you know boys!
-Jim
36/6612
1967 S3 Coupe (left the factory in 66)
original rego PPC 8E
original owner B.M. Wetherill ..are you out there?
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PostPost by: Chrispy » Thu Jun 06, 2019 2:03 am

I had AE pistons in mine. There was some more useful info stamped on the crown. Anything on yours? Cleaned the carbon off it yet?
Chris
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Exige S2 Supercharged
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PostPost by: dgym » Thu Jun 06, 2019 2:08 am

nope, crown is clean and all i have is a hand scribed arrow.
I wonder if they have been machined perhaps.
36/6612
1967 S3 Coupe (left the factory in 66)
original rego PPC 8E
original owner B.M. Wetherill ..are you out there?
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Location: Melbourne, Australia

PostPost by: promotor » Thu Jun 06, 2019 6:24 am

dgym wrote:hello guys,
I'm trying to get as much info as i can during rebuild of my twin cam and am struggling to identify my pistons.
they are AE branded. the numbers inside read:
20343B
DE 2
AE..
92
G1

no markings as to std or +anything.

ive measured them with the micrometer across the gudgeon pin level at 83.42mm (3.284")

still trying to figure it out but seems that should be around +. 030?

i cant seem to find any useful internet info about part numbers, even having found an old AE- NURAL interchange reference.

please tell me anything you know boys!
-Jim


If you were to add piston to bore clearance of 0.003" that would give you a bore size of 3.287" which is closer to +040" (3.290") than it is to +030" (3.280").
What is the biggest measurement you get on the skirts regardless of how high or low on the skirt you measure?

I can't help with clearly identifying the piston numbers other than saying it's not the "usual" Lotus piston numbers I've seen here in the UK.
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PostPost by: 2cams70 » Thu Jun 06, 2019 8:34 am

Can you post a picture?
1970 Ford Escort Twin Cam
1972 Ford Escort GT1600 Twin Cam
1980 Ford Escort 2.0 Ghia
Peugeot 505 GTI Wagons (5spdx1) (Autox1)
2015 Honda City 5spd.
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