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Weigh your pistons.
Posted by Mitchman2
Topic Creator (OP)
Dec 13, 2017 08:36 AM
Joined 9 years ago
3,100 Posts
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I'm helping a buddy rebuild his TD engine. He's gotten a new set of Aerolite pistons from Moss... Should be a matched set, right?
In grams: 390, 393, 398, 399. This is not even close. You cannot shave 9 grams (the weight of 2 quarters) off of the heaviest piston(s). He's sending them back.
Always weigh your pistons. They should be within a half gram out of the box. Some builders will demand under a tenth of a gram difference.
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'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS
In grams: 390, 393, 398, 399. This is not even close. You cannot shave 9 grams (the weight of 2 quarters) off of the heaviest piston(s). He's sending them back.
Always weigh your pistons. They should be within a half gram out of the box. Some builders will demand under a tenth of a gram difference.
The Flat Earth Society has members from all corners of the globe.
'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS
Aridgerunner
Bill Bussler
Montoursville, PA, USA
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Dec 13, 2017 04:30 PM
Top Contributor
Joined 10 years ago
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Topic Creator (OP)
Dec 13, 2017 05:29 PM
Joined 9 years ago
3,100 Posts
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I did. the shop said the rods are perfect. The pistons don't have a lot of meat on them. Easier to get a set properly matched out of the box.
The second set arrived - all within 1 gram.
The Flat Earth Society has members from all corners of the globe.
'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS
The second set arrived - all within 1 gram.
The Flat Earth Society has members from all corners of the globe.
'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS
Topic Creator (OP)
Dec 14, 2017 12:49 PM
Joined 9 years ago
3,100 Posts
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In reply to # 3645095 by riley1489
did you weigh or swap the gudgeon pins about?
B
In reply to # 3645063 by Mitchman2
The pistons don't have a lot of meat on them.
did you weigh or swap the gudgeon pins about?
B
With, of course, just as you weight the connecting rods with their hardware.
The Flat Earth Society has members from all corners of the globe.
'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS
Dec 14, 2017 01:23 PM
Top Contributor
Joined 12 years ago
26,297 Posts
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In reply to # 3645440 by Mitchman2
With, of course, just as you weight the connecting rods with their hardware.
I was not questioning your abilities. and yes measured with respective hardware of course. I always measure things, rods end to end etc.
I was asking were you able to weigh the gudgeon pins? was there a difference between them? and would swapping them about have helped?
I recognize this a moot question as all is now well with the replacements.
B
Life's most persistent and urgent question is, "What are you doing for others?"
Topic Creator (OP)
Dec 14, 2017 04:10 PM
Joined 9 years ago
3,100 Posts
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In reply to # 3645461 by riley1489
I was not questioning your abilities. and yes measured with respective hardware of course. I always measure things, rods end to end etc.
I was asking were you able to weigh the gudgeon pins? was there a difference between them? and would swapping them about have helped?
I recognize this a moot question as all is now well with the replacements.
B
In reply to # 3645440 by Mitchman2
With, of course, just as you weight the connecting rods with their hardware.
I was not questioning your abilities. and yes measured with respective hardware of course. I always measure things, rods end to end etc.
I was asking were you able to weigh the gudgeon pins? was there a difference between them? and would swapping them about have helped?
I recognize this a moot question as all is now well with the replacements.
B
Quite honestly it never occurred to me to swap the pins around.
The Flat Earth Society has members from all corners of the globe.
'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS
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