piston clearance

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mel.k53
Posts: 14
Joined: Mon Jun 28, 2021 11:07 am
First Name: MELVIN
Last Name: king
* REQUIRED* Type and Year of Model Ts owned: 1915@1923 roadsters
Location: Portsmouth,VA

piston clearance

Post by mel.k53 » Sat Dec 04, 2021 1:46 pm

I just bought a set of pistons and it says 2 to 3 tho clearance, it seems tight to me ,what do you think for new pistons? MEL

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Mark Gregush
Posts: 4956
Joined: Sat Jan 05, 2019 1:57 pm
First Name: Mark
Last Name: Gregush
* REQUIRED* Type and Year of Model Ts owned: 1925 cutdown PU, 1920 Dodge touring, 1948 F2 Ford flat head 6 pickup 3 speed
Location: Portland Or
MTFCA Number: 52564
Board Member Since: 1999

Re: piston clearance

Post by Mark Gregush » Sat Dec 04, 2021 2:24 pm

Mine .004 to .005, but I usually go with the .005. That puts it in the .001 per inch of diameter.
I know the voices aren't real but damn they have some good ideas! :shock:

1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup

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Sean Butler
Posts: 145
Joined: Sun Jan 06, 2019 12:22 pm
First Name: Sean
Last Name: Butler
* REQUIRED* Type and Year of Model Ts owned: 1911 Touring
Location: Huntington Beach, CA
MTFCA Number: 31557

Re: piston clearance

Post by Sean Butler » Sat Dec 04, 2021 2:39 pm

Mark's got it.
Sean Butler
Huntington Beach, CA


Norman Kling
Posts: 4071
Joined: Tue Jan 08, 2019 1:39 pm
First Name: Norman
Last Name: Kling
Location: Alpine California

Re: piston clearance

Post by Norman Kling » Sat Dec 04, 2021 3:45 pm

What Mark says if the pistons are aluminum. If steel they can be a bit tighter.
Norm


J and M Machine
Posts: 96
Joined: Wed Jan 09, 2019 6:46 pm
First Name: John
Last Name: Gulbankian
Location: Massachusetts
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Re: piston clearance

Post by J and M Machine » Sat Dec 04, 2021 6:10 pm

mel.k53 wrote:
Sat Dec 04, 2021 1:46 pm
I just bought a set of pistons and it says 2 to 3 tho clearance, it seems tight to me ,what do you think for new pistons? MEL
It depends on condition of the block: We thermal clean the engines so they get the heat transfer. We set our cylinders to their recommended 3 thousandths clearance and have never had and issue.

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