Piston Identification
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Topic author - Posts: 353
- Joined: Sun Jan 06, 2019 4:15 pm
- First Name: Nikolaus
- Last Name: Martin
- Location: Kansas City
- MTFCA Number: 32342
- MTFCI Number: 23512
Piston Identification
Can anyone identify these aluminum pistons from the photos without me pulling the head? They say "Model T-HC" on the inside of the skirt. Does the HC mean high compression, or is it just a coincidence in model number?
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- Posts: 4967
- 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 Identification
Put the piston at TDC and look thru the spark plug hole, if the top is domed they are HC, if flat normal. Understanding that T pistons come up out of the hole not even across like others.
I know the voices aren't real but damn they have some good ideas!
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
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Re: Piston Identification
I expect it stands for high compression but can't tell by these photos. On stock pistons the outer edge for about 5/'8" has an upward bevel and then the rest of the top is flat. Most high compression pistons have an even curved top surface, kind of a low dome.
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- First Name: George
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Re: Piston Identification
It's the initials of the manufacturer.......Hang Chow, a well respected recycler of old beer cans in China.........
Of course I'm kidding. They're almost surely high compression.
Of course I'm kidding. They're almost surely high compression.
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Re: Piston Identification
Those wrist pin bolts should be safety wired, the cotter pins will not do anything to keep the bolts from working loose.
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- Posts: 4967
- 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 Identification
Cotter pins are correct in this location. BUT;
http://www.mtfca.com/discus/messages/80 ... 1249525321
http://www.mtfca.com/discus/messages/33 ... 1380816823
http://www.mtfca.com/discus/messages/80 ... 1249525321
http://www.mtfca.com/discus/messages/33 ... 1380816823
I know the voices aren't real but damn they have some good ideas!
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
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- First Name: Dave
- Last Name: Hanlon
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Re: Piston Identification
Yes, cotter pins work, but not bent that way.
Needs turned 90* and only one leg bent.
Needs turned 90* and only one leg bent.
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Re: Piston Identification
In regards to cotter pins there;
In my opinion NO!! Remove them and the bolts, apply Loktite and torque the bolts to 30 ft lbs!!
In my opinion NO!! Remove them and the bolts, apply Loktite and torque the bolts to 30 ft lbs!!
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Topic author - Posts: 353
- Joined: Sun Jan 06, 2019 4:15 pm
- First Name: Nikolaus
- Last Name: Martin
- Location: Kansas City
- MTFCA Number: 32342
- MTFCI Number: 23512
Re: Piston Identification
Thanks to all. Yes, they are domed as verified through the spark plug hole. I know it looks like the cotter pin will clear the rod and allow the bolt to turn in the photo, but it's actually long enough that it won't. I think the builder was of the opinion that using a long enough pin and bending both tails both prevented the bolt from backing out and halved the chances of the pin falling out. Thanks for the heads up, for sure, of course. If I'm reading your posts and the linked posts correctly, it's doing what it's supposed to do.
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Re: Piston Identification
15,000,000 Model T’s were built with cotter pins in the wrist pin bolts...