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bdub475
Samba Member
Joined: April 05, 2009
Posts: 577
Location: Los Lunas, New Mexico
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 Posted: Sun Aug 10, 2014 3:13 pm Post subject: 40hp wrist pin height |
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Does anyone know the pin height on stock 40hp pistons? I'm trying to figure out what the distance from main center to the top of the piston.
Half stroke 32mm + Rod length 130mm + Pin height ?
I plan to build a 40hp stroker using a 69mm crank and modified 40hp rods. I'm trying to find 77mm or 83mm pistons with the correct pin size and height to keep the engine close to stock width. |
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avus
Samba Member
Joined: November 11, 2005
Posts: 268
Location: Drain, Oregon
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| Posted: Mon Aug 11, 2014 7:51 pm Post subject: Re: 40hp wrist pin height |
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| bdub475 wrote: |
Does anyone know the pin height on stock 40hp pistons? I'm trying to figure out what the distance from main center to the top of the piston.
Half stroke 32mm + Rod length 130mm + Pin height ?
I plan to build a 40hp stroker using a 69mm crank and modified 40hp rods. I'm trying to find 77mm or 83mm pistons with the correct pin size and height to keep the engine close to stock width. |
Stroke increase is 5mm==2.5mm per cylinder shim. To me this seems inconsequencial. The tin still fits well, and the exhaust and intake can be bent to fit. Use 1600 pushrods, and you're home. |
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bdub475
Samba Member
Joined: April 05, 2009
Posts: 577
Location: Los Lunas, New Mexico
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| Posted: Mon Aug 11, 2014 8:07 pm Post subject: |
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| Thanks Avus. Thats most likely what I will end up doing. I just wanted to make sure there isn't a better of the shelf piston that would work. |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26789
Location: Colorado Springs
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| Posted: Mon Aug 11, 2014 10:32 pm Post subject: |
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| should be 39mm |
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pig-pen
Samba Member
Joined: December 04, 2012
Posts: 570
Location: United Kingdom
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| Posted: Mon Aug 11, 2014 10:52 pm Post subject: |
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I have some NOS 83.5mm pistons, 20mm pin and good 83.5mm (1500) cylinders that I was going to use on a 36hp build...
change of direction means I am using 80mm to stay in 1400cc engine class... so they are for sale for the right money. Pm me if you like...
alternatively I have a note somewhere of some Japanese pistons that are 77mm with 22mm pin and a lower pin height which would get you closer to stock width... I will have a rummage.
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