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Harry Ferguson Tractors Discussion Forum

Overbore Z129 kits

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Author  [Modern View]

07-31-2020 11:25:35

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Hi all!
Just got a '52 TO-30(wifey got it for my bday)...

Looking at overhaul kits and they all say overbore to 3 3/8". I have a few questions so thanks in advance.
1) Why are they all overbore instead of stock?
2) I take it that's boring out the cylinder wall for a larger O.D sleeve?
3) If the blocks not already cracked (which I read they are prone to)... Will boring seriously weaken the block?

Thanks sooo much!

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07-31-2020 17:21:08

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 Re: Overbore Z129 kits in reply to pudland, 07-31-2020 11:25:35  
Quoting Removed, click Modern View to see

True true.... It's not like it's a 4bbl right! 🤣

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07-31-2020 19:31:26

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 Re: Overbore Z129 kits in reply to pudland, 07-31-2020 17:21:08  
4bbl about 600 CFM good for most engines. Bigger carb generally needs a bigger cam and larger valves don't hurt either. Whereas there is no replacement for displacement, you still need gears for go. Hence the newer vehicles with transmissions larger than the engines. Here's your 2.0 with a turbo and a 10 speed trans. Hit your power band and shift all the way up.

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07-31-2020 13:03:39

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 Re: Overbore Z129 kits in reply to pudland, 07-31-2020 11:25:35  

Not sure if that's good or bad though.

Thats like an 1/8" added to the combustion chamber volume. I'll have to do the math but I wonder if I have to "tune the carb" to make up for the added volume....

Thanks again!

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07-31-2020 16:12:49

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 Re: Overbore Z129 kits in reply to pudland, 07-31-2020 13:03:39  
Bolt it on and see what you get. That carb has already been tuned to make up for weaker compression for how long? Once it is running, then look at it. If it ain't broke, don't fix it.

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07-31-2020 12:46:46

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 Re: Overbore Z129 kits in reply to pudland, 07-31-2020 11:25:35  
No block boring needed, the wet SLEEVE is thinner...

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