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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Turn a Z134 into a Z145?

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Part Time Farme

10-31-2003 05:17:30




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My 1958 MF50 with a Z134 is smoking badly and needs rings at least so I plan to replace the cylinders and sleeves. Some of the replacement kits are bored out to the same bore as the Z145. If I put one of these in do I need to do additional work to the head and should I find a Z145 cam. Doesn't seem like the extra volume will help without these other mods. Anyone have experience with this? Any comments will be appreciated.

PTF

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TO35

10-31-2003 17:36:50




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 Re: Turn a Z134 into a Z145? in reply to Part Time Farmer, 10-31-2003 05:17:30  
PTF....Theres no substitute for cubic inches but in my experiance theres no significant gain in just a bigger bore in the z134 atleast nothing you'd be able to detect without a dyno. With a bigger bore you would need to also improve the head flow and step up the carb. size, compression and then exhaust flow to see the difference. Due to crude castings the 134 head they can be improved greatly by touching up the ports and improving carb. fuel flow. And it never hurts to bump up the compression. I've tried many modifications on the 134 but the dyno results are better when fuel and flow and compression are improved and governed speed is increased slightly.
A flow bench and dyno are invaulable when doing these modifications anything less is just a guess.
Short answer..yes you can do it, but personally I'd stick with stock bore and work on the head flow and carb. and exhaust and you will feel more power

best wishes
TO

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Part Time Farmer

11-01-2003 14:33:05




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 Re: Re: Turn a Z134 into a Z145? in reply to TO35, 10-31-2003 17:36:50  
TO, What you say is as I suspected. I think the oversized cylinders are just a marketing trick to sell reconditioned sleeves. I don't have access to a flow bench but when I had the head off last summer I gasket matched the intake to the head. What can I do to increase compression and carb performance?

PTF



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TO35

11-01-2003 17:20:49




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 Re: Re: Re: Turn a Z134 into a Z145? in reply to Part Time Farmer, 11-01-2003 14:33:05  
PTF...easiest way to get more compression is shave the head ..it probably needs straightening some anyway...I would not go more than 40 thousandths. cleaning up the ports will help alot too, just kinda eyeball them and cut out the casting marks and work on the edges closest to the valves they need rounding. Then remove the valves and polish them as far down as you can reach all the way up to the botton of the seat...that will increase your flow approx. 40%.
If you really are concerned about flow chuck the valves in a drill press and polish the back side on the valve heads down to the stems, the more you polish there the better the flow.
I presume you have a MS tsx 33 carb. you will need to disassemble and clean up the casting marks also. I have acquired over the years several jets and have drilled them to different sizes, I have found that 2 sizes bigger than stock work very well. I bought my jet drill bits at napa auto parts...they are not that expensive around 25 buxs. On the mounting surface between carb. and intake you will need to match the gasket to carb. body and to intake manifold...the intake side can be ported quite a bit.
you stated you gasket matched the head...did you gasket match the manifold? if not you need too.
Here a few more tips...
on valve springs they are critical, you'll need just a tad more seat pressure with higher compression...easiest way is to shim the spring up. Stock specs are 45 to 55 lbs.@ 1 45/64 and 95 to 105 lbs. @1 27/64 stay on the high side numbers as close as possible or increase by 5 to 10 lbs. seat margins can be widened also . Make sure you don't skimp on the valve train ie. rocker shafts and tappets they need to be as close as possible to factory specs. to maxiumize performance.Check and measure the rocker faces and lash caps for wear limits. All the pertenet info is in the manual.
hope all this helps you if you need more info. post back or start a new post...
best wishes
To

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Part Time Farmer

11-02-2003 05:55:14




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 Re: Re: Re: Re: Turn a Z134 into a Z145? in reply to TO35, 11-01-2003 17:20:49  
TO, Many thanks. This will keep me busy for a while.

PTF



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