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Big Valves Or Small


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#1 Rbrracing32 OFFLINE  

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Posted June 25, 2014 - 03:01 PM

Guys building a 12 for a 4000 rpm class. I'm wondering which would be better to stay with the stock valve size or go .125 bigger than whats there now on the intake and the exhaust. I'm using a .330 lift ground cam #30 carb. Honed .030 over. In a cub cadet 106. Thks for any info.
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#2 LilysDad ONLINE  

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Posted June 25, 2014 - 03:17 PM

I'm on here so I can follow the answers!


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#3 HANKG ONLINE  

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Posted June 25, 2014 - 03:37 PM

I'm on here so I can follow the answers! HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA



#4 Trav1s OFFLINE  

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Posted June 25, 2014 - 03:42 PM

Any more specs?  Stock bore?



#5 LilysDad ONLINE  

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Posted June 25, 2014 - 03:51 PM

 

I'm on here so I can follow the answers! HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA

 

It just gets easier and easier to make folks laugh. Hummmph!


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#6 skyrydr2 OFFLINE  

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Posted June 25, 2014 - 05:34 PM

You need to also port the exhaust if you do bigger valves. Any valve/ canwork rrequires port work to make it effective and only turning 4 k it won't take much to become wasteful on fuel.
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#7 Rbrracing32 OFFLINE  

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Posted June 25, 2014 - 05:45 PM

Standard bore

#8 Dieselcubmike ONLINE  

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Posted June 25, 2014 - 06:30 PM

Shame its only governed to 4000 rpms. With all that work done it would be a competitive puller. What about a head and a billet flywheel?  


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#9 Rbrracing32 OFFLINE  

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Posted June 25, 2014 - 07:01 PM

Yeah but it's for my kids and if I keep it in the stock class it don't break me.they enjoy pulling and dad likes to work on them. I enjoy the building part and the engien stuff is cheaper to me being I don't have to pay for machine work.
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#10 Rbrracing32 OFFLINE  

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Posted June 25, 2014 - 07:02 PM

After this motor is done I'm gona Change some gears in the trans.

#11 propane1 ONLINE  

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Posted June 25, 2014 - 07:34 PM

Just wondering what kind of hp and torque it will make with that work done. I don't pull tractors, just like hp and how to get it. Noel

#12 Rbrracing32 OFFLINE  

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Posted June 25, 2014 - 08:53 PM

Well Noel I don't know. I just go on that Brian miller site and read then I combine my knowledge and his and see what I come up with what I'm doing isn't a drop in the bucket to what the guys that pull super stock stock alters and so on. If I had the money to put out there I would build me one. But I'm just trying to have a good time doing it. I enjoy working on old lawn mowers and full size tractors so my kids benefit from my hobby.
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#13 WNYTractorTinkerer OFFLINE  

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Posted June 26, 2014 - 01:10 AM

:good_job:  :nothingtoadd:






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