Cui or rpms January 21, 2020 08:46AM
Hi all looking for opinions, our class rules are 13mm p pump limit 401cui max @ 3000rpm or 3200rpms allowed under 370cui, no water injection, intercooler allowed no turbo limits.
Currently run a Deere 359cui but have a 6.8/414 sitting. If I was to decube the 414 would there be any advantage with 200rpm less?
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Re: Cui or rpms January 21, 2020 12:36PM
359/6059 stroke = 4.33"
414/6068 stroke = 5.00"

Both are same bore at 4.19"

For me, it's a no brainer. I'd decube the 414 on the bore ever so little and run with it. That long stroke will produce way more torque at low rpm.

Just my opinion.
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Re: Cui or rpms January 21, 2020 11:31PM
Thanks that's what I was thinking.
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Re: Cui or rpms January 22, 2020 12:00AM
If this is a light weight class and using a good intercooler do not give up bore size. The rpm difference would nearly offset the cube difference but not quite. I’d destroke the 414 imo and more importantly I’d use whichever engine has the better cylinder head
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Re: Cui or rpms January 22, 2020 12:34AM
The bore reduction is so minimal it will be of no real consequence. We're talking like .065" reduction to make the ci limit.
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Re: Cui or rpms January 22, 2020 01:05AM
Your opinion is fine and naturally the cheapest route. But bottom line is whichever engine has the best cylinder head coupled without reduced bore size with those rules will make the most power. If easy and cheap is the goal then I agree your way is the best
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Re: Cui or rpms January 22, 2020 05:29AM
Cylinder heads are identical. Class is 7700lbs.
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