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  #46 (permalink)  
Old 09-25-2013, 01:08 PM
How fast is fast enough?
 
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Originally Posted by cobalt327 View Post
It's not like the engine won't spin to 7K rpm
stock block, stock crank, stock rods, and cheap pistons... Its a lot like it won't spin to 7k... or at least it won't spin that high twice...

7,000 RPM s a LOT to be asking from a stock short block.

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  #47 (permalink)  
Old 09-25-2013, 05:28 PM
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The point I am making is the engine will spin to 7K rpm- plus. Maybe not reliably and maybe it'll blow- but it'll spin that high. If it's laboring and is incapable of revving past, say, 6K rpm then something is wrong.
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  #48 (permalink)  
Old 09-25-2013, 06:12 PM
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Originally Posted by MrChevyDC3 View Post
What would you consider a "decent amount of nitrous"? I have a 150/250 dual stage NOS kit, and I plan on spraying the 150. I'll have an msd electronic retard box, and I'll run 110 octane at the track when I plan to spray. The motor is a 4 bolt main OEM.
Using the KB info as an example, a NA engine w/a 4.030" bore might use a top ring gap of 0.0065" per inch of bore diameter. For street nitrous use, this factor is increased to 0.008"/in. I'd consider a 150 HP shot as being "street" nitrous use. That said, it is always a good idea to consult w/the manufacturer on such things. They are in a better position to recommend exact specs. Piston to wall clearances are sometimes opened up slightly (half a thou, so not talking much) at the street nitrous level, again- consult the manufacturer.

BTW, current thinking among many top flight engine builders has the second ring gap ~ 40% wider than the top ring. Ex. 0.016" top/0.022" second. So you might want to research this as well.
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  #49 (permalink)  
Old 09-25-2013, 08:03 PM
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