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Piston Ring Gaps | Bigger Gap For Nitrous? [HPA &QA]

September 11, 2019


– Rodrigo’s asked, I’m building a 4.6
modular Ford power plant using a stock rotating assembly but I plan
on running a moderate nitrous shot. My understanding is that I do need
to give the rings a looser gap due to the additional heat produced by nitrous. Is this recommended even if using
a moderate nitrous shot? OK so generally yeah the rule of thumb
is yes, if you are going to be using nitrous, it is a power adder. Very similar in a way to forced induction,
what we’re doing is adding more oxygen into the cylinder so that we can add more
fuel and we’re getting a bigger combustion event. So in turn this is going to create more
combustion temperature. And we do need to account for that. With nitrous though, what we do need
to sort of consider as well before you go and make a massive adjustment to
your ring end gaps, is how much nitrous are you adding
to the engine? How big physically is the nitrous shot,
and how often do you expect to be running it? So on a street car it’s probably pretty
difficult to use nitrous for an extended period of time. If you are building a drag car where
we see nitrous used a lot, then using nitrous for an entire run
down the drag strip can put a lot of stress on the engine and in that
instance I certainly would be recommending that you consider
loosening you ring end gaps slightly. That question was taken from one of
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4 Comments

  • Reply Che M December 1, 2018 at 10:20 pm

    HPA's the best! Only thing missing is Rotary support lol.

  • Reply BeyTek December 1, 2018 at 10:29 pm

    Is there a set calculation for gapping rings more than factory spec. IE doubling the HP = .2mm extra etc. I personlay like them on the looser side of things as when i run my cruise areas super lean for mpg the heat created will effect factory set rings.

  • Reply NGT December 2, 2018 at 3:08 am

    Does ring thickness affect how much heat expansion occurs?

  • Reply Jairo d January 27, 2019 at 6:54 pm

    eres un pendejo pinche guero no sabes lo k dices solo un actork no sabe ni madre d lo k habla

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