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Re: [turbobike] Compression Ratio

Dave Morrill (david.p.morrill@fairchildsemi.com)
Fri, 05 Nov 1999 15:09:56 -0500 

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Steve,
    I'm not an expert on CR, but do coat your pistons (10:1?).  I was
eating them up during
tuning my turbo sled, after coating them I only cooked on.  I highly
suggest you
do it.  I was melting pistons around 1100-1200 egt, and ran as high as
1450 with
ceramic coated pistons without damage.  Gives you some room to make
mistakes
during tuning.

Best,
    Dave.

Steve Leonard wrote:

>  I am building a 1983 GPZ1100, with a MoTeC M4 engine management
> system and a IHI-RHB5 turbocharger..... Since this a 2-valve motor and
> I want it to be some what streetable (preferabably pump gas), what
> compression do you recemmend, (1260cc), to reduce detonation I can
> retard the timing as boost increases with the MoTec software. Also
> will any great benefit be obtained with 1mm over-size stainless intake
> and exhaust valves? Is there any advantage to having the combustion
> chamber and pistons "coated" with the thermal barrier compounds that
> are available?( I live about 10miles from a place that does
> it) regardsSteve

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Steve,
    I'm not an expert on CR, but do coat your pistons (10:1?).  I was eating them up during
tuning my turbo sled, after coating them I only cooked on.  I highly suggest you
do it.  I was melting pistons around 1100-1200 egt, and ran as high as 1450 with
ceramic coated pistons without damage.  Gives you some room to make mistakes
during tuning.

Best,
    Dave.

Steve Leonard wrote:

 I am building a 1983 GPZ1100, with a MoTeC M4 engine management system and a IHI-RHB5 turbocharger..... Since this a 2-valve motor and I want it to be some what streetable (preferabably pump gas), what compression do you recemmend, (1260cc), to reduce detonation I can retard the timing as boost increases with the MoTec software. Also will any great benefit be obtained with 1mm over-size stainless intake and exhaust valves? Is there any advantage to having the combustion chamber and pistons "coated" with the thermal barrier compounds that are available?( I live about 10miles from a place that does it) regardsSteve

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