Best Piston Compression for All Motor
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From: Schofield Barracks, HI, United States
Best Piston Compression for All Motor
I have been told that with an All Motor setup that a 11:1 or 11:3 compression is the best.....Wondering what the best to use for daily driver and 91 octane........
Modified by 24K SI at 5:09 AM 9/3/2004
Modified by 24K SI at 5:09 AM 9/3/2004
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Honda-Tech Member
Joined: Dec 2001
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From: assville, MI, USA
Re: Best Piston Compression for All Motor (WAFFLES)
All this talk of compression and not once a mention of cams.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WAFFLES »</TD></TR><TR><TD CLASS="quote">As high as you can safely tune. It also depends on how often it's driven on the street, if at all.</TD></TR></TABLE>
Again, I disagree. If your compression is too high, the piston starts to lose velocity as it reaches TDC, and your high end power suffers.
Wild cam engines can get away with running insane compression because so much is bled during the compression stroke, because the intake valves are still slightly open due to overlap.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WAFFLES »</TD></TR><TR><TD CLASS="quote">As high as you can safely tune. It also depends on how often it's driven on the street, if at all.</TD></TR></TABLE>
Again, I disagree. If your compression is too high, the piston starts to lose velocity as it reaches TDC, and your high end power suffers.
Wild cam engines can get away with running insane compression because so much is bled during the compression stroke, because the intake valves are still slightly open due to overlap.
Honda-Tech Member
Joined: Jul 2001
Posts: 5,307
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From: Tulsa, OK
Re: Best Piston Compression for All Motor (StyleTEG)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG »</TD></TR><TR><TD CLASS="quote">All this talk of compression and not once a mention of cams.
Again, I disagree. If your compression is too high, the piston starts to lose velocity as it reaches TDC, and your high end power suffers.
Wild cam engines can get away with running insane compression because so much is bled during the compression stroke, because the intake valves are still slightly open due to overlap.
</TD></TR></TABLE>
True. I kinda thought about that after what I typed, but I guess if you consider runing a cam with lots of duration, that bleeds a lot of compression, then you can get away with running a higher amount. 91 octane is quite a limiting factor.
Again, I disagree. If your compression is too high, the piston starts to lose velocity as it reaches TDC, and your high end power suffers.
Wild cam engines can get away with running insane compression because so much is bled during the compression stroke, because the intake valves are still slightly open due to overlap.
</TD></TR></TABLE>
True. I kinda thought about that after what I typed, but I guess if you consider runing a cam with lots of duration, that bleeds a lot of compression, then you can get away with running a higher amount. 91 octane is quite a limiting factor.
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