03-13-2014, 08:40 PM | #1 |
Getting Wild
Join Date: Feb 2013
Location: California
Posts: 93
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Compression numbers
Alright, my GX420 has been broken in. Its got a good 12-14 hours of use on it, and just gave it its third oil change. Rode it for about half an hour, and did a compression test:
Dry: 81 PSI Wet: 85 PSI Stock internals, no governor, VC Fuel delivery setup, ARC Intake w/ K&N Filter Was holding the throttle open when cranking. Seems kind of low for an engine with an 8:1 CR, but yep thats what i got. |
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03-14-2014, 08:40 AM | #2 |
Gone Wild
Join Date: Jun 2012
Location: Central NY
Posts: 1,020
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Re: Compression numbers
I thought the clones have a compression release built into the cam that holds the valves open a bit...
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03-14-2014, 10:01 AM | #3 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Compression numbers
They do. Testing compression is tough on these engines.
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03-15-2014, 04:57 PM | #4 |
Getting Wild
Join Date: Feb 2013
Location: California
Posts: 93
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Re: Compression numbers
Hmmm... Thats interesting. I thought certain performance cams had comp release on them, but maybe the stock one does.
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03-15-2014, 10:56 PM | #5 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Compression numbers
Both do.
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03-24-2014, 07:26 PM | #6 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,433
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Re: Compression numbers
The starters don't work so well without comp release. You have to let off the valve lash until it stops working, you can see it bump.
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03-24-2014, 08:55 PM | #7 |
I Refuse To Get Stuck!!!
Join Date: Jun 2010
Location: Hilton,NY
Posts: 5,427
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Re: Compression numbers
Why are they running compression releases on performance cams?When we raced Karts,that was the first thing done-away with.Even in a box-stock class.
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