Looking For High Compression 100mm CRF Piston - Honda TRX Forums: Honda TRX 450R Forum
 
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post #1 of 8 (permalink) Old 05-10-2019, 12:52 PM Thread Starter
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Looking For High Compression 100mm CRF Piston

Im looking for a high compression 100mm 02-08 CRF450R piston for my 05 motor. Highest I can find is the CP M2052 which is 13.5. Anybody familiar with a piston thats higher than that? Thanks!
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post #2 of 8 (permalink) Old 05-10-2019, 09:01 PM
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Is your head decked and you want higher then 13.5 or leaving the head alone and making up for the combustion chamber size

Just wondering,

But I have no info on the piston to actually be any help, lol
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post #3 of 8 (permalink) Old 05-11-2019, 01:12 AM Thread Starter
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Ha! No worries. Head is decked but combustion chamber has some work done to it and I want to make up for the difference in combustion chamber size. Was running a 14.25 Venom, but obviously those aren’t available any more lol. Trying to not deck the head anymore and mess up the timing if at all possible.
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post #4 of 8 (permalink) Old 05-23-2019, 10:39 AM Thread Starter
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Anyone seen anything?
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post #5 of 8 (permalink) Old 05-23-2019, 12:51 PM
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Have you spoke with John @ Racers Edge? They build some high compression motors. I spoke with him not too long ago. He was mentioning overall 15:1 Some of that may come from their head. Good luck with the search.
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post #6 of 8 (permalink) Old 05-23-2019, 03:08 PM Thread Starter
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I’ve talked with him. He’s scared to death of compression. I told him I’m at 13.4:1 on my 501 and he thought that was insane, and said he’d never ship a motor that was run all day long with that kind of compression. Which is funny because I run pump gas. . . .
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post #7 of 8 (permalink) Old 05-23-2019, 05:21 PM
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Odd. That is not what he told me. He was very clear on a all bore, high compression motor. I even told him my type of riding, wide open farm fields and trails. Maybe he was talking strictly drag racing.
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post #8 of 8 (permalink) Old 05-23-2019, 10:16 PM
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Zero need for over 13.5 static compression, and I'm guessing you'll have even more since it's sounding like you're trying to run a '04/05 stroker crank that's been bushed down to a 19 pin so it keeps the 111 rod. All they do is fight the over-rev when you stack a TRX full of compression, hence the need for a Dyna, especially on low octane fuels.

The 2052 and 2054 are actually really good pistons with clean dome designs. Remember it isn't always about big compression. You can make over 70 with 13:1 shelf CP pistons in almost every combo available.

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