14.2:1 ompression? - Page 2

z455 · 02-04-2012, 09:40 PM

You can run 93 OCT with your piston. No need for octane booster.

His piston is around 12.2:1 with the three layer, 13:1 with single layer. The carb is whats killing him

No, i'm not going to let that go

thacker400 · 02-04-2012, 09:58 PM

well that sucks...

I would have been better off with a single layer gasket than buying the gasket and a 12:1 piston.

so a 12:1 piston w single layer gasket would actually produce less compression than stock piston with single layer?

ANYONE HAVE THE FORMULA TO CALCULATE C/R USING MAX CYLINDER PSI?

jasmf24 · 02-04-2012, 10:07 PM

What ever your aftermarket piston advertised compression is, its based off a single ply base gasket.

z455 · 02-04-2012, 10:54 PM

Quote:

Originally Posted by thacker400

well that sucks...

I would have been better off with a single layer gasket than buying the gasket and a 12:1 piston. Yes, but if you needed a piston then maybe not.

so a 12:1 piston w single layer gasket would actually produce less compression than stock piston with single layer? yes

ANYONE HAVE THE FORMULA TO CALCULATE C/R USING MAX CYLINDER PSI?

you should use A real compression ratio calculator. Cranking cylinder PSI isn't a true indication of your compression ratio, its just how much pressure your producing while starting. Your compression ratio is the cylinder volume at TDC compared to BDC. Also factoring your piston dome/dish, combustion chamber volume (stock is 25cc), gasket thicknesses and bore/stroke.

Pulido221 · 02-04-2012, 11:03 PM

Quote:

Originally Posted by kapt1eye

So then,by what's been said, this 13.1 piston is REALLY only running stock compression?

That seems like a HUUGE WASTE!

I'm not at stock compression, it's around 12.2.1. Also that piston is part of my 450 big bore that I have on my bike and I got it all trading my carb for it straight up

we could race sometime so I can show you it's not a waste

Pulido221 · 02-04-2012, 11:13 PM

Quote:

Originally Posted by z455

You can run 93 OCT with your piston. No need for octane booster.

His piston is around 12.2:1 with the three layer, 13:1 with single layer. The carb is whats killing him

No, i'm not going to let that go

Haha! I know your not gona let it go til I get my fcr lol.... I'm working on it as soon as I get my tax money I'm getting one and a noss adaptor for it and have sredrum taper bore it at a 42mm. Been stalking eBay every night for a good deal. My g/f is buying my haulers for me so that's saving me cash towards my carb

z455 · 02-04-2012, 11:20 PM

haha I;m going the same route, Buy one and send it to Sredrum. PM me what you've seen them going for? Don't want to get off topic here.

hondareconred · 02-06-2012, 12:20 PM

I want 14.1 compression!

kapt1eye · 02-06-2012, 10:02 PM

Quote:

Originally Posted by Pulido221

I'm not at stock compression, it's around 12.2.1. Also that piston is part of my 450 big bore that I have on my bike and I got it all trading my carb for it straight up

we could race sometime so I can show you it's not a waste

Dude, I wasn't bad mouthing. I was just trying to understand the whole compression thing. It was stated that a 12.2 piston with a 3 layer was stock compression. I was curious as to why your piston with a three layer wouldn't be the same, is all.
That's why I had the 'confused' thing after what I said.

02-04-2012, 09:40 PM	#16 (permalink)
z455 :::LT500 Rider::: Join Date: Jan 2010 Location: North Carolina Posts: 1,203	You can run 93 OCT with your piston. No need for octane booster. His piston is around 12.2:1 with the three layer, 13:1 with single layer. The carb is whats killing him No, i'm not going to let that go __________________ 04 LTZ 445 95mm CP 12.78:1************ Elka stage3 front & rear Web 540-539************* JRD +3 LT A-arms 42mm Kehin*************** Burguard +1.75 swingarm Full HMF shorty *********** Hiper tech3's in Kenda klaws Dyna programable********* Lonestar axle, carrier & stem

02-04-2012, 09:58 PM	#17 (permalink)
thacker400 :::Mini LT50 Rider::: Join Date: Dec 2011 Location: Ashland, Kentucky Posts: 112	well that sucks... I would have been better off with a single layer gasket than buying the gasket and a 12:1 piston. so a 12:1 piston w single layer gasket would actually produce less compression than stock piston with single layer? ANYONE HAVE THE FORMULA TO CALCULATE C/R USING MAX CYLINDER PSI? __________________ 06 KFX 400 437 12:1 kibblewhite SUDCO FCR AC Racing DG ITP Pro Armor Uni

02-04-2012, 10:07 PM	#18 (permalink)
jasmf24 :::KFX 400 Rider::: Join Date: Mar 2011 Location: Pittsburgh Posts: 910	What ever your aftermarket piston advertised compression is, its based off a single ply base gasket. __________________ 2004 KFX400, 12.2:1 Wiseco, HMF full exhaust, FCR-39 (170 M/ 42P/ 40L/ NCVQ, DRZ-E boot w/ compact head-stay), OSHC's, K-W valves w/ drz springs, Dyna Fs NP, Raptor Petcock, Wiseco cam chain, 400ex boot, Oversized clamp on UNI/K&N no lid, DRZ-E Base, DRZ Flywheel, LTR450 Front Shocks, blob-less ProTaper Contour bars (ATV High) w/ hot-start reverse, odi grips, Tusk nerfs, Full skids, 14/40, (R) Holeshot ITP HD (F) Rzr2, Port-N-Polish by me.

02-04-2012, 11:20 PM	#22 (permalink)
z455 :::LT500 Rider::: Join Date: Jan 2010 Location: North Carolina Posts: 1,203	haha I;m going the same route, Buy one and send it to Sredrum. PM me what you've seen them going for? Don't want to get off topic here. __________________ 04 LTZ 445 95mm CP 12.78:1************ Elka stage3 front & rear Web 540-539************* JRD +3 LT A-arms 42mm Kehin*************** Burguard +1.75 swingarm Full HMF shorty *********** Hiper tech3's in Kenda klaws Dyna programable********* Lonestar axle, carrier & stem

02-06-2012, 12:20 PM	#23 (permalink)
hondareconred :::LT500 Rider::: Join Date: Jan 2008 Location: Cave Creek, AZ Posts: 1,275	I want 14.1 compression! __________________ Nasty N/A Tuned KFX 400......... I LOL hard when I smoke 450s

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