14.2:1 ompression?

thacker400 · 02-04-2012, 01:44 PM

i read that just a single layer gasket will take you from 10:1 to 12.2:1 compression ratio.
So a single layer gasket and a 12:1 piston should make it 14.2? which would require race gas?

10(stock) + 2.2(single gasket) + 2 (high comp piston) = X

X = new compressino ratio

is this right?
if so does that mean race gas?

atv4life95 · 02-04-2012, 01:49 PM

Stock compression is 11.3:1. By installing a single layer base in place of the 3 layer on there stock, it will bump the 11.3:1 up to 12.2:1. If you got a 12:1 piston, I would recommend just leaving a 3 layer base on it otherwise it will bump up the compression to about about 12.9:1 or 13:1 which is race fuel territory.

decentZ89 · 02-04-2012, 01:58 PM

but then why is everyone saying if you get a high comp piston that is the c/r when using a one layer gasket? now im confused

atv4life95 · 02-04-2012, 02:03 PM

Just follow by what's posted below...

Stock compression ratio (with 3 layer gasket) = 11.3:1
single layer gasket added compression = .9

The Suzuki DRZE has the same engine as the Z400 except for different cam profiles, a single layer base gasket, and some other things, and it's stock ratio is 12.2:1 (.9 points more than the 11.3:1 Z400 stock ratio.) This is all due to the fact that the DRZE has a single layer gasket in place of the 3 layer that the Z has.

atv4life95 · 02-04-2012, 02:04 PM

If you purchase a 12:1 compression piston, and use a single layer base gasket, your new compression ratio will be 12.9:1 which is borderline pump/race fuel. With that ratio, I would not use anything lower than 95 octane gasoline.

TuckerHardRide · 02-04-2012, 02:17 PM

Use a two layer then.

z455 · 02-04-2012, 02:25 PM

Quote:

Originally Posted by atv4life95

If you purchase a 12:1 compression piston, and use a single layer base gasket, your new compression ratio will be 12.9:1 which is borderline pump/race fuel. With that ratio, I would not use anything lower than 95 octane gasoline.

Almost all supermarket pistons for the LTZ were originally designed to be used in the DRZ. So the pistons are rated for the single layer base gasket. Then when you use the three layer gasket you lower the compression below the advertised rating.

jasmf24 · 02-04-2012, 02:40 PM

Quote:

Originally Posted by z455

Almost all supermarket pistons for the LTZ were originally designed to be used in the DRZ. So the pistons are rated for the single layer base gasket. Then when you use the three layer gasket you lower the compression below the advertised rating.

Agree

atv4life95 · 02-04-2012, 02:41 PM

Quote:

Originally Posted by z455

Almost all supermarket pistons for the LTZ were originally designed to be used in the DRZ. So the pistons are rated for the single layer base gasket. Then when you use the three layer gasket you lower the compression below the advertised rating.

I think the auto correct got you.. "Supermarket"?

I can't understand why they would do this? The LTZ never came with a single layer base. How could they expect you to install a single layer base gasket with your machine, if it comes with a 3 layer gasket and all the gasket kits I know of come with a 3 layer replacement? To me, that doesn't really make all too much sense. Not trying to call you out or anything.

SMILEY18 · 02-04-2012, 04:05 PM

They do this because, otherwise they would have two different part numbers and info for the same piston for the ltz and drz. That would be a total waste of time and money. So the advertised cr is that with a single base gasket. One part number, one discription. Simple!

atv4life95 · 02-04-2012, 04:14 PM

Quote:

Originally Posted by SMILEY18

They do this because, otherwise they would have two different part numbers and info for the same piston for the ltz and drz. That would be a total waste of time and money. So the advertised cr is that with a single base gasket. One part number, one discription. Simple!

Makes sense!

biggiej42 · 02-04-2012, 04:29 PM

Aftermarket piston compression ratings are based on a SINGLE layer base gasket. If you buy a 12.5:1 piston, and have a single layer gasket, your compression is 12.5:1.

Pulido221 · 02-04-2012, 05:51 PM

Mine is a JE 13.1 compression piston, so I left the 3 layer gasket on so I can run pump gas and not race fuel

kapt1eye · 02-04-2012, 09:14 PM

This is interesting...so then, the 12.5:1 piston I just put in, with my drz base gasket, gives me 12.5, right?Cuz, premium pump gas with an octane booster, is what I ran without either, and I'd like to keep it that way.

kapt1eye · 02-04-2012, 09:18 PM

Quote:

Originally Posted by Pulido221

Mine is a JE 13.1 compression piston, so I left the 3 layer gasket on so I can run pump gas and not race fuel

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

That seems like a HUUGE WASTE!

02-04-2012, 01:44 PM	#1 (permalink)
thacker400 :::Mini LT50 Rider::: Join Date: Dec 2011 Location: Ashland, Kentucky Posts: 112	14.2:1 ompression? i read that just a single layer gasket will take you from 10:1 to 12.2:1 compression ratio. So a single layer gasket and a 12:1 piston should make it 14.2? which would require race gas? 10(stock) + 2.2(single gasket) + 2 (high comp piston) = X X = new compressino ratio is this right? if so does that mean race gas? __________________ 06 KFX 400 437 12:1 kibblewhite SUDCO FCR AC Racing DG ITP Pro Armor Uni

02-04-2012, 01:49 PM	#2 (permalink)
atv4life95 :::LT500 Rider::: Join Date: May 2011 Location: Westchester NY Posts: 1,245	Stock compression is 11.3:1. By installing a single layer base in place of the 3 layer on there stock, it will bump the 11.3:1 up to 12.2:1. If you got a 12:1 piston, I would recommend just leaving a 3 layer base on it otherwise it will bump up the compression to about about 12.9:1 or 13:1 which is race fuel territory. __________________ 2003 Suzuki Z400 - SOLD Fully Worked & Race Ready, '98 Yamaha YZ125 - My New Toy

02-04-2012, 01:58 PM	#3 (permalink)
decentZ89 :::LT250 Rider::: Join Date: Nov 2011 Location: New York Posts: 803	but then why is everyone saying if you get a high comp piston that is the c/r when using a one layer gasket? now im confused __________________ 2003 Suzuki Ltz 400 -got some stuff 2000 Honda XR50 - pitbike 2006 Nissan SE-R Spec-v - daily driver 1993 Jeep Wrangler - built and swapped

02-04-2012, 02:03 PM	#4 (permalink)
atv4life95 :::LT500 Rider::: Join Date: May 2011 Location: Westchester NY Posts: 1,245	Just follow by what's posted below... Stock compression ratio (with 3 layer gasket) = 11.3:1 single layer gasket added compression = .9 The Suzuki DRZE has the same engine as the Z400 except for different cam profiles, a single layer base gasket, and some other things, and it's stock ratio is 12.2:1 (.9 points more than the 11.3:1 Z400 stock ratio.) This is all due to the fact that the DRZE has a single layer gasket in place of the 3 layer that the Z has. __________________ 2003 Suzuki Z400 - SOLD Fully Worked & Race Ready, '98 Yamaha YZ125 - My New Toy

02-04-2012, 02:04 PM	#5 (permalink)
atv4life95 :::LT500 Rider::: Join Date: May 2011 Location: Westchester NY Posts: 1,245	If you purchase a 12:1 compression piston, and use a single layer base gasket, your new compression ratio will be 12.9:1 which is borderline pump/race fuel. With that ratio, I would not use anything lower than 95 octane gasoline. __________________ 2003 Suzuki Z400 - SOLD Fully Worked & Race Ready, '98 Yamaha YZ125 - My New Toy

02-04-2012, 02:17 PM	#6 (permalink)
TuckerHardRide :::Official Spammer::: Join Date: Feb 2008 Location: PA Posts: 3,220	Use a two layer then. __________________ 2006 LTR450 Engine Mods: Yoshimira Cherry Bomb - RS-5 Full Exhaust - Inspection Plug Choke B/O Nut - Start Button JE Piston Suspension, Steering & Chassis: Flexx Bars w Turner Clamps - Precision Damper - Tag Skid Plate Powermadds - LT Fox Evol w FuelATV A-Arms - Fox Podium Rear Pro Armor Grab Bar - IMS Roll Nerf + Heel + Bumper Misc: DID X-Ring Chain - Sprocket Guard - Frame Guards - ProDesign K/S Hiper Tec 3 - ITP Beadlock Rear Rims Parted Out: 2004 LTZ400 - September 2011 QOTM

02-04-2012, 04:05 PM	#10 (permalink)
SMILEY18 :::Mini LT80 Rider::: Join Date: Mar 2004 Location: WI Posts: 158	They do this because, otherwise they would have two different part numbers and info for the same piston for the ltz and drz. That would be a total waste of time and money. So the advertised cr is that with a single base gasket. One part number, one discription. Simple!

02-04-2012, 04:29 PM	#12 (permalink)
biggiej42 :::Official Spammer::: Join Date: Jun 2006 Posts: 3,356	Aftermarket piston compression ratings are based on a SINGLE layer base gasket. If you buy a 12.5:1 piston, and have a single layer gasket, your compression is 12.5:1. __________________ 05' Z434 12.5:1CP,Full Yosh TRC,FCR40,175/45,Rat Stack,Dyna Programmable,AMR Coil,KW Valvetrain,536/540 Web's,DID Tchain,PWR Radiator,Raptor petcock,Gunnar Kill,Elka S3 Front+Rear w/link,Roll+1 Stem,GPR Stabilizer,SL Hyd.Clutch,Tag T2,LSR+3 Arms,Burgard+1 Swinger,Quadtech Rad Shrouds,Supersprox 14/40t,UM Air Box,YFZ Calipers,SS Lines,PA Bumper,Asv's,Roll Nerfs/Heels/Pegs,LSR Axcalibar,Douglas G2 Beadlocks/Razr's,Hid,YFZTail,Pwrmadd's,TT Vapor+Dash,CV4's,RickyStator. July 2011 QOTM

02-04-2012, 05:51 PM	#13 (permalink)
Pulido221 :::Post Whore::: Join Date: Jul 2010 Location: Fresno, Ca Posts: 2,315	Mine is a JE 13.1 compression piston, so I left the 3 layer gasket on so I can run pump gas and not race fuel __________________ Houser +2 a arms ( tric trac ) ProArmor nerfs,bump,grab bar Renthal Fat Bars ( magrath ) Houser +2 antivibe steer stem Fox Podium X front shocks TCS MX rear shock ASV unbreakable levers Full Curtis Sparks exhaust Dyno jet kit/FCI intake Old style hot cams Int/Ex ITP GNCC tires +2 GForce hubs Quadtech carbon fiber hood Kfx450R Monster graphic kit 450 BBK 13.1 JE piston KB valves / DRZ springs Mild ported head by me " WEAR A DAMN HELMET "

02-04-2012, 09:14 PM	#14 (permalink)
kapt1eye :::Mini LT80 Rider::: Join Date: Jan 2012 Location: Vernon,BC,Canada Posts: 152	This is interesting...so then, the 12.5:1 piston I just put in, with my drz base gasket, gives me 12.5, right?Cuz, premium pump gas with an octane booster, is what I ran without either, and I'd like to keep it that way.

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