Picked up a NEW engine, need some forged pisotns - Page 2

**PGTF2T** · 4-4-08, 7:04

maybe if we get enough people we can get a deal from weisco?

**zlyricist** · 4-4-08, 12:51

Quote:

Originally Posted by PGTF2T

maybe if we get enough people we can get a deal from weisco?

doubt it, most already have pistons around here. the bigger companies like weisco and pauter dont mess around either, you need to go big if you go through them

weisco already offers pistons for the kia

**lundgren420** · 4-4-08, 13:28

Diamond makes a pretty nice piston also, cant wait to try them out with some boost and No2.

**STW** · 4-4-08, 14:12

Hmm, I spy one great difference between wiseco pistons for mazda and nissan, the SR20DET pistons I had (I returned them to the shop to be exchanged for dished, the flat domes just wouldn't have worked) had teflon lining on the skirt.

**Bo0sted_Rafi** · 4-6-08, 1:40

Quote:

Originally Posted by fredio54

Because you get no quench! NO great tuning can make up for that. It falls under the same umbrella as extra thick headgaskets to lower compression. You can lose power and make it less safe that way...

You can't beat the laws of physics with tuning. You can only optimise up against the limits. Without quench those limits are significantly lower. If all parameters are the same except quench or not (same compression, octane, etc) you will make more power more safely with quench. You simply can not argue that.

Fred.

I proove one thing.

They work. Thats the point here and my argument. Why people think you gonna need low comp piston to run turboed? If you have a good setting in your car, you dont gonna have problems. Some peoples blowns they head with things like that. If you got more compression, get a better tunning, a good octane gas and nice timming setup.

Im running with sunoco 112oct @ 30degrees at full boost. My full boost is 30psi because i dont have any mod in my engine apart the 65mm, ported IM and 4g63 pistons from wiseco. If we use a higher comp pistons, i dont need a lot of boost like now.

**fredio54** · 4-6-08, 3:00

Most people want to run pump gas = 93aki / 98ron

What that means is that the margins are a lot slimmer for a given power. You can't just keep knocking out timing for forever, below about 15btdc you will be roasting the CRAP out of your turbo and exhaust and causing overheating issues.

define "work" ...

112 ron ? mon? aki? I'd bet the latter which is closer to 120RON which is alot, and more than I had on 10:1 with 17psi and a conservative 15btdc...

People KNOW they need low comp pistons to run PUMP gas with high/highish boost. That is a fact that can not be argued. If you want your setup efficient in boost, on pump gas, that is what you have to do.

4g63 give you that, but they take away quench, meaning more timing for the same PCP and therefore more flame front in front of the piston while trying to move up, and more chance of detonation during that period, and less power because of that back force even if you can advance enough, and reality is less power because you will probably have to retard to avoid that knock, moving PCP back too far after its optimal point.

it IS 4g63 that are like 2mm lower than deck isn't it?

if not, that all applies to which ever piston it is. if so, it all applies to these pistons.

**bakmans** · 4-6-08, 10:45

when you take away the quench you also transfer a lot more heat into your cylinder walls.
i prefer a lttle qunch to but alot of tuners dont do it. i know a 4cylinder m3 with a huge turbo (thought it was a gt40 ) making 800 hp with the pistons sitting 4mm below deck....
i think it would have made more power with less boost and a better quench on the same compression ratio. this would also be better for engine temperatures and a smoother cruise and better mileage.

**fredio54** · 4-6-08, 11:25

Exactly!

**Bo0sted_Rafi** · 4-6-08, 20:11

Quote:

Originally Posted by fredio54

Most people want to run pump gas = 93aki / 98ron

What that means is that the margins are a lot slimmer for a given power. You can't just keep knocking out timing for forever, below about 15btdc you will be roasting the CRAP out of your turbo and exhaust and causing overheating issues.

define "work" ...

112 ron ? mon? aki? I'd bet the latter which is closer to 120RON which is alot, and more than I had on 10:1 with 17psi and a conservative 15btdc...

People KNOW they need low comp pistons to run PUMP gas with high/highish boost. That is a fact that can not be argued. If you want your setup efficient in boost, on pump gas, that is what you have to do.

4g63 give you that, but they take away quench, meaning more timing for the same PCP and therefore more flame front in front of the piston while trying to move up, and more chance of detonation during that period, and less power because of that back force even if you can advance enough, and reality is less power because you will probably have to retard to avoid that knock, moving PCP back too far after its optimal point.

it IS 4g63 that are like 2mm lower than deck isn't it?

if not, that all applies to which ever piston it is. if so, it all applies to these pistons.

Im going to the dyno soon with pump gas. (93oct) and our goal its 350whp+

How many peoples in this forum got over 400whp here? The person who start this topic make a question and i give him my opinnion. If you want to buy a set of pistons in the local speed shop without wait of custom pistons , etc. You got a solution, thats it.

and my definition of "work" its my own results of it. Im join in this forum with some questions and few months of that, i ran 10 secs and my friend rans 9. Thats what i call "WORKS"

**bakmans** · 4-7-08, 5:15

yeah its like we said...

it works but its better to have a quench from 0.8mm. you can get power with a bigger quench but it just puts more heat in your cilinderwalls and gives bad mileage. and if yoyr going to order new (forged ornot) pistons why dont buy ones that give you a quench that you need or stay with the stock pistons. ive heard that some guys use the 2.0 sohc rods with your pistons to get quench. thats an idea to.

btw you guys keep calling it quench. over here we call it squish. is that term familiar over there to?

**STW** · 4-10-08, 1:14

You can get fancy pistons from Wiseco without bulk buy deal, and probably won't make discount with the number of orders you''d get with a FE DOHC bulk buy, thus I'm ordering mine custom from Wiseco:

http://wiseco.com/PDFs/Catalogs/AB08...mOrderAuto.pdf

It seems the delivery times fall between two weeks and two months, HOPEFULLY this won't delay the build too much. At least I'm getting the EXACT pistons I want, and not "close enough"!

**shwine617** · 4-17-08, 9:33

you made a custom order? I thoght wiseco already had pistons made up for our engine?

**STW** · 4-17-08, 10:38

I wanted them 8.5:1 C/R, 32mm compression height, with larger valve reliefs and moly coated skirt, I don' think there's a set matching that spec.

**fredio54** · 4-18-08, 5:54

Don't forget to post pics! :-)

**Dutch** · 6-19-08, 11:14

Quote:

Originally Posted by STW

I wanted them 8.5:1 C/R, 32mm compression height, with larger valve reliefs and moly coated skirt, I don' think there's a set matching that spec.

do u have an order number?

4-4-08, 13:28	#18 (permalink)
lundgren420 Join Date: Oct 2005 Location: OZARK, MO, USA Age: 25 iTrader: (8)	Diamond makes a pretty nice piston also, cant wait to try them out with some boost and No2.
	1988 MX6 N/A M/T -getting a new heart. Check it out http://www.mx6.com/forums/showthread...ferrerid=35300 1989 Probe GT M/T -my new toy 1980 Monte Carlo W/305 H.O.-my first ride and iv'e still got her

4-4-08, 14:12	#19 (permalink)
STW Join Date: Jan 2006 Location: Turku, Finland Age: 32 iTrader: (0)	Hmm, I spy one great difference between wiseco pistons for mazda and nissan, the SR20DET pistons I had (I returned them to the shop to be exchanged for dished, the flat domes just wouldn't have worked) had teflon lining on the skirt.
	626 '88 Wagon, turbo 2.0 DOHC My vBGarage My ride at CarDomain

4-6-08, 3:00	#21 (permalink)
fredio54 Join Date: Aug 2004 Location: Auckland, New Zealand iTrader: (1)	Most people want to run pump gas = 93aki / 98ron What that means is that the margins are a lot slimmer for a given power. You can't just keep knocking out timing for forever, below about 15btdc you will be roasting the CRAP out of your turbo and exhaust and causing overheating issues. define "work" ... 112 ron ? mon? aki? I'd bet the latter which is closer to 120RON which is alot, and more than I had on 10:1 with 17psi and a conservative 15btdc... People KNOW they need low comp pistons to run PUMP gas with high/highish boost. That is a fact that can not be argued. If you want your setup efficient in boost, on pump gas, that is what you have to do. 4g63 give you that, but they take away quench, meaning more timing for the same PCP and therefore more flame front in front of the piston while trying to move up, and more chance of detonation during that period, and less power because of that back force even if you can advance enough, and reality is less power because you will probably have to retard to avoid that knock, moving PCP back too far after its optimal point. it IS 4g63 that are like 2mm lower than deck isn't it? if not, that all applies to which ever piston it is. if so, it all applies to these pistons.
	DIYEFI.org - TRUE DIY engine management Mazda FE3/FE-DOHC Master Index Thread (work in progress) Mazda truck with FE-DOHC/FE3 "BIG like your house" Holset Turbo drinking 2.2 litres of fuel per minute ~= 385hp crank RIP SleepCounter :-( we will miss you! - RIP fredio54 :-( will we miss you?

4-6-08, 11:25	#23 (permalink)
fredio54 Join Date: Aug 2004 Location: Auckland, New Zealand iTrader: (1)	Exactly!
	DIYEFI.org - TRUE DIY engine management Mazda FE3/FE-DOHC Master Index Thread (work in progress) Mazda truck with FE-DOHC/FE3 "BIG like your house" Holset Turbo drinking 2.2 litres of fuel per minute ~= 385hp crank RIP SleepCounter :-( we will miss you! - RIP fredio54 :-( will we miss you?

4-10-08, 1:14	#26 (permalink)
STW Join Date: Jan 2006 Location: Turku, Finland Age: 32 iTrader: (0)	You can get fancy pistons from Wiseco without bulk buy deal, and probably won't make discount with the number of orders you''d get with a FE DOHC bulk buy, thus I'm ordering mine custom from Wiseco: http://wiseco.com/PDFs/Catalogs/AB08...mOrderAuto.pdf It seems the delivery times fall between two weeks and two months, HOPEFULLY this won't delay the build too much. At least I'm getting the EXACT pistons I want, and not "close enough"!
	626 '88 Wagon, turbo 2.0 DOHC My vBGarage My ride at CarDomain

4-6-08, 10:45	#22 (permalink)
bakmans Join Date: Mar 2006 Location: uden, holland Age: 27 iTrader: (1)	when you take away the quench you also transfer a lot more heat into your cylinder walls. i prefer a lttle qunch to but alot of tuners dont do it. i know a 4cylinder m3 with a huge turbo (thought it was a gt40 ) making 800 hp with the pistons sitting 4mm below deck.... i think it would have made more power with less boost and a better quench on the same compression ratio. this would also be better for engine temperatures and a smoother cruise and better mileage.

4-7-08, 5:15	#25 (permalink)
bakmans Join Date: Mar 2006 Location: uden, holland Age: 27 iTrader: (1)	yeah its like we said... it works but its better to have a quench from 0.8mm. you can get power with a bigger quench but it just puts more heat in your cilinderwalls and gives bad mileage. and if yoyr going to order new (forged ornot) pistons why dont buy ones that give you a quench that you need or stay with the stock pistons. ive heard that some guys use the 2.0 sohc rods with your pistons to get quench. thats an idea to. btw you guys keep calling it quench. over here we call it squish. is that term familiar over there to?

4-17-08, 9:33	#27 (permalink)
shwine617 Join Date: Aug 2004 Location: Spotswood, NJ, USA Age: 23 iTrader: (0)	you made a custom order? I thoght wiseco already had pistons made up for our engine?
	90 MX6 GT http://www.cardomain.com/ride/2036393 Stock: 15.446 @ 88.78 F2T Best: 12.71 @ 104 FE3T: 11.941 @ 99.03 (missed 4th) 470 WHP Turbonetics 50 trim @ 30psi videos:http://videos.streetfire.net/uploaded/Shwine617.htm

4-17-08, 10:38	#28 (permalink)
STW Join Date: Jan 2006 Location: Turku, Finland Age: 32 iTrader: (0)	I wanted them 8.5:1 C/R, 32mm compression height, with larger valve reliefs and moly coated skirt, I don' think there's a set matching that spec.
	626 '88 Wagon, turbo 2.0 DOHC My vBGarage My ride at CarDomain

4-18-08, 5:54	#29 (permalink)
fredio54 Join Date: Aug 2004 Location: Auckland, New Zealand iTrader: (1)	Don't forget to post pics! :-)
	DIYEFI.org - TRUE DIY engine management Mazda FE3/FE-DOHC Master Index Thread (work in progress) Mazda truck with FE-DOHC/FE3 "BIG like your house" Holset Turbo drinking 2.2 litres of fuel per minute ~= 385hp crank RIP SleepCounter :-( we will miss you! - RIP fredio54 :-( will we miss you?