Mind giving some knowledge about the pistons effectiveness on NA and turbo, and the benefactors? Rock?

 

Actually a benefactor would be someone who gives you money to complete a task/goal. The benefits of a the pistons are the ability to handle more detonation, e.g. higher boost levels in the car. Notice the thicker top ring than stock. It's not going to shear off under higher levels of boost that the stock ring would. On an NA car, you're not going to see much see they didn't raise the compression but if they are lighter, there may be some benefit in less reciprocating mass in the drivetrain.

 

Pistonscan be benefactors, i ask them to help me buy stuff all the time

 

Zah?

EDIT: Oh...nevermind. I get it. They'd be your benefactor if you died and left them your money. Anyway...this isn't a grammar thread, p!

 

Law of physics

Higher CR will need the piston head to be domed. Another way is to create a stroker kit, but the lancer's conrod is pretty long by itself. I can't imagine how much longer with forged parts.

Lower CR = higher boost at the price of some TQ

Higher CR = lower boost at the price of stratosphere topend speed.

Lighter internal parts doesn't necessarily mean more HP/TQ, unless under severe boosting levels.

EX: lightened flywheel does not create HP, but it does gives you the ability to rev faster towards whatever peak power. Another word, on a dyno, you will see some spikes than a normally broad and curvy powerband.

Forged pistons on just normal I/E won't do much. If you totally don't maintain the engine via neglect, the forged pistons will survive all the wear and tear on the block after 100K mileage.

Forged pistons will do great under NOS. NOS, under severe lean condition, will punch a hole through the piston head, crack cyl head, or sear off spark plugs to be rattling and burning in the combution chamber. Basicaly, the motor waves a white flag.

Under heavy TC load, forged pistons will survive at the cost of snapping or bending conrods. Also, stock head gasket will blow (seen this on 3 ill-tuned TC mirage from 9:0.1 and 9.5:1 CR boosting around 13 psi). If you have forged conrods too with ARP head bolts, the next weakness is the connecting pins between the conrods and pistons (have seen this too).

As you upgrade under higher boost, stock parts will start to fail. TC has a knack of finding weakness during heavy, prolonged stress loads.

 

Bahamut saved me a lot of writing. Amen! Pistons solve the piston problem or weakness. I think pistons are the weakest part of Lancer motor. Head gasket seems sturdy. But as you boost more and more weaknesses will rear their ugly heads. I plan to run 10 psi with these pistons on good gas and see what happens.

ROAD/RACE
http://www.roadracemotorsports.com/

 

hey ROCK. say if i were to get new rods...how many psi could the new pistons take?

 

The head gaskets on these vehicles is a weak point as well we ahve found that on the 4G93 engines that they don't handle more than approx 12 psi.

WE have confirmed the fitment of our head gaskets and they fit perfect which also has the benefit of decompressing the motor at the same time. THe head gaskets are a competition gaskets rated to approx 20 psi so they would do the job fine but if you are going to get pistons you need to take this into account as the stock head gasket is around 0.030" thick, our 1st stage head gasket is 0.060" thick and our 2nd stage head gasket is 0.090" thick.

Great for a stock car the 2nd stage to decompress back to around 8.5 : 1. Note with the thicker gaskets you may also need a vernier cam gear to reset your cam timing otherwise you will have retarded valve timing.

The 2nd weakness in these motors will be the same as the 4G93 being the conrods don't go above 13 psi boost on them.

David THomas
www.rpw.com.au

 

so with the stage 2 gasket and forged pistons you could run 13 psi of boost and 20 psi if you had better conrods?

does anybody make better conrods?

would it be pretty safe to run like 12 psi with the stock rods, forged pistons and stage 2 gaskets?

thanks

 

Putting a decompress head gasket seems to me like the cheap way to go. Head gasket = piece of metal between bottom end and head. If you run high PSI with decompress head gasket and STOCK piston I think you would still blow **** up. I wouldn't feel safe with stock pistons above 10+ psi. Road/Race pistons would be the way to go Zlancer if you wanna run more boost. I dont know if u need rods though...Rob ?

 

Agree with Mitsman. 11-12 seems like the limit. However that is pretty good considering the compression ratio. That is making some good power.

ROAD/RACE
http://www.roadracemotorsports.com/

 

rob... connecting rods... available? or should i wait longer?