KL_ZE pistons

[pelado]

The only possible thing I could add to Dave's excellent (and lengthy) post on this subject is the consideration of heat input. Jacking up the compression via domed pistons or turbo/supercharging increases the heat load. Way back in '62 Oldsmobile turbocharged their 215 aluminum V-8 while using the standard four barrel carbureted version's compression ratio, about 10.5:1. This way they could achieve excellent low end throttle response as well as the passing power the turbo added. They did this by adding water injection. Aquamist seems to have a decent water injection system.<P>Turbocharged and supercharged engines usually use (not always) different pistons with thicker crowns to handle the higher compression pressures. The above mentioned '62 Olds had the same CR as the 4V engine but the pistons were unique with thicker crowns.<P>Any of the major piston manufacturers can make a custom piston for you. Just call Arias. Pick up a Hot Rod magazine for the advertisements and start calling around.<P>Like others have said, the only stock pistons are the KL-03 and the KL-ZE. I don't recall it being mentioned in this thread but the ZE's HP also comes from its cams which are more aggressive than the 03. Also, they may not be the most suitable cams for turbos. Turbo engines need less overlap than high HP normally aspirated engines. There is a lot to consider when turboing an engine that originally wasn't turboed, especially if you're going for all out HP.

[DriversClub]

Is Sean going to get his page running? I'd really like to talk to him about some of the things he had to do and problems he's had so far.<BR>DriversClub

[black92gs]

ok not to sound like an a-- or anything but have any of you ever driven an aftermarket turbo'd motor no i dont mean your moms dodge daytona or an eagle talon i mean something running over 10 psi of boost with ample other engine mods done? what the hell you need 200 horsepower for while driving around town or going to get your groceries is far beyond anything that i can imagine when do you need horsepower? in real life driving to pass someone on the highway in town street racing at the track etc. what do you do in any of these situations? put your foot the ground right? so what is so wrong with getting forged pistons at 8.5:1 and running on the street with 15 pounds of boost? well driving through town ..you save gas for one and with high boost numbers your going to amazingly suprise yourself when you do put your foot the the ground i just built a vw corrado for a friend of mine it was 8.0:1 compression with a ported polished head 3 angle valve job turbo cam nice grabby clutch etc. for a turbo we had a Garrett T3 offof a grand national the car had ample pickup from a rolling stop as soon as the boost gauge started climbing from 5 pounds to 10 the tires let go in 1st second and third gear yet the car is amazingly streetable for getting around town and picking up the girlfriend etc. turbo chargers probably are the best bang for the buck large performance upgrade because the power is always there when you need it it makes a cool sound B.O.V. are amazing theres no belt to break like there is with a s.c. and the bottle cant go empty like with NOS im short i think turbo'ing the ZE with the stock ZE pistons and stock ZE rods = Bad IDEA doing the 03 probably a much wiser choice if it was me i would be looking at slamming my compression and raising my boost...once you feel the difference you'll know why

[pelado]

Well go for it then and let us know how it turns out!!

[VizualXTC]

hmm, so the only problem with turbo charging the KL_ZE is breaking the pistons? Damn, why didn't I think about changing the pistons? Oh wait....that is exactly what this post is for. I was asking where to get new pistons, not trying to debate the pro's and con's of turbo charging the ZE engine. I am still planning on doing this, and it should be done by the end of next summer. I will let you all know how it goes. Even tho I'm not changing my mind, thanks for the feedback (even tho nobody really answered my question)

[Sonic]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by VizualXTC:<BR><STRONG>(even tho nobody really answered my question)</STRONG><HR></BLOCKQUOTE><P>I did. I said get US MX-6 pistons. Mazda OE... Then I said if you wanted lower compression you'd have to have them custom made.

[David Coleman]

Ask JG engine dynamics [powering 8 of the first 10 ten second hondas] why they use 11:1 Prelude engines @ 25psi. [img]shrug.gif"%20border="0[/img]<P>Granted, more boost will make more power, as boost increases mass flow of the engine. The point I was trying to raise was that the weak point is not preignition but lack of fuel, as @~90psi our injectors spray pattern goes to crap. Now, 90psi fuel pressure can be enough for 5psi on some Turbo'd KL's, and 10 on other Turbo'd KL's. Depends alot on the setup. I know of nobody who has blown a KL from pre ignition. Most blow them from running lean due to not enough fuel. FUEL AND IT'S CONTROL ARE KEY TO A SURVIVING TURBO-KL. Period.<P>This is why I'm such a huge proponent of Stand Alone Engine management systems on street cars. Being able to control fuel and ignition are key to having both good power output and reliability, as well as good gas milage and emissions. [img]shrug.gif"%20border="0[/img]

[black92gs]

like i said im new the the mx-3 market so im not fully aware of whats out there but with past experience from other cars ive always been able to find a pump and an injector to flow more fuel agreed fuel and its amount of flow are they key to the survival of ANY turbo motor like you said about the 11.5:1 honda engines at 25 psi ufailed to mention they run like 300 psi injectors i was talking about in street applications he is going to have to lower his compression ratio and convert to a stronger piston and rod combo <---question answered if he wants to run enough boost to make him happy because if he runs low boost numbers and high compression it will be less reliable and it definately wont put such a big smile on his face

[black92gs]

sorry questions not answered yet<BR>JE probably the most likely place to get them or go to some sort of mustang performance shop they have custom pistons being made constantly and probably will know a good place to get them definately go with a forged piston and some total seal rings its gonna get very hot in there with boost and trust me from experience you dont want to pull the heads off of your fresh turbo motor to find some of the things ive seen on motors that have been cheeped out on

[VizualXTC]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Sonic:<BR><STRONG><P>I did. I said get US MX-6 pistons. Mazda OE... Then I said if you wanted lower compression you'd have to have them custom made.</STRONG><HR></BLOCKQUOTE><P>Sorry man, forgot about your first post. My bad

[VizualXTC]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by David Coleman:<BR><STRONG>Ask JG engine dynamics [powering 8 of the first 10 ten second hondas] why they use 11:1 Prelude engines @ 25psi. [img]shrug.gif"%20border="0[/img]<P>Granted, more boost will make more power, as boost increases mass flow of the engine. The point I was trying to raise was that the weak point is not preignition but lack of fuel, as @~90psi our injectors spray pattern goes to crap. Now, 90psi fuel pressure can be enough for 5psi on some Turbo'd KL's, and 10 on other Turbo'd KL's. Depends alot on the setup. I know of nobody who has blown a KL from pre ignition. Most blow them from running lean due to not enough fuel. FUEL AND IT'S CONTROL ARE KEY TO A SURVIVING TURBO-KL. Period.<P>This is why I'm such a huge proponent of Stand Alone Engine management systems on street cars. Being able to control fuel and ignition are key to having both good power output and reliability, as well as good gas milage and emissions. [img]shrug.gif"%20border="0[/img]</STRONG><HR></BLOCKQUOTE><P>I have 2 questions about info in this particular post. What is a "Stand Alone Fuel Management System"? and what is wrong about getting better flowing injectors and pump like someone said?