Change valve/piston or engine?

[WESIDA]

alright so i came in here sometime ago about my 91 240 losing power. i found out either the last valve or the piston is not working right. misfiring everywhere. now my friend has an 89 240 engine. do you think its easier to just put the whole 89 engine on mine or just change the valves/pistons whichever one of them is owning me.

and also whats your opinion on supercharger or a turbo on a stock engine 240 engine. good idea?

Thanks in advanceMHB

[slydin'240]

My personal opinion would be change the valve or piston. But either way the motor has to come out.

And as for the turbo vs. supercharger - I would go with the turbo. I think the superchargers have been discussed and tured into a large thread. Check out the KA-T forum for more/better info.

Here's one link to turbo vs. supercharger zerothread?id=109424

[Dattebayo]

If you have overheated too much at any point, you may have a warped head.

But then again people tell me I have a warped head sometimes.

[nametakennow]

Small turbos make me happy... boost... responsive...

Mmmmm GT25 and 28... or the god... GT28RS...

::wipes drool from chin::

As far as fixing stuff, it's gonna be a pain anyway. I believe there's a problem though- he's SOHC, aren't '91s DOHC? Shouldn't be an issue if it's a piston, but the valves it might be. You don't want a downgrade, hope it's a piston or find a new DOHC... nothing against single cam, but it's just not the same.

[WESIDA]

Sweet. well i guess i'll go with the small turbo then. but iam considred on wither to put it on a stock engine or not. i don't wanna end up blowing the thing. i dont' have much to swap an engine. but most likley i will do it some point of time. but for now i need a nice boost.

what do you mean by a warped head(sorry iam anewibe dude). well i've been racing quite much . if it should help, when i drag race i rev the engine up to 4000rpm, then let go of the clutch. i feel the nice power of rear wheel drive when the car starts to fishtail then just flies its beatiful man. then after than i let the engine go to 6000 on each gear. i got a feeling iam gonna get flamed for this

and i hope its the pistons then, just out of curiousity what would happen if i use the old valve into the DOHC?

[Riceless]

well i've been racing quite much . if it should help, when i drag race i rev the engine up to 4000rpm, then let go of the clutch. i feel the nice power of rear wheel drive when the car starts to fishtail then just flies its beatiful man. then after than i let the engine go to 6000 on each gear. i got a feeling iam gonna get flamed for this

JK, at least it isn't a tale about racing mirages and civics...

[nametakennow]

4000rpm? Damn, I'd have wheelspin all over the place... BOTH of them (yummy LSD).

If you haven't properly warmed up or cooled off your engine after all that you could cause the head to disfigure from extreme heat without proper cool down.

The compression on KAs isn't such that a light turbo app is going to blow anything. I know that, at least for my SR20DE, I could run a good 16lbs of boost before things would get real hairy, but most people stick to 10-12psi on stock internals to prevent excess wear. I'd think a KA would be similar, but I'm sure the KA-T kids in that forum could tell you better.

Trust me, you won't be doing 4000rpm clutch dumps when you have boost unless you've got some drag slicks.

Haha, I'd like to see the remnants of a stock clutch that experienced that... lol.

[WESIDA]

4000rpm? Damn, I'd have wheelspin all over the place... BOTH of them (yummy LSD).

If you haven't properly warmed up or cooled off your engine after all that you could cause the head to disfigure from extreme heat without proper cool down.

The compression on KAs isn't such that a light turbo app is going to blow anything. I know that, at least for my SR20DE, I could run a good 16lbs of boost before things would get real hairy, but most people stick to 10-12psi on stock internals to prevent excess wear. I'd think a KA would be similar, but I'm sure the KA-T kids in that forum could tell you better.

Trust me, you won't be doing 4000rpm clutch dumps when you have boost unless you've got some drag slicks.

Haha, I'd like to see the remnants of a stock clutch that experienced that... lol.

hehe, as far as i know its a stage 3 clutch from what the pervious owner told me. now i can't wait till i fix the car and put the turbo in there. dumb question bros but here goes. is it possible to have a turbo and a supercharger at the same time

[nametakennow]

Yes, but it's beyond retarded.

Think about it, double the boost, sure, but it's not like your engine can handle that much pressure on stock internals (and you'd need MASSIVE injectors to feed the O2 coming in). PLUS it'd be amazingly expensive.

[WESIDA]

Yes, but it's beyond retarded.

Think about it, double the boost, sure, but it's not like your engine can handle that much pressure on stock internals (and you'd need MASSIVE injectors to feed the O2 coming in). PLUS it'd be amazingly expensive.

true man, but its just ona those thoughts u know. i bet somebody outthere did it . do you drag race man, if so do you have any tips??

[nametakennow]

It's been done on a few cars, actually. I want to say there was an R34 in Japan that was running both. I bet it was a clutch-type supercharger so that when the turbo kicked in the wimpy stuff could be shut off.

Me? No. The car is FWD and is, and will continue to be, a daily driver. I don't have the money for tires, safety equipment, etc. I'm looking in to autocross in the relatively near future, then moving on to track racing...

what I wouldn't give for a few laps at Road Atlanta, even in my car as is...

I'll be finishing this car up in the next year or two and then moving on to a strictly-track project from there. I have a monster list of stuff I want to get done first though- it's time to move up from beating riced out Civics, stock Sis and Spec Vs .

However, I can tell you that drag racing is simple to learn, but hard to master. It's all in getting the right jump- not only in a timing sense but also in making sure you don't burn layers of rubber off.

A pure drag car is a delicate thing, because there's the balance in making the car get off the line, but keep accelerating the whole race.

[WESIDA]

It's been done on a few cars, actually. I want to say there was an R34 in Japan that was running both. I bet it was a clutch-type supercharger so that when the turbo kicked in the wimpy stuff could be shut off.

Me? No. The car is FWD and is, and will continue to be, a daily driver. I don't have the money for tires, safety equipment, etc. I'm looking in to autocross in the relatively near future, then moving on to track racing...

what I wouldn't give for a few laps at Road Atlanta, even in my car as is...

I'll be finishing this car up in the next year or two and then moving on to a strictly-track project from there. I have a monster list of stuff I want to get done first though- it's time to move up from beating riced out Civics, stock Sis and Spec Vs .

However, I can tell you that drag racing is simple to learn, but hard to master. It's all in getting the right jump- not only in a timing sense but also in making sure you don't burn layers of rubber off.

A pure drag car is a delicate thing, because there's the balance in making the car get off the line, but keep accelerating the whole race.

Ya man, thats the thing. getting the car off very fast and smoothley without burning off tires(at least not that much) but i guess sloppy drag racing is alright if u know you'll burn the other car eitherway heres a picture of my car btw, except no more wing

[paemt6220]

when Supercharging and turboing and engine u would not get double the boost. the supercharger would make boost at low rpm until the turbo got spooled up. then u have to route the turbo air charge around the supercharger or have a clutch to disengage the supercharger. Mazda did it on the MR2 a while back. It had more gizmos and gadgits and things to F**k up than the FD's sequential turbo system(which is a lot if you no anything about them). Its a bunch of expensive crap just to get a little extra tourqe in the low end.

Go with a turbo like the GT28R(aka DISCO POTATO) and you can easily make 220-250hp at the wheels with only fuel system upgrades. And the best part is that turbo should make full boost at around 3000 rpm or maybe even less!!

[S12Nick]

boost it with turbo its just right superchargers belong on american crap

[nametakennow]

when Supercharging and turboing and engine u would not get double the boost. the supercharger would make boost at low rpm until the turbo got spooled up. then u have to route the turbo air charge around the supercharger or have a clutch to disengage the supercharger. Mazda did it on the MR2 a while back. It had more gizmos and gadgits and things to F**k up than the FD's sequential turbo system(which is a lot if you no anything about them). Its a bunch of expensive crap just to get a little extra tourqe in the low end.

Go with a turbo like the GT28R(aka DISCO POTATO) and you can easily make 220-250hp at the wheels with only fuel system upgrades. And the best part is that turbo should make full boost at around 3000 rpm or maybe even less!!

If you'd read my later post you'd have noticed that I mentioned that cars that do have both must use something like a clutch-type supercharger to switch between the two. That's because you'd overboost and blow stuff up without it.

A well tuned GT28RS could make good boost at very low RPMS. No fuel system upgrades? My ***. Any turbo setup is going to require a change in injectors in order to perform much unless the KA has some quite nicely sized ones. I'll be running a GT25 in the near future and I'll be getting probably 370cc injectors on my SR20DE to support 10-12psi.

The benefits of a low-boost app come in price, intercooler options (can run small FMIC, SMIC, or TMIC), response, and the lack of a need for a new ECU, since you can use an SAFC to adjust because the needs will be +-50%or less.

[StatixNWH]

wow....

[WESIDA]

well bad news guys. the guys checked on the car and i found out i need to change the head cyllinder and one of the calves, the valve is cracked/has a hole. they told me parts+labor will be 1700 bucks. pretyy fukin gay. they said the job will take 17 hrs. they guyover there said honsltey the car is not worth it. i don't know though i need my 240. everything is good except that little fukin valve, and it has 130k miles. what do you think i should do guys. I have another 240engine in my garage but its a single cam, my original is double so i don't know if that makes a diffrence. can i just take the parts out of it and have one of my cheap friends do it? or go a head and get done in the butt at the mechanic with 1700???

[Dookie]

when Supercharging and turboing and engine u would not get double the boost. the supercharger would make boost at low rpm until the turbo got spooled up. then u have to route the turbo air charge around the supercharger or have a clutch to disengage the supercharger. Mazda did it on the MR2 a while back. It had more gizmos and gadgits and things to F**k up than the FD's sequential turbo system(which is a lot if you no anything about them). Its a bunch of expensive crap just to get a little extra tourqe in the low end.

Toyota made the MR2

[Florida240sx]

For $300 more you can a built ka24de from BD.You can get about an 80k motor for about $700.Also there is tons of ka24de's out there people are trying to get rid of.However I can't find them.

[Ni2s4s0aSnX]

losing horsepower? it could be low compression in one of the cylinders caused by a cracked piston or ring, so yeah replace the engine.

[s13sr20chris]

if you are a noob...

DONT GO BUILDING A MOTOR!

i swear i mean good things by this warning!

try just swapping one first. save the old one. do some bolt ons and maybe that turbo idea. building motors are for people who are not afraid to get in over their heads, people who do it all the time, or people with money to pay others to build the motor.

i just want to give you a fair warning because as soon as you pull that valve cover off you can start breaking things really fast. but dont get me wrong, you can cause problems just swapping her out too.

research, as you are doing now, is good.