how does higher compression raise oil pressure?

[602gsx]

I have an n/t block and it doesn't have oil squirters, I heard it would run fine because the higher compression raises oil pressure and that's why n/t blocks don't need oil squirters but I did hear the piston ring lands r very weak. Back to the question how does higher compression raise oil pressure?

 

[97spydergsx3]

the higher compresion isnt going to raise oil pressure. having no squirters is what gives you a little more oil pressure. the n/t blocks dont have squirters because the pistons dont get as hot as turbo pistons. are you putting a turbo on the n/t block? if so get forged pistons and rods if you plan on running turbo with no squirters.

 

[602gsx]

Oh! So that's the reason why they don't need squirters because it doesn't get as hot? And yeah I'm using a non turbo block,ima wait for the block to give out and then ima use forged pistons and rods.

 

[96 420a-t]

Just watch your egt's and you'll be fine. For dd applications u can boost a 420a.

 

[97spydergsx3]

Oh! So that's the reason why they don't need squirters because it doesn't get as hot? And yeah I'm using a non turbo block,ima wait for the block to give out and then ima use forged pistons and rods.

yes, since the stock parts arnt forged they use oil squirters to keep them cooler with the turbo. if they are forged, they can take alot more heat. how much boost are you running with the n/t pistons and rods?
i just deleated the oil squirters in my 7bolt split thrust block. i am running manley forged pistons and rods tho.

 

[602gsx]

I plan on boosting 15lbs. On 91. But after getting pistons,rods and the right fuel upgrades iplan on running e85 on 25-30lbs.

 

[97spydergsx3]

15psi is probley on the edge, i would run 10psi to be on the safe side with the n/t pistons. what turbo? also i might add that you can put oil squirters in your n/t block. if you look you can see were they go. all you have to do is drill and tap the right size hole and then install the oil squirters.

 

[602gsx]

Yeah 10lbs. Sounds a lot safer.adding oil squirters sounds like a good idea.any forums on how to? Ican just go to a junkyard and get the oil squirters off of them right? So is no oil squirters the only thing that makes non turbo block not boost-friendly?

 

[cyclonekid77]

You can't just buy squirters and pop them in. The block has to be drilled and tapped to accept the squirter on the NT block.

 

[97spydergsx3]

Yeah 10lbs. Sounds a lot safer.adding oil squirters sounds like a good idea.any forums on how to? Ican just go to a junkyard and get the oil squirters off of them right? So is no oil squirters the only thing that makes non turbo block not boost-friendly?

it really matters, if you run stock rods and pistons and daily drive this car, run squirters. if you have forged internals and this car is your "toy", run no squirters. or if you road race the car, run squirters with forged internals. i personally dont run squirters because i have a 7 bolt, and on the 7 bolt the oil squirters tap into the main bearings oil supply, i would rater have more oil pressure on the bearings then squirting oil on the bottom of the piston.
you can buy the oil squirters here EXTREME PSI : Your #1 Source for In Stock Performance Parts - OEM Cylinder Oil Jets (Squirter): Mitsubishi Eclipse 90-92 Early
and the bolts and washers here EXTREME PSI : Your #1 Source for In Stock Performance Parts - OEM Mitsubishi Oil Squirter Banjo Bolt (Check Valve): Mitsubishi Eclipse 90-94 (6-Bolt)

they are really easy to install, see were the alignment pin is on the squirters, there is allready that hole in the block. once alighned, you have to drill and tap for the bolt, that go's through the squirters.
what makes the stock n/t block and piston/rods not boost friendly is the higher compression ratio pistons. i think the n/t compression ratio is 9.5:1, the turbo 6 bolt is 7.8:1, the 7 bolt turbo block is 8.5:1. but the n/t and turbo blocks are just as strong. the pistons and rods are the weak part

 

[602gsx]

So if I add the oil squirters to my n/t block it'll b a lot more reliable? I just wanna daily drive. My friend is gonna do an balance shaft elim. U think that would be a good idea since the oil squirters are going to lower oil pressure?

 

[97spydergsx3]

i wouldent add the squirters, but if you are keeping your oem rods and pistons for a good bit of time, i would add them. you dont want to end up with melted pistons. also with eliminating the balance shafts, if you have the squirters, some times the tube to the squirters can break off. (i guess because of more vibrations) i dropped the pan to my friends talon, and two of the tubes were laying in the pan. i wouldent be concerned about the slight drop in oil pressure with the squirters. the 6 bolt squirters take thier oil supply from the oil galley. not from the mains like the 2g 7 bolts.

 

[602gsx]

I think I'm just gonna put oil squirters and eliminate the balance shaft and baby the motor till it gives out. and buy forged pistons and rods then take out the squirters. But I think I want to keep the compression at 9.0:1 if I buy forged pistons.

 

[96 420a-t]

If you add the sqirters your pressure would drop. But when you do the b/s delete it raises your pressure so you should be ok there.

 

[602gsx]

I doubt the vibration is enough to make the oil squirters fall off but does sound like its deff. Possible. Ithink id b okay for a few thousand miles haha

 

[97spydergsx3]

really the squirters arnt that big of a deal, i wouldent drill them for the squirters now, and then later plug the holes back up. just keep you boost around 10psi and watch you exaust temps and you will be ok. with the 9:1 cr pistons you arnt going to be able to boost that high. 30psi tops without race gas or ethonol. most high horse power guys are running 8.5:1 or lower.
rule of thumb
higher compresion pistons= more power with less boost
lower comppresion pistions= less power at the same boost level, but you can run more boost

what fuel do you plan on using with the 9:1 cr pistons?

 

[602gsx]

Yeah I thought it would be too much of a hassle to drill them then plug them back up. Iplan on using e85 I know someone with a setup like that. Ill just eliminate the b/s and boost 10 abd try to baby it.

 

[97spydergsx3]

you should be ok at 10 psi if you baby it, just try not to send a rod thru your block
you will be good on with 9:1 with e85

I doubt the vibration is enough to make the oil squirters fall off but does sound like its deff. Possible. Ithink id b okay for a few thousand miles haha

the squirter it self doent fall out, the tube on the squirter does

 

[doubleclutch99]

The rods are the same as a turbo motor so no worries there. but the pistons are the weak link because of the ring lands and combined with the lack of cooling on the bottom of the pistons.

 

[602gsx]

So there's no need for forged rods? Well I know it'd be better with the rods but I'm tight with money so if I can get a hold on just forged pistons that would be pretty much the samething as a turbo block or at least as reliable as a turbo block,right?

 

[KaLo_o]

just get a turbo block from a junk yard or a friend of a friend of yours and have it rebuilt.... holly smokes

 

[98spydereugene]

There aren't any additional vibrations without a balance shaft by the way, just more felt...if your oil squirters broke off, there were prior or existing problems with them to begin with...just my 2 cents...good luck with it I love turbo'd 420a's..

 

[602gsx]

if im gonna rebuild it then why not this n/t block? ill just put forged pistons,new rings and new main bearings..

 

[JayRome]

i have had a supercharged (dead stock bottom end) n/t on 10psi daily for over a year and currently have a high compression n/t on 1bar boost as a daily for the past 1 and a half years, no problems at all....

no squirters, no balance shafts..

id say it came down to the tuning... you can still melt forgies with a bad tune, they are only as strong as the tune backing them up.......

 

[602gsx]

yeah im definately gonna get it tuned. tuning is a must,to me.