Z350Lover

iTrader: (2)

Hi Guys,

I am considering rebuilding my N/A motor again early next year and am wondering to know what rods should I use for the N/A application? I know I will need a lighter rods than stock items, but just don't know what brands to go for... and I am not going to rev up to 8K rpm, 7500rpm will be the max. that I would go for.

Also about the pistons too... I am looking for 11.5:1 or so compression ratio pistons to go into the engine too and which company should I contact for more information on the price and the specs? As I was told, I am only expecting to gain around 15rwKW (20rw HP) with those pistons and I am not expecting more than that.

thanks a lot of any input!

cheers,

richie

sentry65

iTrader: (11)

20rwhp? I thought going to 11.5 CR would net you around say 7-9rwhp or whatever about 2-3% would be?

failsafe306

iTrader: (38)

Are you doing cams and headwork too? What about engine management? I'd like to see a fully built n/a Z with a UTEC or similar controlling it all.

thawk408

iTrader: (16)

Do you think 12.0:1 is possible with use of 93? I have heard the Corillo A-beams and Eagle rods are ligther and stronger then stock.

thawk408

iTrader: (16)

Look in his sig. He has both.

failsafe306

iTrader: (38)

haha

thawk408

iTrader: (16)

I would think it would give atleast 20rwhp.

D350Z10

iTrader: (20)

Corillo Rods and CP Pistons 9.5:1 with Total Seal Piston Rings and ported heads! SLEEVE UR BLOCK... best performance

Zexy

iTrader: (55)

He's got a almost full Nismo S1 motor with Motec

I'd go with Carillo or any forged lightweight rod and 11:1 compression slugs. I'd also rebalance the botton end. Some headwork would be great too.

Zexy

iTrader: (55)

Nope.

Z350Lover

iTrader: (2)

Yes... I have a almost full Nismo S1 motor without the engine cover and instead of the nismo ecu, I use motec ecu... that's all...

What sort of head works are you talking about? Porting and polishing?

I was told that Nismo cylinder heads are not straight bolt-on items, and Jason from Performance said the standard heads are really good already... that's why I decided for higher CR pistons and rods (most likely Carillo rods since it is lighter than stock items)...

WHat should I look out for when I choose those pistons??? I think 11:1 or 11.5:1 is more than enough for this motor and getting out 20rwHP is the secondary aim for this project... I just want the motor to be strong with good balance and I can rev it without any worries. This is sort of like a personal achievement too.

cheers,

richie

g356gear

iTrader: (12)

N/A motor....read the post Sleeving is not necessary either...even for F/I.

Rickdogg

iTrader: (234)

Technosquare is flashing rev-up motors to have a rev limit of 7500 so hmmm

Z350Lover

iTrader: (2)

I don't worry too much about the rev limiter because I have got motec computer at the moment... I can set it anywhere I want it to be... it is at 7400rpm limiter and fuel cut at 7500rpm...

I really need to look into whether or not it is reliable to run higher compression with our engine and what sort of problems would I possibly have... and what parts/brands should I choose to go for with rods and pistons... heard that Eagle Rods are a bargain to go for... are they lighter than stock rods?

Thanks!

cheers,

richie

ReavTek

iTrader: (1)

I am also interested in learning what are the lightweights in the forged rod market for the Z. Z350Lover what do you think were the most essential upgrades for reliably revving to 7500RPM?

Z350Lover

iTrader: (2)

ReavTek:

I think it will be the rods for sure... my engine builder told me that our cranks are good for 7500rpm +... he even thinks that our standard rods with standard bolts are good for 7200rpm (I didn't even need those nismo bolts)... but with Nismo's rod bolts, they are just an extra step up to ensure that rods will not fall apart and therefore it is still good for 7500rpm... BUT a set of better rods will just give you a piece of mind at the rpm that high. Other than the rods/rod bolts, our engine should be good for 7500 rpm though(only if we are still making power up in that range)... e.g. as for my engine, the max power appears at 6500rpm with Nismo S1 cams and I doubt very much even with higher compression pistons, the max. figure will ever reach 7000rpm... I will be happy to see the max. power to be in between 6500 to 7000rpm and that's also why I don't need anywhere beyond 7500rpm...

To make more power out of this engine, my engine builder would really want to look at what he can do with the cylinder heads (I reckon I have enough power for the street already to be honest), but what I am really interested in is to build a reliable buttom end that can allow me to rev without me worrying to 7500rpm.

cheers,

richie

mchapman

iTrader: (1)

Hi Richie,

Good to see your still have plans for a built motor.

You should be able to get good gains from increasing compression as you've already taken care of most other areas of your motor and the rods will enable you to rev high reliably to make the most of your gains. One of the soon to be released intake manifolds should really benefit your setup as well as moving power up the rpm band. Your different cam durations are contributing to your broader less peaky power curve, if you went with the same cam duration intake and exhaust this would move your peak figure up the rpms but you would loose more bottom end giving you a less usable power band.

My requirements are slightly different to yours as I wanted NA power now but with the ability to add a couple turbos down the track. I ordered the new Eagle rods because they were h-beam design (strong for FI), 60-100g lighter than the Pauter(so I can use without performance loss while NA) and they are the best priced rod on the market for the 350z. I don’t believe the Eagle is lighter than the stock rod as it’s designed to handle FI with some people using them in motors over 800rwhp, I have the weight of the Eagle rods here somewhere. For your NA only requirement an h-beam wouldn’t be necessary so any of the lighter a-beams should be suitable. Carrillo make a light a-beam which fits your use.

For pistons again my requirements are different but I went with the Arias extreme duty pistons because of their beefier design but ordered them with a higher silicon content so they don’t need such large piston to wall clearances (potential piston slap) and don’t need warming up as much etc. I ordered them in a custom 10:1 compression ratio so I can run them in NA without loosing any noticeable power but still be in a better position for FI down the track. I think any of the high silicon pistons with a custom compression ratio or one of the NA designed pistons like the Esprit pistons would be suitable for your requirements. You will need to make sure that valve reliefs are cut into them and double check the valve clearance when they are in your motor as your cams have a lot of lift which could push a valve into the piston as soon as you turn the motor on.

Murray

islandsnow

iTrader: (6)

The current Option magazine Oct has a lot of VQ parts and articles of tuning the VQ from nismo, hks, central 20, power enterprise, amuse and other companies with modded Z's and show what parts they used to modify the engine. It's in japanese, but you can see the cams, con rods, pistons, turbos and stuff like that in some of the articles.

thawk408

iTrader: (16)

Just go with the AEBS 4.3 stroker and call it a day.

Z350Lover

iTrader: (2)

Murray:

Thanks for the advices on the piston selections... that really helps! I spoke to Nizmo Pete regarding to the rods and the pistons selections for this upcoming rebuild... he told me that carrillo rods are lighter than stock and that's what I need for the N/A application... and it so happened that he had a spare set (since he has gone for the 4.3L stroker kit already in his "VQ43"), so I bought it off him this arvo (after nagging him for a whole day, he kindly sold it to me)... so the rods are set (as long as it is lighter than stock rods, I don't mind if they are H or A beams)...

Right now... I gotta look into piston selections as they are more difficult to select than the rods in my case with higher lift cams (11.0mm)... more researches will need to be done from here... so if anyone knows any good piston brands out there in the market, please kindly advise!!! Thanks heaps!

islandsnow:

I will pay attention to the oct. option mag mate... thanks a lot for the info!!!

cheers,

richie