KA24DE

I've never seen a graph besides his first one, have you? Again, show me a dyno of high compression pistons on their own making power on pump gas.

e30cabrio

iTrader: (30)

I just did, they both have posted graphs. Granted the threads are long and it's hard to graze through it and find a specific thing but it is there. You want more do your own work.

In the mean time this is all totally ot.

Sorry for feeding the troll Mr. Coupe.

KA24DE

No you didn't, what you did was link me through Adams build thread and told me "the answer is somewhere in there" when I've read through the thread many times. There is no Piston only dyno in there, or in here. Admit that so we can move on.

e30cabrio

iTrader: (30)

The answer is there, apparently reading is hard for you. Interesting you are ignoring THIS THREAD!


I will take 5 minutes and look for the post in Adam's thread after that you are on your own.

Admit this thread contains higher compression and more power so we can move on.

e30cabrio

iTrader: (30)

In .20 seconds I come upon this:

So what does the motor build consist of:

Internals:

Weisco Pistons (.020 over stock)
Eagle rods
ARP rod bolts
Fully balanced and blueprinted - not only balanced as individual components, but also balanced as a rotating assembly
OE Nissan bearings
Full Ported and polished heads
5 angle valve job (stock Nissan valves)
Tomei 268 cams (268 duration, 10.5mm lift)
NISMO valvesprings
NISMO headgaskets
Lots of time spent porting stock, non rev up lower plenum -we logged over 100 hours between the heads and plenum, going off recommendations from MCR Japan, as well as things we found on our own.
Motordyne 1/4 inch spacer
ATI crank pulley
New: water pump, rev up oil pump, idler pullies (OEM)

Final Compression checked in at 11.3:1

e30cabrio

iTrader: (30)

I doubt Adam is making up his power but did not see the sheet I was certain was there so I posted this:

https://my350z.com/forum/9335957-post1150.html

Happy?

KA24DE

This discussion is becoming redundant, this information has been covered before. One thing I love is reading the technical aspect of how and why

"I've been seeing 0.7-0.8psi of vacuum in the intake manifold, which translates to about 10-15whp from my small experience with tuning turbo 350s - typically 1psi equals about 15-20whp. "

"What we're looking at here is an engine that can develop 100-130whp MORE than factory with only a cam, intake and exhaust tuning. This is no surprise however because the factory heads really are fantastic, the valves are big, the bore is big, the stroke it small... i mean it really is an awesome engine."
https://my350z.com/forum/7596996-post1.html

mgrotel

iTrader: (3)

we are debating whether added compression makes more power? come on man, that is a proven fact. yes, the increases are diminishing as you get higher in the compression ratios, but the fact is that more compression = hp, period.

KA24DE

Read the bold my friend. BOLD.

KA24DE

"Well you guys would be amazed, the higher compression pistons yielded absolutely no gains what-so-ever. Infact, the dyno plot basically was a carbon copy of what it was with the stock engine."

https://my350z.com/forum/8382568-post26.html

Would you look at that....

mgrotel

iTrader: (3)

ok, so what is the best NA manifold?

e30cabrio

iTrader: (30)

I have seen that thread and asked SG about it. That was 6+ months ago still no response.

I have an MREV2 with spacer and had it port matched to my ported and smoothed lower plenum so I did what I could there. I agree breathing is important but if you are rebuilding a motor and spending a bunch of money why scrimp?


My build started as a little refresh because I have a 30k oil consumer (started at 18k) as it was 6k out of warranty (motor 2) Nissan said 0well.

Little by little I got batter parts, then there was a crank in the classifieds for 1800 and all hell broke loose. It is now almost a year later and the motor is still at a shop waiting to be assembled. I will post graphs someday far far in the future when the motor is finally in the car and ready to be tuned & dynoed.

KA24DE

"We just finished modifying this upper plenum which found some extra power, comparable to the carbotron intake. Car is now making 331whp, the hood closes and it has a throttle body - unlike some of our other tests! So this is legit horsepower, although I was wishing with the compression I would be at 340whp by now."

https://my350z.com/forum/8686389-post38.html

Stop acting like I'm not on your side, I'm trying to help. You are acting like a child who covers his ears and yells so they can't hear what you're saying. Listen, read and be open to ideas. You don't know it all, and neither do I, but I want to learn.

e30cabrio

iTrader: (30)

Read the bold my friend, the bold.....

e30cabrio

iTrader: (30)

Are you kidding?

I never said intake mods don't make power, you are saying compression does not. Are you talking to yourself with that child remark?

I agree the intake is the bottleneck. I asked SG about theirs before I bought the MREV they never responded.

I never said I know everything, I will say loudly I know very little. It seems you are insisting something and refuse to see any other point of view.

mgrotel

iTrader: (3)

that is very interesting, could there have been other factors causing that? i know 10.3 to 11 is minimal, but the compression ratio to power relationship is well documented and not a new concept.

http://blogs.hotrod.com/hot-rodengine-tech-122.html

KA24DE

Probably because of the (stock)head.

e30cabrio

iTrader: (30)

I also have to wonder about 100% identical graphs. As a rule there is a +- factor on any given day on the same dyno with an unchanged motor let alone one that has had mods done.

I also need to ask are you calling Adam's numbers into question? I really doubt he is making any claims he can't back up.

mgrotel

iTrader: (3)

if sg does not produce a plen, then what is the best one to get ka24de?

mgrotel

iTrader: (3)

so you say that higher compression pistons and headwork is not necessary on an na build, but then you think the compression bump isnt adding power because the head is stock? im confused