Objective, 200hp with 4age.

[PatrickAE86]

for injectors you could use some supra MK3 non turbo.. (7MGE)

they ar 312cc; high impendance (good for stand alone) and straigt fit on bigport fuel system

and a question from my side...

what is the big difference between 40mm or 42mm crank ? do these 2mm add so much strength?

or is that because there no good rods available for de 40mm crank ?

[Uzelac]

I'm not engine builder, pretty much amateur, but what i've seen ITB's are a must for high end 4AGE. Plenum/airbox or not, your choice, but must have 4 blades.

Worth considering is two stage injection.
In total, ~350cc injector per cylinder will be enough even for 10 000 rpm and AFR below 12.

[bakonick]

speakin about rpm and etc
engines can go up in rpm bat to have power so hi up you need cams over 300 .
cams below 300 like the 288 i consider them for daily drive .
when you speak for race motor we always put cams more then 300.

[bakonick]

also the superteck parts are the worst you can install in your motor .
my personal opinion .
not so good company .
for good usa
try ferrea.
one of the best .
or toda or trd or some other japanese brand.

many times happen to us that supertech valves broke at the neck .
best that i try was the ferrea.

[4000GT]

Uzelac Wrote:15:1 compression ?!?!?!
What fuel do you use ?

Aviation fuel...

[4000GT]

Project D Wrote:

4000GT Wrote:15:1 compression

You mean 15 bar ? (wich should be around 13:1 CR)

15:1 static CR wit 288° cams, even with race fuel and retarded ignition, the only thing you will obtain is massive pre-ignition or detonation ...
(Even atlantic engine won't run so high CR)


For 200hp you have to use OS valve -> a complete kit cost around 1000€
You should also consider the machining (who cost a lot too)

(I'm currently building a 4AG for 190 / 200 hp)

Nope I mean 15:1 static compression.

With big cams the compression does bleed off, dynamic compression...

There is more timing that could be wound in with ethanol, which I may tune up on down the track.

[Project D]

PatrickAE86 Wrote:and a question from my side...

what is the big difference between 40mm or 42mm crank ? do these 2mm add so much strength?

or is that because there no good rods available for de 40mm crank ?

Well the biggest difference is the crank itself.
Since it isn't full counter(which generates a greater imbalance at high RPM), it is weaker than the 42mm (almost full counter)


Sadly their is no compagny who make forged full counter crank in 40mm + Forged conrod. (recently +EM have made conrods in 40/20)

On the other hand many compagny like Tomei, Tec Art's, Jun etc. offer full counter crank in 42mm and conrod.

[oldeskewltoy]

NoHachi Wrote:Can everyone also add a cost estimate and the number of KM's or Miles between rebuilds? I'm particularly interested in the latter.

3 oil changes, 5500 miles so far...no rebuilds... don't expect any.

[4000GT]

I have done 3 race meetings so far, still in one piece, its how life is spent in the 6-9k range.

[allencr]

oldeskewltoy Wrote:

NoHachi Wrote:Can everyone also add a cost estimate and the number of KM's or Miles between rebuilds? I'm particularly interested in the latter.

3 oil changes, 5500 miles so far...no rebuilds... don't expect any.

Not your daily beater, exquisite as it is, the Initial D 200hp9000rpm for the OP.