4agte build

[tsoob]

I am half way through a 4agte build, i have a blue top big port from an early levin, im not sure but i think the compression on these is 8.0:1 does anyone know for sure, i am using a ht18 turbo with a microtech mt10 and intercooler from trade me and action dan manifold, tial external, has anyone done this before? what sort of power can i expect? any advice as i am fairly green and would like to know if there are any major potholes to avoid i have spen hours reading through the forums and the only major thing i have seen is sometimes a problem with the oil return blowing smoke. Also does anyone know some one in the auckland area who can tune a microtech? Thanks
Nick

[~SlideWays~]

Bluetop is 9.4:1 compression.

The 8:0 you are thinking of is the early 4agze, which is a completely different ball game.

All of you questions have been answered in previous discussions.

Only downfall to your engine base is that the rods/crank are weaker than any other 4age (except blacktop) and that the pistons are not forged. You should see 150kw+ easy but will need aftermarket ecu and lots of fuel.

Another thing to watch out for is that oil drain back in bigports is hopeless. But should be fine for a street car.

[flygt4]

4agte suff has been covered into the ground on these forums. its hardly trailblazing stuff.

i'm pretty sure the only engines with compression that low were 4agze ones, you''ll probly find yours is somewhere up around 9.5-10.

you could probly make up to 170kw kw with that turbo but end power is dependent on tuning and having enough fuel to run the boost required. if you have standard bluetop pistons you won't be able to to run enough boost reliably to make that power, youll probly be more likely to be around 110-130kw.

you didnt mention larger injectors or fuel pumps either. probly be a good idea.

hunt a bit more on these forums, you could write a novel with all the 4agte shit written on here.

[tsoob]

the motor is a blue top 4agze not 4age so there for the comp is lower? what sort of injectors and pump? i dont mean to be a pain in the ass its kinda hard to find the right info on here, although i do try, thanks

[~SlideWays~]

the motor is a blue top 4agze not 4age so there for the comp is lower? what sort of injectors and pump? i dont mean to be a pain in the buttocks its kinda hard to find the right info on here, although i do try, thanks

Ok when you said Bluetop, I though you meant the N/A 4age.

If it is a bigport and definitely a 4agze (does it have a CAS?) then it will be 8.0:1 compression. So can stuff millions of pounds boost into it

I used to run one of these (bigport/bluetop head and 8.0:1 comp) and made 149kw's (with Linkplus and GT28) on standard gze/GTZ injectors (365cc) and std GTZ pump. That was the limit of the fueling though.

[~SlideWays~]

Oh and the rods are massive in that version 4agze.

[tsoob]

not sure what cas is but it was a afm version with sc12 charger so it shuld run 14 -18 pounds reasonably well? ...

[tsoob]

do you think ill need more for street or jus go with the gze injectors and pump, thanks for your help btw

[flygt4]

you can run up to 25psi with correct fuelling and tuning
the gze bottom ends are pretty solid.

[~SlideWays~]

Standard gze injectors limit is around 150kw's or 200hp at the wheels. Plenty of options for larger ones though.

Btw, I was only running 13psi before the factory fueling was maxed.

CAS = Cam/Crank Angle Sensor (in place of distributor).

[soopachargen]

Another thing to watch out for is that oil drain back in bigports is hopeless. But should be fine for a street car.

slightly OT... but is this why i would have ended up with oil all through my intake and intercooler piping after a high revving uphill run in my sc14 gze??

[~SlideWays~]

Another thing to watch out for is that oil drain back in bigports is hopeless. But should be fine for a street car.

slightly OT... but is this why i would have ended up with oil all through my intake and intercooler piping after a high revving uphill run in my sc14 gze??

Most likely oil was pushed though the cam cover breather because couldn't drain back to sump fast enough, so yep. I half filled a 1L catch can with a 2 or 3, 15minute stints around manfield.

Thats the reason the later redtop/smallport having the external oil drain from the head.

[Caveman]

That bottom end will be very solid providing there are no cracks, bearings are decent and crank is straight.

You will probably want injectors bigger than 4agze to fuel a ht18 on anything above 1 bar boost. They are good turbos and have been proven well by lots of people on the forum (ezy10's builds a lot of them)

150kw+ easy

who are you going to get to do the tuning?

You run the 4agze and an extra injector but since you have aftermarket computer just get 4 VR4 injectors, 440cc each.

Smoke comes from bad turbo seals, bad oil return or non restricted oil feed. Make sure you use the appropriate size restrictor on the turbo feed.

[l1ttle_d3vil]

the motor is a blue top 4agze

didn't 4agze's only come out as redtops...?

[~SlideWays~]

the motor is a blue top 4agze

didn't 4agze's only come out as redtops...?

Up till about '89 they were bigports, like a bluetop. A redtop is a smallport which didn't start until 89ish...

[tsoob]

ok cool, im not sure who can tune it, i was led to belive the injecotrs were good for about 440cc i have seen a few people recomend from a supra injector one other thing im not to sure about is the oil feed/return what type of lines and pressure sould i expect to run through them? and where and how to feed water to the turbo? thanks

[flygt4]

to feed water to the turbo just tee off the heater lines. much easier if you have the turbos factory waterline fittings too. its not really critical tho to have it watercooled.

injectors are probly about 380-390cc i think.

[narlystarly]

Hey fool, Alistair here, give me a txt/call ill sort you out

0274647479

[tsoob]

yeah cool ill call you after 6pm u know some one to tune it? we almost got the motor ready to go back in.

[narlystarly]

Yeah dude, give me a buzz later.