bore out a silver top

[GTCRSHR]

i did a quick search but couldnt pin point anything

so just a quick question ....

has any one done it ? is it possible ? is it WORTH doing ?

whats the advantages and dis advantages of doing it ?

or has toyota taken this as far as its likely to go ?

cheers

[Mr Revhead]

theres 0.5mm pistons avail from toyota

as to what the max you can safely bore it.... im not sure

[pidge]

(over simplified)
Get a 7afe block and conrods and swap it for you 4a block and conrods.

1800cc-ish - and can be turboed with lower compression pistons (e.g. 4agze pistons)

[Otomo]

(over simplified)
Get a 7afe block and conrods and swap it for you 4a block and conrods.

1800cc-ish - and can be turboed with lower compression pistons (e.g. 4agze pistons)

Yeah, but the issue here would be what ECU to use. Or you'd have to map an aftermarket ECU for this.

[pidge]

(over simplified)
Get a 7afe block and conrods and swap it for you 4a block and conrods.

1800cc-ish - and can be turboed with lower compression pistons (e.g. 4agze pistons)

Yeah, but the issue here would be what ECU to use. Or you'd have to map an aftermarket ECU for this.

Like I said, over simplified. Somebody has done a turbo 20V 7AGE IIRC (search!)

Keep in mind, modifying a car == $$$$, one way or another. A previous poster has pointed out that 0.5mm overbore is the most you would manage on the 4A block, which would give you about 15cc more overall (whopdedo). Other options are a 3SGE ("straightforward" from the point of view of engine stuff, but potential cert problems due to the engine mounts) transplant or a 7AGE (I don't think it would need different engine mounts (both a "A" blocks, but you'd need to sort out an ECU).

And in both cases you would have insurance hassles.

Want more grunt that a 20V 4AGE? Go get a 3SGE powered Curren / EXIV / Altezza etc - or a Caldina GT.

A Golden grule of car modification is to not waste time and money "upgrading" a down-spec car to a high spec car (e.g. Levin SJ modded up to a Levin GT Apex - buying the GT Apex will be a lot less pain, time and money). You just end up with a certification and insurance headaches. All you would get with buying the higher spec level car is insurance headaches - but less that that of a modded car.

Another example is the Impreza WRX to STI. Save your pennies and buy the STI. At least you won't be going through the Upgrade/raise boost on turbos, blow clutch, upgrade clutch, blow Gearbox or diff. Rinse, repeat.

An exception to this would be for a classic car (e.g. AE82/85/86) where it is not feasible to get your hands on an original example any more, and you are prepared to spend the $$$ to bolt the upspec bits onto the common body.

Trust me, be there, made that $15000 mistake, OK?

[RedMist]

Actually you can quite comfortably take the cylinders to 82.5mm. Wiseco make an 83mm piston, however its known to take the inter cylinder wall to the maximum. Some won't run pistons of that size because of the wall issue.

But yes, it is expensive, and doesnt wield fantastic results. If you are after a maximum cc size in a class then it's worth it. Much as my 1625cc 4age is at the class limit.

[Lloyd]

As above, standard is 81 and you can go safely about 1.5mm oversize before things start getting too think in the walls. Not much point really as you'll only pick up a little in displacement. You'll see how thin the walls would get once you get the head off

Going 0.5mm oversize I think I picked up 20-odd ccs

[GTCRSHR]

So basically to get the best out of the 4AGE series ....


it would be best to make a 7A-GE out of the 7A-FE + 4A-GE

is this the general concensus ?

if so ....

whats the next step for that engine to get really decent figures out of it

and roughly what sort of horse power would the 1st step and then making mods would people achieve

(this Thread could go in the stickey or the questions part maybe ?)

[Silent Knight]

(this Thread could go in the stickey or the questions part maybe ?)

Why?...nothing of relevance has been mentioned yet...

[GTCRSHR]

The fact most people want to get the most out of a 4A-GE

and if this is one of the ways to get the most out of it then surly it would help new comers / people looking for information about how to

maybe if some one has knowledge / some one that has done it before if they could put up what they have found would be benificial ?


if not then no problems

[Silent Knight]

Tried using the 'Search' button for info on how to get the most out of your 4AGE?

That is without a doubt the engine range (Blue, Red, Silver, Black) wich has been covored the most out of anything else in the tech section on this board.

[GTCRSHR]

fair enough doesnt worry me either way

back on topic

[spencer]

You cant really say a 7age is the way to get the best out of a 4age its all specific to what you want it for.

[GTCRSHR]

Theres only so much you can get out of a 1600 4A-GE


if you want serious power then theres no replace ment for displacement

[Punter]

Theres only so much you can get out of a 1600 4A-GE

How much are you after???

With a turbo 180-200wkw is possible. You really want more than that?

[spencer]

You still have to use the 7a crank and rods, the crank has only 6 bolts for the flywheel and the rods are not as strong as smallport, silvertop etc rods. As said above 200kw with a turbo can be done relatively easy without going to the 7a setup. There is some good info on club4ag about the 7age setup pros/cons look at them before saying the 7age is the best 4age setup