4AGE 16-20v Mods/Interchangeable parts

[fixeruperer]

carbs and manifold have shorter runners, the carby manifold will run a bit cooler and has proper velocity stacks.

[trdee]

My 1987 AE86 came with a 7 rib block, and 40mm internals......

interesting. late 86 early 87 is when the 7 rib was phased in, could be you got a bitsa from the factory? it's been known to happen with models where the changeover ones had a bit of series 1 and series 2 components, not hard to stretch that to engines...

Either way the toyota EPC shows the part number for the crank is the same for all 7 rib blocks (bigport, smallport, silvertop, blacktop etc) so unless you happen to be especially lucky, as OST seems to be here, then you can generally take it as a pretty decent rule of thumb to follow.

[Hiro]

carbs and manifold have shorter runners, the carby manifold will run a bit cooler and has proper velocity stacks.

Nothing a set of ITBs wouldn't solve...

[fixeruperer]

yeh but that wasnt in the swap.

[Hiro]

yeh but that wasnt in the swap.

I know, just pointing out that you could get most of the benefits of going to carbs whilst still keeping the best bits of EFI, and probably with less hassle and cost too

[celicaJZ]

well.... just to be a PITA...... and to prove that information accuracy isn't always what we are told......

My 1987 AE86 came with a 7 rib block, and 40mm internals....

Oh and it was the original engine... you see it had the VIN tag riveted to the block




Oh... silvertop pistons are pretty crappy overall, pop a set of smallport pistons in, do a bit of porting, cut the head about .020"(1/2mm) and you are good to go....

Thanks bro for the advice.. i'll take note of that .020"(1/2mm).. problem now is sourcing out for sp piston set and also will i still be using my stock crank assembly?

[celicaJZ]

carbs and manifold have shorter runners, the carby manifold will run a bit cooler and has proper velocity stacks.

is this based on experience?

[celicaJZ]

flywheel fit's straight on if you have the matching clutch.

You will probably not gain that much of a compression ratio raise with the 20V pistons due to the fact that the silvertop chamber is smaller.

Besides if you have a bigport none of this stuff would fit as it has a different crank

no wondering why my XTD stage3 clutch kit wont fit with the stock 16v BP flywheel. but it say's in the package that it's for 1.6 1994 corolla

here's the actual image:



so with the blacktop or silvertop flywheel, this clutch will fit in? as well as with the stock 4AC tranny?

[oldeskewltoy]

interesting. late 86 early 87 is when the 7 rib was phased in, could be you got a bitsa from the factory?

Feb 1987 was the build date. I no longer own that car... and even if I did, that was the original engine... I swapped it out for a silvertop, with 16V high comp pistons, a mild set of cams and the rest was rwd AFM TVIS. I had her for over 10 years. Anyway, the original engine was sold off as my wife and I decided to move west. So my original 7 rib with 40/18 internals is somewhere on the east coast of the USA

[fixeruperer]

is this based on experience?

yes, but my experience wasnt with the 4ag.

[celicaJZ]

yes, but my experience wasnt with the 4ag.

so you think there's more gain and in power and acceleration if i switch to carbs? 45 webers.

[fixeruperer]

the top end will benefit but is it worth it ? i dont know.

[trdee]

it will be slower pretty much everywhere compared to a good efi setup with ITBs and ram tubes etc

[Sam_Q]

celicaJZ: that's probably for a 212mm flywheel when you have a 200mm. A smallport or 20v flywheel is what I am guessing you need. Measure the diameter of the friction surface

[fixeruperer]

oh im sorry, i must of missed the part when he said he has a good efi sytem with tuned length runners and ram tubes.
oh he didnt ? anything else you wanna add ?