[RowanMR2]

Hi All

I have the ability to go smallport (92 Corolla) for not so very expensive in my opinion. What I have now is a very reliable and pretty fast MAP-sensored 1986 largeport engine.

The smallport has about 75-80k Miles
The largeport has about 100k Miles

The smallport comes from another MK1 but the front end has been totalled. I can get it with the gearbox, axles, manifolds, accesoires and electrics + ecu. I've read that I should use the 86 Largeport cams because they're more aggresive but I don't know if this counts for the 89+ 4age's aswell?? Should I put the smallport head onto the 1986 engine or just use the 92 engine?? What else should I use and consider to swap?

I can also get a set of double Solex carbs with 4AGE adapter plate for about $200..

What do you guys suggest, what would be the best setup? And would it be worth it comparing it with the noticable gains?

Thanks in advance for helping me with this decision!

Kind regards, Rowan

 

[ITA-MR2]

Dunn'o anything about the smallport cams, but the '87< cams were very slightly more aggressive than the >'88's.

 

[BRANDO0o0O]

Small port cams are less agressive.. I've heard they're good turbo cams..

Brando

 

[kameleon]

I have a smallport... once I get it done I will be using my 85 cams as they are better for NA power. I personally would just use the whole 92 motor and tranny in your 86.

 

[kirkosaurus]

small port with '86 cams.
Keep it EFI unless you have alot of time and money for carbies. You'll be maintaining them all the time and you'll have to use a hybrid distributor.

 

[toymdngn]

smallport block, largeport head. thats what i would do if i wasnt (eventually) going with a 4agze.

 

[donalson]

eh... smallport head is where you get MOST of the benifits of going w/ teh small port... the additional compression won't do near what the beter head design will (much better air velocity)


mark

 

[TomsMR2]

20v or boost.. i wouldnt bother with 16v conversions, swaps, or hybrids.

 

[AlexMackay]

can someone explain the hybrid distributed further? are you just refering to using a MSD 6A box and a different coil? or is there something else?
Thanks

 

[RowanMR2]

Both 20v and boost are not in my budget OR availability the next few years, after that I will look into having a boosted engine and was thinking of beginning with a 4AGZE and turbo it. Until that I just want a bit more go and was thinking this might be a nice replacement until I can get boosted.

The way I look at it now is that the 86 cams will be the better, but what about the rest of the engine? I think the 92 will a 7-rib block, which is stronger but that makes it heavier aswell and only gives me more advantage when getting boosted, while the 86 is a 3-rib block which is lighter and maybe has more potential when going NA?

Besides that the 92 might have a knocksensor (don't know) that could come in handy for reliability, but maybe I can just swap that to the 86 engine and then use the 92 ECU with the smallport head and 86 cams on the 3-rib block..

Your opinion BS?? :bsflag:
You're the specialist of this part of the MK1 :smile:

 

[TomsMR2]

you could just do cams in your current motor..

are the gze and 20v swaps particularly expensive over there? i just noticed you're not in the US

 

[RowanMR2]

Well gze and 20v are very rare and hard to find on this side. That makes the price go boom, and that's why I'm attracted to this smallport offer. You even have to search very hard to find a smallport..

You're right though, I could just do the cams but I think that the price of the cams is almost the same as the price of this engine I came across. With the current euro-US$ valuta I think the whole engine is about $550 (E500), including everything mentioned above. That's an average price to pay for a 86 engine with about 100k miles on it. Besides that I will then have to remove the T-VIS system and fill up the holes of the assembly, or get an adapter plate. Otherwise the T-VIS valves will be limiting the intake velocity. Anyway I like to have more torque in low-rpm's.

The situation: My imported American MK1 has a nasty engine which needs to be replaced, and for that I've bought a very ugly European MK1 in which I'm driving now. I've bought it because the engine is in great shape so I could just swap them. But now there's this smallport and that could just add that extra go to the MK1. I can now go cheap and just swap the engines or do it a bit better and directly take the smallport.

I have already agreed on selling my ugly car to the smallport-owner as soon as my American baby has come alive again. He was also willing to trade the engine for the ugly car aswell, so then I will lose my current engine but I will get that better engine in return. I already have another parts car laying around in the garage.

I just don't know what to expect from the smallport and if it's worth all the extra or not.. And what the better option would be, smallport head with 86 engine or go 92 all the way. Using 86 cams for sure, but will check both cams to choose the best.

 

[RowanMR2]

Ok I have found out that it would be the best way to go Smallport parts all the way because of the oil lines, regarding to this thread:
http://www.mr2oc.com/showthread.php?t=36751&highlight=smallport

Then I will be using the <87 cams and maybe try which injectors I like best. I hope my exhaust still fits on the smallport header, and then it's about time to install the Apexi intake filter.

At this point I'm brainstorming if I should keep the ugly car and just buy the engine or simply trade the car for the engine.. When the engine has been swapped I can finally start to finish the rest of the car.

 

[Bill Strong]

The dream 4age N/A is a 1983-1986 block, forged crank and 10.5:1 compression lightweight forged pistons, lightweight flywheel and clutch.

Small port head topping off the lightweight bottom end using some street cams, D-Jetronic injection, custom 4:1 header.
Some thing like this would be in the 150hp area.

You will like the torque of the small port. It is a great engine. I have two of them and one hybrid.
You will be happy with the small port

 

[EnvyMyDrifts]

Bill, I am curious why you list the 3-rib block as being part of the dream NA 4AGE. I thought the 7-rib was always preferred due to it's increased strength. Can you explain your choice please? Thanks.

 

[kirkosaurus]

The reason Toyota went with the stronger block was because they were using the same one on their supercharged engines. The lighter 4A block with smaller internals is better for high revving and more power.

 

[mr2d2]

my 20v revved smoother and faster than my 85 3rib.... it really is a better motor in every way.. not to mention making more torque and more horsepower than all previous versions.. dont forget, you can add cams to 20v's too

nothing wrong with the smallport.. im sure it makes nice power, but its no 20v.

~tomsmr2.

 

[GinoX]

Terug naar jouw keuze. If I want to stay n/a, I, for one would go for the bigport shortblock just for the stock lighter internals (machined and balanced of course), bigport cams and the smallport head. They've been proven to withstand 160 wheel hp.

If in the FUTURE you want to go forced induction just stay smallport aal the way, with the bigport cams.