20v head in 4ac block??? its posible?

[BETOBMA3]

hello, im beto from argentina, i´ve got the only ae86 in my country, is a sr5. (1984)

I want to know if it posible to put into the 4ac block, a 20v head, with pistons of 20v, with my crank and conecting rods (4ac)
Its posible??

i wish to buy a 4age20v complete, but here its imposible, this engine doesnt exist.

thanks, and sorry for my english,

beto

[banpei]

Well, both engines are A series, so the head fits... I know 16v heads have been put on 20v bottoms, however I wouldn't put a 20v on a non 20v bottom: the 20v has some differences in holes for oil transportation so you would be blocking a few of them...

You can see the differences on the head gaskets:

top one is 20v and bottom one is 16v.

But that's only my opinion from a theoretical point of view...

[BETOBMA3]

thanks for the info!

yeah, but if i change the gasket and put a 20v gasket?

i think if in the age 16v you can put a 20v head, in my sr5 too. I saw in forums a 4ac with a 16v head and fits ok

i found a picture of one 20v block, and i compare with my 4ac block, looks the same!!

wat you think?¿ im crazy? jeje

every hole are in the same place

[tolisspi]

Interesting project!
But is the block of the 4ac good to keep with safety the power of 20v?

[BETOBMA3]

jaja thanks, i want to use my ae86 only the weekends, no for racing in a circuit, i want to acelerate sometimes, supouse 1, 2 3 gear, i dont know, i think this can be done!!

well, first i must buy the head, this is a problem too jaja, in argentina my ae86 is the only! je, im crazy, but ive got FE

well, wen the project stars i must upload the process

thanks, and sorry again for my english

few pictures of my sr5:

[Chrisso]

Toymods has a number of threads about putting a 20v head on an older block. The 4ac and 4age blocks are identical apart from number of support ribs and oil squirters, neither of which will affect what you're trying to do.

Chris

[banpei]

Wow! Amazing amount of rust! I almost dare not to ask about the state of the floorpan!

To answer your question: yes most holes are there and some of the 20v holes are wider. It would work of course, but don't expect wonders from the engine.

[BETOBMA3]

thanks for the info guys, and yes, the car is bad condition, but is the only in my country jjajaja, was this sr5 or nothing jajaj

now i made a complete overhaling , in a few months he come back from the deads! with panda colors!

[mc68]

keep in mind 4ac's have a weaker crank. and have only 6 bolt flywheels, instead on 8.

dont rev it tooo hard

[JonnyAE86]

Dont do it mate. t crank design is not the same, its weaker, same as rods and pistons.