4age parts interchangeability

[YeMs]

hey dudes, had a search but couldnt really come up with much.

any way issue is the crank in the bluetop on josephs ke30 is abit passed it. and finding another in decent condition seems abit of a mission as this seems to be a common problem (from the engine reconditioners mouth.. due to lack of servicing on older vehicles)

however iv heard a rumour that the steel cranks in the silver top 4age fit into the older blocks.. any truth in this?

also how about fitting a blue top head onto a silver top short block? iv heard of people doing the opposite (20v head to a older block) but for simplicity of just bolting the exsisting blue top head we have onto a silver top block it would be very easy.. so we dont have to $&#$% around with sensors/ecu blah blah and of course dont wanna have to hack up the firewall to fit the dizzy on.

so 2 basic questions, will the steel crank rods and pistons out of a 20v fit into a bluetop block?

or will the blue top head fit onto the silver top short block?

[Bling]

Cranks are all the same amount 4ages so will be fine to fit the 20v crank in.

I think the blocks are the same too, so you should be able to fit whichever bluetop parts in you wish. Probably best to just swap the pistons tho (20v pistons wouldn't go well with 16v head) and keep the less km internals of the silvertop in place.

thats from what i've read anyways, someone will have done it and will post

[no_8wire]

Cranks are all the same amount 4ages so will be fine to fit the 20v crank in.

I think the blocks are the same too, so you should be able to fit whichever bluetop parts in you wish. Probably best to just swap the pistons tho (20v pistons wouldn't go well with 16v head) and keep the less km internals of the silvertop in place.

thats from what i've read anyways, someone will have done it and will post

CAST HIM IN TO THE FIRE PIT!

No you cant use silvertop bottom end in a bluetop...as it is 42mm to the bluetop 40mm for the big end.


Bluetop pistons have a smaller pin as well, 18mm instead of 20mm

[YeMs]

oh i see.. how about fitting the bluetop 16v head onto the 20v short block?

[ChaosAD]

I did that with later model 16v pistons, as no8 wire says, the bluetop pistons wont fit. Think ive heard of people using 20v pistons with 16v head but dont know how well it would work

[Bling]

meh its what a read on here, you go jump in the pit

my bad.

[Mr Revhead]

you can use the later crank in the bluetop
BUT you need to use the later rods and pistons as well.

it would seem 20v pistons do work in a 16v

[YeMs]

yeh thats what ive been told. use the 20v crank rods and pistons and your away.

however the question still stands. can u bolt up a 16v head to a 20v block (with the 20v bottom end remaning)?

[ChaosAD]

Will bolt up no worries, may have to check valve clearances with the pistons though

[Mr Revhead]

well, seeing as 20v pistons work with 16v head
and you can bolt a 20v head to a 16v block
i see no reason a 20v block cant work with a 16v head
use the gasket to suit the head, and double check all the water/oil passages match up properly

[ChaosAD]

Will bolt up no worries, may have to check valve clearances with the pistons though

[3T-Rona]

Well it works, silvertop bottom end, 16v blue top bigport head and away we go, did have a problem with the fuel pump relay but its algd now.
Whats the deal with TVIS? whoever put the motor in had it fixed open so i just removed the sandwhich plate altogether, as i havent had much 4age driving experience how does this change the way the engine acts? also when setting the dizzy timing do i need to jump any of the pins in the diagnostic port, if so which ones would they be at the ecu as the diagnostic wiring is gone........ cue spooky music :d cheers all

[l1ttle_d3vil]

also when setting the dizzy timing do i need to jump any of the pins in the diagnostic port, if so which ones would they be at the ecu as the diagnostic wiring is gone........ cue spooky music :d cheers all

you referring to the black diagnostics box? if its a genuine rwd loom it probably wont have one, all old rwd 4age looms i've seen have a yellow 2 wire plug which is the diagnostics plug. it will have a brown wire and a blue/white wire iirc, just short the two terminals on that plug and its in diagnostics mode. the plug will be over by the dizzy end of the loom.

[matt dunn]

Whats the deal with TVIS? whoever put the motor in had it fixed open so i just removed the sandwhich plate altogether, as i havent had much 4age driving experience how does this change the way the engine acts?

If its a Bluetop Bigport, which it probably is, then it makes a huge difference to low end power, they are pretty gutless without it.

you referring to the black diagnostics box? if its a genuine rwd loom it probably wont have one, all old rwd 4age looms i've seen have a yellow 2 wire plug which is the diagnostics plug. it will have a brown wire and a blue/white wire iirc, just short the two terminals on that plug and its in diagnostics mode. the plug will be over by the dizzy end of the loom.

The late model facelift AE86's did have the square type diagnosis plug,

and they are just as the loom comes out from the firewall, near the wiper motor and a/c pipes, not near the dist.

[KinLoud]

When you short the plug to do the timing make VERY sure that the throttle if fully closed - the throttle position switch/sensor will detect even a small opening of the throttle and make it impossible to set the timing correctly (been there, done that!)

Ken
Ham
021 408 863

[3T-Rona]

yeh some junior has done some loom 'tidying' can i just earth the diagnostic wire at the ecu?
yeh i have noticed its a lil boggy down low, oh well maybe ill put it bak on at some stage, how should the vaccum hoses on the tvis solenoid be hooked up?

[l1ttle_d3vil]

...and they are just as the loom comes out from the firewall, near the wiper motor and a/c pipes, not near the dist.

all the square diagnostics plugs i've seen have been by the firewall, but all the round yellow plugs have been right next to the distributor plug.

i'll get some pics of the tvis hoses later and post them up.

[3T-Rona]

all gd got it bak on and sorted, its still no race rocket but it definaley goes better

[3T-Rona]

still trying to sort out the timing, need to get it into diagnostic mode to set it properly but my butchered loom laxks the plug...... i know that the diagnostic wire is the red w white, no.17 in the 18p plug (via club4ag) but have had no luck with earthing it out, revs dnt change, still can't set timing properly, ive found the plug that im guessing is the diag plug in the box of assorted stuff's that came with the car i.e butchered loom, it has a red w white wire (diag) brown wire (earth) black w red (tvis) and a green, am i supposed to be jumping the red w white to the green wire maybe ????? help please peoples
0276973722 is my number if any one wants to txt me the answer so i can sort it b4 i leave work this arvo, cheers ladies

[Mr Revhead]

When you short the plug to do the timing make VERY sure that the throttle if fully closed - the throttle position switch/sensor will detect even a small opening of the throttle and make it impossible to set the timing correctly (been there, done that!)

Ken
Ham
021 408 863

have you double checked the above