Some of you may know in the 4AFC engine there is a short bit of piping going from the top of the heat shield over the exhaust manifold, to the intake pipe. I have done a bit of research and found out what this pipe does. It's designed for the colder European climates, because the weather can be so cold, the engine would struggle to warm up. Getting that extra bit of heat from the exhaust and warming up the air going into the engine helps the engine to warm up.

 

I've come to the conclusion that Melbourne doesn't get THAT cold, so when I get my AE92 in the next few weeks, I would like to remove this pipe, and plug up the hole left in the intake. Looking for advice from anyone else who has removed this pipe, were there any problems you incurred? Does the engine run differently on cold starts? Is it a fairly easy and straight forward process?

 

Thanks in advance for your help.

Luke.

You wont have any drama's, I can't remember exactly but i gather this pipe goes to the inlet before the air filter ?

yes, before the air filter. you wiould be able to pick it in this pic.

 

Ok.

 

You Corolla has a 6AFC, 1.4 litre 81hp engine.

 

Anyway find a bit aluminum pipe and replace the bit that has the hole in it for the heater pipe thing.

Most I've had have fallen off anyway :y:

 

You can just yank it off and it won't make a lick of difference... the engine side is only a cover that sits on the manifold to trap the warm air... and the intake side has a little flap inside that closes itself off at ambient temperatures above about 5 deg anyway.

I removed the one from the wifes seca and it took longer to warm up of a morning so i bought a new pipe.

Ok.

 

You Corolla has a 6AFC, 1.4 litre 81hp engine.

 

Anyway find a bit aluminum pipe and replace the bit that has the hole in it for the heater pipe thing.

that pic is not actually of the rolla's engine, just one i dug up somewhere else.

 

i noticed after i posted it the 6A on the engine sticker :y:

 

fairly similar despite the displacement difference, aren't they?

 

I removed the one from the wifes seca and it took longer to warm up of a morning so i bought a new pipe.

alright, i'll remove it and see how i go for a bit. if it's not heating up in the mornings, ill replace it ;)

 

thanks for the help so far.

infact, just looking at the 6A pic, when i saw the rolla the other night [i havent actually bought it yet, still in aunty's possesion] the pipe seemed quite a lot shorter. is the pipe on the 6A longer than the 4A, then?

Id say so as it runs thru the guard:

 

EDIT: I Thought he asked if the 6A pipe was shorter not longer, The 4AC intake pipe is longer.

 

Edited December 24, 200718 yr by Trev

Id say so as it runs thru the guard:

 

 

Thats a 4AC though, so it's non-crossflow. The 4AFC and 6AFC are crossflow, so the exhaust is on the other side of the engine to the intake.

Thats a 4AC though, so it's non-crossflow. The 4AFC and 6AFC are crossflow, so the exhaust is on the other side of the engine to the intake.

 

Whats your point?

ok, I'm not that good with identifying toyota engines, apart from the main ones [JZ, UZ etc.]

 

but is that picture trev posted a 4AFC? so that means the engine is actually a 6AFC in the rolla I'm getting...thnaks guys ;)

 

edit: just realised the picture posted is a single cam, :y:

 

with the TWIN CAM engines, are 4AFC and 6AFC very similar except for the 200cc displacement difference?

Edited December 24, 200718 yr by Luke

Thats a 4AC though, so it's non-crossflow. The 4AFC and 6AFC are crossflow, so the exhaust is on the other side of the engine to the intake.

plus, the 4AC is only SOHC, 4/6AFC are DOHC

Whats your point?

 

It means the heat-stove pipework is completely different

It means the heat-stove pipework is completely different

 

Still don't see your point, All i said was mine took longer to warm up but really all your saying is that the 4/6AFC would be worse as its further fom the carby itself.