4ag 20valve article

[oldcorollas]

there is absolutely no doubt that is a KE20.

[old_school_jap1]

I knew it was a ke20!!! those intakes give it away. jebus u are a champ big_zop!!!

for those who read the article: wud there be any trouble with the way in which they drill the water jackets behind the rear cylinder??? ie.not enough cooling or circulation

[oldcorollas]

how to install a 20V in a RWD properly
with much thanks to Big Zop
please right click and save.

my hosting may not be available for very long, so can someone please host it, or upload to tech section of toymods?

[JustenGT8]

Not sure about the properly call....many ways to skin a cat just as valid. Good info for that way though.

[3sgte]

I have uploaded it.
It should be here:
http://www.3sgte.com/How_to_install_...m_properly.pdf
for a good while.

Disclaimer:
Drilling that hole in the back of the head changes the circulation of coolant in the engine.

I, and probably most others who might take on the swap, would probably feel more comfortable if they could see how this affects coolant circulation in the engine.

As an example, I know that the size of the coolant passages in the head gasket are determined by the direction the coolant is supplied in the original design. If this is changed, then there is a good chance that areas of the engine are being either overcooled or undercooled.

I am not saying it won't work, I am just suggesting caution.

If anyone has a series of good pictures of the coolant piping and routing for a 20V, I would appreciate a pointer to them. This has me curious now.

[old_school_jap1]

here's what i got of bill sherwood's site (god that site is great). its of a 16v 4age motor's water flow, but i don't think it would be any different for a 20v.



anybody reckon the flow would be affected if the afforementioned drilling took place???????

[3sgte]

This page here:
http://www.club4ag.com/faq%20and%20t...ject%2020V.htm

Shows pictures of the stock piping from the back of the waterpump.
This cooling system design appears to be similar to that used for the 1993 4A-FE as shown in the picture I have posted.


4AF-Cooling


Here is a 7AF HG


4A-GE headgaskets

(apologies to the original poster of the picture, I have forgotten its source) Note the differences in cooling system holes by the waterjacket near #1 cylinder and #4 cylinder.



If the headgasket on the motor is like the top one, then it just might do the trick. I wish I had the parts in front of me to let me trace the coolant flow.

[old_school_jap1]

bill sherwood's site has that same pic and says; "Head gaskets
RWD and FWD gaskets are the same, at least for the 16 valve versions. The 20v type may be different and I received a great photo of them from David Turner of New Zealand. In the photo you can clearly see the differences between the 20v at the top and the 16v at the bottom."

so therefore you believe that with the standard 20v headgasket that the flow will not be affected. correct???

[3sgte]

Oh, the flow will be affected; it will be altogether different. My expectation is that it should work.

Standard Disclaimer:
I really would like to look at the parts to confirm my thoughts.

If I were to do this to my own car, I would want to measure the temp in a few locations prior to modifying the cooling system, and then remeasure again later after making the modifications. My concern would be whether the head gasket needed any holes modified.

Obviously there will be spots running either hotter or cooler than intended, the question is whether it is tolerable.

I am a little concerned whether the bottom end at #4 would get enough coolant circulation.

[Sam_Q]

I have to ask why anyone would want to drill a small hole in the back of the head when you can just install a bypass plate?