20v crank timing gear

[grantobius]

l was just stripping my blacktop 20v and craked my cranl timing gear. l was wondering if 16v are the same???

Any help would be much appreciated

[Sprinter86]

yep the same as 16v mate.

[Jonny Rochester]

Blacktop one is slightly different. The teeth are a different profile for a different belt.

13521-16060

[Sprinter86]

i was thinking of my silvertop one. mah bad!

[grantobius]

well l will be running a 16v belt becasue l am doing a 7age conversion, would l be best of gettin a 16v gear

[DX20VT]

The teeth profile make no difference, I have run ST and BT on a 16V belt,

BUT, the TDC markings on the BT and the rest are different,
so if you use a BT cam drive without the BT oil pump, your cam timing markings are out.
The actual timing is the same,
but the dot on the pulley on a BT drive is between two teeth, and on the rest it is right on a tooth.

[Delazy]

The teeth profile make no difference, I have run ST and BT on a 16V belt,

BUT, the TDC markings on the BT and the rest are different,
so if you use a BT cam drive without the BT oil pump, your cam timing markings are out.
The actual timing is the same,
but the dot on the pulley on a BT drive is between two teeth, and on the rest it is right on a tooth.

being that his doing a 20v 7age he'll have other timing issues to worry about aswell, so they wont make all that much difference

[DX20VT]

being that his doing a 20v 7age he'll have other timing issues to worry about aswell, so they wont make all that much difference

Well since I also used my one's on a 7AGE 20V, I can tell you that it does make the difference,
between putting it all together and everything lining up perfect,
and puting it together and the timing being a complete mystery.

[Grant #2]

To get out of Grantobious' thread,

It seems like I'm hearing that a 7age block with BT head, oil pump, tensioner, timing gear will actually line up the cam gears with a standard 16V timing belt?? Any need to modify the tensioner?

Also, would the compression ratio become too high for pump gas if the BT pistons were used as well? I don't know where this conversion puts the pistons when at TDC but the extra stroke should increase compression ratio.

Any thoughts? This is hella awesome if it really that simple. (Any ideas where I'm from?)

[Sam-Q]

compression ratio will be a theoretical 12.1:1 which is ok with a good tune or else just go with the silvertop pistons

[H8CHIR6KU]

The teeth profile make no difference, I have run ST and BT on a 16V belt,

with the 4age belt there are actually 2 belts. there is a squarish toothed belt and a round toothed belt. all you need to do is make sure that the teeth are the same shape and that when you turn the motor over by hand that everything still lines up to make sure the number of teeth is correct.

i know this because i had trouble with toyota galleria for ages over this. first they sent me a 7afe belt cause they didnt believe the ae101 from japan had a 20valve 4age (even though they had the model and frame number) then they sent a 4age belt which was different tooth shape and then i finally got the right belt from city toyota who also confirmed that they had a listing on 2 different belts

[grantobius]

all my timing marks lined up perfect, l spun the motor and double check etc etc.but my head was shaved and block decked to bring pistons to tdc