AE 101 - 111 ITB Question, please help

[ZDoman]

My friend started a big tune-up on his AE101 4AGE 20V engine and he asked me to put a question here.

He would like to buy an AE111 blacktop intake for the AE101 silvertop engine. The mounting bolts are on the same place? We know that the ports won't match, but its not a big problem.. It tried to find some photos but no one made me sure if its bolt on or not.

[86er]

found it on another forum originally from club4ag

Quote:Originally Posted by Mr.John
so as i pulled apart my new blacktop i couldnt beleive the differences between the silvertop. i could talk about it all day but pictures work best.






the first thing i noticed was the port sizes and the itb size, but the first really surprising thing i noticed was the cams. they have a severely lighted deadside and also a narrower contact area also.



heres them compared to the silvertop cams!




so after that i pulled the block apart and pulled the pistons off and weoghed everything. heres the results.


blacktop rod w/no bearings:



silvertop w/no bearings:



another silvertop rod i found that weighed different w/no bearings



silvertop piston w/rings:



blacktop piston w/rings:

[86er]

continued more info

Quote:check this out, the blacktop wrist pins are machined on the ends and weight less than the silvertop pins!

blacktop pin:



silvertop pin:



another thing i thought i would throw in is the difference between the 16v and 20v oil pumps. the 16v is on top:




from what ive found there where two versions of the silvertop. the early model had a different itb manifold and itake port shape. heres a pic of the old manifold:



heres the newer silvertop intake manifold:



and heres the blacktop, notice the very different shape. not as tall but much wider:



heres the measurements of the silvertop:



okay another big difference was the exhaust port size. the blacktop is just like taka said. 2mm larger than the silvertop:


silvertop:



blacktop:



okay. also another big change is the combustion chamber shape. the blacktop is very smooth with almost no place that can be called a "hot spot" or some place where detonation is likely to occur. the silvertop on the other hand has three protruding edges.

silvertop: the bottom of this chamber was also smothed out by me to try to remove the hot spot.

[86er]

continued again I removed last picture as it wasnt relevant and theres a limit per post

blacktop:




next theres the intake port. the silvertop is taller but not as wide. also down in the port the silvertop has almost nothing dividing the three valve ports. however the blacktop has three distinct runners seperating the valves. also the port is much wider.

silvertop:



blacktop:



heres a few pics with measurement:

blacktop:



silvertop:



well the last thing i can think of is the diameter of the throttle body inlet so heres the two:

blacktop:



silvertop:



oh one last thing i noticed, the blacktop has a mechanical timing belt tensioner where as the silvertop just has a spring and then is tightened down. heres a pic of the blacktop tensioner:



then a few more random pics:




um.. i didnt remove the cranks to weigh them but i might do it later. i dont think there is a differnce though. if you guys have any questions or want me to weigh/measure anything else let me know soon before the things back

[Ivan141]

Is it just me or are those "hot spots" he was machining away to avoid detonation actually the squish areas (which help avoid detonation).

[BenR]

There is so little quench in the 20v, and more importantly the piston doesnt make use of the avialabel quench, that it practically makes zero difference.

[Morten]

ZDoman Wrote:My friend started a big tune-up on his AE101 4AGE 20V engine and he asked me to put a question here.

He would like to buy an AE111 blacktop intake for the AE101 silvertop engine. The mounting bolts are on the same place? We know that the ports won't match, but its not a big problem.. It tried to find some photos but no one made me sure if its bolt on or not.

The itb's themself should bolt up nicely on the silvertop manifold. They will need at least some portmatching on the manifold side though.

If you need pics just let me know exactly what you want pics of and I'll get some for you :wink: (have both sets including manifolds lying in the basement)

[Morten]

The manifold side is the same bolt pattern, but the airhorn side has a slightly different bolt placement (close though). Here is a picture of blacktop gasket on silvertop itb (manifold side) to illustrate the difference. As you can see the bolts overlap nicely.

[domi]

A fairly quick and short offtopic:
On the last pic - that's the TPS on the left with the wires hanging, right?

[Morten]

Yes it is.