Mi-16 Fanimold Reangling.

[kyepan 291]

Hi there

 

I would like to understand what's involved in cutting and re-angling a standard mi-16 exhaust manifold. If any specific bits are cut, and where / what angles they are changed to.

 

Many thanks.

J

 

Ps, have been PM'ing miles, and he is reluctant to take on the work of re-angling because there is little profit to be made on the time spent, when 4-2-1 are available off the shelf at a healthy profit for no time spent, which i can understand. reason for the ps, is i did a search previously and found that people were being pointed at miles.

[kyepan 291]

Hi there

 

I would like to understand what's involved in cutting and re-angling a standard mi-16 exhaust manifold. If any specific bits are cut, and where / what angles they are changed to.

 

Many thanks.

J

 

Ps, have been PM'ing miles, and he is reluctant to take on the work of re-angling because there is little profit to be made on the time spent, when 4-2-1 are available off the shelf at a healthy profit for no time spent, which i can understand. reason for the ps, is i did a search previously and found that people were being pointed at miles.

 

 

just found this from peter t

 

I'm a wedge man. With tapered washers, new studs, new cone nuts and the correct goo, it will seal perfectly and last indefinitely. It's just too much mucking around cutting and shutting the standard manifold.

 

If you want more power than the standard manifold can deliver, than go extractors.

 

To answer your question, you need to find 6 degrees.

[Baz 421]

Had enough of the maniblow then?

 

I was going to say 6deg. rings a bell, although probably not easy to keep exactly to that!

 

Basically cut into the pipes from the under-side, but not all the way through so leaving around 90d of each pipe un-cut then bend them downwards and re-weld. The result is usually about right, i know a few others use this method with good results too. But, there's the risk of the heat deforming the flange so it may need re-skimming flat again.

 

Is anyone still offering wedge plates? -A better option IMO, bar the fact that there's then double the amount of surfaces to seal.

[Vili 18]

. But, there's the risk of the heat deforming the flange so it may need re-skimming flat again.

 

 

I've found that skimming is not nessary. The manifold bolts have plenty of hold to thighten the twisted flange back straight again. The exhaust manifold heats up hot enough in use to relieve all the stress. In fact only couple hundred celsius is enough.

I've made two exhaust manifolds and both were twisted almost 10mm. After few weeks of everyday driving both flanges were dead straight when taken off from car.

[jackherer 543]

That is 100% correct, I made the mistake of having a twisted manifold skimmed several years ago because I was worried it wouldn't seal but I should have left it well alone, it just resulted in a flange of unequal thickness.

 

Saying that I have had good results with wedges on a few different 205s so I would always go down that route in future (if they are still available.)