Outer Limits 4x4 Board

Gday, just curious if anyone has done any porting work on TD 42 cylinder head and what the results were like. Cheers.

people have mentioned it before, the general thought at the time was waste of money

apparently the td42 heads have some very ordanary casting lips around the valves. This would have to hinder air flow especialy in N/A form but even turbo, porting would have to help a little. Head porting is not rocket sience and if i had my head off i would deffinantly clean up the ports especially around the valve area. Just a dremmel tool and a bit of time and paitence will do the job.
Dont know how much power gains are to be had thou.

Gudday

I had a head specialist port the inlet side and work the 'short side' of the inlet ports and valve entry into the combustion chamber. I did it because i had spent a heap of time fabricating extractors and wanted the full benefit of them.

There are obviously gains to be made from doing it but how much is only to be told by flow testing the head and how much horse power you are aiming for (200RWKW).
In my opinion it would be the last thing to do after you have done the mods that make 'significant' power gains, ie 12mm head/rotor pump mods, decent turbo/intercooler etc etc.
The head specialist reckoned the TD42 was pretty good to start with and the exhaust side wasn't worth touching - but improvements could easily be made on the inlet.

so in summing up the amount of cash spent (around 1.5k) is better spent elsewhere......first!

regards garth

Cheers, thats all i needed to know.

If you had the head off the the engine for repair you might consider it.
If you can do it your self and the head was already off, do it, it'lll cost you no extra.

But i wouldn't be taking the head off just to port it.

Head porting is worth while but only in the hands of people that know. Having it on a flow bench for before and after measurements would be a great way to prove results. I have seen and heard of many heads not working well because of grinding away material that should be there.

Also remember that boost pressure overcomes a lot of short falls in diesel engine design.

It will depend on your circumstances and the amount of money involved.



Andy

Dzltec wrote:Head porting is worth while but only in the hands of people that know. Having it on a flow bench for before and after measurements would be a great way to prove results. I have seen and heard of many heads not working well because of grinding away material that should be there.

Also remember that boost pressure overcomes a lot of short falls in diesel engine design.

It will depend on your circumstances and the amount of money involved.



Andy

very true. although given enough increase in port flow, more air will enter the cylinder for a given boost pressure.


You often find people that think porting is something anyone can do, have never been near a flow bench.

while we are on the inlet subject, has anyone got ideas/photos/designs of ideal improvements to TD42T plenum chamber to suit decent HP/boost?

if we dont get any takers i'll start another post.....

regards

garth wrote:while we are on the inlet subject, has anyone got ideas/photos/designs of ideal improvements to TD42T plenum chamber to suit decent HP/boost?

if we dont get any takers i'll start another post.....

regards

i havn't got any pics or seen any, but i have a few ideas that i've been trialing on some engine simulation software

garth wrote:while we are on the inlet subject, has anyone got ideas/photos/designs of ideal improvements to TD42T plenum chamber to suit decent HP/boost?

if we dont get any takers i'll start another post.....

regards

Here's an old pic when i was rebuilding my td42. I cut my intake up and made this.... looks a bit rough in this pic but dosnt look too bad all cleaned up now. i hope it will do the job, booked for dyno on Tuesday so will see what we can get

hey guys im new to diesels, rebuilding my new one at the moment, what is the idea of this mod? only for running high boost?

waandy wrote:hey guys im new to diesels, rebuilding my new one at the moment, what is the idea of this mod? only for running high boost?

Depends on how far you go rebuilding yours mate. A high boost high RPM TD42 starve of air when using the standard intake manifold, but this does not bother most people because most people don't make 200RWK good luck with ur rebuild, mine cost 20k with bolt ons.