Just like the title says, if you do/have done your own porting on an M44, would you have a port form or model you'd be willing to share? Pre porting obviously. Tried the old interweb, but I don't see anything.
cheers
iain
cheers
iain
Anyone do their own porting? Port form available?
- Thread starter IainP
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I've ported a few engines. The last time was one of my Escort van cylinder heads. It made quite a difference.
I did it all by eye, so each port would have been different.
I've never seen a port form (other than a hand-drawn idea of the final result), but I've read that you can use CNC to port. Is that what you mean?
I did it all by eye, so each port would have been different.
I've never seen a port form (other than a hand-drawn idea of the final result), but I've read that you can use CNC to port. Is that what you mean?
It's a silicone mould of the port Pingu, kind of like this, from google images:
they can be joined up to give this sort of thing:
Very useful for visualisation, particularly if you only only plan on doing minor porting, as I'm going to do with mine.. Mine needs a head gasket, so I'll skim it and relap the valves, may as well to a minor tidy up around the throats.
I figured I'd be lazy and ask if someone had such a thing before I go ahead and make one.
I'll post pics once done, I may be able to produce a .stl file of at least the throats, will see.
iain
they can be joined up to give this sort of thing:
Very useful for visualisation, particularly if you only only plan on doing minor porting, as I'm going to do with mine.. Mine needs a head gasket, so I'll skim it and relap the valves, may as well to a minor tidy up around the throats.
I figured I'd be lazy and ask if someone had such a thing before I go ahead and make one.
I'll post pics once done, I may be able to produce a .stl file of at least the throats, will see.
iain
Why not just polish the ports like we did in the good old days and see how it turns out. I know it's not just a simple matter of smoothing the rough castings but it's the easiest way to start. Don't forget to do the exhaust ports too. On normal car engines it's a lot of work for very little, if any noticeable gain, apart from the self satisfaction that you've done it.
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When I rebuilt Lynne's m44 last year I did do a bit of remodeling just smoothed everything I could get to in the inlet and exhaust sides of the head ground down any casting edges.
Removed all the valves as well for full decoke and lapped back in time seats again .
But like Garry has said all done by eye .
Removed all the valves as well for full decoke and lapped back in time seats again .
But like Garry has said all done by eye .
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I'll be interested in the .stl files as I have a 3D printer.
Would a female version of the mould not be more useful, as that is what you are trying to copy?
I've read that CNC machines can be used to accurately copy the shape of the mould, but I've never seen it done. I suspect that it would only be high level engine builders (such as F1) that would do it.
When I used to do it on Mini engines we knew where the oil and water ports were and knew what parts of the head to attack and wheat parts to leave alone. We knew this because the heads were freely available and could be sliced to have a good look inside.
I'd recommend you can get hold of a 2nd hand head and cut it up to take a good look inside. It will show you the oil and water galleries as well as the OEM throat shapes. You will be able to see and mark out the areas that can be removed.
I didn't have access to a flowbench when I was doing it and just did what I thought was right. If I were to do it again, I'd use a flow bench to check that the cylinder head flow was balanced. I think that balancing the flow is more beneficial than just having more flow through each valve.
There are some very good books on the subject and I've spent a lot of time reading them.
Good luck, have fun and enjoy the results...
Here's a link to my Youtube videos. None of them are specifically about porting, but you can see that there is not much that I've not had a go at.
Would a female version of the mould not be more useful, as that is what you are trying to copy?
I've read that CNC machines can be used to accurately copy the shape of the mould, but I've never seen it done. I suspect that it would only be high level engine builders (such as F1) that would do it.
When I used to do it on Mini engines we knew where the oil and water ports were and knew what parts of the head to attack and wheat parts to leave alone. We knew this because the heads were freely available and could be sliced to have a good look inside.
I'd recommend you can get hold of a 2nd hand head and cut it up to take a good look inside. It will show you the oil and water galleries as well as the OEM throat shapes. You will be able to see and mark out the areas that can be removed.
I didn't have access to a flowbench when I was doing it and just did what I thought was right. If I were to do it again, I'd use a flow bench to check that the cylinder head flow was balanced. I think that balancing the flow is more beneficial than just having more flow through each valve.
There are some very good books on the subject and I've spent a lot of time reading them.
Good luck, have fun and enjoy the results...
Here's a link to my Youtube videos. None of them are specifically about porting, but you can see that there is not much that I've not had a go at.
This should be your motto @Pingu
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My latest tattoo = Lots of mistakes, but no regrets
