porting plates

[Jason]

Hey guys, I'm just getting into porting and I had a couple of questions. Would it help if porting plates were bolted to a part and torqued down before porting? I guess you would call them porting plates, kind of how a deck plate is used when boring a block to simulate the cylinder head bolted in place. Has anyone tried this, or does anyone think it would be completely unnecessary?

[86rocco1]

Not necessary. A deck plate is required when boring a block because of the high level of precision that's required. That level of precision simply isn't required for porting and unless you're porting with a cnc machine, would be impossible to achieve.

[Jason]

OK, I just didn't know if it would help or not, thanks for the reply. I'm trying to learn as much as possible, so I'll probably have a lot of dumb questions

[86rocco1]

[bruce]

I think this might be application dependent, I had a Tecumseh OHV single cylinder engine for one of my tractors that needed a torque plate installed when I machined the seats. If I machined the seats without the torque plate I could never get the seats to seal once it was installed on the block.

This was before I had a flowbench, would it be a problem flowing without the torque plate? Probably not for the level of flow I look at, but it was a problem once the head was installed on the block. You have to look at your own testing practices and the level you need or want to take your flow to. Are you going to be looking for .5cfm or 1cfm? Personally in my level of testing on my own parts I'm looking for changes at 1-2 cfm and then it's more about flow quality with the velocity probe. The velocity probe has added another tool to use on the bench.

As your testing/knowledge improves you can up your level, as the old saying goes; walk before you run . . .

[Jason]

[larrycavan]

Jason,

In case you haven't found this one yet

[Jason]