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A "Poppin" Question

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wagnmkr:
I was having a look through the Poppin  (Flame Gulper) plans and see that they call for a cast iron cylinder and a steel head.

Is there a special reason why the head has to be steel? Could it be cast iron as well?

Cheers,

Tom

b.lindsey:
Tom, I see no reason the head couldn't be cast iron also as long as it is machined smooth so that the valve flapper seats well against it.

Bill

fcheslop:
I used brass on my poppin and there's been no problems.Make the valve from 3thou feeler gauge stock as I found the 2thou tended to buckle.
I also added 1/32 to the cylinder length and made a spigot for the cylinder to locate into the frame other than that she is as per drawings and a good little runner.
Good luck with the build
cheers
frazer

b.lindsey:
Tom, though most I have talked to say the steel piston works well, I opted to make mine out of graphite...self lubricating is the main advantage of that.

Bill

wagnmkr:
Thank You for all the quick replies. I haven't started this yet as I am gathering material.

It is good to know there can be a bit of variance from the plans, and still get a runner.

Cheers, and Thanks Again.

Tom

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