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Old 12-09-18, 08:37 AM   #1
AndyMoran
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Default Petter cold start

I have a Petter S, 18-21HP, shipped to Australia in 1927. Not an easy engine to start and my experiments with making cold start fuses haven't been a great success. Does anyone have a supply of fuses or a recipe for making same. I have tried saturated solutions of saltpetre on flannelette, cardboard and rope. The much smaller fuses, made with cotton sash cord, work well in my Petter Atomic two cylinder but the fuse holder in the S type is huge in comparison.
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Old 12-09-18, 12:02 PM   #2
Paul_Sterling
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Hi Andy,

I did have some at one point, but sold them on, as I preferred not to use them in the S-Type, as the carbon granules they spat out cause wear on the piston and bore. They are also an absolute PAIN to send by mail, and next to no courier will ship them (and yet fireworks get delivered ok?)

They are similar in behaviour to a Roman Candle firework, and were in fact made by a firework company.

Personally I would stick to using a blowlamp for starting, better for the engine.

I use Zundfix in the Atomics, but I don't think they are suitable for the S-Type, and are certainly a lot smaller than the starting cartridges. Saltpetre soaked blotting paper should work in theory, but I gather from other peoples attempts it doesn't work right on an S-type.

Paul.
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Old 19-09-18, 03:33 AM   #3
AndyMoran
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Thanks for that. I did some research and apparently a mixture of white sugar and potassium nitrate works better than straight potassium nitrate. I'll give that a go on boat caulking material. I find the blow lamps a problem when starting in the open on a windy day. i have made an air start valve and managed a start with that but needs some fine tuning yet.
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Old 20-09-18, 08:18 AM   #4
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Quote:
Originally Posted by AndyMoran View Post
Thanks for that. I did some research and apparently a mixture of white sugar and potassium nitrate works better than straight potassium nitrate. I'll give that a go on boat caulking material. I find the blow lamps a problem when starting in the open on a windy day. i have made an air start valve and managed a start with that but needs some fine tuning yet.
Hi Andy,

Yes I've had a couple of challenges trying to start on a windy day, but roped a volunteer in to hold a rag to keep the breeze off, a bigger shield that can protect the lamp and flame might be useful (i'm going to have a go at making one), as aside from anything else, if you run on a breezy day without load, they can cool down too much.

Paul.
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