Author Topic: Synsg piston seal  (Read 859 times)

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Offline Gambo

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Re: Synsg piston seal
« Reply #10 on: January 03, 2018, 09:14:54 PM »
Yep, that's the pukka one sven. 8)

Yes, please keep us informed and up to date, as it'll be interesting to hear of your findings with the SYNSG

Online Baggawind

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Re: Synsg piston seal
« Reply #11 on: January 08, 2018, 10:18:13 AM »
So I haven't buggered up then! Sweet!

Thanks guys!

How'd your Aussie seal fit, did you need to size it at all or just bang it in?
I bunged mine into a cup of hot water for a few minutes then smeared it with a little silicone oil before pressing it on. I also had to size  it a little as it was quite a tight fit from new.

Offline svendogg

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Re: Synsg piston seal
« Reply #12 on: January 09, 2018, 08:56:06 AM »
How'd you go about sizing it? And how do you guage if it's too tight?

Online Baggawind

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Re: Synsg piston seal
« Reply #13 on: January 09, 2018, 10:54:42 AM »
I,m fortunate in having a lathe in which i can hold the piston. I spin it up then use various grades of wet and dry to reduce the seal diameter. As for fit, it,s all down to feel. Hard to explain really but i like to make it a not too light push fit. Some people like to make them just tight enough to bear the weight of the piston , spring and guides when held upright. Personally, I don,t think that allows for eventual wear so I make them slightly tighter. Remember, you can take it off but can,t put it back on

Offline seagate

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Re: Synsg piston seal
« Reply #14 on: January 09, 2018, 06:28:19 PM »
If you've no lathe , you can can get by using a drill clamped in a vice.
I plink , therefore I am.

Offline Gambo

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Re: Synsg piston seal
« Reply #15 on: January 09, 2018, 08:53:10 PM »
I,m fortunate in having a lathe in which i can hold the piston. I spin it up then use various grades of wet and dry to reduce the seal diameter. As for fit, it,s all down to feel. Hard to explain really but i like to make it a not too light push fit. Some people like to make them just tight enough to bear the weight of the piston , spring and guides when held upright. Personally, I don,t think that allows for eventual wear so I make them slightly tighter. Remember, you can take it off but can,t put it back on

A very well known tuner uses this technique.....

The piston and resized seal should stay stationary in an empty upturned cylinder when the transfer port is blocked off with a finger. Then, when the finger is removed the piston should drop.

This sounds like the seal may end up too loose...........but the seal expands when under pressure whilst compressing the air, making the prefect fit. :)

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Re: Synsg piston seal
« Reply #16 on: January 10, 2018, 10:24:02 AM »
Yes, I forgot to mention the finger bit. ::) :-[

Offline Gambo

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Re: Synsg piston seal
« Reply #17 on: January 10, 2018, 07:37:40 PM »
Yeah.....and I meant to say the perfect fit....not prefect fit!!! Doh!! ::)