OzVMX Forum

Clubroom => Tech Talk => Topic started by: Digga on March 02, 2015, 11:31:58 pm

Title: Base gasket
Post by: Digga on March 02, 2015, 11:31:58 pm

Whats the best way to fit the bottom gasket to prevent it sticking & tearing when you pull the barrel off again later? Coat the gasket in oil? grease? silicone?.......... ???

Is there a well proven secret method out there?

Title: Re: Base gasket
Post by: 80-85 husky on March 03, 2015, 10:25:19 am

that's up with the gods...how would mere mortals understand that?

Title: Re: Base gasket
Post by: FourstrokeForever on March 03, 2015, 11:15:09 am

Quote from: 80-85 husky on March 03, 2015, 10:25:19 am

that's up with the gods...how would mere mortals understand that?

Very true that..... Coating the gasket with anything is a bad move as it will first off give a false torque reading and then slowly but surely lose torque.

Title: Re: Base gasket
Post by: Lozza on March 03, 2015, 11:55:57 am

You can coat them with grease if you want to, especialy if the barrel will come off a few times in a race meeting. I found a gasket paper that would handle that called 'Sentinel' from an industrial gasket supplier. I used the same gasket for about 3 months compressed from 0.5mm to 0.45mm the first time I torqued it down and there it stayed

Title: Re: Base gasket
Post by: Tim754 on March 03, 2015, 12:09:46 pm

Try two or more gaskets, better still bite ya lip, buy new one and replace it each time ;)

That comes from a bloke that at present has   four  base gaskets on his four stroke sidecar engine. Why? It is one simple way to adjust the compression ratio to various fuels octane ratings. Before reassembly, calculate required compression (That is the very technical part of your engines components you have to study and learn) and fit required amount of gaskets allowing for crush / tensioning of course. At present I can run 100 to 106 octane unleaded or avgas , 91 octane pump stuff would  be (is..) crappy. The engine is so built and modified that one base gasket only, is the basis for methanol fuel.

Title: Re: Base gasket
Post by: Tim754 on March 03, 2015, 12:13:25 pm

Agreed ! Lozza has spiked my memory, Sentinel is the go for making your gaskets.

Title: Re: Base gasket
Post by: bigk on March 03, 2015, 01:06:28 pm

Get off the farm bikes & get a real bike & you won't have to worry about it. You know it's true......
K

Title: Re: Base gasket
Post by: Mike52 on March 03, 2015, 02:31:06 pm

Quote from: bigk on March 03, 2015, 01:06:28 pm

Get off the farm bikes & get a real bike & you won't have to worry about it. You know it's true......
K

;D ;D

Title: Re: Base gasket
Post by: Digga on March 03, 2015, 04:31:36 pm

Hmmm.......farm bikes, well I dont have a farm but the parts are generally inter-changebale with my chinese built lawn mower so thats got to be a good thing doesnt it  :o