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Rammie2000

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belgium

18th Apr, 2015 at 08:22:41am

So was reading the instructions from gaples but made me feel a bit confused... according to there chart i should mesure my ring gap with the ring 1 inch down the bore. And the gap should be bore×0.0055 inch... ( mild boost up to 15 lb using regulr fuels ) now in mm that makes 70.61mmx0.14mm ( yes i live in metric land) so 9.8854 mm!!?? I cant give those groves that much cant i?

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Rammie2000

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belgium

18th Apr, 2015 at 08:25:11am

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


stevieturbo

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Northern Ireland

18th Apr, 2015 at 08:48:57am



On 18th Apr, 2015 Rammie2000 said:
So was reading the instructions from gaples but made me feel a bit confused... according to there chart i should mesure my ring gap with the ring 1 inch down the bore. And the gap should be bore×0.0055 inch... ( mild boost up to 15 lb using regulr fuels ) now in mm that makes 70.61mmx0.14mm ( yes i live in metric land) so 9.8854 mm!!?? I cant give those groves that much cant i?


2.78" bore x 0.0055" = 0.0153"

That's about 0.39mm


As to why that doesnt seem to work out your way...not actually sure lol.

And always worth baring in mind...with gaps, bigger is always safer than too tight.

I just did mine and made the gaps massive lol

And have to say, compared to my old knackered engine, not a damn thing is coming out of the breathers.

Edited by stevieturbo on 18th Apr, 2015.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


Rammie2000

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belgium

18th Apr, 2015 at 09:06:11am

Okey verry strange indeed. Calculated in inch and then converted it and it maches your calcs... do it all in mm and it doesn't? ?? Mystery of math? But hey. Quick solution to my problem then. Thanks mate.

I was thinking of grabbing them between 2 wood bloks and use an fine iron fille to make them fit. Would that be okay?

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


stevieturbo

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Northern Ireland

18th Apr, 2015 at 09:10:26am

I've only ever just held then and filed them with a good file.

A friend uses a Dremel thingy. Just de-bur any edges with a small needle file or something though after.

It's a tedious process, hence I dont get worked up about going too big !

Some of mine must be an easy 10-15thou bigger than intended lol.

If it's stainless top, they are a little tougher to file, the iron rings are very soft though so material disappears quickly.

The less of the ring hanging out of whatever support you make for it, the better as it will file better.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


Rammie2000

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belgium

18th Apr, 2015 at 09:38:25am

Lol okey. Guess i always get to stressed about this things.

While on the na 1100 and 998 i didn't even bother to look at the gaps... and they run fine to.

Edited by Rammie2000 on 18th Apr, 2015.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


jbelanger

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Montreal, Canada

18th Apr, 2015 at 03:14:37pm

There's a hidden conversion in there because inch multiplied by inch does not result in an inch value.

So if you divide your 9.8854 by 25.4, you get the correct 0.39mm

http://www.jbperf.com/

Rammie2000

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belgium

18th Apr, 2015 at 04:56:47pm

Hm. Okey. Learning something every day. Thnx. My old man is a math lover.... lets see if he gets it right the first time round.. *happy*

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


jbelanger

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Montreal, Canada

18th Apr, 2015 at 05:05:28pm

Actually, the simpler way to see it is that 0.0055 is not an inch value but rather a ratio. So don't convert it to mm. You then simply multiply 70.61mm by 0.0055 to get the 0.39mm

http://www.jbperf.com/

Rammie2000

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belgium

18th Apr, 2015 at 07:23:58pm

Oh so the " doesn't mean inch? Okey nice. Thats the problem. Most probably learn inch and mm here we only use mm. I do try though. 😐

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Alex

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Woolavington, Zummerzet

20th Apr, 2015 at 04:19:52pm

" does mean inch, but as pointed out it is easier to use it as a ratio.

Metric is for people who can't do fractions.

Rammie2000

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belgium

20th Apr, 2015 at 05:11:29pm

Okey thanks. Won't have that one again... rings are up to size now...

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

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