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Flow increase on 202 head
https://www.ausmini.com/forums/viewtopic.php?f=5&t=97671
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Author:  70K1100 [ Mon Aug 20, 2018 10:46 pm ]
Post subject:  Flow increase on 202 head

I've partially striped my 1100 for my mini and found that the head has had a little bit of work done to it. Does anyone know if grinding down the peaks between the valves will increase the flow of the head in any significant way? I've measured the valves and they are still standard size for a 202 head.

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Author:  Scoop [ Tue Aug 21, 2018 7:41 am ]
Post subject:  Re: Flow increase on 202 head

It would de-shroud the valve a little. I suggest having a read through GR's small bore articles on his website. They will help your understanding.

Author:  hpal [ Tue Aug 21, 2018 7:57 am ]
Post subject:  Re: Flow increase on 202 head

Here’s what I did with mine, no tested yet but looks like it’ll be nice.

Author:  simon k [ Tue Aug 21, 2018 12:54 pm ]
Post subject:  Re: Flow increase on 202 head

hpal wrote:
Here’s what I did with mine, no tested yet but looks like it’ll be nice.


you can go a *lot* further than that - you should read GR's article too

Author:  fffffred [ Mon Dec 24, 2018 4:58 pm ]
Post subject:  Re: Flow increase on 202 head

Was just watching this last night...

viewtopic.php?f=5&t=97974

Also, is this the GR article???

http://russellengineering.com.au/perfor ... der-heads/
http://russellengineering.com.au/projec ... -bore-pt2/

Author:  850man [ Mon Dec 24, 2018 8:26 pm ]
Post subject:  Re: Flow increase on 202 head

Read David Vizards books. They are full of accurate, useful and reliable information on everything you need to know about cylinder head modification.

Author:  Ian_B [ Tue Dec 25, 2018 7:06 pm ]
Post subject:  Re: Flow increase on 202 head

Books are good

Author:  gtogreen1969 [ Tue Dec 25, 2018 7:30 pm ]
Post subject:  Re: Flow increase on 202 head

Can't go past GR. Best mini engine builder.

Author:  peterb [ Wed Dec 26, 2018 8:02 am ]
Post subject:  Re: Flow increase on 202 head

Ian_B wrote:
Books are good


what's a book? :wink:

Author:  9YaTaH [ Wed Dec 26, 2018 9:24 am ]
Post subject:  Re: Flow increase on 202 head

I grew up reading and learning from books...great for getting your posture right when placed on your head whilst strutting about...or for holding doors open...etc etc

I read in one, that when remodelling combustion chambers by removing metal, that you are lowering the compression ratio so you need to skim head or block or use different pistons to compensate (or, after measuring and calculating your new CR, to just live with it! :shock: )

Author:  Ian_B [ Wed Dec 26, 2018 5:53 pm ]
Post subject:  Re: Flow increase on 202 head

When I learnt music (drumming) I was taught to read . Its not needed to play but it is essential to pass things on and learn .The credibility of the book writers is unquestioned when they hide nothing.

Author:  Goldbrocade_62 [ Wed Dec 26, 2018 5:57 pm ]
Post subject:  Re: Flow increase on 202 head

Ian_B wrote:
When I learnt music (drumming) I was taught to read . Its not needed to play but it is essential to pass things on and learn .The credibility of the book writers is unquestioned when they hide nothing.

The yellow bible says it all

Author:  Fallingbrick [ Mon Dec 31, 2018 5:02 pm ]
Post subject:  Re: Flow increase on 202 head

850man wrote:
Read David Vizards books. They are full of accurate, useful and reliable information on everything you need to know about cylinder head modification.

What he said :roll:

Author:  Ian_B [ Mon Dec 31, 2018 5:52 pm ]
Post subject:  Re: Flow increase on 202 head

Cam pro plus measures cams where you dont know what you got Every cam I got from Watson Jones Waggot came with a card .You knew tappet clearances timing The lot.Measurements of a modern grind ive seen was not modern at all.

Author:  Ian_B [ Tue Jan 01, 2019 7:19 pm ]
Post subject:  Re: Flow increase on 202 head

If you dont want to have a go on your own ala Vizard take it to GR

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