measuring head volume. added more pics... @24.5 cc now.
Turbo Mini Forums

hy. been grinding somewhat on my cilinder head. i used to measure volume of the chambers by putting a plate on it that i closed up with grease and filling the chambers with liquid trough a hole in the plate. like that i could read how many cc of water went into it.

is there a different more accrued technique that can be performed at home for this?

greets

Edited by Rammie2000 on 21st Mar, 2016.

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

Not that I'm aware of. I use that technique.

What you're already doing is fine and accurate.

Phil.

WWW.TURBO-MINI.COM

Okey chears.

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

I do it like that. Try with the head at an angle with the hole at the top. Also add a drop of washing up liquid.

I have used thinners makes it easier.

You can do it without a plate if you set the head dead level and use alcohol (spritus, vodka). Has less surface tension than water and does not form as big a bulge and you can eyeball it fine. Imho easier, less messy and more repeatable.

Water causes rust , thinner does not but unkike vodka you can't really drink it

Edited by Sir Yun on 14th Mar, 2016.

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/

why washing up liquid?

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

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

No one uses water! Use diesel.

If you're just measuring into an open, level chamber I agree that water is a daft choice. Thinners (or diesel) lie flatter in the chamber so its easier to see when you've reached the top.

But with a plate, that's irrelevant. Having tried both, I find that solvents wash away the grease sealing the plate after a few measurements and it's all just less of a mess to clean up with water.

My toughts to phill.
Tryed diesel yesterday open chambre and went well... with only one downside wich probebly had more to do with the spout then the diesel but the diesel got out the spout faster then i puched to drip it in the chambre leaving an air pocket. East solved by turning it up and puching air out but makes doubt of the accuracy ( although it came out nearly the same ( 0.5 cc difference )

The water is easy because i colour it in with ink.

Now. Did make me see a problem... when i mesured it before bringing it into the workshop to flatten it it had 21.8 cc in a standard cambre... i started working on one cambre and after i big peace that was grinded away i mesured that one... now makes 21.5 cc! So mesured an untouched chambre again. Seem that the machine chop took it of a but much because they now make 18.5 cc

Ill post a pick. Lett me know if i can go further and if posible ... what direction.

Greets

Edited by Rammie2000 on 16th Mar, 2016.

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

So far went back on the rear side of the head quit a bit but... need another 4 to 5 cc to get it under 8.5 compression ratio.

Edited by Rammie2000 on 16th Mar, 2016.

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

How much did you ask them to cut? Before you grind any more, measure the total head thickness at all 4 corners to make sure it hasn't been cut on a slant. I've had 2 different shops clamp heads down onto the valve guides, so weren't flat. It should be fairly obvious if they're paying attention, but they both just cut deep enough to hide the mistake.

Edited by PhilR on 16th Mar, 2016.

Its 69.16 mm all round so there we are good. Cant remember how much it was before. I asked the to cut minimal.

Can i go further shaping this or make it a bit deeper ( note i only have a dremmel tool and a shit load of paciance and a steady hand to make this)

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

Standard head is 2.750" tall so it's lost around 0.69mm; maybe already skimmed before you had it?

Its deffinately not ideal but IMO I think you can get to your target.

I'd say its best to do your 1st heads with a dremel, slowly. Get a set or carbide burrs if you haven't already, and leave the stones for finishing. Get the router attachment that holds it at 90 degrees and a constant depth so you can level the chamber roof safely (cut a square of perspex to rest on so it doesn't fall into the chamber). Cut down to the valve seats but I wouldn't be tempted to go deeper tbh.

Edited by PhilR on 16th Mar, 2016.

Not sure if these will help you.

Edited by slater on 16th Mar, 2016.

thnx did they work well opend up to the front?

i tought on using really crude paste on the valves and lap them in till they sinc in a bit and then deepen out the chambers to

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

Rammie, don't grind the valves. It takes forever, and after a very short time, both surfaces will become concave, which you'll have to correct (even though they'll seal).

Try to leave the 'beak' at the back if possible and take away metal from either side of the spark plug instead. You can grind the beak out if you need to, but if you try to put the spark plug closer to the centre of the new chamber then that could burn the entire mixture slightly quicker, and hopefully require less ignition advance.

Edited by PhilR on 16th Mar, 2016.

interesting. well part of the beak is gone at the top from that first one so will need to do simular to the rest. but it is stil mostly there on the bottom. can take slightly more of it away at the inlet valve so it becomes more like a beak shape there. and take the rest to the front.

thnx for the tips and advise. ill ad pics as i go with it.

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

For measuring the chambers drill two holes in the Perspex plate you're sticking to the face, one to fill through, the other should be towards the outer edge of the chamber. Now when you fill the chamber the air has the other hole to escape from allowing a consistent and accurate result. As above, water is fine when doing this method. Other liquids such as thinners will dissolve the grease holding your Perspex in place and render your results useless.
What's the current chamber size now you've modified it, as in the picture above ?
It is possible to go deeper in the chamber but you do start to lose the short side radius, not good for low lift flow.

Phil.

WWW.TURBO-MINI.COM

Also you must have the patience of a saint if you're doing all that with a Dremel !

Phil.

WWW.TURBO-MINI.COM

i use the perpex methode. the left chambre is modded as it is now. ill make it bigger to the spark plug site.

and yes when it comes to engines i have the patience of a saint on valium.

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

For the beak, I suspect you may have to carve it out to get the cc you want, so not to worry if that's the case. The last head I did, I completely cut I out.

Zoom into Turbo Phil's avatar to see where he's cut both sides of the spark plug, which helps puts the spark plug a bit closer to the centre of the fuel mixture. (also, no beak).

So this is where i am in 1 hour of grinding fun. At 23 cc now. 2 more 2 go... although. .. might be needing another cc... stupid me.



I shot out. Never had this before but having the flu and not concentrating... well no excuse. Its a dumb mistake!. Although not deep probably needs a very thin skim to get rid of that... costing me cc!

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