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May 18th, 2010, 02:32 AM   #41
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Re: Billet cylinder head

Dr C if you send it over to me I will polish all the cutter marks out,
might take some time though!

Taffy the two ports will clear the down tube, but what about the
inlet?

Cheers spanner
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May 18th, 2010, 03:21 AM   #42
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Re: Billet cylinder head

I got you guys talking now, didn't I?
One thing that has become more obvious to me during the latest process is that commenting existing solutions/designs is far more easy than trying to figure the whole thing it out from scratch.

First of all: I am stunned by the quality of the preparations of the simultaneous 5-axis control program and machining of Mossbergs Mekaniska!

@Bushie:
I do not know the volume of the combustion chamber in the head. It requires manual grinding to be completed and measured. I put the valves 2-3mm up in the head, not to make the combustion chamber too flat, because that will kill the swirl at TDC. Other than that, I would probably be able to produce synthetic diamonds if not increasing the volume.
As for the cooling passages, I have not experienced any misfit with my cases.

@Popup:
There is one theory saying that you will get a better use of the exhaust pulses, if they are kept as one big pulse and not divided into separate pipes. Maybe large cylinders give away pulses that are strong enough, even if being split into separate pipe, whereas the 450īs might not. I have no experience of my own supporting this theory. Instead I kept the OEM position, to make it possible to fit any after market exhaust system straight on.

@Taffy:
Thanks for the cheering! I believe pistons grew once people understood how to design to obtain a good combustion with large diameter pistons. That made it possible fx Ducati 1198 to go to 106mm and reduce stroke but still get the required cylinder volume. I also believe that in order to get a good midrange (4-7k), with only one cylinder you will need some "leverage" to the crank. I think that with 2 cylinders or more, you can keep a fair midrange (and acceleration) with smaller stroke, because the cylinders will cooperate. As for the 450īs, revving is more interesting which requires a smaller stroke not to get obscene piston velocities. But that's only my humble unscientific ideas. I think my new design will work pretty well up to 105mm. Above that you will need even larger valves and lift and ports and-and-and...

To whom it might concern:
If critizing others work gets you off, then fire away! I will not deny you that pleasure!
If you think you are being constructive, you might have opened the hatch 2 months ago!

Now, this is still just a shiny piece of aluminum. There are more work to do before we know what laptimes it can make possible.
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May 18th, 2010, 04:11 AM   #43
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Re: Billet cylinder head

Sorry Dr C I think you my have misunderstood my attempt at humour
was in no way meant as criticism.
Love your work!

Cheers spanner
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May 18th, 2010, 04:43 AM   #44
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Re: Billet cylinder head

Originally Posted by spanner
Sorry Dr C I think you my have misunderstood my attempt at humour
was in no way meant as criticism.
Love your work!

Cheers spanner
Absolutely no offence taken, Spanner! Not by you or anyone else! Honestly!
It just strikes me how much more easy it is to have an opinion once there is a reference established. Forming your own idea/opinion out of "nothing" is much more complicated. It least it works that way for me.

I get it now, Spanner!
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May 18th, 2010, 01:28 PM   #45
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Re: Billet cylinder head

This thread is a true inspiration...... I'm glad some people are still thinking and not just following. Some of you guys really ROCK (specially DR C.... sir!) awsome.
I take it usable power is the aim not just maximum dyno figures (judging success by lap times).
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May 19th, 2010, 06:13 AM   #46
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Re: Billet cylinder head

very nice pics in your galery dr_c
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May 19th, 2010, 11:58 AM   #47
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Re: Billet cylinder head

Dead set Dr_C, that is pure moto-porn
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May 19th, 2010, 03:20 PM   #48
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Re: Billet cylinder head

Just beautiful!

Congratulations
Steve
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May 19th, 2010, 03:57 PM   #49
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Re: Billet cylinder head

Nice Head, I like that
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May 19th, 2010, 09:22 PM   #50
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Re: Billet cylinder head

Yo DR_C bro..... I've been wondering why a 250 chassis and not a 125 (looks like a bit of space left over in 250) then I thinks maybe something to do with rear wheel/tyre size. Could be tricky trying to lay down all that torque through a bicycle sized tyre of a 125? Or maybe you are more comfortable on a more substantial frame (I prefer the feel of bigger bikes to little ones, little ones seem flimsey).
You have obviously put a lot of thought into this project so Im thinking it wasn't because thats what you had kicking around in the back shed.
I am not in any way critisizing you (your work is brilliant from my point of view) its just that somebody once told me physics sez the smallest lightest bike (all things being equal) should have the highest apex speed (although I used to make a point of passing him around corners on my bigger bike).
By the way... whats the top speed of your machine? Must be one of the fastest singles around? Purely a guees from me 230km/h+
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