different head?

mr_bungholeo · Post by **mr_bungholeo** » Fri May 30, 2008 5:18 pm

just put reddevil's top end together and the head that was on his bike was modded???
anybody know why..or has it just been welded up cos of a blow up and not machined back properly???
marks head...with no lip to the squish band....

the head i put on for him...standard has a lip onto the squish band????

anybody???
hight from gasket face to plug hole seems the same...???

rgvsean · Post by **rgvsean** » Fri May 30, 2008 5:23 pm

Is that conical from the edge all the way in? No squish? Oh dear.

On this subject all you KR boys looking at those cad drawing of posh heads etc. Is it not possible to machine out the head and have inserts made?

What squish does a stock KR run? The RGV stock is very very loose so gains are easy.

mr_bungholeo · Post by **mr_bungholeo** » Fri May 30, 2008 5:28 pm

yup straight from the gasket face in.
you can see it at the top as i tried to lap the head...it hit the squish band with a tru-flat block....
squish on a kr1 is so bad you could run without a head gasket...

rgvsean · Post by **rgvsean** » Fri May 30, 2008 5:54 pm

I suppose you could weld but on a dual head there is a risk of warping maybe?

Maybe someone here can try something like these RGV ones?

http://www.vinceracing.tk/

Vince is on our forum so maybe he'd be able just just use the same inserts? Half the work already done?

I'll ask him if you like? That way you can have any volume or squish you like - avgas/unleaded etc.

EDIT: Just noticed they are individual.

mr_bungholeo · Post by **mr_bungholeo** » Fri May 30, 2008 6:04 pm

i think mj was trying inserts,not seen him on for a while....
hope he reads this...

mgtkr1 · Post by **mgtkr1** » Fri May 30, 2008 6:51 pm

std squish is quite big, way too big to get real benefit from serious tuning without further work imo. i think flowing, transfers entrys,cases,ex port and having the head worked is a good way of gaining something for quite a little if your handy with an engine and know a machinist. my squish is about 0.7-0.8 and can still be lower if the right fuel is used and service intervals are brought down. i dont know what to make of that head bung? cant see a great deal but it definitly has been altered for some reason? mj may know something? he's the head design expert!!

the-elf · Post by **the-elf** » Fri May 30, 2008 6:57 pm

It looks like it has been machined down to increase compression but they forgot to machine the squish band back on.

As standard the squish band is so wide you can get a bus though there. Engine will benifit a lot by machining down the head gasket face and remachining the squish to get the correct valve and compression.

vince67 · Post by **vince67** » Fri May 30, 2008 9:33 pm

Hi Gentlemen

Sean just sent me a link on your subject; you can see below a simplified drawing of my blank inserts; check the main dimensions on your KR1 head to verify if it's possible to machine inserts recess:

regards
Vince