Victoria! Zeke's CB175 Build

My old man taught me to level the head, then put a sheet of clear plexi with a tapered hole over the head. Use vaseline to seal the plexi to the head. Then fill the burette with dyed water and siphon water from the burette through the tapered hole into the head. When the heads full, you get the reading off the burette.
 
yes that gets you the chamber volume but you must do it with the pisstion at tdc as well to get actual trappd voloom
thru the sparkplug hoe
 
xb33bsa said:
you need to getcaha a graduatedatated burette
the procedure is common knowledge old as the hills
nothing wrong with doing the math on an estimate of the dome volume then bla bla bla but you cannot fool and actual fisical measurement with fluid and accurate method
trust but verify measure twice
Click to expand...
just for you bud
We greased it up like a pink pig at hootenanny. Laid the engine on one side, leveled, filled to the second thread (no cheating) used a graduated cylinder so we did have a smidgen of water left in the graduated cylinder ...compression ratio
For the 160 total combustion chamber volume is just under 10cc and our compression ratio is 11.38-1 with a. 038" squish.
For the 200 head the total combustion chamber volume is just under 13cc total and a compression ratio of 9.12-1.


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deviant said:
My old man taught me to level the head, then put a sheet of clear plexi with a tapered hole over the head. Use vaseline to seal the plexi to the head. Then fill the burette with dyed water and siphon water from the burette through the tapered hole into the head. When the heads full, you get the reading off the burette.
Click to expand...
thanks deviant that is the way we have done it up until now.


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xb33bsa said:
awesome
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We have y'all to thank for helping us get here but we have a long way to go. Really excited about the 160 head for only a Teazer would come up with a solution like that and challenge us to take it on.


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Texasstar said:
just for you bud
We greased it up like a pink pig at hootenanny. Laid the engine on one side, leveled, filled to the second thread (no cheating) used a graduated cylinder so we did have a smidgen of water left in the graduated cylinder ...compression ratio
For the 160 total combustion chamber volume is just under 10cc and our compression ratio is 11.38-1 with a. 038" squish.
For the 200 head the total combustion chamber volume is just under 13cc total and a compression ratio of 9.12-1.


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Click to expand...

So now (you've got the exact numbers) what?
 
simo said:
So now (you've got the exact numbers) what?
Click to expand...
i would say our margin of error is + or minus a .005 of a cc :) it is not our final compression ratio but close. I still need to borrow a bowling ball so we can lap a slight squish angle and just barely chamfer the sharp edge of the combustion chamber on both heads. But now we are closing in on where we want to be. We still have a final decking to do on the 175 head that is gonna be here with the ball bearing conversion. Mike is also sending us mag plate seal housing and seal.

Picked up some spacers so we can leave the cover off to degree the cams. Need to make a piston stop and we will be ready. Zach from R/D has his spring kit and the lash caps in the mail. Just a plug for Zach Jones of R/D valve springs. He is a GREAT guy and will do whatever to help. His springs have .62 coil bind where as our crf150 springs have a .83 coil bind. We are gonna use his springs in the 175 and 200 heads because of the guides and we are going to use the crf150 springs in the 160 head because they fit over the guide and the guides don't have the shoulder like the 175 and 200. Also the 175 cam we are using in the 160 head has has less lift and because we turned down 175 valves to fit in that head we have less retainer to guide clearance.

Simo please make sure to remind me to drill out the oil bearing hole in the 200 head on the right side. We are using the 200 megacycle cam and head on the 175 vert.


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Some interesting twin trivia for Honda trivial pursuit. The 160 rocker arms stock were as light as what we lightened and polished for lucky. The bigger tappet bolts of the 160 are lighter than the smaller tappet bolts of the 175. Go figure.


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Texasstar said:
Some interesting twin trivia for Honda trivial pursuit. The 160 rocker arms stock were as light as what we lightened and polished for lucky. The bigger tappet bolts of the 160 are lighter than the smaller tappet bolts of the 175. Go figure.


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Click to expand...

the bigger ones must be shorter eh ?
 
Right I'm the hole in the head guy :eek: !Will the offset link sort the cam chain length ?
 
simo said:
Right I'm the hole in the head guy :eek: !Will the offset link sort the cam chain length ?
Click to expand...
with the 200 head combo we decked .120" total and with the 160 head .078" total...have to verify tonight


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i like the bowling ball method for that squish angle very slick !!
will you use some trippy colors or a black one :D :D
 
xb33bsa said:
i like the bowling ball method for that squish angle very slick !!
will you use some trippy colors or a black one :D :D
Click to expand...
that is a KOP custom fab method


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xb33bsa said:
i like the bowling ball method for that squish angle very slick !!
will you use some trippy colors or a black one :D :D
Click to expand...
i think we need the biggest ball we can find for a lower squish angle


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Sonreir said:
NGK R2525-9
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Matt what do you think? Will the shrouding help with removing heat from the combustion chamber. The length is misleading it is 22mm to the tip. Why do you like the platinum over the iridium http://www.google.com/patents/US20140009058

Denso IXG24 IXG27 22mm better heat dissipation?


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Plug aren't there to remove heat from the chamber. You've got an aluminum head and plugs are steel. They will almost always be hotter than the rest of the chamber (except maybe the valves).

I like the NGKs because the side electrode doesn't protrude as much.

As far as platinum vs iridium, the main difference is that the iridium lasts longer. Similar performance.

If you can find a set with multiple side electrodes, go with that, though.
 
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