The new ceramic coated cylinder's

Did the transfer roof angle and raised them 3mm today,polished the piston top and started fitting the bushing's I use as spacer's to keep the small end bearing centered.balanced and trued a zae50 38mm stroke crank to be used with the low pinned piston,still have to deck the cylinder just over a mm and a half and do the flanges but I got the exhaust port window opened to 23mm equivalent dia and looking good just have to cut the peak's above bridge and the intake surprisingly didn't really need much and will have 127 degrees of duration with this setup,the cross section of the transfers are a bit shy of what I'd like to see but I really can't raise them any more than I have and the blowdown duration is low but I'm hoping this will aid in scavenging would be great for a reed setup but I run p/p so just going to try it and see!
IMG_0049.JPG
IMG_0070.JPG
IMG_0068.JPG
IMG_0071.JPG
 
These are the bushing's I'm using to space the small end bearing,next time I order some I'm going to get larger dia just as a further rod walk stop. But these will work for now keeping the bearing centered,they still need to be thinned out down to just under 1.5mm because the shoulders in this piston are 18mm apart so just under 3mm total of spacer's and a 10x14x15 bearing is my 18mm perfect!
IMG_0072.JPG
 
These are the bushing's I'm using to space the small end bearing,next time I order some I'm going to get larger dia just as a further rod walk stop. But these will work for now keeping the bearing centered,they still need to be thinned out down to just under 1.5mm because the shoulders in this piston are 18mm apart so just under 3mm total of spacer's and a 10x14x15 bearing is my 18mm perfect!View attachment 97366
Cant wait to see how this performs once you get it all together. Awesome work brother
 
Well I'm finally back at it, it's been awhile had alot going on the only thing that stayed constant is the riding, my 15 year old engine is still running pretty strong but can't wait to try this new ceramic cylinder setup and I'm changing up a few things again.
Going with a 40mm stroke crank from the gt5b engines that came out it will be balanced and trued and give 72.3 cc's, also going with the upgraded ignition parts from the same gt5b engines.
I want to have this done soon as I have put it off long enough LOL.
 
Did up a couple 40mm stroke cranks, it's funny the factory is making the flywheels thinner reducing mass robing us of power there and increasing the case volume lowering the ccr, these are barely 15mm thick where the older were 17-18mm and the original's 19mm thick yeilding a ccr of 1.12 it wasn't very good and then even worse now!
Balanced to 46% bf and trued up to near perfection, this will be used in this ceramic coated jug build above and should sing smoothly!



IMG_0646[1].JPG
 
Finally got a chance to work on this some more and man alot of work was required!
So with now using the 40mm stroke crank and this 48mm bores new piston the jug requires a spacer made to get the crown down to the deck height.
i ended up cutting out the bridge as I just didn't like it, and found there is not as much meat in these newer castings, I needed a cross section of 30mm to get the correct window area to macth up to my setup and this left the walls really thin, where on the older jugs this was easily doable.
Anyway here are some pics of the progress thus far!
 

Attachments

  • IMG_0879.jpg
    IMG_0879.jpg
    103.9 KB · Views: 39
  • IMG_0884.jpg
    IMG_0884.jpg
    129.8 KB · Views: 40
  • IMG_0869.jpg
    IMG_0869.jpg
    164.2 KB · Views: 38
  • IMG_0871.JPG
    IMG_0871.JPG
    156.3 KB · Views: 45
Back
Top