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Yes sir. Same weight, same strengh, just a different design adapted to my tooling/cnc.

It's not my parts, but i saw it in another forum and liked the idea. Yes, those oval holes are for threading in the gear. Plus i will do 3 more holes in the ring gear (to put pins) to fix everything when it will be setted.

Like this one. Plus i'll pre drill 3 holes on the gears to be able to put pins and block everything.

Did some changes on the rockers.

I will do slothed (oblong) holes in the cam for fine tuning.

Did the pistons today. I changed the ring groove to 1mm( 0.039") instead of 0.0325" because i already had the 1mm grooving tool, so i adjusted the pattern. I will make the ring 0.008" thicker.

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Did the rocker brackets today. It take exactly 4:00 min to do one, about 1.5 hours of programation.

Yes, i usually do a couples of "prototypes" before the final ones ;-) I did the liners on the 1250ctx. So i did the outside diameters in lathe mode, and i did the bore with a Udrill and the finishing with a boring bar. I left some little material for manual honing with cross pattern.

No problem, it made me double check everything ;-) When i did the cylinder, i checked the lenght after the third one and i got 1.417", so i did all the remaining one at 1.417 ;-)

Did those parts today Everything went good. Still not sure why the carbs is offset center tho. I tought that it was about "centering" the carbs vs the 2 longer intakes tubes, but if that was the goal, it can be better than that.

Hi guys. It's my first built. I'm mostly doing it by the plan, but i adapted some parts to my machining capacity. Im using a DMG DMU50 (5 axis mill), DMG 1250CTX (mill/turn) and a 4 axis wire EDM and a 3d printer ( mockup purpose) Here are the parts i made so far:

I just did it "by hand" and i still get the same results.

I dont want to hijack this thread, i will make a new one about CR.

My model should be accurate and you're 100% sure of your calculation. I will setup a couples of drawing to show my dimentions in case of an error on my part. I actually hope that i made the 1.925 vs 1.86 error!! We are doomed!! ;-) Worst case is i will add shims if my CR is too high. I can...

Please guys, post your compressed (cv) volume, the uncompressed volume (uv) and the squish you got from your calculation. With lips at 0.150'' : uv: 0.765ci cv: 0.09ci Squish: CR: 765/0.09= 8.5 I didnt calculate the volumes, i asked the cad prog what was those volumes at tdc and btc directly...

I checked your file and i saw that you have a squish of 0.080"??? That's a very big squish. I would guess about 0.040'' as a good starting point

Not sure anymore. My cad prog already add vc+ vb when the piston is at BDC. I will simply check squish to see if im good. I dont have my 3d model at home. it would be nice if someone who have already built the engine would give us some info.

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I will check your excell sheet tomorrow. My model is acurate and it doenst make mistakes calculating the volumes. There is something wrong. I will double check everything tomorrow.