254/346 Hybrid Build “documentation” thread thingy… idk

[ZukiRyder440]

Alrighty here it is with the Zama copy.. It definitely woke up some and feels waaayy better that the stock 120 did.

 

[ZukiRyder440]

Little off topic but i had to get my 372 out and play a litttlle bit

 

[ZukiRyder440]

I ordered the piston, it should be here this upcoming Wednesday and ill start tearing it down for machine work/ port work.

So far its real promising. Im curious to see how it stacks up with a stock 254

 

[ZukiRyder440]

Alrighty gents… the piston should be at the house by Friday. You guys know what that means… tear down time… again.. ill post some pictures of the spacer I made for the base when I get it apart.

 

[ZukiRyder440]

Update: the piston will be here today!! Ill post pics of it when i get home. Its like an early Christmas haha

 

[ZukiRyder440]

Ooops i forgot last night heres some measurements too. I just might be able to ditch my spacer, we shall see

 

[ZukiRyder440]

Teardown has begun….. again squared

 

[ZukiRyder440]

Thickness of spacer

 

[ZukiRyder440]

Thickness of the 2 gaskets i was using.. my memory was a little foggy they are basically the same thickness

 

[ZukiRyder440]

Yeep I ended up ditching the bottom ring just
To be on the safe side.

 

[ZukiRyder440]

I matched the cases to the 346 cylinder transfers..
The pics made em look worse than they actually are. Itll get the job done though

 

[ZukiRyder440]

I replaced the started pawls, the old ones were fooookkeedddd. Luckily fhe 266/268/272 pawl are a perfect fit. Gotta love a 2 series

 

[ZukiRyder440]

The corners were rounded off on the pulley so I took a grinder and made those edges straight, came out pretty decent. Itll get a saw started I suppose

 

[ZukiRyder440]

Annmdd all back together a s ready for a test run tomorrow

 

[ZukiRyder440]

It ran.. briefly… it acted like it was sucking air. The transfer tunnels I ground on had a hairline crack and sure enough it opened up into a giant hole… so i filled it and am not in the process of spinning the flywheel on the lathe to clear the bulge.. bonehead move.

 

[ZukiRyder440]

While it was apart, I did some mild port work, I widened the ex and in and tried to fix the shape of the lowers. They were all sorts of wonky to say the least

 

[ZukiRyder440]

Top of the piston was machined down flat, it curved up to .010” towards the combustion chamber then tapered off to .0245” down at the edge of the band closest to the cylinder wall.

 

[ZukiRyder440]

Stock width on left hand side, widened on the right

 

[ZukiRyder440]

Stock ex width in the middle, widened are the out side marks of course. Did not do anything in terms of tweaking port timing/ duration. Just added more area.

 

[ZukiRyder440]

Flywheel shaved, i didnt take ofd a set amount, i just went until the rubbing marks were gone.