ESE's works engine tuner

[peewee]

did you guys see this? supposedly a sucessful way to weld 7075. now where the hell do i buy the filler rods

https://www.repairerdrivennews.com/2...7075-aluminum/

[ken seeber]

How things change with time.

Central spark plugs....gone.

Tight squish....gone

[koenich]

Copy and scale the bidalot 50 cc exh. tunnel
Later 193 deg exh.duration ( Green on the dyno grafiek )

the Bidalot does a lot of things right...great cylinder out of the box.

[dutchpower]

Got that cil.from 19 hp to 22.7 hp changing exh.tunnel and new pipe

[Flettner]

How things change with time.

Central spark plugs....gone.

Tight squish....gone

Ok, there is a bit missing.

[tdc211]

i figured results be different with a stock cylinder.
19 to 22.7 ? i thought you started at 23.3 or something.

[koenich]

he's likely talking about the Bidalot 50cc cylinder (at least that one has ~19 HP stock).

[dutchpower]

tdc211 ( Got that cil.from 19 hp to 22.7 hp changing exh.tunnel and new pipe )


Last post is from Bidalot 50cc cil.

[WilDun]

Ok, there is a bit missing.

Yes Ken, some info missing!

[tdc211]

tdc211 ( Got that cil.from 19 hp to 22.7 hp changing exh.tunnel and new pipe )


Last post is from Bidalot 50cc cil.

22.7 out of a 50? At what rpm?

[koenich]

Standard (incl. their exhaust) they make ~18-19 HP peak at ~13.500 1/min.

I'll start dynoing mine on Saturday, also testing a much shorter exhaust since I think the layout must have massive reserves reg power if it makes 19 HP at such "low" revs.

[dutchpower]

Kreidler Rotary

[tdc211]

Kreidler Rotary

i see, that is some power

[F5 Dave]

And some revs. Sheesh, I spent so much time with clearly a false rev ceiling based on RG50 in the 90s much past 12,000 killing cranks. I thought 13-14 was getting up there.

[koenich]

The modern cranks will last 40-50h on a 50cc with roughly 18 HP with overrev up to 14.000 1/min under racing condition...

We won that race with a 20h old crank 😁 https://youtu.be/KR-R6G76_i4

@dutchpower: care to share the changes in detail (exhaust channel and exhaust measurements)?