HAS ANYONE TRIED ,REPLACING A PISTON/CYL FROM A 40 FINNED CASE MCCOY TO A  RED HEAD   ENGIEN ANY PROFORMANCE CHANGE ,PORTING CHANGE? RUN CHARISTCIS IE 2/4BRAKE ECT?

HI Ron,

The Testor's Series 21 40 sleeve doesn't fit into the RH 40 case with out machine work.  I tried.   John Wright has done it and it will run great if you can do the machining work.

The 29, however, will interchange with no problem.  I use one on a Super Clown in OTS.  It actually runs better!  Out standing engine with an outstanding 4-2 break and a touch more power..  I used the "black" head reapinted red.

Haven't tried a .19 or .35, yet.

The Series 21 is a Dykes ring engine, is it not?  Maybe not the ideal replacement for the (lapped) Redhead 40.


Steve

Hi Steve,
Actually if you machine the case and put in the Series 21 Dykes ringed cylinder and piston, it works as good or better than the original!  John Wright does this to his sometimes.
The 29 in my Super Clown is a "mutant" Red Head.  Does a 4-2 better than ANY of the stock ones I've had and is a drop in replacement.

Louis ,
The 35 is a drop in ,Back in the day ,we had several set up to run slow Rat.
They were sleepers ,really cranked well, good HP and speed up until the cranks broke.
This was right before we developed the reworked OS 40 for use as a slow Rat motor.
Busby

Why would it need to be the lightning bolt model?

Hi Louis,
With the piston/cyl. swap, a good condition chrome case will probably be just fine.  The issues with McCoys always seemed to be the piston materials and fit. 
It's a shame that the 40 isn't a drop in swap!  They are my favorite (along with the Veco 35) for "Classic" stunt engines.  More power than the Fox 35, but as easy to 4-2.  They just have their own "sound". 

Yes, that is true; however, those Lightning Bolts look so cool.

LBs win the "coolness factor" hands down!