Another new Go engine! This time the Massive Mods MG66

[Adrian E]

Hi folks

Thought I'd post up some pics of the new Go / Massive Mods Mg66 - it's produced by Massive Mods, who if you don't know who they are are the Australian Go distributor, as well as long standing engine modifiers   The motor is based on the Generation 6 Go .21 5 port, but modified to have 6 ports!




What you get in the box


   
   


Running in instructions, a full set of carb restrictors, spare main bearing, spare conrod (not pictured) and a head shim for 30% fuel

I'm going to be running this in tomorrow, assuming the weather is kind to use - if I get the chance I'll also be running it at the Hertfordshire SRS round on Sunday

I stripped it down for a look-see last night, since Go engines have been tweaked a fair bit since the last time they were available in the UK, to see what was different compared to the various Go's I've had before.

First thing you notice is the gold colour to the crankshaft, which on further inspection you'll also find on the carb slide and on the wrist pin.  This is a Titanium Nitride (TiN) coating, similar to what you'll find on RB WS7 and OS Speed motors, intended to prolong the life of the parts and also to reduce friction.  TiN is usually used on cutting tools to reduce wear because it's extremely hard, so it'll be interesting to see how it stands up to use over time.


   
   
   


The carb has been redesigned (again!) and has reverted to a long Low Speed Needle design, which requires a different style of tuning to most engines.  More of that later, once I've started breaking it in!

Now this engine is all about the porting - you can just about make out in the picture showing the exhaust port above how the throat of the crankcase casting has been machined to match the porting on the sleeve.

[Adrian E]

The piston and liner are seriously lightweight!


   
   


The rod is also a new design, straight from the Go factory, which features in their 'Pro' ranges of engines, including the new GX motors due in with Answer RC any day.  It is REALLY nicely finished!

The liner is just something else!  I'll let the pictures do the talking.....


   
   



   
   





I wish I had a spare 5 port liner hanging around to give you a better idea of the changes to the porting.  Nothing here is silly though, there's plenty of meat to the liner around the ports.

[Adrian E]

There's also some nice attention to detail in the crankcase, with support fillets around the liner to keep it firmly in place under load, the machining where the rod runs has also been altered to help support the rod as it rotates - unlike older Go engines the rod needs to be at the top of its travel before you can release it off the crankpin.  Gratuitous crank shot


   
   


I've stuck it all back together this evening and spent ages finding spare flywheel, clutch, bell etc etc without stripping one of my other engines - hopefully all ready to fire up once the neighbours look like they're up and ready for some nitro in the back garden :lol:




I'm starting off with an OS P4 plug and 053 pipe and will see how that goes - Go's own range of turbo plugs will be available in the UK any day now, as will the favoured pipe, the 2072.  Also recommended is the 086.  I'm sure a JP-4/2062 will also work well - since I've got a couple I'll probably try one for comparison once the engine's fully broken in.

Will post back once I've started break-in - the recommended method takes no more than 8 tanks, so this is nowhere near the mechanical pinch of earlier Go engines!

Adrian

[dibles]

How was it?? any good?!

[Adrian E]

This engine was a pre-production example - it suffered a casting failure on the piston after about a gallon 

I have another here, but haven't had the opportunity to run it in yet.