HectikMind7

So I'm kinda stuck on what engine to get for a truck I'm building. Axial .28RR-2 or Axial .32RR-1. Both big block, but the .28 has a 39,000 rmp max and the .32 has a 37,500 rpm max. You would think bigger means more power but I kinda thinking that might not be the case here. I'm kinda new to the nitro world and any help would be much appreciated.

tacoracer

iTrader: (1)

Bigger does mean more power, to an extent. And there are soooo many factors that determine what the power output will be on a certain motor. Something like which engine has a higher RPM isn't going to really determine which engine is more powerful.

trxnut454

There are .28 engines that will smoke .32 and .36 size engines so I totally agree with taco.

I wouldn't consider an Axial engine anyway, they suck.

HectikMind7

But if you had to pick one?

trxnut454

If I had to pick one? I'd keep my money.

Herrsavage

LRP 30.

Actually, LRP 28 Spec 3 or it's rebadged twin, a Losi 454. More RPM's than the 30, and more than enough torque anyway.

Never believe manufacturer performance figures.

wolf16731

iTrader: (9)

Funny, my Axial 28 1S will keep up with just about any other monster in the area in my Savage. They are good budget mills.

trxnut454

Not saying they aren't fast, just don't like them.

Cummins Driver

iTrader: (19)

My axial .28 Spec 1s has been great. Plenty of power for a monster truck. If im heavy on the throttle it likes to keep the nose of my savage pointed skyward I have about 10 gallons on it now and its still runs like it did when it was new. I havent even had to replace a one way bearing. The only things i have done were seal the backplate/carb and fix the pull start a couple times.

If I were to choose, i think id try the .32. Extra displacement almost always means extra torque, which is what is nice in an MT. However, the 28 has been great for me, so take your pick.

Kylar

iTrader: (187)

Gotta love the "it sucks" with zero information to back it up besides "i dont like them"....


I had the .32rr in a Associated Monster GT. Its a great engine for the price, tons of speed and torque. Kinda wish i never sold that truck, it was very reliable once tuned, always started within a pull or two.

Either would be a good choice, or also i've heard good things about the lrp 454, no personal experience though.

Herrsavage

I also had an Axial 28 Spec 1S - a llloooonnnngggg time ago(bought it from slapmafro ha ha...) It was actually a very good engine in my Savage XSS(the truck was another story..) Very torquey, and user-friendly. Over the years though LOTS of people have complained about quality with bearings, o-rings in the carbs, etc.. Anyway, I later got a 28RR for my Muggy, and it was never that great(ran much better in the 3-speed Savage..) I then put in an LRP Spec 3 with JP-2 in the Muggy, and WHAM!!! THAT was a great combo.. One of the funnest nitro combos I've run..

The LRP has the torque of the other 28's or even bigger engines - in any case more than enough for a standard-size Savage or MGT.. Where the LRP/Losi 454 shine is in top-end though - IMO.. (with an OS A5 in particular..)

Several years ago btw there were some X-dyno tests done on the Axial and LRP. The Axial - with turbo head - did about 1.45ish or so, and the LRP pullstart version 1.81. Just for reference..(not saying dynoes are even that reliable either.. Just saying..)


The Losi silver-head 427 is also a fantastic budget basher engine.. I even have raced buggy and truggy with it.. Except maybe hill-climbing and mangling drivetrains, a silver Mach will out-do any Axial IMO. I'm not talking trash btw - just saying.. The Mach is a screamer - as well as cheap and reliable.. The perfect bashing budget engine in almost every class in 1/8 - buggy, truggy, MT, SC, GT, etc...

bellr77

I got an Axial .28 biggest problem is I cant keep a pull start in the damn thing. To much compression. Way harder to pull over then any of the other .28 engines I have owned.