zen 4-bolt g270

[badd_maxx25]

has enyone tride this engine in a rampage

 

[Sprint 77]

Very good choice, It is better to use the clutch housing off your CY engine or you will have to drill two more holes in frame.


Very reliable engine and they usually come with 813 carb so start procedure change a little that carb has a accelerator pupm and no choke.

 

[RcLovin]

I have the same engine to


Ive had the engine for 4 tanks would be more but, I railed a tree and waiting for new upper arm. That engine performs pretty decently the last post said the carb has a accelerator pump should I drive it differently then other engines.

 

[timsted]

i have an ONB raceport g270 in my tt, it's plenty for the track, and for the most part stays ahead of yolonda's 27.2

 

[yolonda21]

Blah blah blah........

 

[badd_maxx25]

does enyone have eny dyno numbers of the engine with a sprint modded dominater pipe. i would like to know how it compares to my cy 27

 

[Sprint 77]

Dyno is bull < what type of track or area you have to run, What gear you going to run, That is the questions you ask when choosing a pipe and engine combo.


Most cars never see the full out rpm very long that a dyno does. You are usually on and off the throttle.

 

[badd_maxx25]

im going to run in long strait aways, and a short corse track, 29-31 gears

 

[Sprint 77]

You should be fine with that set up . You just may experiment with switching the 29 / 31 gears from 31 / 29 ; 29 / 31 to allow max RPM on the times you take it to the place with Long straights.


Another thing to look at is port work on that motor and exhaust port timing.


Raising the timing to about 175 - 178 degrees will increase the RPM , That has been proven out on a dyno.

 

[fastlane]

Is this motor better than the ESP race ported 28.9?

 

[Obeast44]

In response to Fastlanes question.


Performance wise, no. Longevity wise, yes.

 

[Obeast44]

I thought we were talking about a stock Zenoah 4 bolt vs an esp 29cc? Thats what my comment was referring too. I agree OBR motors are more powerful than ESP's. Gonna start building my OBR 30.5 in the next few weeks for LargescaleRCs event this coming June. That or I might try a marine 27.2, granted it wont be as powerful as the 30.5, it will be ALOT cheaper to rebuild. Cant really decide hehe

 

[fastlane]

I am talking about G270 OBR race ported lighten piston and decked cylinder. 25.4cc v/s 28.9cc race port ESP

 

[Obeast44]

obr will eat it for breakfast..

I concur fully.