im kinda thinking about the speed lol

Who doesn't think about speeds?

well idk if its worth it ya know...

Sweet engine. Holy hell expensive.

*James raises hand*

I think about how many Speeds I am gona put laps down every weekend :spidey:

Nobody in AZ runs speeds. For some reason they just dont last very long here. Maybe its the high heat factor or lack of humidity, IDK but there are no speeds at any of our tracks, or really any OS at all. Its Nova, RB, Alpha and Werks with a few Orions and Maifield's Reedy..Wait my bad..there are a few Ninjas so thats OS

OS engines don't last long here in Colorado either. I think a lot of it is the 6,500 foot elevation we race at here. At that elevation you loose about 20% of your overall power on one of these engines. Now with that lack of oxygen your running your needles pretty lean to get the power your looking for. Now factor in the way weather can make HUGE changes in a matter of 5 minutes here and it's very easy to go from an ideal tune to a lean tune. It's pretty obvious just looking at an OS sleeve that they do not use the amount of chrome on the sleeve that Italian mills do. To me this is the reason why an OS mill can't handle a lean run and will loose all compression the first time it happens.

Tough crowd. I don't get that many gallons out of my p/s either, but when i mention that people start calling me a fibber. But my speed does haul ass.

Another reason for v-spec-xzb 21 engines wearing sooner than others is the fact they use only three ports with lots of timing,making the ports very large.The tranfers being on the thrust sides of the cylinder take away support for the piston.When they run short of lube the piston tips into port accelerating wear.Snowmobiles and motorcycles ran into this in the 70's and 80's.They cured this problem by using bridged ports.I think the Ninja is a superior O.S. based engine being a 5 port,realy the tranfers are xzb just bridged.So any make engine using multiple ports would last longer,unless it was a three port with little timming making the port smaller.

I would never try to argue with anyone on the performance, they do run great!! I myself will never buy one because the year I started racing was when the VSPEC first came out and the number of broken con-rods I saw that first season was UNREAL. I know the newer OS engines no longer have this issue of eating conrods, but first impressions seem to stick with me. Plus $500 for an engine that isn't going to do anything to my lap times makes little sense when the engines I have perform just as well in racing conditions.

OS makes some great engines. I was not trying to imply otherwise. It seems that they are like the Dallas Cowboys of the RC engine world. Everyone either loves them or hates them. 50% of the guys say they last 2 gallons and the other 50% say they get 8-12 gallons. I am sure the truth is right there in the middle somewhere. I have seen people with V specs get 10+ gallons and also 3 gallons and shot, so I wouldn't know what to think anymore. My best guess would be that the people who are really good tuners and know proper engine care get allot more fuel through their OS engines than those who are not as meticulous or experienced.

I just got the memo and I'm sorry to say that the powers that be have added you to the speed hater list. Sorry I was elected to to distribute the info. You are ok in my book :D

The only thing I hate are the NY Yankees!

Chris,

the reasson the OS engines might loose compression faster is beacause they have a slightly softer piston material. If the chrome plating is 0.05mm or 0.07mm is if no impotance on how long the p/s will last. It is all in the psiton.

I have messured 10 OS piston and sleevs and tested with a lot of used pistons in new and used sleeves. From a psiton that is new in a sleeve, to the messurment that is all worn out, it was less than 0.0015mm. Splitting hairs is like steel beams when you mesure theese engines :-)