4-Stroke Engine Queries
 

Hi.

I am new to this site, so if what I am about to ask is obvious, please excuse me :)

I went to osengines.com and noticed that they have a 4-stroke engine for touring cars. Does this engine still "spit" oil from the muffler like normal 2-strokes do? Are normal 2-strokes supposed to do that anyway, or is it bad tuning?

Is there a website I can go to to find a sound clip to hear what a 4-stroke engine (similar to the one I am talking about) sounds like.

What are the benefits of 4-stroke engines?

Thanks in advance.

SpeedOfSound

RE: 4-Stroke Engine Queries
 

First of all, wlecome:D
now, the 4 stroke will still smoke, since it does get its lubrication from the fuel, but if your 2 stroke spits fuel, you need to lean out your fuel mixture. but this doesn't mean there's anything wrong with the engine. As far as the sound clip, i have no idea.

the benefits are more low-end torque and better fuel efficiency.
Hope I answered your questions.

RE: 4-Stroke Engine Queries
 

Thanks ThunderbirdJunkie :>

Do you use a 4-stroke engine yourself?

RE: 4-Stroke Engine Queries
 

The four strokes are not very popular in the cars in the USA. They still spit some oil even when tuned correctly.

Enjoy,

Jim

RE: 4-Stroke Engine Queries
 

The OS 4C engine for cars looks good only, especially the latest one that lies on its side, I believe that some guy in the US fabricated parts for the Tamiya Ferrarri and used that OS engine. That is all its good for ... looks kewl and sounds great.

I find that my 2C engine and my 4C engines spit as much oil ... planes are always messy. For me the 4C engines are great for some scale planes ... like my little WACO 60 ... love the way it putters about. If you are into fast and furious flying you would be better off with 2C engines as you want RPMs in the 12K and 13K region. 4C engines are very popular now and its like almost everyone is really into them over the last 2 years. I find that 2C engines are easier to start off with and 4C are brilliant but you need just a little bit more patience in loving them, once you treat them well ... they are lovely. I got a 2 year old Saito 72 that still runs very fine ... max RPM is still about 10,200 RPM.

RE: 4-Stroke Engine Queries
 

We just recently got the OS .26FS-C back in the states.
mine is on order:D

RE: 4-Stroke Engine Queries
 

How about a VIDEO of a TWIN engined, four stroke powered aircraft???

Dear SpeedofSound:

The PIPE Here...and here at RCU, I found a VIDEO of a TWIN Saito FA-72 (12 cm3 displacement on each one) four stroke powered "3-D" style RC aircraft in there...

it's at http://tufflight.com/double_d.wmv ....a thank you for THAT nice video goes to "Ultimate99", who originally posted it here at RCU, at http://www.rcuniverse.com/forum/m_25...tm.htm#2537059 .

Even though it IS a PAIR of Saito FA-72 12 cm3 engines on that one, it WILL give you a good idea of WHAT a four stroke model engine sounds like...and ALL I fly with are four stroke engines !!!

Hope you can see that video all right...

Yours Sincerely,

The PIPE! ;)

RE: 4-Stroke Engine Queries
 

Thanks for the clip The Pipe :> That plane sounded great!

I definitely want to buy a 4-stroke engine, if for nothing else, then just for a change.

What are you going to mount your OS .26FS-C into, ThunderbirdJunkie?

RE: 4-Stroke Engine Queries
 

My experience with OS engines is that they spit oil much less than other engines, both their 2-stroke and 4-stroke. OS 160 FX owners can attest to that.

4-strokes spit oil not only out of exhaust, but also through the breather nipple. Some new OS 4-stroke Surpass 2's have a line connecting the breather nipple to the intake manifold, so eliminating the oil that would have gotten out from the breather nipple.

Also, the type of fuel you use will make a difference in how much fuel getting spit out. Fuel with all-synthetic lubricant is less messy than those that contain castor. So for example, Wildcat Helimax w/ 16% all-synthetic lubricant would be less messy than Sig Championship w/ 10% castor + 10% synthetic. These are airplane fuels. Make sure you use the fuels that the OS car engine manual recommends.

RE: 4-Stroke Engine Queries
 

I honestly have no idea, I haven't decided yet.
probably an RS4-3 or an Ofna CD3 or LD3, or an RS4 MT.

RE: 4-Stroke Engine Queries
 

Sean, that raises an interesting question, I run Fox 5% nitro/20% either all castor or 50/50 castor/syn blend, if the 1.60 spits less oil, where does it go? My theory is that certain mufflers, Bissons for example, do a better job of blowing the oil away from the plane because of the crimped outlets which would accelerate the exhaust gasses. I dunno, but it's a thought.

RE: 4-Stroke Engine Queries
 

I think your muffler theory may well be correct. After all the oil has to be going some where.

While I certainly don't own enough 4-stroke engines to draw any sweeping conclusions, from running Saito, OS, and Magnum 4-strokes on the bench where the oil is more or less trapped after leaving the engine I can't tell any difference in the amount of oil "spit".

jess