I have a brand new TT PRO46 which is installed sideways (90 degrees from vertical) in a Groovy 3A. I need to break-in this engine. Is it advisable to break-in the engine in this configuration or should it be broken it upright?

Rajeev,


Just break it in in a test-stand.

Your Groovy will be flying at all attitudes, but the test-stand will have it upright.

This is an ABN engine and the procedure described in [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]this RCU thread[/link] should best be followed.


This is a particularly long lasting ABN engine.

Hi!
It doesn't matter !
Just fly it...or run it in a test stand...either way doesn't matter as long as you avoid dust and grit (which is easily sucked in if you have the eairplane sitting on the ground/grass/tarmac.

Doesn't matter, Some of mine are inverted

Please be aware that running your engine with the cylinder mounted horizontally will cause the cylinder to wear egg-shaped because of the pull of gravity acting on the piston. I know this because I was told this many times by Chevy owning adults when I was just a child (my father drove a Ford V8). I was always taught adults were never wrong. ............RJ

Break in as you would normally; shouldn't be a problem - nothing to see here.

You are overdone

The egg-shaped bore are caused of side thrust since compustion pressure against piston + angle of connecting rod who make more pressure against cylinder wall there the wall are worned out.

Jens Eirik

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You forgot, "move along" <G>


Ed Cregger

If this happens, Just flip the engine onto its other side and it will even out!

G'day Mate,
You may need to adjust the angle of your muffler deflector, as the plane will get yucky oil all over it, with the cylinder on the other side of the aircraft!

Guess I have some bugs to work out on that plan eh? Think about tuning it with a smoke system

Pistons wear due to the fact that one side of the piston is the "thrust side" due to the
pressure excerted when the piston pushes the rod down on the power stroke. This wear
is diminished to nill, because the rod squirts a stream of fresh oil to the thrust side of
piston on every upstroke revolution.

This is related to full pressure lubrication systems, like in 4-cycle cars and motorcycles.

FBD.

Dave, you have to consider high compression engines, they wear the other side of the cylinder on the compression stroke.

I dont know which side was it but after only 50.000 Km s my Volkswagen Golf 1,9 Diesel engine lost compression and began oil consumption and when dissasembled the engine,all 4 cylinders have got eggshape wear on sameside of engine(my nail could get feel it easily on that side).

Turk....that is an upright mounted 4 cylinder...right ?

dup post see below martin

[quote]ORIGINAL: dieseldan

Turk the engine had a "green block" For some reason the cast iron was soft maybe not a good mix. I bought a mercedes 220D used from the dealer it was a year old and same problem They replaced the engine no charge and it this was in 1969 it ran well I finally sold in in 1982 with over 300,000 miles on it and ran another 2 years before being destroyed in a crash by the new owner.I did not make up the green block thing this is what I told by mercedes and they had a a few out there and just replaced the engines at no charge to the owner It made weekly trips to Atlanta
Ga and Orlando Fl the kid was in college up there and never had an other issue till it s demise martin

It got replaced with a nissan maxima with the L28 egine this was a diesel variant of the L 24 gas which had a hot version in the 240Z , 6 cyl in line overhead cam it was pretty quick and later dropped too bad.
seems to be a similar story with our model diesel availablity

\As far as the Little ones there was an overhead cam 4 strk glow (german) that uses a timing belt (forgot name)
but an awsome runner and also now gone priced higher than YS the local HS had one sorry I did not buy it, used but good shape maybe about a 60??

Hi Dave,yes it was an upright and lateral mounted,turbocharged preigniton chambered,Bosch mechanical injection system diesel engine,car was 1997 model.And unlike DieselDan I couldnt get anything on warranty because it was either 100.000 Km s or 1 year(which one gets early).And I was able to make only 18000 km s in one year.Then I swear never having any VW product since.The eggshape wear was not exactly on side but some cornered and all equal on 4 cylinders.

I would suggest faulty metalurgy too....it should have gone 200,000km (or more) , no problem. []

FBD.

To reduce egg-shaped cylinder will it be best to use Desaxe or longer connecting rod. Older engines had longer connecting rod and lasted long life.. You can see there are some old enginer are still running well as new.

Jens Eirik

I blame the synthetic luboil they recommend (and use).

I was wondering about the oil....it didn't seem to have much film strength or lubricity. []

The oil they recommend and use was Castrol Magnatec.Too thin in my opinion.Maybe right for rather cold country as Germany but not for Turkey.

OK!

Rajeev asked the question and received an overwhelming answer, that the break-in attitude doesn't matter.

Let's all get on with it.

Get on with what? Who died and left you in charge DraZeelon?