Kmot

My Feedback: (24)

For the Hobbico batteries, make sure you wire them in PARALLEL. Pos to Pos and Neg to Neg. This will keep your voltage at 1.5V but double your available amperage.

Connect one neg wire from the battery pack to the frame of the engine mount.

Connect the five glow plug leads together, and then attach that harness to the Pos lead of your battery pack.

asp400oswankel

Yes,I did actually fill it with oil so that might be the problem. Also, how doI wire the plugs to the 1.5v batteries with the standard harness? Thanks.

Kmot

My Feedback: (24)

As far as mine was concerned, there was no "standard harness". Just five seperate glow plug leads. I made my own harnesses.

asp400oswankel

Great News- I actually got it to run for a bit! Adjusting the air fuel mixture is quite difficult. What is a good starting point to begin tuning at (turns open)? Thanks!

Kmot

My Feedback: (24)

Cool!

Sounds awesome, doesn't it?

When I first started mine I set the HSN according to the manual, and IIRC it was 3 turns open from seated. But I eventually opened it up to between 3 and 4 depending on the weather.

MarvinE255

My Feedback: (10)

How is everyone setting the valve clearance? Since as you rotate the prop a different cam opens the valves. You will get 3 different gaps till your back to the original. Which no.s are you using, I was told to use the smallest set of intake and exhaust values.for each cylinder. Doc

SJN

Yes, I adjust mine on all 3 cams, as they are not all the same [&:]

At first I only checked once, but later was puzzled about why my clearance was so much off wehne messured at a later time.......chinese quality...

Im just using the feeler guage that came with my saito engine.


I just opened up my engine, and it looks fine inside.....
The 9% castor and 9% synthetic oild and 5% nitro fuel seems to be allright on the insides of my engine.
Coolpower is a killer....rust everywhere.

But the large bolt holding the master pin on the crankshaft was loose.

MarvinE255

My Feedback: (10)

My question is if you adjust it on cam one then go to cam 2 and adjust it again you will have changed the setting for cam one. You start with 3 different sets of valve clearances but only can set the valves once. This setting will apply to all three cams. So how do you choose the best setting that works with all 3 cams? Doc

The Raven

I don't own one of these engines but I would probably set the valve clearances for the tightest lobe. Unless something is way off, all the other lobes should then run within the allowable tolerances. The trick will be to discover which lobe is 'tightest'.

SJN

If I chose the wrong cam, then the clearance will be too small, and I can not insert the feeler guage in one of the 2 other cams....or in between the cams it is, as the valves are closed....
The gap will ofcourse be too large on the other two......but rather that, than a valve that does not close tightly.

But that is just my engine.
Maybe yours is built better..

Have you tried messure the different clearances on your engine Tom ?

Kmot

My Feedback: (24)

What the he!! are you guys talking about? 3 cams?? [sm=confused.gif]

There is one cam drum.

The cam drum has two cam rings.

Each cam ring has three lobes.

Stop confusing me!!

When I adjusted my valves the first time I found them very much out of specification. After the overhaul, I adjusted them doing cylinders 1 thru 5 in order. Then I went around again in the same direction of rotation and checked them and they seemed good. After running the engine I checked the valve clearances and found some had loosened up so I re-adjusted them. After running the engine again I checked the valve clearances and they were still good.

This engine does not have three cams as I explained. And each cam ring's lobes should be identical. The usual reason for the clearance to get out of adjustment is the normal reason, which is hot/cold cycling of metal parts. However, mechanical wear such as a tappet going flat or a cam drum lobe wearing down could also cause the valve clearance adjustment to fall out of spec.

I wish this topic had been brought up when my engine was in parts. I would have set up the cam drum in a jig and used a dial indicator to check the lobes.

SJN

mine must be off center or somthing then.

Its in between the lobes that is different on my engine......when the valves should be resting in their seat.

Kmot

My Feedback: (24)

Hmmm, that is interesting. Did you ever have your cam drum apart?

These are the best pics I have of the cam rings. Everything looks concentric and equal to me as far as I can tell.

asp400oswankel

It sure does sound awesome! Nothing like the roar of a radial. Idefinately need to get an exhaust ring. I'm planning on making a concept vehicle, similar to the 1935 Monaco Trossi: http://www.omniauto.it/foto/popup/79...ereo-senza-ali
Also , it there a spacerI could buy to correct my valve gaps whenI bolt them down.

asp400oswankel

IS there a spacer... excuse my typing!

Kmot

My Feedback: (24)

I have seen that experimental race car before. Making one for a model radial engine would be fantastic!

I don't know of a spacer?? Valve gaps when you bolt them down? Are you maybe talking about a gasket for the valve covers?

asp400oswankel

For a spacer, I meant like a file that is a certain thickness (in this case 0.01mm) to slide between the rocker arm and valve when setting the gap. If this is not how it is done.. how do I check / set valve gaps properly?

Kmot

My Feedback: (24)

Ah so. What you need is called a "feeler gauge".

You can buy them cheap, or expensive. The cheap ones work fine. You will also need a small slotted screwdriver and a small hex wrench to loosen the adjusting nut.

Here are some inexpensive tools that will do the job:

http://www.harborfreight.com/32-piec...uge-32214.html

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHGC1

The Raven

I know that OS Engines sell a set of feeler gauges and tools to do this job. Saito would probably have a set as well. It isn't very expensive and will suit other 4 stroke engines. As Kmot indicated, you can use car feeler gauges and some small screwdrivers and wrenches (we call them spanners in Australia - although I use both terms).


I use automotive feeler gauges, a 5.5mm wrench (that came with an RC Car), and a screwdriver.

MarvinE255

My Feedback: (10)

Tom to be complete you need to measure the valve clearance on all 3 lobes. I used the wrong term when I said 3 cams. Mine are quite different. I set the tightest lobe to spec which left the other lobes with larger than spec gaps. I was wondering if this was the best approach. Thanks

Kmot

My Feedback: (24)

Is it 5.5? I forget.

Anyway, I don't agree with the notion of adjusting a single set of valves three times on three lobes. Does not make sense to me because the lobes are not different heights.

Here is the OS 5-cylinder manual and the ASP 5-cylinder manuals. You will notice in the valve adjustment instructions it makes no mention of adjusting "all three lobes". I'm sorry, but that is just not correct. If your adjustment changes each time your rotate the engine, then maybe your cam ring is not concentric and should be replaced.

Kmot

My Feedback: (24)

I just re-read your post Marvin. It seems your cam ring is defective. I suppose what you are doing is the only way it can be done on your particular engine.

SJN

Heres a video of my valves.....not the best quality, but I hope you can see it.


First messurement: in spec at 0.10
Second: is a little loose
third: very loose
fourth: in 0.10 spec again, as it is in te "first" position again


you will probably have to doubble click on the video and fullsize it to see the rocker arm play


[youtube]http://www.youtube.com/watch?v=GVtynLPfP1k[/youtube]

MarvinE255

My Feedback: (10)

This is the same situation I tried to describe. Great demo of the problem. Solutions?

nilsreinert123

this is one of the reasons why my 400 also stop after getting airborne ! there are large tracks in the the cams after the pushrods. The lobes are actually different wore .
I am replacing it with a saito 200ti in my 80" FW 190 , which also is a very good sounding machine