slskn

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. Okay finally found the problem my cam lobes are worn actually looking inside of the hole in the guide cam pin follower guide shows a hole in on the cam lobe as if somebody drilled a hole into the cam lobe, and the push rod looks like it's been hit hard it's flared out on the end, so sent it to horizon to be repaired

slskn

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https://youtu.be/zebWS3i-x38
thanks to Tom maxam, for the work he's done getting the cam unit back in, engines back in the plane and ready to test fly again, seems to run good so far will post a test flight when I get ready.

slskn

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[QUOTE=slskn;12453971]https://youtu.be/zebWS3i-x38
thanks to Tom maxam, for the work he's done getting the cam unit back in, engines back in the plane and ready to test fly again, seems to run good so far will post a test flight when I get ready.
​​​​​https://youtu.be/VOhnP_eBL-w
Anybody in the UK know where I can get some Cam pins brass guides for the 9 -9 9, also looking for a cam and a Cam ring gear??

Mark Bartley

Question for Tom and maybe others.

I've got my 7-35 broken in nicely, and are readying to put in my aircraft.

It's still nagging me that the engine RPM maxs out lean, on fuel draw, at about 3/4 carb opening.
Yet we are not using the muffler pressure to deliver the extra fuel the engine seems to want.

If fuel tank contamination is the worry I can ,easily develop an effective exhaust pressure filter system or, use a bladder tank, or pump, etc.

Am I missing something?

Thanks,
Mark

cymaz

BobH

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Maxam

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Mark Bartley, use the carb for the Saito 90r3. You will need to make an adapter. -Tom

Mark Bartley

cymaz:
Yes, I'm using the collector ring that has a pressure nipple, and could use extra pressure, but....

Max:
Why should I change carbs? The stock carb runs and transitions well, it just seem to want more fuel on the high end.

Thanks again,
Mark

BobH

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Maxam

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Mark, the 7-35 carb cannot deliver the fuel the engine needs then it is worthless. How to ruin an engine?; run it lean at full throttle. I have had two 7-35's both engines carbs could not deliver fuel at full throttle. The early 7-77's had the same problem until the choke area was reduced. -Tom

Linkan2

Hi Mark
I think I'd be the first to reverse the carburettor from Saito.
Which I do not regret has had a carefree flight with my 7-35.
I just had the problem on my engine that you describe.
so I can recomend switching to fa120r3 carburettor.
Have flown with my now for 2 years without any problems.
Lars

bpotter

Hi - Thanks for the forum and expertise! I have read with interest about replacing the stock carbs. I have the Evo 9-99 and have about an hour to hour and a half of bench time break-in on the engine. Really like it! Most of the carb replacements that have been mentioned are on the 7-77/7-35 engines. Is the same Saito fa120r3 carburettor correct for the 9-99? Same adapter from CH ignitions?

One other question while I am at it. I have it idling well and smooth at rpms up to about 4000. However, when I go to full throttle, it dies. Suggestions?

Brad

slskn

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Make sure you're using the large fuel tubing sounds like you're not getting enough fuel may have to open the needle valve a little bit more until it runs very rich then start leaning it out

Mark Bartley

Hi Guys:

So I've installed the Saito fa120r3 Carb on my engine.
I can now richen the top end to the point of slobbering rich, but the top end RPM still hasn't changed.

I'm running Cool power, 10% Nitro, with Castor added to 22% up to oil.
Then cut with 1 gal of methanol to get 5% Nitro with 11% oil.

I broke the engine in on a 17x8 Xoar, and am now running a 17x10 Xoar.
Max RPM is 5400 with the 17x10. Any suggestions to improve?

What RPMs are you guys getting from your props on the 7-35?

Thanks,
Mark

thechromeshop

Hi my name is Robert Coleman. Im 61 and beem flying since I was 6 then again at 11 23 57 now again at this age. Ive been in and out of the hobby. `But have had several hobbies going on at the sa,me time.Motorcyles and target shooting being others. Last yr I splurged and bought a evolution 35cc radial. I was rather dissapointed to find out LATER on that no parts were available. So I sold it. Ive always been the type of guy that worked on my oun stuff cars and bikes .Ive thought about the radials and would have another one IF PARTS were for sale. I dont like the idea of having to send in my anything to be looked at. So with that said does anyone feel the same way? And are parts going to be available for ANY radials that are affordable. Successfull flying guys. Bob

thechromeshop

Sir I have a 35cc and the cam and the cam follewers were worn out. After 4 hours running in the test stand it lost 900 rpms. The H-H people could not find ANY PROBLEMS. I finally figured it out. And now run strait glow fuel with 18% oil .No problems after 74 flights. Bob

barzini

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Bob,
Where did you get the parts?

Linkan2

Hi Mark
Do you have controlled valves (0.10mm)
I have 7% oil and 5% nitro in my fuel!
Now to the carburettor (same as yours) at about 7000 rpm 18x8 prop.
Then the main needle is about 1 1/4 turn out.
And idle needle is richly adjusted from factory.
I could adjust that much
Lars

Linkan2

Parts I buy from UMS in India
[email protected]

Mark Bartley

Hi Lars
Yes, valves set as per Maxam's write up. (0.005")
I have similar needle settings as you.
I just tried running the engine with a fresh mix of 8% Oil and 5% nitro.
Same thing, 5400 with a 17x10 Xoar, and 5800 With a 17x8 Xoar.

BTW, my buddy and I bought a pair of these engines at the same time.
His engine is acting the same way, just no power.............??

Thanks for any feedback,
Mark

Mark Bartley

Hi Bob:
How can you tell if the Cam Followers (I assume you mean Cam Follower Pins) are worn out?
The Test sheet that came with my engine showed a 18x6 Menz turned 7,000 RPM.
I can't get an 18x6 MA past 5800 RPM after 2 hours of break-in.
I've tried everything I could think of, but the Cam Followers isn't something I considered...

Thanks,
Mark

Linkan2

Hi Mark
One question what do you have for glow system & how many mhA do you have in the battery?
I have a microsens system, Glow7LP with a 15000 mhA lipo battery
Lars

Mark Bartley

Yes, my glow works well (4200 mah, 3S LiFePo4)
Converter O/P is a solid 1.5V at each plug and all plugs glow bright red.
Engine starts great and all exhaust pipes are hot....

Mark Bartley

Hi Guys:

I guess it doesn't matter anymore.
I was trying a few more break in runs at 1/3 to 2/3 throttle when the engine abruptly stopped, and threw the prop, driver washers, nut, and "C" clip about 60' down my driveway.
The engine is now locked up solid and feels like something has mechanically let go inside and jammed the internals from rotating.
My dream of owning and running a radial has come to an abrupt end after investing $2,000+ in the engine, carbs, fuels, glow drivers etc.

Thanks to everyone on this forum for your support and efforts, but I'm tapping out. I've spent too much time and money on this, and lost lots of prime flying time this summer.
If I can't unload it as a parts engine then I'll just hang it by a noose in our club house.

Note to those reading this thread and considering the purchase of a 7-35:
- I've been running and flying glow engines for over 40 years without any problems;
- I'm a tinkerer and I admit to getting caught up in the romance of running a radial engine;
- I had no idea of the commitment to make this dream a reality;
- I have spent many many hours reading forums, buying all the required accessories, mixing fuels, lubing valve trains and judiciously following the break-in regimen; and
- I have lost uncountable flying hours and become very frustrated trying to be successful.

Please be absolutely sure that you're fully prepared for any outcome, and totally committed before putting down your hard earned cash.

Thanks again everyone and best of luck with your Evolution radials.

Mark

BobH

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