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HelicopterMain Discussion › To Shim or Not to Shim that is the question
01-23-2007 11:30 AM  10 years agoPost 1
brianbruff

rrApprentice

ireland

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Hi all,

Don't want to start a big debate here, but running an os91szh ring on CoolPower 30% nitro Irish climate.

Should the extra shims be added?

50% of people I meet tell me Hell ya! and the other 50% say jasus no!

Is it a case of "If it's not broke don't fix it?" i.e. no pre detonation?

I've had it running with no extra shims and tried it with one shim and I didn't notice any difference, I'm now back to no shims and hope to leave it this way unless I notice any obvious problems?

.... so I guess my question is ....

Is there anyone around that run the same engine with no head shims on 30% with out a problem?

If there is then this is good enough for me.

I smile, cause I've no idea what's going on.

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01-23-2007 03:16 PM  10 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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No shims, ran fine.

That being said, get a shim, try it for yourself, if you dont like it get rid of it, its not like you welded it in there or drilled a hole in the crank case or something.

Andy
AMA 77227
http://www.jaxrc.com

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01-23-2007 03:37 PM  10 years agoPost 3
flybarless

rrKey Veteran

Torrington, CT

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I'm running 2 on CY 30%, no shims, no problems

Just remember -- if the world didn't suck, we would fall off.

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01-23-2007 03:47 PM  10 years agoPost 4
brianbruff

rrApprentice

ireland

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Tnx

Excellent, two replies that's good enough for me, I'm leaving my shims off because it appears to be going fine, main reason i asked was this is my fist 90 machine and I worried about the unknown.

tnx alot
Brian.

I smile, cause I've no idea what's going on.

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01-23-2007 07:15 PM  10 years agoPost 5
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i wasn't running an before with no problems. but i was told that by putting in some shims, it will help the starter get the motor running. but i have yet to put that to the test. i think with the Viper heads you should be running shims because they are made a little different then the stock heads.

Shawn
Team Leisure-Tech
Team HelixRC

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01-24-2007 08:45 AM  10 years agoPost 6
brianbruff

rrApprentice

ireland

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Easy start

Would you believe that's the same reason i origionally put in the shim, turns out it didn't solve the problem.

my problem was that the mpII was leaving oil run back into the chamber after the last flight of the day and hydrolocking it.

once i understood what was really happening then i've no problems (especially now with a dynatron on 19.6v as well)

tnx
Brian.

I smile, cause I've no idea what's going on.

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01-24-2007 02:48 PM  10 years agoPost 7
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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yeah, i solved that problem with the MP2 by tipping my model sideways so nothing backs into the engine, 90% of the time it helps get the motor to turn over.

Shawn
Team Leisure-Tech
Team HelixRC

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HelicopterMain Discussion › To Shim or Not to Shim that is the question
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