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Just curious what the average temp i should be looking for on this engine? I am on the 3rd tank of break in and im just idling, its around 280ish, does this seem high? What is the MAXTEMP i can run safley?I am using the recommended plugs, its in the high 80's here and very humid. Ihave sealed the back plate and the carb neck (gasket seal stuff, maybe i should check it again). Everything is good a tight. I checked the tank for air leaks and the engine as well, i can not find any, and there is no extra fuel being spit out around the frombearings, or any other place. I am usingDynamite MC-59 McCoy Power Plug(DYN2508). Oh and the RTR mounts work like a charm with this engine and its pull start. Iam just worried about the engine temps tho. Its a brand new engine. Iposted in the engine forums and didnt get many replies, i have looked over everything posted about this engine. Any thing you guys can give me on this would be appreciated. Someone mentioned wrapping the head in foil, wouldnt that make it hotter? This is about the 3rd engine i have broken in for RCCARS, everything else had been Heli.Also can you use Short and Long plugs in this engine?

Valdeck

Hey man,

I did a little digging for you, over on another site I found a thread about the mach .28 engine temps. Apprently the over all range is something like 240-300 (I am clumping together a few numbers there). Either 240-270 or 260-290 I hope that helps. Basically be concerned if it breaks 300 I suppose about you can expect it to hit at least 250 it looks like.

Valdeck

for good measure here is the link http://www.rcnitrotalk.com/forum/showthread.php?t=42137

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ah, guess i could have looked at other sites, thanks for looking around. Yeah it just worries me, i was starting to think that maybe i made a bad choice. I am still not convinced. Ill do some more digging myself, if you run across anything else let me know. Thanks!

Valdeck

no worries ment, you helped me out on my thread just wanted to return the favor man. I tried checking here but not much came up so yea I figured might as well look. In all honesty I have never used that engine but from what little experience I do have I would have to say that basically like 225 to 275 or 300 is ok but the upper end of that might be pushing it.

As long as its running and sounding good some times they just like to run hot not much you can do but see if it last and replace the piston and sleve lol.

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if i take it apart and look at the piston and sleeve, what would be an indicator that the engine is damaged? Anyone?

Valdeck

That one is probably best for the engine forum but since you asked. A few basic things would be...

Scratches on the piston or sleeve
Deformity like bulges or depressions
Nicks in the wall of the sleeve or chamber the piston is in.

Pretty much anything that makes it not the smoothest thing you have ever seen that might be a little over stated but you get the over all idea. Dont take over heating as a sign of a broken engine. Its not uncommon for engines to run hotter than your comfortable with. My GST is that way and my revo can cook bacon if I let it.

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Yeah i need to post a few things on my revo. think ill head on over to the traxxas side and do that. see ya there!

HerrSavage

The Mach 28 has nothing to do with the Mach 427 - especially if you're talking about the Hobao Mach 28.  That engine is notorious for running very hot(and sucking..)

280 is definitely too high for break in.

My first guess is that your temp gun is off.  When it reads 280, spit a glob of spit on the end of your finger, and then let it slide down the cooling head to the plug.   If it's really 280 it'll sizzle away within like 1-3 seconds..  Ideally it should take a few seconds and slowly sizzle away.  If it doesn't sizzle at all it's too cold.

But 280 for break-in tank 3 is too high.  Something's wrong.

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Is 280ish a engine killer temp for the mach?

Valdeck

I would go with what savage said, I fully admit the mach is not a engine i know much about. For break in it probably is to high, you can try riching everything out and see if that cools it off but for regular running when your going mostly WOT I would say it might be whats to be expected. Though honestly a lot of people on here seem to suggest like 200 or 225 for break. When it comes to break in there are more theories than people I think.

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Val that is very true. I have a feeling that my gun may be off, if so a waste of $25 Well ill try a few things tomrw if the weather isnt to bad, supposed to rain for the next few days, but i could open the garage door and just do some more break in. i want to idle a few more tanks so should be ok for that. Herr what glow plug ya think with this engine? Iknow u have a lot of experience with it.

HerrSavage

I raced my RC8T last weekend, and came off the track after a 30-minute final temping at 235.  IMO I don't like to see my Machs or LRP over 250 ever.

You need to do that spit-test or try a new temp gun before doing anything else.

What temp gun do you have?..  Lemme' guess - Duratrax Flashpoint??....

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Nope, LOLi have the Dynamite mini temp gun DYN2529.

http://www.amainhobbies.com/product_...-Mini-Temp-Gun

HerrSavage

Hmm.. Then just find somebody with another gun at the track or whatever, or just do the spit test. Also, when it's up to temp and reading 280, see if you can touch the head without it hurting too much.. 280 should be too hot to touch.. 220 or so(ideal) should still be hot, but not as painfully so to your hand as 280.. At 220 you should be able to hold your hand (lightly..) on it for 2-3 seconds.. At 280 you'll jerk your hand back immediately.. (Be careful, don't go burn yourself cuz you read this.. I'm approximating from five thousand miles away..)

So first off you need to confirm the temp readings. After that, it's up in the air.. Head screws tight, backplate on right, pipe gaskets OK, clutch and bearings OK, etc etc??

HerrSavage

Is it not spitting fuel out of the pipe? It should be...  Did you mess the needles??  Maybe your HSN is just way too lean?...

There should be oil spitting out of the pipe.

What fuel are you using?

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its spitting fuel out of the pipe, im using nitrotane 20% race, should there be smoke when idling? or will u only see the smoke with increased RPM? but yes there is fuel spitting out the pipe and some sitting inside, i was able to pour a little out of the pipe when i turned it over on its side.

HerrSavage

Well that's good then.  Nothing to do IMO before confirming the temps..  Once you'v done that you can start troubleshooting in other areas if necessary..  My guess is a faulty temp reading though..  But who knows..

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should there besmokewhen idling? or will u only see the smoke with increased RPM?

Valdeck

http://www.rcuniverse.com/forum/m_8748656/tm.htm

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Valdeck thanks for the info man. Once u get you Z-Car you should come to race at our track it isnt to far from you. Its 5-6 hour trip, for a great weekend of racing.

Valdeck

Sure, I can work on that see if I can find a cheap place to stay lol not gonna drive ten hours in a day for 2 hours of racing. I want to try and get a sponsor at some point but I hae no idea how to go about that and I am probably not good enough just yet.

chaserogesr14

thats without really even running but just idleing isnt it