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Old 07-01-2008, 04:13 AM   #1
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Default Killing glow plugs somehow

Hey all

Helping tune and seal up a Team Infinity Samurai 521 that has been modded a bit..

It wasn't running that great and i tunned it up a bit and it holding temp around 110c now and going pretty good. I had to wind out the MSN a very small amount as the HSN was only just kicking in at high rpm..

It is killing glow plugs very often though. using standard OS #8's and we have tried cooler plugs also with no luck.

I cant think of anything out of the normal except we are using a old RTR type ehaust which is just fully open and loud! we have a jp3 on the way...

Is there anything i should be looking at specifically?

The plugs appear slight carboned up, the last spring is out of shape a little bit and they will onlu glow the first couple rings...

thankyou all please just list the things you would be checking..


ps. this engine has never been in a good state. it has only about 3-4l through it and has been hard to tune since new. well it tunes fine but then runs hot or if tuned to run at a normal temp it doesnt quite run great and the plugs go real quick. in the 3-4L i think we have used near 9 plugs

in that time my vspec is still on its first!

thanks
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Old 07-01-2008, 05:45 AM   #2
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Your sure the LSN isn't set too lean ?? I find thats the normal cause if I start eating plugs !

Just a thought

Rod
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Old 07-01-2008, 06:21 AM   #3
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i am fairly sure its not. I give it a good run then count a couple seconds and then hit it and it has a good amount of smoke coming out. I have only just gone past the point where it is bogging off the line..

i was just about tot ry the pinch test when the last glow plug died
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Old 07-01-2008, 06:40 AM   #4
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CON ROD OK?
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Old 07-01-2008, 08:48 AM   #5
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If the plug is carboned up you may still be running too rich. Make sure you have fresh fuel.

You state that the motor is new, but how old is the car it was put in? Check for air bubbles in the fuel line, pinholes happen and can really mess up a tune. Or if it is a season or two old, just replace the line. Quick $5 fix

Also it helps to replace the o-rings on the high and low needles as they get hard and leaky with age and heat. Quick $4 fix
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Old 07-01-2008, 09:24 AM   #6
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im quite sure my mate had one of those motors a while back he could never tune it properly and it would just not run right no matter what he tried i think he gave up in the end, sorry not the answer you want
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Old 07-01-2008, 05:49 PM   #7
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thanks for you answers guys. the buggy is a new 808 and the conrod does have a fair amount of slop in it considering the engine is fairly new i was surprise at the amount of slop!

I am going to wack a sapre vspec carb on it and also try a os speed mag head and turbo button see if that helps...

lol its a black block too so its gunna look like a os speed just not run like one..

though this engine is quite fast and keeps with my vspec just doesnt have the punch off the line..
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Old 07-01-2008, 06:25 PM   #8
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One way to tell is buy looking at the wire in the plug compared to a new one. If it looks like its pulled out, you're too lean. If its pounded up in, you're too rich. This can give you a starting point. But if all else fails go richer, plus try the factory settings. They tend to be on the safe side.
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Old 07-01-2008, 06:45 PM   #9
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i tend to agree with the "rod theory"....i was blowing plugs every other run for 2 weeks with a loose v-spec rod. Didn't take much.
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Old 07-01-2008, 06:51 PM   #10
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Had the same problem this weekend. The cause was the con rod bushings.
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Old 07-02-2008, 01:13 AM   #11
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thanks guys

its not worth it to change the conrod on the motor as its only a cheap motor til he gets a new better motor.

whats an easy fix, how bout adding a shim or maybe trying two glow plug washers?

i am guess the slop in the rod is allowing the rod ti rise higher causing the problem?


cheers
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Old 07-02-2008, 05:41 PM   #12
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I have a Top motor I bought used that blew glow plugs frequently. Once I took it apart for a look-see, I found out it didn't have enough shims. Once I corrected that, all is well.
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