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Author Topic:   Burnt #5 plug again??
dirtracer14
Member
posted July 25, 2004 11:23 AM
We got are good motor back in for last night after losing #5 valve from what looked like a break wich cracked the head. So we get another head and try it agian after about 6 laps i lose the same #5 plug the inside is broke about half way up in the plug...the reat on the side look ghost white. I ran this motor on a slick 3/8 with no problems for 6 nights.. Now at the other track it is bad fast and in the gas allmost all the time just a tad lift for the turn then hard in it. Now i am thinking that i am leaning the motor down ...but the temp was fine...do i need more jet of more pressure. I have a kse that with my other motor would have 7 or so pnds on the straights but didnt have a chance to look last night?


cobb
Member
posted July 25, 2004 03:55 PM
maybe the intake gasket is leaking around that port and leaning that cylinder.


dirtracer14
Member
posted July 25, 2004 08:22 PM
I did check that and it may have been part of the issue....they are ported way out and not much left to mate at the bottom...after looking things over real good it looks as if the intake might not of been set on even for both sides..


awkwardjeff
Member
posted July 25, 2004 10:25 PM
14, My long lost friend......set the intake on WITHOUT gaskets, you should be able to slide a .018 feeler gauge in the ends...front and rear, If not the intake is bottoming out on the top of the block NOT allowing the inside of the intake to seal.

Is the intake full of oil when you take the motor apart?? that oil aint from the #5 hole only......the intake sounds like it's pulling air/oil from inside the motor.

You put orange stuff on the ends of the intake when you put it all together.....how thick is that when you take the intake off?? nothing left I suspect.

dirtracer14
Member
posted July 25, 2004 11:05 PM
Hey jeff whats up.... well i do have a bit of goo on the ends when i take it off 1/8" or so. They both have been ported to the 1207 intake gasket wich dont leave much at the bottom to seal. I really took a look at the bottom of the intake runners and the gasket to see where it was sealing ...and i may have not got the intake on right....Im no motor guy i get in to much of a hurry. I think that the plug went after the head gasket ...the gasket was gone about 1 1/2 between 3 and 5 . the tops of 3 and 5 were darker than the rest so maybe it was leaking some oil in....i should have it back together this week and i will double check the intake before reinstall and i will be going up a few jet sizes and checking to make sure i have enough fuel pressure.

BTW my dad has retired and is a long haul Auto trans port guy now and is back there allot now...owner operator deal...could save on shipping LOL

NJantz
Member
posted July 26, 2004 08:49 AM
14, the only thing I would add is with a 1207 there aint much left to seal.... you got that right.... I would re-tighten.. re-torque the whole intake after motor has been heat cycled once........ just a little bit might help.


dirtracer14
Member
posted July 26, 2004 08:45 PM
I will be taking a bit more time getting the intake on this time...would it be ok to add some silicone on the intake around the runners on top of the gasket? Another one for ya i got the package the head gasket came in...was pretty old and reading it said re torge after warmup is this a old gasket or do they all say that? I dont have the new one yet or i would read it myself?

BTW i think my old man is heading to Mn this week

KPLugnut
Member
posted July 27, 2004 07:13 AM
Jeff,
Sorry I missed your call, I've been away for a few days and just getting back to speed here. I think you're onto something with that intake gasket, as I don't see the carb being able to consistantly do that to JUST #5 all the time.

Keep us in the loop, ok?

Thanks, and sorry again for missing your call.

KP


dirtracer14
Member
posted July 27, 2004 08:19 PM
That was me that called KP. I think that with my new motor i an leaning out the top end....all the plugs were ghost white when i pulled em and that was after a few caution laps and idling back to the pits after it blew. The new motor is a real flowing piece and with the new rear susp i can stay in the thottle long and get back in it harder and faster than anytime befor. What would be to much jet for a 355 with all the good stuff? When is a good time to call? Thanks, Craig Moore


KPLugnut
Member
posted July 28, 2004 07:12 AM
OK, those details make more sense now. it's definitely gotta be upgraded, I am sure. I can't recall now if your metering blocks were using the aux holes above the std 1/4" jets or do they have the large 5/16" alky jets? Big difference as to where ya wind up with jet numbers.
Call me during the day at 607-266-3129 (but I'm NOT supposed to talk long there, since it's my day job and I get busted by the boss occasionally LOL).
Call between 9am EST and 4:30pm EST. If ya miss me, leave a # and I'll call ya back.

Dayton.


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