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Author *Topic: Light puttering under idle  (Read 2444 times)
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XTRevolution(25) ChrisInVT(13) SofaKingWeToddDid(11) TehWinGTP(9) RobertISaar(7) Prospeeder(6) 3.1cutlass(3) WhattheFehl312(2)
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XTRevolution
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« Reply #60 on: April 06, 2010, 04:00:29 PM »

Got some more porting work done today.

There are some pretty big casting imperfections that I smoothed out. Keep a close eye on the before and after shots of the floor of the intake ports, and the edges of the exhaust ports near the valve seat. Also look at the casting around the valve guide.

Ridges on the exhaust port:


Ridge on the floor of the intake port:



Casting around valve guide:


Other rough casting imperfections:



After shots:









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« Reply #61 on: April 06, 2010, 04:07:14 PM »

looks shinier
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« Reply #62 on: April 06, 2010, 04:08:33 PM »

looks shinier

as we all know, shinier = faster.

the only exception to this is low-gloss/no-gloss stickerz.
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« Reply #63 on: April 06, 2010, 04:13:46 PM »

so, matte stickers will make my car faster? smile
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« Reply #64 on: April 07, 2010, 01:54:10 PM »

as we all know, shinier = faster.
\

Paint the whole car chrome, that'll add +1000hp
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« Reply #65 on: April 07, 2010, 07:59:25 PM »

\

Paint the whole car chrome, that'll add +1000hp
1000lbs maybe, if you use actual chrome! haha
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« Reply #66 on: April 12, 2010, 10:38:46 PM »

Got some more progress done today.

Before:






After (I lapped the valves after this):










Heads are now torqued down, and I got the first set of rockers on. Then I realized it was 11:00 so I called it a night. I'll finish the car tomorrow.






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« Reply #67 on: April 13, 2010, 04:17:09 PM »

engine looks nice n clean
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« Reply #68 on: April 14, 2010, 05:23:01 AM »

On a side note, I did the dollar trick on my Lumina and it didn't suck it back in, so I just have a slight misfire when the engine is cold. Probably a coil pack getting ready to bite the dust.
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« Reply #69 on: April 15, 2010, 07:19:34 AM »

I finished the car last night. First thing was a lot of smoke from the engine bay from all the oil and coolant and whatever else was on the manifolds burning up. After that it was fine. Idle vibration is rough, but that might be because I messed around with the upper intkake insert and modified the runner lengths. It accelerates a lot smoother than before though, and there's definitely an increase in power from 3500-5000 rpm from before.

Also, I have a consistent and repetitive shuffling sound coming from the engine, which is louder on cold starts. Not too sure what that might be, but perhaps it will go away after I run a bottle of seafoam through the engine and change the oil afterward. There's also the exact same light clanking sound as I heard before I replaced the heads. I've been told it could be a stuck lifter, but who knows. I didn't bother to pull the lifters to check them, as I was too preoccupied with trying to get the car running again.

Any thoughts?
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« Reply #70 on: April 15, 2010, 01:48:26 PM »

Also, I have a consistent and repetitive shuffling sound coming from the engine, which is louder on cold starts. Not too sure what that might be, but perhaps it will go away after I run a bottle of seafoam through the engine and change the oil afterward.

I haven't found the source of my clicking when the engine is cold in my car, I've decided with 251k on it; it's allowed to make some funny noises as long as it still runs fine. I thought it might be a misfire due to a failing coil, but when the engine is warming up you can hear valve rattle so I don't know...
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« Reply #71 on: April 15, 2010, 01:53:34 PM »

I haven't found the source of my clicking when the engine is cold in my car, I've decided with 251k on it; it's allowed to make some funny noises as long as it still runs fine. I thought it might be a misfire due to a failing coil, but when the engine is warming up you can hear valve rattle so I don't know...

Well I figured out what it was. Stuck lifter.

I'll try draining a quart of oil and putting in a quart of trans fluid in tonight to see if that frees up the lifter. I figure after replacing the heads with 85k mile heads, lapping the valves, and with my roller rockers in there, there's not a whole lot else that it could be. This might also explain why my idle vibration is so rough.
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« Reply #72 on: April 15, 2010, 01:58:33 PM »

What a bitch, after such an involved teardown...
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« Reply #73 on: April 15, 2010, 02:03:23 PM »

What a bitch, after such an involved teardown...

Yeah no kidding. I'll try all the solvents I can think of to free that shit up before I tear the LIM, valve covers, and rockers off to figure this shit out.
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« Reply #74 on: April 15, 2010, 09:19:01 PM »

old lifters will loose thier prime too and make noise, which ATF wont fix, I like using Lucas Oil additive it helps lifters hold thier prime. I use it every oil change on my 6000 and it quieted to 240k lifters down pretty well. I use 3 1/2 quarts of 5w30 and 1 quart of lucas
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