plumkrazee70
Well-Known Member
Absolutely.
340 Engine Shake
- Thread starter plumkrazee70
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Absolutely.
Dan the man
Well-Known Member
I got the cart in front of the horse
plumkrazee70
Well-Known Member
Here are the pictures of the teardown. Ran out of steam tonight. Still have to remove oil pan and check bearings.
What has me concerned the most is the combustion chamber of the cylinder heads and the cylinder bores. Did I lose a head gasket? It looks to me like coolant was getting in one or more of the cylinders. Not sure.what to make of the cam lobes.
What has me concerned the most is the combustion chamber of the cylinder heads and the cylinder bores. Did I lose a head gasket? It looks to me like coolant was getting in one or more of the cylinders. Not sure.what to make of the cam lobes.
plumkrazee70
Well-Known Member
That's what I was wondering. What do you think of the combustion chambers on the heads? Looks odd to me, but I'm no engine builder.
512Stroker
We are all here because we are not all there.
I like this Guy, he has a good attitude.
512Stroker
We are all here because we are not all there.
The staining in the head pockets does not look like rust from coolant, I would say that is fuel coloration caused by uneven fuel distribution from the intake manifold. Those cylinders are a tad richer than the others.
The pattern on the cam lobes looks normal.
The lifter bores will need to be measured to see if they a within spec, remember that the lifter must be able to rotate in the bore, if it does not it will wipe that lobe right off the cam in a short amount of time.
It's all a big POS. Box it all up and send it to me.
Inertia
Well-Known Member
I like to make acoupla strokes in the lifter bores with a brake hone, to ensure lifter rotation.
Those look virgin .
How do the bottom of the lifters look ?
jmo
Those look virgin .
How do the bottom of the lifters look ?
jmo
trapster
Well-Known Member
On another subject, is it wise to run a dual plane intake on a throttle body injected motor? I dont think the TBI knows which side to spray in, so it sprays fuel even on the sides not sucking air. This could cause poorer performance on the low end. Just a theory on mine.
TT5.9mag
Two atmospheres are better than one
Look at both sides of the fire ring on the head gaskets. That will tell you if it’s passing coolant. There is definitely some weird distribution, and possibly steam cleaning. I thought your mechanic verified a wiped lobe on the cam?
plumkrazee70
Well-Known Member
I'll post some pictures of the head gasket. Well the tech thought it was bad lifters at first. Mainly because, they would clater when started up cold along with the tick when the engine would shutter.
After pulling the intake to replace the lifters, he didn't like the wear pattern on the cam, and that lead him to drain the oil and cut open the filter which revealed the glitter in the oil. He didn't say we lost a lobe we just assumed by all the glitter.
plumkrazee70
Well-Known Member
I've read it both ways and the efi manufacture says its fine to run a dual plane. I actually have a 1" spacer to help with the distribution.
trapster
Well-Known Member
Well a Carb only supplies fuel to the barrel that is being used, but a tbi blows fuel in all barrels whether they are being used or not, so with a spacer you will still have too much air in half of the carb and not enough in the other. I would think this would cause some kind of imbalance.
plumkrazee70
Well-Known Member
I'm no expert and yes there is tons of threads that argue with ways. But Fitech themselves and our own board seems to agree it doesn't matter. edelbrock air gap divider and FITech
trapster
Well-Known Member
I only brought it up, because, it potentially could skew the AFR at idle speeds which could in an engine that had varying compression ratio between cylinders, cause the engine to misfire and shake. Just spitballing here, not looking for a fight.
plumkrazee70
Well-Known Member
I understand and I appreciate it. I think the system relies on a map signal and with a dual plan it could throw it off. But I haven't had any issues with air fuel ratio so far so I think the spacer is doing what it needs to do..
trapster
Well-Known Member
If your engine was still together I would suggest trying it without the spacer and with more spacers to see if it made any difference in the running of the engine.
PS. I am also interested because I am adding a fitech to my 340, and I am hoping to avoid such issues. I have an airgap, a Torker and Torker 2, plus the original iron dual plane that barely fits under the hood with the carb.
plumkrazee70
Well-Known Member
The engine is not together, it's torn down to figure out where the glitter was coming from. I still have to take the crank and pistons out and check the mains.
All that being said. I researched the heck out of Fitech back in 2017, when I bought it. I feel like I avoided all the common mistakes with emi interference, grounding, replacing the faulty coolant sensor that comes with the unit, etc. So I already had the air gap and added a one inch open spacer. I've heard of guys also miling the center divider. There are a few threads on here if you search Fitech. One of them is a tuning thread that has a lot of great information. Also, Google and you will find another from a Chevelle forum. These are great because they were created when Fitech was fairly new.
All that being said, if I could do it over, I probably would've went with the Edelbrock PRO FLO 4 port injection. But just a matter of opinion. The Fitech so far has really been great. I do not believe the trouble I was having was in my tune, but time will tell.
sccachallenger
Well-Known Member
Sorry to read of your misery, thanks for all the documentation.
Wanted to ask if anyone has ever had a cam company replace one because of wiping a lobe, or lifter failure?
Please send your cam back to the mfg. THEY will measure it and tell you if its within spec.
This info will help all of us!
Wanted to ask if anyone has ever had a cam company replace one because of wiping a lobe, or lifter failure?
Please send your cam back to the mfg. THEY will measure it and tell you if its within spec.
This info will help all of us!
TT5.9mag
Two atmospheres are better than one
I have. A hydraulic roller from comp. The surface hardening was inadequate after being tested. I sent it to them, they tested it, and sent me a new one.
512Stroker
We are all here because we are not all there.
I dont send them back, my wife likes to use them for tomato stakes. LOL
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plumkrazee70
Well-Known Member
I wouldn't mind sending this one back, just out of pure curiosity.
Thanks for sticking with me on this. More to come in this week, when I get the pistons and crank out.
Thanks for sticking with me on this. More to come in this week, when I get the pistons and crank out.
plumkrazee70
Well-Known Member
It's all good. I'm just thankful, I have an understanding wife.
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